CN102676391A - Method and device for producing microalgae by byproducts CO2 and NH3 and waste water in chemical plant - Google Patents

Method and device for producing microalgae by byproducts CO2 and NH3 and waste water in chemical plant Download PDF

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CN102676391A
CN102676391A CN201210167773XA CN201210167773A CN102676391A CN 102676391 A CN102676391 A CN 102676391A CN 201210167773X A CN201210167773X A CN 201210167773XA CN 201210167773 A CN201210167773 A CN 201210167773A CN 102676391 A CN102676391 A CN 102676391A
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pond
algae
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filtrate
algae liquid
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CN102676391B (en
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耿萌
贾光伟
王军
高志辉
杜晓丹
陆峰
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China Tianchen Engineering Corp
Tianjin Tianchen Green Energy Resources Engineering Technology and Development Co Ltd
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Tianjin Tianchen Green Energy Resources Engineering Technology and Development Co Ltd
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Abstract

The invention provides a method and device for producing microalgae by byproducts CO2 and NH3 and waste water in a chemical plant. According to the method, the byproducts CO2 and NH3 and the emitted industrial waste water containing a large amount of NH3-N in the chemical plant are used as raw materials for producing the microalgae, the obtained microalgae can be used for producing biodiesel or used as animal feed, and the problem that a large number of greenhouse gases and the industrial waste water are emitted in a process of chemical production is solved at the same time. The invention also provides a device used for producing the microalgae. The method disclosed by the invention is suitable for cultivating the microalgae in a large scale and at a low cost, and compared with other harvesting methods, the three-level microalgae harvesting method has the advantages of large processing capacity, low investment and low consumption. The method and the device have good social and economic benefits.

Description

A kind of chemical plant by-product CO that utilizes 2, NH 3And waste water is produced method and the device of little algae
Technical field
The present invention relates to little algae industrialized aquaculture field, relate in particular to a kind of chemical plant by-product CO that utilizes 2, NH 3And waste water is produced method and the device of little algae.
Background technology
The development in society and economy need consume a large amount of fossil energies, and the use of fossil energy often brings a large amount of pollutents and CO 2Discharging.Produce in the process of various Chemicals in fossil energies such as human use's coal, oil, Sweet natural gases, supervened a large amount of CO 2And contain NH 3The industrial wastewater discharge that-N is higher.A large amount of CO of discharging 2To cause global warming and ecotope will be impacted; The trade effluent of discharging causes the eutrophication at water source, usually causes great environmental disaster to take place.
Little algae is a kind of tiny organism, also is that growth and breeding is fastest in the world, utilizes the most effectively plant of photosynthesis absorbing carbon dioxide.They can effectively utilize sunlight, and water and carbonic acid gas are converted into glucide and grease, and the frond that the solid carbon of little algae produces can be used to produce food, chemical products and biomass energy.In addition, little algae is nutritive ingredients such as the nitrogen in the graywater, phosphorus in light autotrophy culturing process, thereby reduce the eutrophication of water body, play the purpose that purifies factory's waste discharge.
Present both culturing microalgae method all can't reach the requirement that large-scale industrialization is cultured.Patent CN101555455 provides culture/harvesting method and the system of a kind of little algae, it can effectively improve little algae when cultivating to CO 2Utilization ratio, improve little algae output, when microalgae harvesting, reduced results step and the cost of little algae, but the biological photosynthetic reactor production efficiency that its adopts is lower, can't accomplish large-scale continuous production, and utilize CO 2The time, still be to adopt directly to feed CO 2Bubble supplies the method for micro algae growth, CO 2Bubble is difficult for diffusing in the water, and major part can't be absorbed and promptly diffuse to atmosphere, so CO 2Utilization ratio is still not ideal enough, and the microalgae harvesting method of its employing need add NaOH solution in addition, and the scope of application is narrower, only is applicable to part kind algae.And in the prior art, other of little algae are mainly gathered in the crops technology, also have problems like centrifuging, filtration method, flocculence: the centrifuging production cost is high, and industrial scale is little, can't be suitable for large-scale commercial prodn; Filtration method easy blocking filtering net, labor intensity of operating staff is big, can't continuous and stable production; Flocculence need use flocculation agent, possibly produce little algae to destroy, and in the following process process, also will isolate flocculation agent, and flow process is complicated.
Summary of the invention
The chemical plant especially is the chemical plant of raw material with the coal, produces great deal of high concentration CO at refining plant 2Gas is not as being used directly discharging atmosphere.Partial devices such as coal gasification apparatus, ammonia synthesizer will generate ammoniacal liquor, after concentrating, produce the ammoniacal liquor of the about 10-15% of concentration, except that the discharging flue gas desulfurization that is used for boiler is handled, also not have too many purposes.Simultaneously full factory produces and contains NH in a large number 3The trade effluent that-N is higher, NH in the water 3-N concentration is 300-800mg/l, and the pH value is 8-10, is discharged into the eutrophication that will cause the water source in the middle of the environment.
The problem that the present invention will solve provides a kind of method and device that utilizes chemical plant by-product CO2, NH3 and waste water to produce little algae, and this method is utilized the CO of chemical plant by-product 2, NH 3Reach the NH that contains of discharging 3The higher trade effluent of-N is as the little algae of raw material production; Solve the suitability for industrialized production technology of both culturing microalgae, improve and culture efficient, reduce aquaculture cost; Realize the industrialization of little algae bioenergy; Obtain that little algae can be used for the production biofuel or as animal-feed, solved the emission problem of a large amount of greenhouse gases and trade effluent in the chemical process simultaneously, economic benefit is good.
In addition, the present invention also provides a kind of microalgae harvesting method, compares with other harvesting approaches that to have processing power big, and low advantage is supported, consumed in investment.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of large-scale continuous little algae working method comprises the steps:
(1) in culturing the pond, adds little algae and the required nutrient solution of little algae; Said nutrient solution is made by following method: at NH 3In the sub product ammoniacal liquor that-N concentration is 300-800mg/L, pH value for the trade effluent of 8-10 and chemical plant, feed the industrial gaseous waste that is rich in carbonic acid gas and obtain NH 4HCO 3Solution is with this NH 4HCO 3Solution is main raw material, adds plant growth promoter and other required nutritive ingredients of selected micro algae growth, is mixed with nutrient solution required in the micro algae growth process;
(2) nutrient solution that contains little algae is realized the continuous operation that little algae produces culturing the pond, filtering between saturated pond and the filtrate tanks and circulate;
(3) in filtering saturated pond, add NH 3-N concentration is that 300-800mg/L, pH value are for the trade effluent of 8-10 and the sub product ammoniacal liquor in chemical plant, as the moisturizing of little algae production process;
The bottom in the saturated pond of said filtration is provided with some strainer tubes, and strainer tube outer wall filter pore aperture is 0.01-1mm;
Said strainer tube is divided into two groups at least, two groups of hocket filtration and logical CO 2Gas-operated;
The pH value exceeds the growth pH scope of little algae when algae liquid enters into the saturated pond of filtration, and the industrial gaseous waste that is rich in carbonic acid gas is passed into through strainer tube and filters in the saturated pond, and the pH value of algae liquid is reduced to the pH value scope of little algae suitable growth;
When filtering, the little algae of prematurity of filtering in the saturated pond follows the algae flow to go into filtrate tanks, and ripe little algae can't be stayed through filter pore and filtered in the saturated pond, and algae liquid is concentrated.
Preferably, strainer tube filters algae liquid and logical CO 2Operate alternately control automatically by the PLC system;
(4) in the algae liquid of filtrate tanks, replenish the necessary nutriment of the micro algae growth that consumes before this, culture the pond by delivering to after the filtrate pump pressurization then;
(5) the little concentration of algae in filtering saturated pond reaches and gathers in the crops when requiring, and stops algae liquid and gets into the saturated pond of filtration, makes strainer tube all carry out filter operation simultaneously; Initial filtrating relies on gravity to get into filtrate tanks; Filter saturated pit level and descend when slow when observing; Filtrate tanks is vacuumized; When flow of filtrate meter flow set on the entrance pipe of filtrate tanks is reduced to set(ting)value, stop to vacuumize, filter this moment and send outside after concentrated algae liquid in the saturated pond is pressurizeed by concentrated algae liquid pump.
The present invention feeds CO in trade effluent, by-product ammoniacal liquor 2Gas makes the NH in the trade effluent 3With CO 2Reaction forms NH 4HCO 3Solution adds plant growth promoter, K simultaneously 3The necessary nutritive element of micro algae growths such as PO4 is mixed with nutrient solution.Use this nutrient solution cultivating microalgae, consume CO along with little algae constantly carries out photosynthesis 2, the NH in the nutrient solution 4HCO 3Constantly decompose and discharge CO 2, keep CO higher in the nutrient solution 2Concentration.NH 4HCO 3Constantly be converted into (NH 4) 2CO 3, the pH value of nutrient solution raises gradually and no longer is fit to algal grown, and return nutrient solution to more logical CO this moment 2Gas makes (NH 4) 2CO 3Be converted into NH 4HCO 3, treat to continue cultivation of algae after the pH value reduces.Main chemical reactions is following:
Figure BDA00001686961100021
NH in the trade effluent 3Improved the CO in the nutrient solution greatly 2Content has promoted little algae to CO 2The absorption of gas.Working method was direct feeding CO in the past 2Bubble supplies micro algae growth, CO 2Bubble is difficult for diffusing in the water, and major part can't be absorbed and promptly diffuse to atmosphere, so CO 2Utilization ratio is lower.CO of the present invention 2Be present in the water with ionic species, stable in properties utilizes chemical equilibrium reaction for micro algae growth CO to be provided 2, be easy to absorbed by little algae, therefore improved CO greatly 2Utilising efficiency.
Breed pond among the present invention is the breed pond of pond formula breed pond, racing track formula breed pond or other type, and in culturing the pond, little algae relies on the NH in the nutrient solution 3, CO 2And other nutritive substance is constantly grown, is bred through photosynthesis.For realizing industrialized aquaculture, preferentially select the racing track formula to culture the pond, culturing the pond width is 1.5-2.8 rice; Length is 80-200 rice; The breed pond is arranged in parallel, and 80-150 constitutes one group, and every group links together with the overflow canal; Be provided with gate in the overflow canal, can be through the harvest time in gate open and close control different breeding pond.
Preferably; For improving the intensity of illumination of culturing little algae in the pond, little algae is evenly exposed to sunlight, the present invention is provided with turbulent baffle in culturing the pond; Make nutrient solution constantly disturbance up and down in the process of flowing in culturing the pond, make little algae of culturing the pond bottom also can float on top layer and expose to sunlight.Every group of turbulent baffle is made up of a following breach interceptor and a last breach interceptor, and distance between plates is a 0.3-0.5 rice, and every separated 5-10 rice is provided with one group of turbulent baffle.
Preferably, for reducing the ash oontent in little algae product, also be provided with settling pit between saturated pond culturing the pond and filter, the nutrient solution (algae liquid) that contains little algae circulates culturing between pond, settling pit, the saturated pond of filtration and the filtrate tanks.
The algae liquid of culturing in the pond relies on flow by gravity to get into settling pit along the overflow canal.The overflow canal is for connecting one group of irrigation canals and ditches of culturing between pond and the settling pit, and width is a 0.5-1 rice.The settling pit width is a 3-5 rice, and length is 4-6 rice, and the silt that carries in the nutrient solution will rely on gravity settling to fall the settling pit bottom, can reduce the ash oontent in little algae product., silt utilize the repair time to clear up after running up to certain depth.Algae liquid in the settling pit can overflow to filtering in the saturated pond, at riser filter screen is set, filter foreign material such as buoyant fallen leaves, weeds, plastics bag in the algae liquid.Riser is provided with 2-3, and is subsequent use each other, after a filter screen stops up, uses subsequent use riser.Culture the pond for closed, settling pit can omit among the present invention.
Preferably, the width in the saturated pond of said filtration is a 8-15 rice, and length is 30-50 rice, and some strainer tubes of bottom parallel laid, caliber are DN25～DN100.
Strainer tube of the present invention can be stainless steel tube, plastic cement pipe, pvc pipe etc., and strainer tube outer wall filter pore aperture is 0.01-1mm, according to the strainer tube in the different apertures of cultivating microalgae kind different choice.But strainer tube can be laid also paved in multi-layers by individual layer, and the algae liquid measure of handling is as required calculated the strainer tube radical.The present invention uses strainer tube to substitute filter cloth, has solved the insufficient problem of large-scale farming filtration area, can satisfy the requirement of filtration area through the radical that increases strainer tube.
Strainer tube is connected to two persons in charge successively separately, is responsible for alternately through filtrating and CO for two 2Gas is accomplished strainer tube and is filtered algae liquid and logical CO 2Gas reduces the process of algae liquid pH value.The said person in charge is branched off into two arms, and wherein an arm is provided with valve, and this arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively; Be provided with valve on another arm equally, this arm is connected with filtrate tanks through the flow of filtrate meter, and all valves and flow of filtrate meter all are electrically connected with said PLC system.
Specifically, a person in charge is branched off into two arms, and wherein an arm is provided with the V1 valve, and this arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively, and another arm is provided with the V3 valve, is connected with the flow of filtrate meter.Another is responsible for and is branched off into two arms equally; Wherein an arm is provided with the V2 valve; This arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively; Another arm is provided with the V4 valve, is connected with the flow of filtrate meter, and said V1 valve, V2 valve, V3 valve and V4 valve, flow of filtrate meter all are electrically connected with said PLC system.
Strainer tube of the present invention filters algae liquid and logical CO 2The alternation procedure that gas reduces algae liquid pH value is an automatic control process, the unlatching through PLC programming Control valve V1, V2, V3, V4, closes, and the switching of process is adjusted according to flow of filtrate meter flow or running time automatically.
Preferably, said strainer tube also is provided with the automatic back blow operation, and the switching of process is adjusted according to flow of filtrate meter flow or running time by the PLC system automatically; When dioxide gas can't be to the complete blowback of filter pore on the strainer tube, dioxide gas is switched to pressurized air, feed in the strainer tube.
Because it is higher to get into the algae liquid pH value of filtering in the saturated pond, has been not suitable for the algae continued growth, feed CO this moment 2Gas is to reduce the pH value of algae liquid, and specific operation process is: Open valve V4, V1, valve-off V2, V3 feed CO in a person in charge 2Gas, CO 2Gas is emerged from the filter pore of strainer tube, mainly accomplishes three purposes: the first, and logical CO 2Gas makes (NH 4) 2CO 3Be converted into NH 4HCO 3, make the pH value be reduced to appropriate value; The second, logical CO 2Gas can carry out blowback to filter pore, the dust granule that is blocked in filter pore is blown out, for next step filter operation is got ready; The 3rd, utilize CO 2The adsorption of bubble surface makes little algae in the algae liquid be attracted to the steam bubble surface and rises with steam bubble, reduces the little algae content of bottom algae liquid, is beneficial to and carries out filter operation.Meanwhile; In another root was responsible for, algae liquid utilized liquid level pressure reduction to flow in the filtrate tanks through valve V4, and liquid level difference is pressed into the strainer tube micropore with filtrating; Ripe little algae that volume is bigger can't be left on through filter pore filters in the saturated pond, does not also have the NH of sophisticated little algae and generation 4HCO 3To get into filtrate tanks and finally return the breed pond.In the filtration procedure; Dust granule in the algae liquid will constantly stop up filter pore, and flow of filtrate reduces gradually, when the flow that gets when the flow of filtrate instrumentation is reduced to set(ting)value; Two persons in charge are carried out blocked operation: valve-off V4, V1; Open valve V2, V3 use the strainer tube through the blowback operation to filter, and the strainer tube that stops up are to some extent carried out blowback.
More than two steps hocket, realized that the continous-stable of algae liquid filters, and made algae liquid pH value be reduced to appropriate value.After after a while, the resistance drop of strainer tube will increase to some extent, mainly be because CO 2Gaseous tension is lower, can't accomplish the complete blowback to filter pore, still has part to stop up, and switches the higher pressurized air of pressure this moment, can blow down the remaining dust that stops up filter pore clean.
Contain little algae of prematurity and NH among the present invention 4HCO 3Filtrating rely on action of gravity to get into filtrate tanks; Filtrate tanks is used for cushioning the fluctuation that the strainer tube handoff procedure is filtrated; Filtering in the saturated pond the little algae of prematurity returns with filtrating and cultures the pond and carry out the photosynthesis continued growth; Ripe little algae is filtered in the saturated pond because of being left on through filter pore, has therefore played the dense effect of proposing of algae liquid.
After little concentration of algae reaches the results requirement, carry out the vacuum filtration operation.Close the gate in the overflow canal, make algae liquid stop to get into and filter in the saturated pond, valve-off V1, V2 open valve V3, V4, make all strainer tubes carry out filter operation, and filtrating is delivered to after the filtrate pump pressurization and cultured the pond.Liquid level descends when slow in the saturated pond to be filtered, only relies on liquid level difference can not continue to filter, and this moment, the open vacuum pump vacuumized filtrate tanks, utilizes barometric point that the algae liquid that filters in the saturated pond is continued to filter.Keep the certain vacuum tightness of filtrate tanks, when flow of filtrate meter flow is reduced to set(ting)value, close vacuum pump.At this moment, algae liquid concentration is higher, can be used as product and has sent outside.
Preferably, when concentrated algae liquid need be processed the algae grain, use vacuum filter to carry out final filtration.Open and concentrate algae liquid pump and vacuum filter, the concentrated algae liquid that concentrated algae liquid pump will filter in the saturated pond is delivered to vacuum filter, obtains algae mud through vacuum filtration, and filtrating is from flowing into filtrate tanks.Can make the algae grain after sun lights solarization of algae mud process or the drying machine drying.
Preferably, filter the inclination that has 5 ° at the bottom of the pond, saturated pond, and at tilt 5 ° intercepting gutter of low spot design, guarantee that whole algae fluid powers are enough to send outside through concentrating the algae liquid pump.
Little algae among the present invention can be various algae, can be through the NH in the control nutrient solution 3-N content is that algal grown provides suitable pH value.Algae can be green alga, blue-green algae, red algae, diatom etc., and the preferred higher algae of oleaginousness like chlorella, grape algae etc., is used for the production biofuel, has higher economic value.
The present invention also provides a kind of microalgae harvesting method, in being used for the saturated pond of filtration that holds algae liquid and cultivate the little algae of algae liquid, filtering system is set, and algae liquid flows to filtrate tanks through the filtering system filtrate filtered; When little concentration of algae in the algae liquid reaches results when requiring, at first rely on the liquid level difference of filtering algae liquid and filtrate tanks in the saturated pond, the most of moisture in the algae liquid is removed by filter; Through filtrate tanks is vacuumized, utilize pressure reduction that the algae liquid that filters in the saturated pond is continued to filter then, obtain concentrating algae liquid; With vacuum filter the concentrated algae liquid that filters in the saturated pond is further filtered at last, obtain algae mud, accomplish microalgae harvesting.
The present invention also provides a kind of both culturing microalgae device, comprises PLC system, the saturated pond of breed pond, settling pit, filtration, filtrate tanks and the filtrate pump that connect successively.
The saturated pond of said filtration is provided with the water pipe of the sub product ammoniacal liquor in trade effluent and chemical plant; The several strainer tubes of bottom parallel laid in the saturated pond of said filtration, caliber is DN25～DN100, strainer tube outer wall filter pore aperture is 0.01-1mm; Said strainer tube is divided into two groups, is connected to two persons in charge successively separately, and the said person in charge is branched off into two arms, and wherein an arm is provided with valve, and this arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively; Be provided with valve on another arm equally, this arm is connected with filtrate tanks through the flow of filtrate meter, and all valves and flow of filtrate meter all are electrically connected with said PLC system.
Said PLC system is used for the controlled filter pipe and filters algae liquid and feed CO 2Operate alternately;
The saturated pond of said filtration also is provided with and concentrates the algae liquid pump, and the opening for feed that concentrates the algae liquid pump is visited to filtering bottom, saturated pond;
Said filtrate tanks also is connected with vacuum pump, and filtrate tanks is connected with the breed pond through filtrate pump.
Preferably, also comprise vacuum filter, said vacuum filter links to each other with concentrated algae liquid pump.
Preferably, the width in the saturated pond of said filtration is a 8-15 rice, and length is 30-50 rice;
Preferably, have 5 ° inclination at the bottom of the pond, the saturated pond of said filtration, and at tilt 5 ° intercepting gutter of low spot design, the opening for feed that concentrates the algae liquid pump is located in the intercepting gutter.
Preferably, said breed pond is that the pond formula is cultured the pond or the racing track formula is cultured the pond; Preferred racing track formula is cultured the pond, and it is 1.5-2.8 rice that said racing track formula is cultured the pond width, and length is 80-200 rice; The breed pond is arranged in parallel, and 80-150 constitutes one group, and every group links together with the overflow canal; Said overflow canal is communicated with settling pit, is provided with gate in the overflow canal.
Preferably, said breed is provided with turbulent baffle in the pond, and every group of turbulent baffle is made up of a following breach spoiler and a last breach spoiler, and distance between plates is a 0.3-0.5 rice, whenever at a distance from 5-10 rice one group of turbulent baffle is set.
Preferably, said settling pit width is a 3-5 rice, and length is 4-6 rice, is provided with riser in the settling pit, and riser is provided with filter screen.
Little algae working method of the present invention is fit to large-scale continuous production, and its advantage is the following aspects:
1, raw material is chemical plant by-product product and waste discharge, and production cost is low.
2, the little algae of the present invention nutritive ingredients such as the nitrogen in the graywater, phosphorus in light autotrophy culturing process, thus the eutrophication of reduction water body plays the purpose that purifies factory's waste discharge.
3, the present invention is provided with turbulent baffle in culturing the pond, makes nutrient solution constantly disturbance up and down in the process of flowing in culturing the pond, makes little algae of culturing the pond bottom also can float on top layer and exposes to sunlight.
4, further, the present invention is provided with settling pit, can effectively reduce the ash content in the algae liquid for western dust storm larger area, and dust is to the obstruction of filter pore when reducing filter operation.
5, use strainer tube to substitute filter cloth, improved filtration capacity greatly.Strainer tube is provided with the automatic back blow operation, realizes continuous, the steady running of filter operation, reduces labor intensity of operating personnel.
6, microalgae harvesting method adopts the three-stage filtration harvesting approach, at first adopts gravity filtration that major part filtrating is removed, and does not need consumed energy; The one-level vacuum filtration utilizes the huge filtration area of strainer tube, and processing power consumes lower greatly; Secondary vacuum filter filtration treatment load significantly reduces, and better controlling moisture content obtains the higher algae mud of concentration.The three-stage filtration harvesting approach only need select have the strainer tube in suitable aperture according to algae size, compares with other harvesting approaches that to have processing power big, and low advantage is supported, consumed in investment.
Description of drawings
Fig. 1 is that the present invention utilizes chemical plant by-product CO 2, NH 3And waste water is produced the schematic flow sheet of little algae.
Fig. 2 is the plane arrangement structure synoptic diagram of microalgae producing equipment.
Fig. 3 filters saturated pool structure synoptic diagram.
Fig. 4 is that the racing track formula is cultured pond interceptor structural representation.
Among the figure:
1, culture pond 2, settling pit 3, filter saturated pond
4, filtrate tanks 5, filtrate pump 6, vacuum pump
7, concentrate algae liquid pump 8, vacuum filter 9, overflow canal
10, gate 11, filter screen 12, intercepting gutter
13, strainer tube 14, flow of filtrate meter 15, PLC system
16, V1 valve 17, V2 valve 18, V3 valve
19, V4 valve 20, V5 valve 21, V6 valve
22, descend breach interceptor 23, last breach interceptor
Embodiment
Embodiment 1
Like Fig. 1-shown in Figure 4, a kind of chemical plant by-product CO that utilizes 2, NH 3And waste water produces the cultivation apparatus of little algae, comprises culturing pond 1, settling pit 2, filtering saturated pond 3, filtrate tanks 4, filtrate pump 5, vacuum pump 6, vacuum filter 8, concentrate algae liquid pump 7 and PLC system 15; Culture pond 1, settling pit 2, filter saturated pond 3, filtrate tanks 4 is connected with filtrate pump 5 successively.
The nutrient solution that contains little algae circulates between breed pond 1, settling pit 2, the saturated pond 3 of filtration and filtrate tanks 4, realizes the continuous operation that little algae produces.
The opening for feed that concentrates algae liquid pump 7 is visited to filtering 3 bottoms, saturated pond, and said vacuum filter 8 links to each other with concentrated algae liquid pump 7;
The entrance pipe of said filtrate tanks 4 is provided with flow of filtrate meter 14, and flow of filtrate meter 14 is connected with PLC system 15;
Said filtrate tanks 4 links to each other with vacuum pump 6, and filtrate tanks 4 is connected with breed pond 1 through filtrate pump 5.
The pond is cultured for the racing track formula in said breed pond 1.
In culturing pond 1, add little algae and the required nutrient solution of little algae.Said nutrient solution is made by following method: at NH 3In the sub product ammoniacal liquor that-N concentration is 300-800mg/L, pH value for the trade effluent of 8-10 and chemical plant, feed the industrial gaseous waste that is rich in carbonic acid gas and obtain NH 4HCO 3Solution is with this NH 4HCO 3Solution is main raw material, adds plant growth promoter and other required nutritive ingredients of selected micro algae growth, is mixed with nutrient solution required in the micro algae growth process.The nutrient solution that contains little algae circulates culturing pond 1, settling pit 2 and filter between the saturated pond 3, realizes the continuous operation that little algae produces.
The saturated pond 3 of said filtration is provided with the water pipe of the sub product ammoniacal liquor in trade effluent and chemical plant.In filtering saturated pond 3, add trade effluent and by-product ammoniacal liquor, NH in the water 3-N concentration is 300-800mg/l, and the pH value is 8-10, as the moisturizing of little algae production process.Self-purification device and the CO that comes 2Gas, is passed into the form of bubbling through strainer tube 13 and filters in the saturated pond 3 CO to little algae production battery limit (BL) through pipe-line transportation 2In the process that rises, with alkaline nutrient solution reaction, absorbed by nutrient solution, the pH value is reduced to 6-7.
Filtering saturated pond 3 width is 10 meters, and length is 40 meters, 2 meters of the degree of depth, and 1000 strainer tubes 13 of bottom parallel laid, strainer tube 13 is the DN25 stainless steel tube, strainer tube 13 outer wall filter pore apertures are 0.01-0.5mm.
Strainer tube 13 is connected to two persons in charge successively separately, two groups is hocketed filter and logical CO 2Gas-operated.Wherein a person in charge is branched off into two arms, and wherein an arm is provided with V1 valve 16, and this arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively, and another arm is provided with V3 valve 18, is connected with flow of filtrate meter 14; Another is responsible for and is branched off into two arms equally; Wherein an arm is provided with V2 valve 17; This arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively; Another arm is provided with V4 valve 19, is connected with flow of filtrate meter 14, and said V1 valve 16, V2 valve 17, V3 valve 18 and V4 valve 19, flow of filtrate meter 14 all are electrically connected with said PLC system 15.
Strainer tube 13 filters algae liquid and logical CO 2Operate alternately control automatically by PLC system 15.Unlatching through PLC programming Control V1 valve 16, V2 valve 17, V3 valve 18, V4 valve 19, close, the switching of process is adjusted according to flow of filtrate meter 14 flows automatically.When one group of strainer tube 13 led to the CO2 gas-operated, another group was carried out filter operation.During filter operation, ripe little algae can't pass filter pore and stay and filter in the saturated pond 3, has played the effect that increases little concentration of algae.More than two steps hocket, realized that the continous-stable of algae liquid filters, and made algae liquid pH value be reduced to appropriate value.
In the filtration procedure, the dust granule in the algae liquid will constantly stop up filter pore, and flow of filtrate reduces gradually; The flow that records when flow of filtrate meter 14 is reduced to set(ting)value; Be 80% o'clock of inceptive filtering flow, two persons in charge are carried out blocked operation: close V4 valve 19, V1 valve 16, open V2 valve 17, V3 valve 18; Use strainer tube 13 to filter, and the strainer tube 13 that stops up is to some extent carried out blowback through the blowback operation.After after a while, the resistance of strainer tube 13 will increase to some extent, mainly be because CO 2Gaseous tension is lower, can't accomplish the complete blowback to filter pore, still has part to stop up, and switches the higher pressurized air of pressure this moment, can blow down the remaining dust that stops up filter pore clean.Carbon dioxide pipeline and the switching of compressed air inlet pipe road are controlled through V5 valve 20 that is arranged on the carbon dioxide pipeline and the V6 valve 21 that is arranged on the compressed air inlet pipe road by the PLC programming.
Contain little algae of prematurity and NH 4HCO 3Filtrating rely on action of gravity to get into filtrate tanks 4; In the filtrate tanks 4; Replenish the necessary nutriment of the micro algae growth that consumes before this,, be mixed with the required nutrient solution of micro algae growth like needed nutritive mediums of micro algae growth such as nitrogenous fertilizer, phosphate fertilizer, potash fertilizer; Nutrient solution is delivered to after filtrate pump 5 pressurizations and is cultured in the pond 1, and the little algae of prematurity carries out the photosynthesis continued growth in culturing pond 1.
Each cultures pond 1 width is 2 meters, and length is 200 meters, and the degree of depth is 0.5 meter, cultures pond 1 and is arranged in parallel, and 120 constitute one group, and every group links together with overflow canal 9, flows in the canal to be provided with gate 10.In culturing pond 1, turbulent baffle is set, every group of turbulent baffle is made up of a following breach interceptor 22 and a last breach interceptor 23, and distance between plates is 0.3 meter, whenever at a distance from 6 meters one group of turbulent baffle is set.Nutrient solution in the process of flowing, receives constantly disturbance up and down of interceptor effect in culturing pond 1, make little algae of culturing pond 1 bottom also can float on top layer and expose to sunlight.
Along with constantly carrying out photosynthesis, little algae consumes CO 2, the NH in the nutrient solution 4HCO 3Constantly decompose and discharge CO 2, keep CO higher in the nutrient solution 2Concentration.NH 4HCO 3Constantly be converted into (NH 4) 2CO 3, the pH value of nutrient solution raises gradually and no longer is fit to algal grown, leaves the algae liquid pH value rising of culturing pond 1 and is 8-9, relies on flow by gravities to get into settling pit 2 along overflow canal 9, and overflow canal 9 width are 0.5 meter, and the degree of depth is 0.2 meter.Settling pit 2 width are 5 meters, and length is 6 meters, and the silt that carries in the nutrient solution relies on gravity settling to fall settling pit 2 bottoms.Algae hydrorrhea in the settling pit 2 flow to and filters in the saturated pond 3, at riser filter screen 11 is set, and filters foreign material such as buoyant fallen leaves, weeds, plastics bag in the algae liquid, and filter screen 11 is the 40-60 order.Riser is provided with 2-3, and is subsequent use each other, after a filter screen 11 stops up, uses subsequent use riser.
, the algae hydrorrhea just forms the recycle system of a cultivating microalgae after flowing to the saturated pond 3 of filtration.Filter in the saturated pond 3 the little algae of prematurity and return with filtrating and culture pond 1, ripe little algae is filtered in the saturated pond 3 because of being left on through filter pore, so has played the dense effect of proposing of algae liquid.After 24-48 hour, little concentration of algae reaches the results requirement, carries out filter operation.Close the gate 10 in the overflow canal 9, make algae liquid stop to get into and filter in the saturated pond 3, close V1 valve 16, V2 valve 17, open V3 valve 18, V4 valve 19, make all strainer tubes 13 carry out filter operation, filtrating is delivered to after filtrate pump 5 pressurizations and is cultured pond 1.Liquid level descends when slow in the saturated pond 3 to be filtered, and 6 pairs of filtrate tanks 4 of open vacuum pump vacuumize, and utilizes barometric point that the algae liquid that filters in the saturated pond 3 is continued to filter.The vacuum tightness of keeping filtrate tanks 4 is 50-60kPa, when flow of filtrate meter 14 flows are reduced to 5m 3Close vacuum pump 6 during/h.At this moment, algae liquid concentration is higher, uses to concentrate and sends outside as product after algae liquid pump 7 pressurizes.
Embodiment 2
Both culturing microalgae and algae liquid concentration process are identical with embodiment 1.Process the algae granule product if desired, open and concentrate algae liquid pump 7 and vacuum filter 8, the concentrated algae liquid that concentrated algae liquid pump 7 will filter in the saturated pond 3 is delivered to vacuum filter 8, filters through vacuum filter 8 and obtains the algae mud, and filtrating is from flowing into filtrate tanks 4.Can make the algae grain after sun lights solarization of algae mud process or the drying machine drying.Filter the inclination that has 5 ° at the bottom of 3 ponds, saturated pond, and at tilt 5 ° intercepting gutter 12 of low spot design, the opening for feed that concentrates algae liquid pump 7 is located in the intercepting gutter 12, is guaranteed that whole algae liquid deliver to vacuum filter 8 and filter through concentrating algae liquid pump 7.
More than preferred embodiment of the present invention is specified, but said content is merely preferred embodiment of the present invention, can not be considered to be used to limit practical range of the present invention.All equalizations of doing according to application range of the present invention change and improve etc., all should still belong within the patent covering scope of the present invention.

Claims (9)

1. large-scale continuous little algae working method is characterized in that:
(1) in culturing the pond, adds little algae and the required nutrient solution of little algae; Said nutrient solution is made by following method: at NH 3In the sub product ammoniacal liquor that-N concentration is 300-800mgL, pH value for the trade effluent of 8-10 and chemical plant, feed the industrial gaseous waste that is rich in carbonic acid gas and obtain NH 4HCO 3Solution is with this NH 4HCO 3Solution is main raw material, adds plant growth promoter and other required nutritive ingredients of selected micro algae growth, is mixed with nutrient solution required in the micro algae growth process;
(2) nutrient solution that contains little algae is realized the continuous operation that little algae produces culturing the pond, filtering between saturated pond and the filtrate tanks and circulate;
(3) in filtering saturated pond, add NH 3-N concentration is that 300-800mgL, pH value are for the trade effluent of 8-10 and the sub product ammoniacal liquor in chemical plant, as the moisturizing of little algae production process;
The bottom in the saturated pond of said filtration is provided with some strainer tubes, and strainer tube outer wall filter pore aperture is 0.01-1mm;
Said strainer tube is divided into two groups at least, two groups of hocket filtration and logical CO 2Gas-operated;
The pH value exceeds the growth pH scope of little algae when algae liquid enters into the saturated pond of filtration, and the industrial gaseous waste that is rich in carbonic acid gas is passed into through strainer tube and filters in the saturated pond, and the pH value of algae liquid is reduced to the pH value scope of little algae suitable growth;
When filtering, the little algae of prematurity of filtering in the saturated pond follows the algae flow to go into filtrate tanks, and ripe little algae can't be stayed through filter pore and filtered in the saturated pond, and algae liquid is concentrated;
Preferably, strainer tube filters algae liquid and logical CO 2Operate alternately control automatically by the PLC system;
Preferably, said strainer tube also is provided with the automatic back blow operation, and the switching of process is adjusted according to flow of filtrate meter flow or running time by the PLC system automatically; When dioxide gas can't be to the complete blowback of filter pore on the strainer tube, dioxide gas is switched to pressurized air, feed in the strainer tube;
Preferably, the width in the saturated pond of said filtration is a 8-15 rice, and length is 30-50 rice, and some strainer tubes of bottom parallel laid, caliber are DN25～DN100;
Preferably, have 5 ° inclination at the bottom of the pond, the saturated pond of said filtration, and at tilt 5 ° intercepting gutter of low spot design, guarantee all to concentrate that the algae fluid powers are enough sends outside through concentrating the algae liquid pumps;
(4) in the algae liquid of filtrate tanks, replenish the necessary nutriment of the micro algae growth that consumes before this, culture the pond by delivering to after the filtrate pump pressurization then;
(5) the little concentration of algae in filtering saturated pond reaches and gathers in the crops when requiring, and stops algae liquid and gets into the saturated pond of filtration, makes strainer tube all carry out filter operation simultaneously; Initial filtrating relies on gravity to get into filtrate tanks; Filter saturated pit level and descend when slow when observing; Filtrate tanks is vacuumized; When flow of filtrate meter flow set on the entrance pipe of filtrate tanks is reduced to set(ting)value, stop to vacuumize, filter this moment and send outside after concentrated algae liquid in the saturated pond is pressurizeed by concentrated algae liquid pump.
2. method according to claim 1 is characterized in that: said breed pond is that the pond formula is cultured the pond or the racing track formula is cultured the pond; The preferential racing track formula of selecting is cultured the pond, and it is 1.5-2.8 rice that said racing track formula is cultured the pond width, and length is 80-200 rice, and culture the pond and be arranged in parallel, one group of 80-150 formation, every group links together with the overflow canal, is provided with gate in the overflow canal; Said overflow canal is communicated with settling pit; Preferred, said breed is provided with turbulent baffle in the pond, and every group of turbulent baffle is made up of a following breach interceptor and a last breach interceptor, and distance between plates is a 0.3-0.5 rice, and every separated 5-10 rice is provided with one group of turbulent baffle.
3. method according to claim 1 and 2; It is characterized in that: also be provided with settling pit between saturated pond culturing the pond and filter; The nutrient solution that contains little algae circulates between breed pond, settling pit, the saturated pond of filtration and filtrate tanks; The algae liquid of culturing in the pond flows into earlier in the settling pit, remove the silt that carries in the algae liquid through settling pit after, algae liquid flows into and filters saturated pond; Preferably, said settling pit width is a 3-5 rice, and length is 4-6 rice, is provided with riser in the settling pit, and riser is provided with filter screen, and algae liquid filters saturated pond through flowing into behind the strainer filtering.
4. according to each described method of claim 1-3; It is characterized in that: when concentrated algae liquid need be processed the algae grain, concentrate algae liquid and delivered in the vacuum filter, obtain algae mud through vacuum filtration through concentrating the algae liquid pump; Filtrating is flowed back to filtrate tanks, and algae mud prepares the algae grain through super-dry.
5. according to each described method of claim 1-4, it is characterized in that: said microalgae is green alga, blue-green algae, red algae or diatom, the preferred higher algae of oleaginousness, more preferably chlorella or grape algae.
6. microalgae harvesting method is characterized in that: in being used for the saturated pond of filtration that holds algae liquid and cultivate the little algae of algae liquid, filtering system is set, algae liquid flows to filtrate tanks through the filtering system filtrate filtered; When little concentration of algae in the algae liquid reaches results when requiring, at first rely on the liquid level difference of filtering algae liquid and filtrate tanks in the saturated pond, the most of moisture in the algae liquid is removed by filter; Through filtrate tanks is vacuumized, utilize pressure reduction that the algae liquid that filters in the saturated pond is continued to filter then, obtain concentrating algae liquid; With vacuum filter the concentrated algae liquid that filters in the saturated pond is further filtered at last, obtain algae mud, accomplish microalgae harvesting.
7. a both culturing microalgae device is characterized in that: comprise PLC system, the saturated pond of breed pond, settling pit, filtration, filtrate tanks and the filtrate pump that connect successively;
The saturated pond of said filtration is provided with the water pipe of the sub product ammoniacal liquor in trade effluent and chemical plant; The several strainer tubes of bottom parallel laid in the saturated pond of said filtration, caliber is DN25～DN100, strainer tube outer wall filter pore aperture is 0.01-1mm; Said strainer tube is divided into two groups, is connected to two persons in charge successively separately, and the said person in charge is branched off into two arms, and wherein an arm is provided with valve, and this arm is connected with the compressed air inlet pipe road with the carbon dioxide pipeline respectively; Be provided with valve on another arm equally, this arm is connected with filtrate tanks through the flow of filtrate meter, and all valves and flow of filtrate meter all are electrically connected with said PLC system;
The saturated pond of said filtration also is provided with and concentrates the algae liquid pump, and the opening for feed that concentrates the algae liquid pump is visited to filtering bottom, saturated pond;
Said filtrate tanks also is connected with vacuum pump, and filtrate tanks is connected with the breed pond through filtrate pump;
Preferably, also comprise vacuum filter, said vacuum filter links to each other with concentrated algae liquid pump;
Preferably, the width in the saturated pond of said filtration is a 8-15 rice, and length is 30-50 rice;
Preferably, have 5 ° inclination at the bottom of the pond, the saturated pond of said filtration, and at tilt 5 ° intercepting gutter of low spot design, the opening for feed that concentrates the algae liquid pump is located in the intercepting gutter.
8. both culturing microalgae device according to claim 7 is characterized in that: said breed pond is that the pond formula is cultured the pond or the racing track formula is cultured the pond; Preferred racing track formula is cultured the pond, and it is 1.5-2.8 rice that said racing track formula is cultured the pond width, and length is 80-200 rice; The breed pond is arranged in parallel, and 80-150 constitutes one group, and every group links together with the overflow canal; Said overflow canal is communicated with settling pit, is provided with gate in the overflow canal;
Preferably, said breed is provided with turbulent baffle in the pond, and every group of turbulent baffle is made up of a following breach spoiler and a last breach spoiler, and distance between plates is a 0.3-0.5 rice, whenever at a distance from 5-10 rice one group of turbulent baffle is set.
9. according to claim 7 or 8 described both culturing microalgae devices, it is characterized in that: said settling pit width is a 3-5 rice, and length is 4-6 rice, is provided with riser in the settling pit, and riser is provided with filter screen.
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CN102952747A (en) * 2012-12-10 2013-03-06 武汉环天禹生物环保科技有限公司 Carbon fiber microalgae cultivating system using wastewater resources
CN104524964A (en) * 2014-12-18 2015-04-22 中国科学院广州能源研究所 Device and method for cleaning carbon dioxide in industrial waste gas via microalgae
CN109337820A (en) * 2018-12-10 2019-02-15 中国石油化工股份有限公司 The method of continuous production microalgae
CN109456895A (en) * 2018-10-23 2019-03-12 天津大学 A kind of CO that chemical absorbing is coupled with bioconversion2Capture method
CN109467192A (en) * 2018-12-10 2019-03-15 中国石油化工股份有限公司 Nitric acid waste produces the processing method that waste water is cleaned in microalgae
CN109467191A (en) * 2018-12-10 2019-03-15 中国石油化工股份有限公司 The method for handling high nitre waste water using microalgae
CN109609383A (en) * 2018-12-11 2019-04-12 天津大学 Regulate and control and utilize NH based on pH4HCO3The microalgae culture method of absorbing liquid
CN111607443A (en) * 2020-05-22 2020-09-01 广东石油化工学院 Solidifying and adsorbing CO by using microalgae2Biogas purification method

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CN101654313A (en) * 2009-09-15 2010-02-24 哈尔滨工业大学水资源国家工程研究中心有限公司 Method for utilizing advanced oxidation for carrying out pretreatment on sewage and culturing engineering microalgae for carrying out sewage deep treatment and carbon dioxide emission reduction

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CN101555455A (en) * 2009-05-22 2009-10-14 新奥科技发展有限公司 Culture/harvesting method of microalgae and system
CN101654313A (en) * 2009-09-15 2010-02-24 哈尔滨工业大学水资源国家工程研究中心有限公司 Method for utilizing advanced oxidation for carrying out pretreatment on sewage and culturing engineering microalgae for carrying out sewage deep treatment and carbon dioxide emission reduction

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Publication number Priority date Publication date Assignee Title
CN102952747A (en) * 2012-12-10 2013-03-06 武汉环天禹生物环保科技有限公司 Carbon fiber microalgae cultivating system using wastewater resources
CN102952747B (en) * 2012-12-10 2014-04-30 武汉环天禹生物环保科技有限公司 Carbon fiber microalgae cultivating system using wastewater resources
CN104524964A (en) * 2014-12-18 2015-04-22 中国科学院广州能源研究所 Device and method for cleaning carbon dioxide in industrial waste gas via microalgae
CN109456895A (en) * 2018-10-23 2019-03-12 天津大学 A kind of CO that chemical absorbing is coupled with bioconversion2Capture method
CN109337820A (en) * 2018-12-10 2019-02-15 中国石油化工股份有限公司 The method of continuous production microalgae
CN109467192A (en) * 2018-12-10 2019-03-15 中国石油化工股份有限公司 Nitric acid waste produces the processing method that waste water is cleaned in microalgae
CN109467191A (en) * 2018-12-10 2019-03-15 中国石油化工股份有限公司 The method for handling high nitre waste water using microalgae
CN109609383A (en) * 2018-12-11 2019-04-12 天津大学 Regulate and control and utilize NH based on pH4HCO3The microalgae culture method of absorbing liquid
CN111607443A (en) * 2020-05-22 2020-09-01 广东石油化工学院 Solidifying and adsorbing CO by using microalgae2Biogas purification method

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