CN111661990A - Biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation - Google Patents

Biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation Download PDF

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CN111661990A
CN111661990A CN202010393626.9A CN202010393626A CN111661990A CN 111661990 A CN111661990 A CN 111661990A CN 202010393626 A CN202010393626 A CN 202010393626A CN 111661990 A CN111661990 A CN 111661990A
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biogas
tank
biogas slurry
treatment device
anaerobic fermentation
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张冬青
牛晓君
黄续崟
郭华芳
唐志华
刘敏茹
张荔
李霞
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Guangdong University of Petrochemical Technology
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Guangdong University of Petrochemical Technology
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/02Biological treatment
    • C02F11/04Anaerobic treatment; Production of methane by such processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/008Sludge treatment by fixation or solidification
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/20Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/04Flow arrangements
    • C02F2301/043Treatment of partial or bypass streams

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  • Life Sciences & Earth Sciences (AREA)
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  • Water Supply & Treatment (AREA)
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Abstract

The invention provides a biogas slurry and biogas residue treatment device and method based on semi-dry anaerobic fermentation, the device comprises an anaerobic fermentation device, a biogas treatment device, a solid-liquid separation device, a biogas residue treatment device and a biogas slurry treatment device, the anaerobic fermentation device comprises a tank body, a stirring device, an overflow groove, a gas collecting pipe and an emptying valve, the biogas treatment device comprises a gas inlet, a condensing device, a liquid collecting groove, a desulfurization groove and a gas outlet, the solid-liquid separation device comprises an inclined plate feeding groove, a reflux pump and a double-helix extrusion groove, the biogas residue treatment device comprises a granulator and a dryer, the biogas slurry treatment device comprises a biogas slurry discharge pool nanofiltration membrane and a flushing pump, and the flushing pump is connected with a flushing device on a biogas collecting groove or a septic tank. In a word, the invention has the advantages of novel structure, perfect method, good biogas slurry and residue treatment effect, low system load and the like.

Description

Biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation
Technical Field
The invention belongs to the technical field of fecal sewage treatment, and particularly relates to a biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation.
Background
Biogas fermentation is also called anaerobic digestion and anaerobic fermentation, and refers to a process of finally forming combustible mixed gas such as methane, carbon dioxide and the like by decomposing and metabolizing organic substances such as human, livestock and poultry excrement, straws, weeds and the like under certain moisture, temperature and anaerobic conditions through various microorganisms. The biogas fermentation system is based on a biogas fermentation principle, aims at energy production, and finally realizes comprehensive utilization of biogas, biogas slurry and biogas residues.
Biogas fermentation is a complex biochemical process and has the following characteristics: (1) the microorganisms participating in the fermentation reaction are various, no precedent for producing methane by using a single strain exists, and the inoculum is required to be used for fermentation in the production and test processes. (2) The raw materials for fermentation are complex, the sources are wide, various single organic matters or mixtures can be used as the fermentation raw materials, and the final products are the biogas. In addition, organic wastewater with COD mass concentration over 50000mg/L and organic waste with high solid content can be treated by methane fermentation. (3) The energy consumption of the biogas microorganisms is low, and under the same condition, the energy required by anaerobic digestion only accounts for 1/30-1/20 of aerobic decomposition. (4) The biogas fermentation devices are various in types, and different in structure and material, but can produce biogas as long as the devices are reasonably designed. (5) Methanogens require life in environments below the redox potential-330 mV, and biogas fermentation requires to be carried out in a strict anaerobic environment.
The semi-dry anaerobic fermentation refers to an anaerobic fermentation process which is carried out when the solid content of a fermentation raw material is more than 20%, and the semi-dry anaerobic fermentation process has the following advantages: 1) the semi-dry fermentation tank has higher operating concentration than the wet fermentation tank, and the same volume of the fermentation tank can process more raw materials and generate more methane. 2) The method has the advantages of low economy, low heat and water addition required by a semi-dry process compared with wet anaerobic fermentation, suitability for northern alpine regions, long tank cleaning period, great reduction in consumption of manpower and material resources, and good economy.
Therefore, the invention designs a biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation.
Disclosure of Invention
Aiming at the problems, the invention provides a biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation.
The technical scheme of the invention is as follows: a biogas slurry and biogas residue treatment device based on semi-dry anaerobic fermentation mainly comprises an anaerobic fermentation device, a biogas treatment device, a solid-liquid separation device, a biogas residue treatment device and a biogas slurry treatment device,
the anaerobic fermentation device comprises a tank body for bearing livestock and poultry dung, a stirring device which is arranged in the tank body and is used for stirring materials in the tank body, an overflow groove which is arranged at the upper end in the tank body in a surrounding manner and is used for overflowing supernatant of the materials, a gas collecting pipe which is arranged at the top end of the tank body and is used for collecting biogas generated by anaerobic fermentation, and an emptying valve which is arranged at the bottom end of the tank body and is used for discharging fermentation products,
the biogas treatment device comprises an air inlet connected with the gas collecting pipe and used for collecting biogas, a condensing device arranged above the biogas treatment device and close to the side of the air inlet, a liquid collecting tank arranged below the condensing device and used for collecting condensed dripping liquid, a desulfurization tank arranged at the far end of the biogas treatment device and used for adsorbing hydrogen sulfide in the biogas and an air outlet arranged at the air outlet end of the desulfurization tank, wherein the air outlet is connected with a biogas collecting tank,
the solid-liquid separation device comprises an inclined plate feeding groove, a reflux pump, a double-screw extrusion groove, a slag hole and a liquid outlet, wherein the upper end of the inclined plate feeding groove is connected with the emptying valve, the reflux groove is arranged in the middle of the inclined plate feeding groove and is controlled by a motor to be switched on and off, the reflux pump is connected with the reflux groove and is used for supplementing anaerobic sludge to the tank body in a reflux manner, the double-screw extrusion groove is connected to the bottom end of the inclined plate feeding groove and is used for dehydrating fermentation products, and the,
the biogas residue treatment device comprises a granulator and a dryer, wherein the granulator is used for granulating the biogas residue and the dryer is used for drying and forming the granulated biogas residue, and the granulator and the dryer are sequentially connected with the residue outlet,
the biogas slurry treatment device comprises a biogas slurry discharge tank which is respectively connected with the overflow groove, the liquid collecting tank and the liquid outlet, wherein a nanofiltration membrane for filtering biogas slurry is arranged on the biogas slurry discharge tank, a flushing pump is also arranged in the biogas slurry discharge tank, and the flushing pump is respectively connected with a flushing device on the excrement collecting ditch or the excrement collecting tank and is used for flushing excrement attached to the excrement collecting ditch or the excrement collecting tank by using biogas slurry.
Furthermore, the tank body is externally covered with a heat-insulating layer, the heat-insulating layer can prevent heat generated by anaerobic fermentation in the anaerobic fermentation device from losing, the reaction efficiency is improved, the methane generation rate is increased, and the anaerobic fermentation of the livestock and poultry feces is more thorough.
Further, agitating unit is including setting up the agitator motor at jar body top, agitator motor's output shaft stretches into jar internal portion, be equipped with the stirring ring that is used for the internal material of agitator tank and the broken sediment thorn that is used for abolishing material supernatant caking dross, the stirring ring can make the internal material of jar and temperature more even, broken sediment thorn can be broken with the supernatant fluid supernatant showy marsh slag plate piece that the marsh slag condenses, avoids the marsh slag plate piece to cover and causes material gas production rate to reduce on the supernatant fluid.
Furthermore, a filter screen for filtering scum in overflow supernatant is arranged in the overflow groove, so that the scum is prevented from entering the biogas slurry treatment device to block the nanofiltration membrane.
Furthermore, the condensing device comprises a cooling compressor arranged above the methane processing device and a spiral condensing pipe arranged inside the methane processing device, two ends of the spiral condensing pipe are respectively connected with an input end and an output end of the cooling compressor, the cooling compressor circulates a coolant in the spiral condensing pipe, the steam in the methane is condensed by the circulated coolant, and the condensing effect is good and the continuity is long.
Furthermore, an iron oxide filling layer, a calcium oxide filling layer and an active carbon filling layer are sequentially arranged in the desulfurization tank according to the air inlet direction, the active carbon of the active carbon filling layer is alkali-impregnated active carbon, the filling layer can gradually adsorb hydrogen sulfide in the biogas, and the alkali-impregnated active carbon solves the problem of low adsorption efficiency of the active carbon for adsorbing the hydrogen sulfide.
Furthermore, the swash plate feed chute is provided with a vibration motor for shaking off the swash plate feed chute to hang biogas residues, the biogas residues with low water content can be adhered to the swash plate feed chute due to resistance when passing through the swash plate feed chute, the passing rate is low, the working efficiency of the solid-liquid separation device is influenced, and the vibration motor can accelerate the biogas residues to pass through the swash plate feed chute and prevent the biogas residues from being adhered to the swash plate feed chute.
Further, the double-helix extrusion tank comprises an upper dehydration tank connected with the bottom end of the inclined plate feeding tank and a lower dehydration tank connected with the discharge port of the upper dehydration tank,
an upper screw rod for extruding biogas residues for dehydration is arranged in the upper dehydration tank, the upper screw rod is driven by an upper motor at the side end of the upper dehydration tank, impellers I with gradually reduced intervals are arranged on the upper screw rod along the extrusion direction, an extrusion block I for extruding the biogas residues is arranged at the far end of the upper screw rod, an upper filter screen for filtering the biogas residues is arranged at the bottom of the upper dehydration tank,
a lower screw rod for extruding biogas residues extruded by the upper dehydration tank is arranged in the lower dehydration tank, the lower screw rod is driven by a lower motor at the side end of the lower dehydration tank, a second impeller with gradually reduced space is arranged on the lower screw rod along the extrusion direction, the far end of the lower screw rod is provided with a second extrusion block for extruding biogas residues, the bottom of the lower dehydration tank is provided with a lower filter screen for filtering the biogas residues, the density of the impeller II on the lower screw rod is greater than that of the impeller I on the upper screw rod, the lower parts of the upper dewatering tank and the lower dewatering tank are respectively provided with an upper liquid collecting tank and a lower liquid collecting tank which are used for collecting liquid obtained by filtering an upper filter screen and a lower filter screen, the upper liquid collecting tank and the lower liquid collecting tank are respectively connected with the liquid outlet through an upper liquid outlet and a lower liquid outlet which are arranged on the back side surface, the slag hole is arranged at the discharge hole of the lower dehydration tank, and the double-helix extrusion tank can ensure that the moisture in the biogas residues is fully extruded.
The method for treating biogas slurry and residue through semi-dry anaerobic fermentation by using the device mainly comprises the following steps:
s1: semi-dry anaerobic fermentation
Conveying livestock and poultry manure with TS (sulfur) more than 20% into an anaerobic fermentation device for anaerobic fermentation, wherein the material stays for 15-20d, periodically stirring the livestock and poultry manure by a stirring device in the anaerobic fermentation process, allowing supernatant of anaerobic fermentation products to flow into a biogas slurry treatment device through an overflow tank for further treatment, crushing scum caked on the surface of the supernatant by a slag-breaking thorn on an output shaft of the stirring device in the stirring process, preventing the caked scum from influencing the deflation of the fermentation products, intercepting the crushed scum by a filter screen in the overflow tank, emptying materials in a tank body by an emptying valve after the anaerobic fermentation is finished, allowing the discharged materials to enter a solid-liquid separation device for further treatment, and allowing biogas generated in the anaerobic fermentation process to enter a biogas treatment device for further treatment through a gas collecting pipe;
s2: biogas collection and treatment
The biogas mixed with biogas slurry steam enters the biogas treatment device through the air inlet and passes through the spiral condensing pipe of the condensing device, the mixed steam in the biogas is condensed into liquid under the action of a coolant in the spiral condensing pipe and falls into a liquid collecting tank, the dried biogas passes through the desulfurization tank and then is introduced into a biogas collecting tank for collection and standby, and the biogas slurry collected in the liquid collecting tank is transmitted to the biogas slurry treatment device for further treatment;
s3: biogas residue treatment
The material discharged from the tank body enters a double-helix extrusion tank through an inclined plate feeding tank for solid-liquid separation, a reflux pump can reflux a part of the material collected by the reflux tank into the tank body to supplement anaerobic activated sludge in an anaerobic fermentation device, the material entering the double-helix extrusion tank is firstly preliminarily extruded and dehydrated by an upper screw rod of an upper dehydration tank, the dehydrated material enters a lower dehydration tank for further extrusion and dehydration by a lower screw rod, finally the dehydrated material is sent to a granulator through a slag outlet for granulation, then the granulated material is applied as an organic fertilizer after being dried and shaped by a dryer, and the separated liquid enters a biogas slurry treatment device through a liquid outlet for further treatment;
s4: biogas slurry treatment
The biogas slurry collected in the biogas slurry treatment device is firstly filtered to remove harmful substances in the biogas slurry through a nanofiltration membrane, and then is collected to a biogas slurry discharge tank for land fertilization, a flushing pump in the biogas slurry discharge tank can periodically convey biogas slurry in the biogas slurry discharge tank to a flushing device, and the flushing device flushes excrement attached to an excrement collecting ditch or an excrement collecting tank.
The invention has the beneficial effects that: the biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation are particularly suitable for the anaerobic fermentation process with large livestock and poultry manure treatment capacity, an overflow layer is arranged in the anaerobic fermentation device, fermentation product biogas slurry is collected into a biogas slurry treatment device, anaerobic fermentation materials are sent to a solid-liquid separation device for fractional dehydration, the generated biogas enters a biogas treatment device for dehydration and desulfurization, the solid-liquid separation device returns a part of anaerobic activated sludge to the anaerobic fermentation device for supplement, the separated biogas slurry is sent to the biogas slurry treatment device, the separated biogas residues are granulated by a granulator and dried and formed by a dryer to be used as organic fertilizer, the collected biogas slurry is used for farmland irrigation after harmful substances in the biogas slurry are filtered by a nanofiltration membrane, and a washing pump is arranged in the biogas slurry collecting tank, and the biogas slurry is used for washing the excrement collecting ditch or the manure collecting tank, so that waste is utilized. In a word, the invention has the advantages of novel structure, perfect method, good biogas slurry and residue treatment effect, low system load and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure of an anaerobic fermentation apparatus according to the present invention;
FIG. 3 is a schematic structural view of a biogas treatment device according to the present invention;
FIG. 4 is a schematic structural view of a solid-liquid separation apparatus of the present invention.
Wherein, 1-anaerobic fermentation device, 11-tank body, 111-heat insulation layer, 12-stirring device, 121-stirring motor, 122-output shaft, 123-stirring ring, 124-slag breaking thorn, 13-overflow tank, 131-filter screen, 14-gas collecting pipe, 15-air release valve, 2-biogas processing device, 21-gas inlet, 22-condensing device, 221-cooling compressor, 222-spiral condensing pipe, 23-liquid collecting tank, 24-desulfurizing tank, 25-gas outlet, 3-solid-liquid separation device, 31-inclined plate feeding tank, 311-vibration motor, 32-reflux tank, 33-reflux pump, 34-double-helix extrusion tank, 341-upper 341dewatering tank, 1-upper screw rod, 34111-impeller-one, and, 34112-first extrusion block, 3412-upper motor, 3413-upper liquid collecting tank, 3414-upper filter screen, 3415-upper liquid outlet, 342-lower dewatering tank, 3421-lower screw rod, 34211-second impeller, 34212-second extrusion block, 3422-lower motor, 3423-lower liquid collecting tank, 3424-lower filter screen, 3425-lower liquid outlet, 343-slag outlet, 344-liquid outlet, 4-biogas residue processing device, 41-granulator, 42-dryer, 5-biogas slurry processing device, 51-biogas slurry discharging tank, 52-nanofiltration membrane, 53-flushing pump, 6-biogas collecting tank and 7-flushing device.
Detailed Description
For the understanding of the technical solution of the present invention, the following description is further illustrated with reference to fig. 1 to 4 and the specific embodiments, which are not to be construed as limiting the scope of the present invention.
Example (b): as shown in figure 1, a biogas slurry and residue treatment device based on semi-dry anaerobic fermentation mainly comprises an anaerobic fermentation device 1, a biogas treatment device 2, a solid-liquid separation device 3, a biogas residue treatment device 4 and a biogas slurry treatment device 5,
as shown in fig. 2, the anaerobic fermentation device 1 comprises a tank 11 for carrying livestock and poultry feces, a heat insulation layer 111 is wrapped outside the tank 11, a stirring device 12 arranged inside the tank 11 for stirring the materials inside the tank 11, the stirring device 12 comprises a stirring motor 121 arranged at the top of the tank 11, an output shaft 122 of the stirring motor 121 extends into the tank 11, a stirring ring 123 for stirring the materials inside the tank 11 and a slag breaking spine 124 for breaking caking and floating slag on the supernatant of the materials are arranged on the output shaft 122, an overflow chute 13 for overflowing the supernatant of the materials is arranged around the upper end inside the tank 11, a filter screen 131 for filtering floating slag in the overflowing supernatant is arranged in the overflow chute 13, a gas collecting pipe 14 for collecting biogas generated by anaerobic fermentation is arranged at the top end of the tank 11, and an emptying valve 15 for discharging fermentation products is arranged at the bottom end of the tank 11,
as shown in fig. 3, the biogas processing device 2 includes an air inlet 21 connected with the gas collecting pipe 14 for collecting biogas, a condensing device 22 disposed above the biogas processing device 2 and near the air inlet 21, the condensing device 22 includes a cooling compressor 221 disposed above the biogas processing device 2 and a spiral condensing pipe 222 disposed inside the biogas processing device 2, both ends of the spiral condensing pipe 222 are respectively connected with an input end and an output end of the cooling compressor 221, the cooling compressor 221 circulates a coolant in the spiral condensing pipe 222, a liquid collecting tank 23 disposed below the condensing device 22 for collecting condensed dripping liquid, a desulfurizing tank 24 disposed at a distal end of the biogas processing device 2 for adsorbing hydrogen sulfide in the biogas and an air outlet 25 disposed at an air outlet end of the desulfurizing tank 24, the air outlet 25 is connected with the biogas collecting tank 6, and an iron oxide filling layer is sequentially disposed in the desulfurizing tank 24 according to an air inlet direction, Calcium oxide filling layer and active carbon filling layer, the active carbon of the active carbon filling layer is alkali-dipped active carbon,
as shown in fig. 4, the solid-liquid separation device 3 includes an inclined plate feed tank 31 connected with an air release valve 15 at the upper end, a vibration motor 311 for shaking down the inclined plate feed tank 31 and attaching biogas residues thereon is disposed on the inclined plate feed tank 31, a reflux tank 32 controlled by a motor and disposed in the middle of the inclined plate feed tank 31, a reflux pump 33 connected with the reflux tank 32 for supplementing anaerobic sludge reflux to the tank 11, a double-screw extrusion tank 34 connected to the bottom end of the inclined plate feed tank 31 for dewatering fermentation products, and a slag outlet 343 and a liquid outlet 344 disposed on the double-screw extrusion tank 34 for discharging biogas residues and biogas liquids, respectively, the double-screw extrusion tank 34 includes an upper dewatering tank 341 connected with the bottom end of the inclined plate feed tank 31 and a lower dewatering tank 342 connected with the discharge port of the upper dewatering tank 341, an upper screw 3411 for squeezing biogas residues for dewatering is disposed in the upper dewatering tank 341, the upper screw 3411 is driven by an upper motor 3412 at the side end of the, impeller I34111 with gradually reduced space is arranged on the upper screw rod 3411 along the extrusion direction, an extrusion block I34112 for extruding biogas residue is arranged at the far end of the upper screw rod 3411, an upper filter screen 3414 for filtering biogas residue is arranged at the bottom of the upper dehydration tank 341, a lower screw rod 3421 for extruding biogas residue extruded by the upper dehydration tank 341 is arranged in the lower dehydration tank 342, the lower screw rod 3421 is driven by a lower motor 3422 at the side end of the lower dehydration tank 342, impeller II 34211 with gradually reduced space is arranged on the lower screw rod 3421 along the extrusion direction, an extrusion block II 34212 for extruding biogas residue is arranged at the far end of the lower screw rod 3421, a lower filter screen 3424 for filtering biogas residue is arranged at the bottom of the lower dehydration tank 342, the density of the impeller II 34211 on the lower screw rod 3421 is greater than that of the impeller I34111 on the upper screw rod 3411, an upper collection filter screen 3414 and an upper collection filter screen 3413 for collecting liquid filtered by the lower filter screen 3424 are respectively arranged at the lower dehydration tank 341 and the lower, A lower liquid collecting tank 3423, an upper liquid collecting tank 3413 and a lower liquid collecting tank 3423 are connected with the liquid outlet 344 through an upper liquid outlet 3415 and a lower liquid outlet 3415 which are arranged on the rear side surface, respectively, a slag outlet 343 is arranged at the discharge port of the lower dehydrating tank 342,
the biogas residue processing device 4 comprises a granulator 41 which is connected with the residue outlet 341 and used for granulating the biogas residue, and a dryer 42 which is used for drying and forming the granulated biogas residue,
the biogas slurry treatment device 5 comprises a biogas slurry discharge tank 51 respectively connected with the overflow tank 13, the liquid collecting tank 23 and the liquid outlet 344, a nanofiltration membrane 52 for filtering biogas slurry is arranged on the biogas slurry discharge tank 51, a flushing pump 53 is also arranged in the biogas slurry discharge tank 51, the flushing pump 53 is respectively connected with a flushing device 7 on the excrement collecting ditch or the excrement collecting tank for flushing excrement attached in the excrement collecting ditch or the excrement collecting tank by using biogas slurry,
the stirring motor 121 can be a YCT-225 servo motor, the cooling compressor 221 can be a MRI-BCC Freon compressor, the vibration motor 311 can be a YAZO vibration motor, the reflux pump 33 can be a QJB-W sludge reflux pump, the upper motor 3412 and the lower motor 3422 can be YVF2 variable frequency motors, the granulator 41 can be a ZL1500 organic fertilizer granulator, the dryer 42 can be an SJ roller dryer, the flushing pump 53 can be an LF1314 high-pressure flushing pump, and the flushing device 7 can be a HDPE spray type flushing head.
The working method of the above embodiment comprises the following steps:
s1: semi-dry anaerobic fermentation
Conveying livestock and poultry manure with TS more than 20% into an anaerobic fermentation device 1 for anaerobic fermentation, wherein the material stays for 15-20d, the material is periodically stirred by a stirring device 12 in the anaerobic fermentation process, supernatant of anaerobic fermentation products flows into a biogas slurry treatment device 5 through an overflow tank 13 for further treatment, in the stirring process of the stirring device 12, scum caked on the surface of the supernatant can be crushed by a scum breaking thorn 124 on an output shaft 122 of the stirring device, the scum caked is prevented from influencing the deflation of the fermentation products, the crushed scum is intercepted by a filter screen 131 in the overflow tank 13, after the anaerobic fermentation is finished, the material in a tank body 11 is emptied by an emptying valve 15, the discharged material enters a solid-liquid separation device 3 for further treatment, and biogas generated in the anaerobic fermentation process enters a biogas treatment device 2 through a gas collecting pipe 14 for further treatment;
s2: biogas collection and treatment
The biogas mixed with biogas slurry steam enters the biogas treatment device 2 through the gas inlet 21 and passes through the spiral condenser pipe 222 of the condensing device 22, the mixed steam in the biogas is condensed into liquid under the action of a coolant in the spiral condenser pipe 222 and falls into the liquid collecting tank 23, the dried biogas passes through the desulfurizing tank 24 and then is introduced into the biogas collecting tank 6 for collection and standby, and the biogas slurry collected in the liquid collecting tank 23 is transmitted to the biogas slurry treatment device 5 for further treatment;
s3: biogas residue treatment
The materials discharged from the tank body 11 enter the double-helix extrusion tank 34 through the inclined plate feeding tank 31 for solid-liquid separation, a part of the materials collected by the reflux tank 32 can be refluxed into the tank body 11 by the reflux pump 33 to supplement anaerobic activated sludge in the anaerobic fermentation device 1, the materials entering the double-helix extrusion tank 34 are firstly primarily extruded and dehydrated by the upper screw 3411 of the upper dehydration tank 341, the dehydrated materials enter the lower dehydration tank 342 for further extrusion and dehydration by the lower screw 3421, the finally dehydrated materials are sent to the granulator 41 through the slag outlet 343 for granulation, then the materials are dried and shaped by the dryer 42 to be used as organic fertilizers for application, and the separated liquid enters the biogas slurry treatment device 5 through the liquid outlet 344 for further treatment;
s4: biogas slurry treatment
The biogas slurry collected in the biogas slurry treatment device 5 is firstly filtered to remove harmful substances in the biogas slurry through the nanofiltration membrane 52, and then is collected to the biogas slurry discharge tank 51 for land fertilization, the flushing pump 53 in the biogas slurry discharge tank 51 can periodically convey the biogas slurry in the biogas slurry discharge tank 51 to the flushing device 7, and the flushing device 7 flushes the adhered excrement on the excrement collecting ditch or the excrement collecting tank.

Claims (9)

1. A biogas slurry and residue treatment device based on semi-dry anaerobic fermentation is characterized by mainly comprising an anaerobic fermentation device (1), a biogas treatment device (2), a solid-liquid separation device (3), a biogas residue treatment device (4) and a biogas slurry treatment device (5),
the anaerobic fermentation device (1) comprises a tank body (11) for bearing livestock and poultry feces, a stirring device (12) which is arranged in the tank body (11) and is used for stirring materials in the tank body (11), an overflow groove (13) which is arranged at the upper end in the tank body (11) in a surrounding way and is used for overflowing supernatant of the materials, a gas collecting pipe (14) which is arranged at the top end of the tank body (11) and is used for collecting methane generated by anaerobic fermentation, and an emptying valve (15) which is arranged at the bottom end of the tank body (11) and is used for discharging fermentation products,
the biogas treatment device (2) comprises a gas inlet (21) connected with the gas collecting pipe (14) and used for collecting biogas, a condensing device (22) arranged above the biogas treatment device (2) and close to the side of the gas inlet (21), a liquid collecting tank (23) arranged below the condensing device (22) and used for collecting condensed dripping liquid, a desulfurization tank (24) arranged at the far end of the biogas treatment device (2) and used for adsorbing hydrogen sulfide in the biogas and a gas outlet (25) arranged at the gas outlet end of the desulfurization tank (24), wherein the gas outlet (25) is connected with a biogas collecting tank (6),
the solid-liquid separation device (3) comprises an inclined plate feeding groove (31) with the upper end connected with the emptying valve (15), a reflux groove (32) which is arranged in the middle of the inclined plate feeding groove (31) and is controlled by a motor to be switched, a reflux pump (33) which is connected with the reflux groove (32) and is used for supplementing anaerobic sludge to the tank body (11) in a reflux manner, a double-helix extrusion groove (34) which is connected with the bottom end of the inclined plate feeding groove (31) and is used for dehydrating fermentation products, and a slag outlet (343) and a liquid outlet (344) which are arranged on the double-helix extrusion groove (34) and are used for respectively discharging biogas residues and biogas slurry,
the biogas residue treatment device (4) comprises a granulator (41) which is connected with the residue outlet (341) in sequence and is used for granulating the biogas residue and a dryer (42) which is used for drying and forming the granulated biogas residue,
the biogas slurry treatment device (5) comprises a biogas slurry discharge pool (51) which is respectively connected with the overflow groove (13), the liquid collecting groove (23) and the liquid outlet (344), wherein a nanofiltration membrane (52) for filtering biogas slurry is arranged on the biogas slurry discharge pool (51), a flushing pump (53) is also arranged in the biogas slurry discharge pool (51), and the flushing pump (53) is respectively connected with a flushing device (7) on the excrement collecting ditch or the excrement collecting tank and is used for flushing attached excrement in the excrement collecting ditch or the excrement collecting tank by using biogas slurry.
2. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation as claimed in claim 1, wherein the tank body (11) is externally wrapped with an insulating layer (111).
3. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation of claim 1, wherein the overflow trough (13) is internally provided with a filter screen (131) for filtering scum in overflow supernatant.
4. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation as claimed in claim 1, wherein the condensing device (22) comprises a cooling compressor (221) arranged above the biogas treatment device (2) and a spiral condensing pipe (222) arranged inside the biogas treatment device (2), two ends of the spiral condensing pipe (222) are respectively connected with the input end and the output end of the cooling compressor (221), and the cooling compressor (221) circulates a coolant in the spiral condensing pipe (222).
5. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation according to claim 1, wherein an iron oxide filling layer, a calcium oxide filling layer and an activated carbon filling layer are sequentially arranged in the desulfurization tank (24) according to the air intake direction, and the activated carbon of the activated carbon filling layer is alkali-impregnated activated carbon.
6. The biogas slurry and residue treatment device based on the semi-dry anaerobic fermentation as claimed in claim 1, wherein the inclined plate feeding groove (31) is provided with a vibration motor (311) for shaking off biogas residues hung on the inclined plate feeding groove (31).
7. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation as claimed in claim 1, wherein the double-screw extrusion tank (34) comprises an upper dehydration tank (341) connected with the bottom end of the inclined plate feeding tank (31) and a lower dehydration tank (342) connected with the discharge port of the upper dehydration tank (341),
an upper screw rod (3411) used for extruding biogas residues for dewatering is arranged in the upper dewatering tank (341), the upper screw rod (3411) is driven by an upper motor (3412) at the side end of the upper dewatering tank (341), a first impeller (34111) with gradually reduced intervals is arranged on the upper screw rod (3411) along the extrusion direction, a first extrusion block (34112) used for extruding the biogas residues is arranged at the far end of the upper screw rod (3411), an upper filter screen (3414) used for filtering the biogas residues is further arranged at the bottom of the upper dewatering tank (341),
a lower spiral rod (3421) used for extruding biogas residues extruded by the upper dehydration tank (341) is arranged in the lower dehydration tank (342), the lower spiral rod (3421) is driven by a lower motor (3422) at the side end of the lower dehydration tank (342), a second impeller (34211) with gradually reduced space is arranged on the lower spiral rod (3421) along the extrusion direction, an extrusion block II (34212) used for extruding biogas residues is arranged at the far end of the lower spiral rod (3421), a lower filter screen (3424) used for filtering biogas residues is arranged at the bottom of the lower dehydration tank (342),
the density of a second impeller (34211) on the lower screw rod (3421) is greater than that of a first impeller (34111) on the upper screw rod (3411), the lower parts of the upper dewatering tank (341) and the lower dewatering tank (342) are respectively provided with an upper liquid collecting tank (3413) and a lower liquid collecting tank (3423) which are used for collecting upper filter screens (3414) and lower filter screens (3424) to filter liquid, the upper liquid collecting tank (3413) and the lower liquid collecting tank (3423) are respectively connected with the liquid outlet (344) through an upper liquid outlet (3415) and a lower liquid outlet (3415) which are arranged on the rear side face, and the slag outlet (343) is arranged at the discharge port of the lower dewatering tank (342).
8. The biogas slurry and residue treatment device based on semi-dry anaerobic fermentation as claimed in claim 1, wherein the tank body (11) is externally wrapped with an insulating layer (111).
9. The method for treating biogas slurry and residue in semi-dry anaerobic fermentation by using the device of any one of claims 1 to 8 is characterized by mainly comprising the following steps:
s1: semi-dry anaerobic fermentation
Conveying livestock and poultry manure with TS more than 20% into an anaerobic fermentation device (1) for anaerobic fermentation, wherein the material retention time is 15-20d, periodically stirring through a stirring device (12) in the anaerobic fermentation process, allowing supernatant of anaerobic fermentation products to flow into a biogas slurry treatment device (5) through an overflow trough (13) for further treatment, and allowing the stirring device (12) to stir, scum caked on the surface of the supernatant can be crushed by the slag-breaking thorn (124) on the output shaft (122) of the anaerobic fermentation tank, the scum caked can be prevented from influencing the air release of the fermentation product, the crushed scum is intercepted by the filter screen (131) in the overflow trough (13), after the anaerobic fermentation is finished, emptying the materials in the tank body (11) through an emptying valve (15), further treating the discharged materials in a solid-liquid separation device (3), and further treating the methane generated in the anaerobic fermentation process in a methane treatment device (2) through a gas collecting pipe (14);
s2: biogas collection and treatment
Biogas mixed with biogas slurry steam enters the biogas treatment device (2) through the air inlet (21) and passes through the spiral condenser pipe (222) of the condensing device (22), the mixed steam in the biogas is condensed into liquid under the action of a coolant in the spiral condenser pipe (222) and falls into the liquid collecting tank (23), the dried biogas passes through the desulfurizing tank (24) and then is introduced into the biogas collecting tank (6) for collection and standby, and the biogas slurry collected in the liquid collecting tank (23) is transmitted to the biogas slurry treatment device (5) for further treatment;
s3: biogas residue treatment
Materials discharged from a tank body (11) enter a double-helix extrusion tank (34) through an inclined plate feeding tank (31) for solid-liquid separation, a reflux pump (33) can reflux a part of the materials collected by a reflux tank (32) into the tank body (11) to supplement anaerobic activated sludge in an anaerobic fermentation device (1), the materials entering the double-helix extrusion tank (34) are firstly preliminarily extruded and dehydrated by an upper spiral rod (3411) of an upper dehydration tank (341), the dehydrated materials enter a lower dehydration tank (342) for further extrusion and dehydration by a lower spiral rod (3421), the finally dehydrated materials are sent to a granulator (41) through a slag outlet (343) for granulation, then are dried and shaped by a dryer (42) and are applied as organic fertilizers, and the separated liquid enters a biogas slurry treatment device (5) through a liquid outlet (344) for further treatment;
s4: biogas slurry treatment
The biogas slurry collected in the biogas slurry treatment device (5) is firstly filtered to remove harmful substances in the biogas slurry through a nanofiltration membrane (52), and then is collected to a biogas slurry discharge pool (51) for land fertilization, a flushing pump (53) in the biogas slurry discharge pool (51) can periodically convey the biogas slurry in the biogas slurry discharge pool (51) to a flushing device (7), and the flushing device (7) flushes the adhered fecal sewage on a feces collection ditch or a feces collection tank.
CN202010393626.9A 2020-05-11 2020-05-11 Biogas slurry and residue treatment device and method based on semi-dry anaerobic fermentation Withdrawn CN111661990A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112626130A (en) * 2021-01-07 2021-04-09 安庆市绿巨人环境技术股份有限公司 Wet anaerobic fermentation method
CN113429098A (en) * 2021-08-06 2021-09-24 农业部沼气科学研究所 Medium-solid fermentation process for improving feeding load of biogas produced by anaerobic digestion of chicken manure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112626130A (en) * 2021-01-07 2021-04-09 安庆市绿巨人环境技术股份有限公司 Wet anaerobic fermentation method
CN113429098A (en) * 2021-08-06 2021-09-24 农业部沼气科学研究所 Medium-solid fermentation process for improving feeding load of biogas produced by anaerobic digestion of chicken manure

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