CN102145258B - Method for cleaning heavy oil sludge-polluted membrane module - Google Patents
Method for cleaning heavy oil sludge-polluted membrane module Download PDFInfo
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Abstract
The invention discloses a method for cleaning a heavy oil sludge-polluted membrane module, which realizes the cleaning for the heavy oil sludge-polluted membrane module by stepwise combination of online backwash with clean water, acidic hydrogen peroxide solution with the concentration of 300ppm to 500ppm and sodium hypochlorite solution with the concentration of 300ppm to 500ppm, and high strength aeration. After the membrane module is cleaned, the water flux of the membrane reaches 130m3/h under negative pressure of -0.02mPa according to one-week real-time monitoring, thus the water flux restores to the level as much as 92.86% of initial flux so as to meet the demand of the design flux of 125m3/h required by normal operation of system. The method for cleaning heavy oil sludge-polluted curtain membrane restores membrane flux effectively and simultaneously saves a great amount of manpower and resources, besides, the online cleaning in the method of the invention is characterized by directly adding agents to the heavily-polluted area of the membrane, so the agents are strongly targeted and high in utilization rate, and compared with offline cleaning in the manner of immersing the membrane module in a cleaning pool, the method saves plenty of agents, is more remarkable in effect and has superior market prospect.
Description
Technical field
The invention belongs to technical field of waste water processing, relate to a kind of PP(polypropylene that cleans heavy oil sludge-polluted) method of hollow fiber curtain type membrane component, in particular, be the method for utilizing the method for online clear water backwash and certain concentration medicament substep combination that membrane module is cleaned.
Background technology
Membrane separation technique is a kind ofly to be widely used in that solution or gaseous matter separate, the concentrated and isolation technics of purifying.The membranous wall micropore gathers, and by a side of film, it is filter liquor that solvent and little molecule solute see through membranous wall to stoste under certain pressure, and large molecule solute tunicle is held back, and reaches separating substances and concentrated purpose.Adopt membrane technology to carry out pollutant and separate with hydrone, the water resource of preciousness can be carried out the secondary utilization.Membrane bioreactor (Membrane Bio-Reactor, MBR) is a kind of Novel state Waste Water Treatment with membrane separation technique and biologic treating technique combination.The built-in membrane bioreactor is a kind of of membrane bioreactor, is membrane module to be immersed to aspirate simultaneously in the biochemistry pool produce pressure differential inside and outside making film, and then realizes the isolated by filtration effect of film.Hollow fiber curtain type membrane component is a kind of membrane module that is specially adapted for the built-in membrane bioreactor.
Heavy oil mud refers to by the various ingredients such as heavy oil and ordinary activated sludge, the surfactant assorted greasy filth shape mixture together of mixing.Have viscosity large, be difficult to the characteristics such as degraded, hydrophily be poor.After this heavy oil sludge-polluted curtain type membrane, the one deck that forms on the surface of film mixes the cake layer that forms by heavy oil and activated sludge and inorganic matter, is difficult to be washed away by aeration; The gel layer that also exists simultaneously one deck to be formed by the concentration polarization effect by the solubility metabolite of dissolubility macromolecule organic and microorganism on the film surface; And in fenestra and the film inner surface form the polluted membrane that one deck mainly is made of microorganism.The reason of these several respects occurs simultaneously, thereby cause the severe contamination of film, membrane flux sharply descends, traditional aeration washes away and online clear water backwash and medicine are washed and can not be recovered membrane flux, must take membrane module is disassembled the method for the off-line cleaning of carrying out the medicament immersion, take time and effort and poor effect.Details are as follows with doughnut curtain type membrane cleaning method with traditional MBR for the below:
A, online clear water clean: the operating pressure that is applicable to diaphragm just reaches-0.03 MPa.
Finger under the prerequisite of moving film equipment not, transfers to influent side to the clear water that is parity with or superiority over through the liquid quality from the product water side of hollow fiber film thread in the running of membrane bioreactor, opposite with the water (flow) direction of filter process.Can loosen and wash away the MBR film outer surface pollutes.
B, online Chemical cleaning: the operating pressure that is applicable to diaphragm uses when surpassing-0.03 MPa or carrying out online clear water DeGrain.
Finger under the prerequisite of moving film equipment not, transfers to influent side to the finite concentration cleaning solution from the product water side of hollow fiber film thread in the running of membrane bioreactor, opposite with the water (flow) direction of filter process.Can loosen and wash away the MBR film outer surface and pollute, and the bacterium that grows of killing in the fenestra road is had certain effect.The conventional chemical cleaning agent is generally 300 ~ 500ppm clorox, and cleaning way is generally by the disposable membrane module of squeezing into of backwashing pump.
C, off-line Chemical cleaning: the operating pressure that is applicable to diaphragm surpasses-0.05MPa, and through after the online Chemical cleaning repeatedly, adopts when cleaning performance is still not obvious.
Finger takes out membrane module from the MBR pond after, the process of in different medicine wash pools, soaking respectively, cleaning.The medicament that soaks, cleans is generally the liquor natrii hypochloritis that concentration is no more than 500ppm, 1 ~ 2% NaOH solution, 1 ~ 2% HCl solution or citric acid solution.
For the MBR membrane module of heavy oil sludge-polluted, use that traditional online clear water cleans and the method for online Chemical cleaning all is difficult to the effect of realizing ideal; And the off-line Chemical cleaning is because the needed amount of labour and pharmaceutical quantities are larger, and need the scene to possess ready-made service sink and hanging device, therefore, larger for treatment scale, the on-the-spot engineering that does not possess cleaning condition, the off-line Chemical cleaning has certain limitation.In addition, using conventional medicament carries out soaking and washing to the membrane module of heavy oil sludge-polluted and also is difficult to realize comparatively desirable effect.
Summary of the invention
Through a large amount of document and retrieval proof, China does not similarly utilize the acid hydrogenperoxide steam generator of certain concentration, liquor natrii hypochloritis so far online, with the combination of high strength aeration substep, the patent documentation that the PP curtain type membrane of heavy oil sludge-polluted cleans is delivered.For this reason, the invention provides a kind of method of cleaning the PP membrane module of heavy oil sludge-polluted, the cleaning method of the heavy oil sludge-polluted PP curtain type membrane that relates among the present invention is on the basis of the characteristics of fully understanding heavy oil sludge-polluted and PP material membrane module, by utilizing the acid hydrogenperoxide steam generator of certain concentration, liquor natrii hypochloritis, with the combination of high strength aeration substep, effectively recover membrane flux, a large amount of manpower and materials have been saved simultaneously, under equal operating pressure, the average film effluent flux returns near original flux.
For achieving the above object, the invention provides following technical scheme:
A kind of cleaning method of membrane module of heavy oil sludge-polluted, it is characterized in that it is that the online clear water backwash of employing and concentration are the acid hydrogenperoxide steam generator of 300ppm-500ppm, 300ppm-500ppm liquor natrii hypochloritis, and the mode of high strength aeration substep combination is cleaned the membrane module of heavy oil sludge-polluted.
Cleaning method of the present invention, wherein said online clear water backwash refer to inject clear water 4-6h by online backwashing system toward inner the continuing of membrane module, and membrane module top layer cake layer is come off in a large number.
Cleaning method of the present invention, membrane module wherein is: 12m
2The polypropylene hollow fiber curtain type membrane of/sheet.
Cleaning method of the present invention, preferred acidic hydrogenperoxide steam generator concentration wherein is 300ppm, the pH value of solution is 1-2; Liquor natrii hypochloritis's concentration of the present invention is 500ppm.
PH value of the present invention refers to for the acid hydrogenperoxide steam generator of 1-2: adopting watery hydrochloric acid (3-5%) is to use after the hydrogenperoxide steam generator of 300ppm is adjusted to pH value 1-2 with concentration.
Cleaning method of the present invention, heavy oil mud wherein refer to by heavy oil and ordinary activated sludge, the surfactant various ingredients assorted greasy filth shape mixture together of mixing.
The cleaning method of the membrane module of the more detailed heavy oil sludge-polluted of the present invention, undertaken by following step:
(1) at first the membrane cisterna liquid level is down to and just exposes membrane module;
(2) continue to inject clear water in membrane module by backwashing system, injection rate is every film 100L clear water, and operating pressure carries out abundant high strength aeration to membrane module simultaneously between 0.1 ~ 0.2mpa, and gas-water ratio maintains 30:1 ~ 50:1, continues 2-6 h;
(3) inject the acid hydrogenperoxide steam generator of 300ppm-500ppm in the membrane module by backwashing system and carry out backwash, injection rate is the acid hydrogenperoxide steam generator of every film 20L, leaves standstill and soaks 12 ~ 16h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1 ~ 75:1, each units alternately aeration 4 ~ 6h, stop aeration after, then process the mud that comes off from film;
(4) the anti-cleaning step of acid hydrogenperoxide steam generator of repeating step (3);
(5) the anti-cleaning step of clear water of repeating step (2) then;
(6) be that the 300ppm-500ppm liquor natrii hypochloritis carries out backwash by backwashing system implantation concentration in the membrane module again, injection rate is that every film 20L liquor natrii hypochloritis is left standstill and soaked 12 ~ 16h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1 ~ 75:1, each units alternately aeration 4 ~ 6h, stop aeration after, process the mud that comes off from film;
(7) whole system is continued aeration 12-24 hour, then whole system cleaning situation is detected assessment, take the entire system water-flowing amount return to initial water-flowing amount more than 80% as the success; Wherein said membrane module is 12m
2/ sheet polypropylene hollow fiber curtain type membrane.
The present invention continues to inject clear water and carries out preliminary backwash in membrane module, purpose is that wash-out partly is infected with relatively poor bulky grain activated sludge and the inorganic impurity of adhesiveness on the film silk, reduces the thickness of cake layer.Carry out aeration after backwash a period of time and wash away, sweep away the relatively poor pollutant of adhesive capacity.
The present invention adds internally membrane module with a certain amount of acid hydrogenperoxide steam generator online and carries out backwash, because hydrogen peroxide has stronger oxidisability, thereby can the most organic matter of oxidation and make the microprotein sex change lose adhesiveness, for very large take organic pollution and microbial contamination as the membrane washing effect of leading.In addition, acid hydrogenperoxide steam generator is the inner and surperficial calcium magne-scale of dissolving film silk fully, prevents follow-up clorox alkali cleaning aggravation fouling.
Hydrogen peroxide medicine is first washed the organic pollution that immersion can be become flexible film silk surface attachment, and removes by high strength aeration subsequently; Secondary hydrogen peroxide medicine is washed immersion can further kill and the loosen microorgranic contaminant of inside, film silk duct, is removed under the effect of high strength aeration equally.Can determine number of times that the hydrogen peroxide medicine is washed and concrete concentration according to the exact level that pollutes in the implementation.
Inject a certain amount of liquor natrii hypochloritis in the most backward membrane module of the present invention, leave standstill a period of time.The liquor natrii hypochloritis is used for carrying out alkali cleaning, mainly the oily sludge thing of remnants is cleaned and the adjusting of acid-base value.Last aeration washes away until membrane flux returns near previous level.
The good effect that the cleaning method of heavy oil sludge-polluted curtain type membrane disclosed by the invention compared with prior art has is:
(1) heavy oil sludge-polluted curtain type membrane cleaning method of the present invention efficient quick is more compared with the method for traditional off-line soaking and washing membrane module, has saved a large amount of manpower and materials.And because on-line cleaning of the present invention is directly to add medicament (the hydrogen peroxide medicine is washed, liquor natrii hypochloritis) to film silk heavily contaminated area, with strong points and the utilization rate of medicament is very high, with respect to off-line soaking and washing in service sink, saved a large amount of medicaments, and effect is more obvious.
(2) after employing heavy oil sludge-polluted curtain type membrane cleaning method of the present invention had cleaned, curtain type membrane was through the Real-Time Monitoring in a week, and under negative pressure-0.02mPa condition, the film effluent flux reaches 130m
3/ h returns to 92.86% of initial flux, meets the design flux 125m of the normal operation of system
3The requirement of/h.
The specific embodiment
Below, the present invention will carry out detailed description by preferred embodiment.These embodiment are for more detailed description the present invention, but and do not mean that the present invention is had any restriction.
Embodiment 1
(1) at first the membrane cisterna liquid level is down to and just exposes membrane module;
(2) continue to inject clear water in membrane module by backwashing system, injection rate is every film 100L clear water, and operating pressure carries out abundant high strength aeration to membrane module simultaneously between 0.1mpa, and gas-water ratio maintains 30:1, continues 3 h;
(3) inject the acid hydrogenperoxide steam generator of 300ppm in the membrane module by backwashing system and carry out backwash, injection rate is the acid hydrogenperoxide steam generator of every film 20L, leaves standstill and soaks 12h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1, each units alternately aeration 4 h, stop aeration after, then process the mud that comes off from film;
(4) the anti-cleaning step of acid hydrogenperoxide steam generator of repeating step (3);
(5) the anti-cleaning step of clear water of repeating step (2) then;
(6) be that the 300ppm liquor natrii hypochloritis carries out backwash by backwashing system implantation concentration in the membrane module again, injection rate is that every film 20L liquor natrii hypochloritis is left standstill and soaked 12h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1, each units alternately aeration 4 h, stop aeration after, process the mud that comes off from film;
(7) whole system was continued aeration 12 hours, then whole system cleaning situation is detected assessment, take the entire system water-flowing amount return to initial water-flowing amount more than 80% as qualified; Wherein said membrane module is 12m2/ sheet polypropylene hollow fiber curtain type membrane.
Embodiment 2
(1) at first the membrane cisterna liquid level is down to and just exposes membrane module;
(2) continue to inject clear water in membrane module by backwashing system, injection rate is every film 100L clear water, and operating pressure carries out abundant high strength aeration to membrane module simultaneously between 0.2mpa, and gas-water ratio maintains 50:1, continues 6 h;
(3) inject the acid hydrogenperoxide steam generator of 500ppm in the membrane module by backwashing system and carry out backwash, injection rate is the acid hydrogenperoxide steam generator of every film 20L, leaves standstill and soaks 16h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 75:1, each units alternately aeration 6 h, stop aeration after, then process the mud that comes off from film;
(4) the anti-cleaning step of acid hydrogenperoxide steam generator of repeating step (3);
(5) the anti-cleaning step of clear water of repeating step (2) then;
(6) be that the 500ppm liquor natrii hypochloritis carries out backwash by backwashing system implantation concentration in the membrane module again, injection rate is that every film 20L liquor natrii hypochloritis is left standstill and soaked 16 h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 75:1, each units alternately aeration 6 h, stop aeration after, process the mud that comes off from film;
(7) whole system was continued aeration 18 hours, then whole system cleaning situation is detected assessment, take the entire system water-flowing amount return to initial water-flowing amount more than 80% as the success; Wherein said membrane module is 12m2/ sheet polypropylene hollow fiber curtain type membrane.
Embodiment 3 practical applications
Adopted the MBR(membrane bioreactor on the oil extraction-generated waste water treatment system of certain crude oil factory) technology, employing be the PP(polypropylene) the doughnut curtain type membrane of material.Use altogether 22 groups of membrane modules, every group contains 132 curtain type membranes, and every film membrane area is 12m
2/ sheet, a day processing water yield is 2500 tons.Production accident has occured for some reason, and on-site supervision is not in place, causes a large amount of waste water that contains heavy oil and surfactant to enter the MBR pond, this kind waste water is difficult to degraded, after activated sludge was combined, it was very high to have formed stickiness, the greasy filth shape material that hydrophily is very poor.After this kind greasy filth shape material pollutes film, cause membrane flux sharply to descend, under negative pressure-0.02mPa condition, its flux operation numerical value is by 140 m of initial flux
3/ h drops to 40m
3The design flux of the normal operation of/h(system is 125m
3/ h).Common online clear water backwash and medicine are washed membrane flux is recovered.So used in this example the method described in the present invention.Cleaning step is as follows:
(1) the original mud in MBR pond is cleared before cleaning, liquid level is down to and is just exposed membrane support and get final product, and stops to aspirate water outlet;
(2) inject clear water by backwashing system in membrane module, injection rate is every film 100L clear water (such as the described PP(polypropylene of summary of the invention) doughnut curtain type membrane (12m
2/ sheet), operating pressure carries out abundant high strength aeration to membrane module simultaneously between 0.1 ~ 0.2mpa, and gas-water ratio maintains 30:1 ~ 50:1, continues 2-6 h, and the relatively poor cake layer of adhesion that is attached to film silk surface is washed away.Then stop aeration, discharge behind the sludge settling in the pond and process.
(3) carrying out first, acid hydrogen peroxide cleans: (content of hydrogen peroxide is 300ppm to every group of membrane module (132/group) to inject 2 tons of cleaning agents, 3% watery hydrochloric acid is adjusted to pH value 2), after whole cleaning agents inject, close all dosing pipe valves, leave standstill and soak 12 h.Utilize acid hydrogenperoxide steam generator that organic pollution and microbial contamination film are carried out high-efficiency washing.After immersion is finished, membrane module is carried out the high strength aeration, start blower fan, make every group of membrane support aeration rate increase to 3 ~ 5 times of operational factor at ordinary times, gas-water ratio maintains 45:1 ~ 75:1, and 22 groups of membrane supports are divided into 6 flushing unit, each units alternately aeration 4 h.After stopping aeration, process the mud that comes off from film.
(4) the acid hydrogenperoxide steam generator anti-cleaning step of repetition shown in (3);
(5) the clear water anti-cleaning step of repetition shown in (2);
(6) utilize the liquor natrii hypochloritis to carry out alkali cleaning.According to the anti-cleaning step of above-mentioned medicament, in membrane module, inject the liquor natrii hypochloritis, every group of membrane module (132/group) injects 2 tons of cleaning agents, and the concentration of the clorox that injects is 500ppm.Leave standstill and soak 6 h.Then the aeration method shown in (3) continues aeration 4 h to membrane module.
(7) after above-mentioned steps is finished, whole system was continued aeration 12 hours.Then by professional operating personnel whole system cleaning situation is detected assessment.Normal operation can recover in system after detection was finished.After membrane module had cleaned, through the Real-Time Monitoring in a week, under negative pressure-0.02mPa condition, the film effluent flux reached 130m
3/ h returns to 92.86% of initial flux, meets the design flux 125m of the normal operation of system
3The requirement of/h.
Film Special flux recovery efficiency γ=K/K commonly used
0The fine or not degree that * 100% evaluated for film is cleaned.
In the formula, K--clean caudacoria than flux, L/ (m
2H);
K
0--cleaning film is than flux, L/ (m
2H).
In the method, film has effectively recovered most of original membrane flux than flux response rate γ=92.86%.
Embodiment 4
Contrast test (cleaning of clorox off-line)
Take traditional clear water backwash to clean with the mode that off-line liquor natrii hypochloritis soaking and washing combines to membrane module, liquor natrii hypochloritis's concentration is 500ppm.
Take out the PP curtain type membrane of 1 group of heavy oil sludge-polluted reserving in advance among the embodiment 3, its pollution condition is identical with pollution condition among the embodiment 3.And single group membrane flux is by 5.7m
3/ h drops to 1.8 m
3Under/h(negative pressure-0.02mPa condition).
Cleaning step is as follows:
(1) with one group of membrane module (132/group) dismounting, washes away surperficial mud scum with giant.
(2) membrane module is continued from inside outwards to inject clear water, continue 2 h.
(3) carry out liquor natrii hypochloritis's alkali cleaning: this group membrane module (132/group) dismounting is rear to be liquor natrii hypochloritis's immersion of 500ppm by concentration, for realizing that the effect of the complete submergence of this part film in the implementation, has been used 6 tons of cleaning agents.Leave standstill and soak 24 h.
(4) after immersion is finished, process the mud that comes off, and again membrane module is continued from inside outwards to inject clear water, continue 2-6 h.Cleaning is finished.Then install back original support.The test membrane flux.
(5) result: single group membrane flux is multiple to 2.9 m next time with equal pressure
3/ h; Film Special flux recovery efficiency γ=50.9%.
Embodiment 5
Contrast test (acid hydrogen peroxide and clorox off-line clean)
Take the clear water backwash to replace the method that soaking and washing combines with two kinds of medicaments to membrane module.
Take out the PP curtain type membrane of 1 group of heavy oil sludge-polluted reserving in advance among the embodiment 3, its pollution condition is identical with pollution condition among the embodiment 3.And single group membrane flux is by 5.7m
3/ h drops to 1.8 m
3Under/h(negative pressure-0.02mPa condition).
Cleaning step is as follows:
(1) with one group of membrane module (132/group) dismounting, washes away surperficial mud scum with giant.
(2) membrane module is continued from inside outwards to inject clear water, continue 2-6 h.
(3) carrying out hydrogenperoxide steam generator cleans: it is 300ppm by concentration that this group membrane module (132/group) is dismantled rear, the adjusting of pH=2(hydrochloric acid) hydrogenperoxide steam generator soaks, for realizing that the effect of the complete submergence of this part film in the implementation, has been used 6 tons of cleaning agents.Leave standstill and soak 24 h.
(4) after immersion is finished, process the mud that comes off, and again membrane module is continued from inside outwards to inject clear water, continue 2 h.
(5) carry out liquor natrii hypochloritis's alkali cleaning in another rinse bath: liquor natrii hypochloritis's concentration of using is 500ppm, for realizing that the effect of the complete submergence of this part film in the implementation, has been used 6 tons of cleaning agents.Leave standstill and soak 24 h.
(6) after immersion is finished, process the mud that comes off, and again membrane module is continued from inside outwards to inject clear water, continue 2 h.Cleaning is finished.Then install back original support.The test membrane flux.
(7) result: single group membrane flux is multiple to 5.2 m next time with equal pressure
3/ h; Film Special flux recovery efficiency γ=91.22%.
The present invention adopts the acid hydrogenperoxide steam generator of online clear water backwash and certain concentration, liquor natrii hypochloritis, and the mode of high strength aeration substep combination is cleaned the PP(polypropylene of heavy oil sludge-polluted) curtain type film assembly.Result: compare with the cleaning method that traditional off-line utilizes clear water cleaning and liquor natrii hypochloritis to soak membrane module, the film Special flux recovery efficiency improves a lot, take the membrane module of one group of 132 film of same cleaning as example, tradition off-line soaking and washing film Special flux recovery efficiency is 50.9%, 92.86% the recovery rate that reaches after clean with the method for the invention.
In addition, the membrane module that cleans with the method for same high concentration medicament (comprising acid hydrogenperoxide steam generator and liquor natrii hypochloritis related among the present invention) off-line soaking and washing, although the film Special flux recovery efficiency is 91.22%, 92.86% the recovery rate that reaches near the inventive method, but because cleaning, off-line need expend a large amount of manpowers, and the complete employed pharmaceutical quantities of submergence membrane module also is much higher than the medicament that uses in the inventive method, and (both contrasts are: to clean one group of membrane module that contains 132 films as example, off-line cleans and uses acid hydrogen peroxide (300ppm) 6 tons, 6 tons of clorox (500ppm); On-line cleaning method involved in the present invention is used 4 tons of acid hydrogen peroxide (300ppm), 2 tons of clorox (500ppm)).
Conclusion: cleaning method of the present invention can clean the PP curtain type membrane of heavy oil sludge-polluted efficiently, and the advantage that the incomparable effect of conventional method is arranged and must not remove and install, save a large amount of manpower and materials has good market application foreground.
In this specification, the present invention is described with reference to specific example.But the modification that this kind invention still can be carried out on the various details does not deviate from spirit of the present invention and scope in conversion.Therefore, this specification can be considered to illustrative but not be determinate.
Claims (3)
1. the cleaning method of the membrane module of a heavy oil sludge-polluted, it is characterized in that it is that the online clear water backwash of employing and concentration are the acid hydrogenperoxide steam generator of 300ppm-500ppm, 300ppm-500ppm liquor natrii hypochloritis, and the mode of high strength aeration substep combination is cleaned the membrane module of heavy oil sludge-polluted; Wherein said online clear water backwash refers to inject clear water 4-6h by online backwashing system toward inner the continuing of membrane module, and membrane module top layer cake layer is come off in a large number; Described membrane module is: 12m
2The polypropylene hollow fiber curtain type membrane of/sheet; Described acid hydrogenperoxide steam generator concentration is 300ppm, and the pH value of solution is 1-2; Liquor natrii hypochloritis's concentration is 500ppm.
2. cleaning method claimed in claim 1, heavy oil mud wherein refer to by heavy oil and ordinary activated sludge, the surfactant various ingredients assorted greasy filth shape mixture together of mixing.
3. cleaning method claimed in claim 1 is characterized in that being undertaken by following step:
(1) at first the membrane cisterna liquid level is down to and just exposes membrane module;
(2) continue to inject clear water in membrane module by backwashing system, injection rate is every film 100L clear water, and operating pressure carries out abundant high strength aeration to membrane module simultaneously between 0.1 ~ 0.2mpa, and gas-water ratio maintains 30:1 ~ 50:1, continues 2-6 h;
(3) inject the acid hydrogenperoxide steam generator of 300ppm-500ppm in the membrane module by backwashing system and carry out backwash, injection rate is the acid hydrogenperoxide steam generator of every film 20L, leaves standstill and soaks 12 ~ 16 h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1 ~ 75:1, each units alternately aeration 4 ~ 6 h, stop aeration after, then process the mud that comes off from film;
(4) the anti-cleaning step of acid hydrogenperoxide steam generator of repeating step (3);
(5) the anti-cleaning step of clear water of repeating step (2) then;
(6) be that the 300ppm-500ppm liquor natrii hypochloritis carries out backwash by backwashing system implantation concentration in the membrane module again, injection rate is that every film 20L liquor natrii hypochloritis is left standstill and soaked 12 ~ 16 h; After immersion is finished, membrane module is carried out the high strength aeration, gas-water ratio maintains 45:1 ~ 75:1, each units alternately aeration 4 ~ 6 h, stop aeration after, process the mud that comes off from film;
(7) whole system is continued aeration 12-24 hour, then whole system cleaning situation is detected assessment, take the entire system water-flowing amount return to initial water-flowing amount more than 80% as qualified; Wherein said membrane module is 12m
2/ sheet polypropylene hollow fiber curtain type membrane.
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| CN107789990B (en) * | 2017-12-01 | 2020-12-15 | 昆明滇池水务股份有限公司 | Cleaning method for buried membrane module device |
| CN110314555B (en) * | 2019-07-26 | 2022-01-04 | 东莞东元环境科技股份有限公司 | Cleaning agent and cleaning method for developing solution filter |
| US20220134293A1 (en) * | 2020-10-30 | 2022-05-05 | Entegris, Inc. | Low metal content polyolefin filter membrane |
| CN113101811B (en) * | 2021-05-27 | 2022-06-07 | 成都市排水有限责任公司 | Recovery cleaning method for MBR hollow fiber membrane |
| CN114956312A (en) * | 2022-04-07 | 2022-08-30 | 天津美天水环境科技有限公司 | Method for cleaning membrane of MBR system for aldehyde-containing wastewater and preventing scaling |
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| CN101031351A (en) * | 2004-08-04 | 2007-09-05 | 美国废水过滤集团公司 | Chemicals and method for cleaning film |
| CN101125281A (en) * | 2007-06-12 | 2008-02-20 | 天津膜天膜工程技术有限公司 | Immersion type hollow fiber membrane separator and its running process |
| CN101829505A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Chemical cleaning method of hollow fiber membrane and device thereof |
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| JP2000051672A (en) * | 1998-08-12 | 2000-02-22 | Mitsubishi Rayon Co Ltd | Membrane separator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031351A (en) * | 2004-08-04 | 2007-09-05 | 美国废水过滤集团公司 | Chemicals and method for cleaning film |
| CN101125281A (en) * | 2007-06-12 | 2008-02-20 | 天津膜天膜工程技术有限公司 | Immersion type hollow fiber membrane separator and its running process |
| CN101829505A (en) * | 2009-03-09 | 2010-09-15 | 江西金达莱环保研发中心有限公司 | Chemical cleaning method of hollow fiber membrane and device thereof |
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| JP特开2000-51672A 2000.02.22 |
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