CN102145258A - Method for cleaning heavy oil sludge-polluted membrane module - Google Patents

Method for cleaning heavy oil sludge-polluted membrane module Download PDF

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Publication number
CN102145258A
CN102145258A CN2011100379866A CN201110037986A CN102145258A CN 102145258 A CN102145258 A CN 102145258A CN 2011100379866 A CN2011100379866 A CN 2011100379866A CN 201110037986 A CN201110037986 A CN 201110037986A CN 102145258 A CN102145258 A CN 102145258A
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membrane module
membrane
cleaning
aeration
film
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CN102145258B (en
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刘沐之
张霞
王萍
阳震
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TIANJIN TISUN ITASCA TECHNOLOGY Co Ltd
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TIANJIN TISUN ITASCA TECHNOLOGY Co Ltd
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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

The cleaning method of the membrane module that a kind of heavy oil dirt is dyed
Technical field
The invention belongs to technical field of waste water processing, relate to a kind of PP(polypropylene that the heavy oil dirt is dyed that cleans) method of doughnut curtain type film assembly, in particular, be the method that the method for utilizing online clear water backwash and specific concentrations medicament substep to combine is cleaned membrane module.
Background technology
Membrane separation technique is a kind of isolation technics that solution or gaseous matter separate, concentrate and purify that is widely used in.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 big molecule solute tunicle is held back, the purpose that reaches separating substances and concentrate.Adopt membrane technology to carry out pollutant and separate, precious water resource can be carried out the secondary utilization with hydrone.(Membrane Bio-Reactor MBR) is a kind of new kenel Waste Water Treatment with membrane separation technique and biologic treating technique combination to membrane bioreactor.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.The doughnut curtain type film assembly is a kind of membrane module that is specially adapted for built-in membrane bioreactor.
Heavy oil mud is meant by various ingredients such as heavy oil and ordinary activated sludge, the surfactant assorted greasy filth shape mixture together of mixing.Have viscosity big, be difficult to characteristics such as degraded, hydrophily difference.After this heavy oil dirt was dyed curtain type membrane, the one deck that forms on the surface of film mixed the cake layer that forms by heavy oil and activated sludge and inorganic matter, was difficult to be washed away by aeration; The gel layer that also exists simultaneously one deck to form 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 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-fibre membrane silk 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-fibre membrane silk 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 of killing in the fenestra road that grows 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 is washed in the pond process of soaking respectively, cleaning at different medicines after membrane module is taken out from the MBR pond.The medicament that soaks, cleans is generally concentration and is no more than the liquor natrii hypochloritis of 500ppm, 1 ~ 2% NaOH solution, 1 ~ 2% HCl solution or citric acid solution.
For the MBR membrane module that the heavy oil dirt is dyed, 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 bigger, and need the scene to possess ready-made service sink and hanging device, therefore, bigger for treatment scale, the on-the-spot engineering that does not possess cleaning condition, the off-line Chemical cleaning has certain limitation.The membrane module that the medicament counterweight greasy filth of application routine in addition, pollutes carries out soaking and washing and also is difficult to realize comparatively desirable effect.
Summary of the invention
Through a large amount of documents and retrieval proof, China does not have similarly not online the utilize acid hydrogenperoxide steam generator of specific concentrations, liquor natrii hypochloritis so far, combines with high strength aeration substep, and the patent documentation that the PP curtain type membrane that counterweight greasy filth pollutes cleans is delivered.For this reason, the invention provides a kind of method of cleaning the PP membrane module that the heavy oil dirt dyes, the cleaning method that the heavy oil dirt that relates among the present invention is dyed the PP curtain type membrane be understand fully that the heavy oil dirt is dyed and the basis of the characteristics of PP material membrane module on, by utilizing the acid hydrogenperoxide steam generator of specific concentrations, liquor natrii hypochloritis, combine with high strength aeration substep, effectively recover membrane flux, saved lot of manpower and material resources 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:
The cleaning method of the membrane module that a kind of heavy oil dirt is dyed, it is characterized in that it is that 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 that the heavy oil dirt is dyed.
Cleaning method of the present invention, wherein said online clear water backwash are meant by inner the continuing of the online past membrane module of backwash system and inject clear water 4-6h, 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 is meant 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 are meant 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 that the more detailed heavy oil dirt of the present invention is dyed, undertaken by following step:
(1) at first the membrane cisterna liquid level is reduced to and just expose membrane module;
(2) continue to inject clear water in membrane module by the backwash system, injection rate is an 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 the backwash 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, handle the mud that comes off from film then;
(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) carry out backwash by backwash system implantation concentration in the membrane module for the 300ppm-500ppm liquor natrii hypochloritis 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, handle the mud that comes off from film;
(7) whole system is continued aeration 12-24 hour, then whole system cleaning situation is detected assessment, what return to initial water-flowing amount with the entire system water-flowing amount is success more than 80%; 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 is online to add membrane module internally with a certain amount of acid hydrogenperoxide steam generator 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, very big for cleaning action based on the film of organic pollution and microbial contamination.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.The number of times that can wash according to the exact level decision hydrogen peroxide medicine that pollutes in concrete enforcement the and concrete concentration.
The present invention injects a certain amount of liquor natrii hypochloritis at last in membrane module, leave standstill a period of time.The liquor natrii hypochloritis is used for carrying out alkali cleaning, mainly remnants is contained that oil contaminants is cleaned and the adjusting of acid-base value.Last aeration washes away until membrane flux and returns near previous level.
The good effect that the cleaning method that heavy oil dirt disclosed by the invention is dyed curtain type membrane is compared with prior art had is:
(1) heavy oil dirt of the present invention is dyed more efficient quick of curtain type membrane cleaning method, compares with the method for traditional off-line soaking and washing membrane module, has saved lot of manpower and material resources.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) adopt heavy oil dirt of the present invention to dye after the curtain type membrane cleaning method cleaned, curtain type membrane is 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 reduced to and just expose membrane module;
(2) continue to inject clear water in membrane module by the backwash system, injection rate is an 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 the backwash 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, handle the mud that comes off from film then;
(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) carry out backwash by backwash system implantation concentration in the membrane module for the 300ppm liquor natrii hypochloritis 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, handle the mud that comes off from film;
(7) whole system was continued aeration 12 hours, then whole system cleaning situation is detected assessment, with the entire system water-flowing amount return to initial water-flowing amount more than 80% for qualified; Wherein said membrane module is a 12m2/ sheet polypropylene hollow fiber curtain type membrane.
Embodiment 2
(1) at first the membrane cisterna liquid level is reduced to and just expose membrane module;
(2) continue to inject clear water in membrane module by the backwash system, injection rate is an 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 the backwash 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, handle the mud that comes off from film then;
(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) carry out backwash by backwash system implantation concentration in the membrane module for the 500ppm liquor natrii hypochloritis 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, handle the mud that comes off from film;
(7) whole system was continued aeration 18 hours, then whole system cleaning situation is detected assessment, what return to initial water-flowing amount with the entire system water-flowing amount is success more than 80%; Wherein said membrane module is a 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 22 groups of membrane modules altogether, 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 taken place 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 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 the method described in the present invention in this example.Cleaning step is as follows:
(1) the original mud in MBR pond is cleared before cleaning, liquid level is reduced to and is just exposed membrane support and get final product, and stops to aspirate water outlet;
(2) inject clear water by the backwash system in membrane module, injection rate is every film 100L clear water (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, will wash away attached to the relatively poor cake layer of adhesion on film silk surface.Then stop aeration, treat to discharge processing behind the sludge settling in the pond.
(3) carrying out acid first 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 treating that 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 efficiently cleaned.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, handle 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 is injected is 500ppm.Leave standstill and soak 6 h.Aeration method shown in (3) continues aeration 4 h to membrane module then.
(7) after above-mentioned steps is finished, whole system was continued aeration 12 hours.By professional operating personnel whole system cleaning situation is detected assessment then.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 commonly used is than flux recovery rate γ=K/K 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 that 1 group of heavy oil dirt reserving in advance among the embodiment 3 is dyed, 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 back is liquor natrii hypochloritis's immersion of 500ppm by concentration, for realizing the effect with the complete submergence of this part film, in concrete the enforcement, has used 6 tons of cleaning agents.Leave standstill and soak 24 h.
(4) after immersion is finished, handle the mud that comes off, and once more membrane module is continued from inside outwards to inject clear water, continue 2-6 h.Cleaning is finished.Install back original support then.The test membrane flux.
(5) result: single group membrane flux is multiple next time to 2.9 m with equal pressure 3/ h; Film is than flux recovery rate 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 to membrane module with two kinds of medicaments.
Take out the PP curtain type membrane that 1 group of heavy oil dirt reserving in advance among the embodiment 3 is dyed, 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: this group membrane module (132/group) dismounting back is 300ppm by concentration, the adjusting of pH=2(hydrochloric acid) hydrogenperoxide steam generator soaks, for realizing effect, in concrete the enforcement, 6 tons of cleaning agents have been used with the complete submergence of this part film.Leave standstill and soak 24 h.
(4) after immersion is finished, handle the mud that comes off, and once more 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 the effect with the complete submergence of this part film, in concrete the enforcement, has used 6 tons of cleaning agents.Leave standstill and soak 24 h.
(6) after immersion is finished, handle the mud that comes off, and once more membrane module is continued from inside outwards to inject clear water, continue 2 h.Cleaning is finished.Install back original support then.The test membrane flux.
(7) result: single group membrane flux is multiple next time to 5.2 m with equal pressure 3/ h; Film is than flux recovery rate γ=91.22%.
The present invention adopts the acid hydrogenperoxide steam generator of online clear water backwash and specific concentrations, liquor natrii hypochloritis, and the mode of high strength aeration substep combination is cleaned the PP(polypropylene that the heavy oil dirt is dyed) 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, film improves a lot than flux recovery rate, membrane module with one group of 132 film of same cleaning is an example, tradition off-line soaking and washing film is 50.9% than flux recovery rate, 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, though film is 91.22% than flux recovery rate, 92.86% the recovery rate that reaches near the inventive method, but, off-line need expend a large amount of manpowers because cleaning, 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: be example to clean one group of membrane module that contains 132 films, 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 that the heavy oil dirt is dyed 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 prospect.
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 (6)

1. the cleaning method of the membrane module that dyes of a heavy oil dirt, it is characterized in that it is that 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 that the heavy oil dirt is dyed.
2. the described cleaning method of claim 1, wherein said online clear water backwash are meant by online backwash system and inject clear water 4-6h toward inner the continuing of membrane module, membrane module top layer cake layer is come off in a large number.
3. the described cleaning method of claim 1, membrane module wherein is: 12m 2The polypropylene hollow fiber curtain type membrane of/sheet.
4. the described cleaning method of claim 1, acid hydrogenperoxide steam generator concentration wherein is 300ppm, the pH value of solution is 1-2; Liquor natrii hypochloritis's concentration is 500ppm.
5. the described cleaning method of claim 1, heavy oil mud wherein are meant by heavy oil and ordinary activated sludge, the surfactant various ingredients assorted greasy filth shape mixture together of mixing.
6. the described cleaning method of claim 1 is characterized in that being undertaken by following step:
(1) at first the membrane cisterna liquid level is reduced to and just expose membrane module;
(2) continue to inject clear water in membrane module by the backwash system, injection rate is an 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 the backwash 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, handle the mud that comes off from film then;
(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) carry out backwash by backwash system implantation concentration in the membrane module for the 300ppm-500ppm liquor natrii hypochloritis 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, handle the mud that comes off from film;
(7) whole system is continued aeration 12-24 hour, then whole system cleaning situation is detected assessment, with the entire system water-flowing amount return to initial water-flowing amount more than 80% for qualified; Wherein said membrane module is 12m 2/ sheet polypropylene hollow fiber curtain type membrane.
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107789990A (en) * 2017-12-01 2018-03-13 昆明滇池水务股份有限公司 A kind of buried film group device cleaning method
CN109071291A (en) * 2016-04-28 2018-12-21 东丽株式会社 Using the wastewater treatment method of membrane separation activated sludge process
CN110314555A (en) * 2019-07-26 2019-10-11 东莞东元环境科技股份有限公司 A kind of cleaning agent and cleaning method of the liquid filter that develops
CN113101811A (en) * 2021-05-27 2021-07-13 成都市排水有限责任公司 Recovery cleaning method for MBR hollow fiber membrane

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