CN102718359A - MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method - Google Patents

MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and membrane component cleaning method Download PDF

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CN102718359A
CN102718359A CN2012101938852A CN201210193885A CN102718359A CN 102718359 A CN102718359 A CN 102718359A CN 2012101938852 A CN2012101938852 A CN 2012101938852A CN 201210193885 A CN201210193885 A CN 201210193885A CN 102718359 A CN102718359 A CN 102718359A
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pond
water
sludge
membrane bioreactor
membrane
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CN102718359B (en
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陈吕军
李荧
郑炜
李伟
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ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT Co Ltd
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ZHEJIANG SHUANGYI ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT Co Ltd
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Abstract

The invention discloses an MBR (membrane bioreactor)-based system and method for oil refining wastewater biochemical treatment and a membrane component cleaning method. A biochemical treatment system comprises an aerobic aeration tank, a middle sedimentation tank, an anoxic tank and a membrane bioreactor. The aerobic aeration tank allows pretreated oil refining wastewater to enter, and the middle sedimentation tank connected with the aerobic aeration tank is used for separation mud and water in the aerobic aeration tank to enable part of sludge to be discharged and part of precipitated sludge to flow back into the aerobic aeration tank. The anoxic tank is connected with the middle sedimentation tank, supernatant in the middle sedimentation tank enters the anoxic tank for denitrification, and the membrane bioreactor which forms an organic pollutant main removing unit is connected with the anoxic tank. The MBR system membrane component cleaning method includes: air scrubbing, online backwashing, online chemical cleaning and offline cleaning, especially online cleaning adopts high-concentration NaClO solution and low-concentration NaClO solution alternately, and offline cleaning adopts sodium dodecyl sulfate and sodium carbonate solution for cleaning or NaClO solution for cleaning.

Description

Based on the refinery water biochemical treatment system of MBR and the purging method of treatment process and membrane module
Technical field
What the present invention relates to is a kind of based on the refinery water biochemical treatment system of film-bioreactor (MBR) technology and the purging method of treatment process and membrane module; Be used for the biochemical processing process of the advanced treatment and reclamation of oil refinery industry refinery water, belong to water-treatment technology field.
Background technology
Oil occupies critical role as a kind of strategic resource in the national economic development; But all can produce great amount of wastewater in the exploitation of oil and the petroleum refining process; Especially in petroleum refining process; Need to crude oil dewater, processing such as desalination, in this process, can produce a large amount of complicated components, oleaginousness is high, saltiness is high, the waste water of biodegradability difference.While is according to development strategy and the petroleum chemical enterprise objective requirement to economizing on water of national energy-saving and emission-reduction; Petroleum chemical enterprise not only needs the continuous decrease pollutant emission; Also need the conserve water resource, increase the water cycle rate of utilization, therefore; Petroleum chemical enterprise has higher requirement for waste water reclaiming, and is at present comparatively advanced and to use more waste water advanced treatment recovery technology be main with membrane separation technique.
Film-bioreactor (MBR) is compared with traditional technology as the combination of membrane separation technique and traditional activated sludge process, and it is little that MBR has floor space; Pollutants removal rate is high; Sludge concentration is high, mud age is long and sludge output is few, but produces water water quality well and reuse, strong shock resistance; Advantages such as ratio is more flexible have obtained paying attention to and using in petrochemical wastewater is handled gradually.General oil Petrochemical Enterprises is carried out the shunting of branch matter and is handled for its factory effluent from the source, form two big types of oily(waste)water and brine wastes.The oily(waste)water low salinity under the situation that does not need desalinating process, can reach reuse standard through advanced treatment process.To oily(waste)water, petroleum chemical enterprise generally adopts the mode of pre-treatment+A/O biochemical treatment+BAF+strainer+gac; And adopt MBR technology, and shortened treatment scheme greatly, form the technical process of pre-treatment+A/O/MBR biochemical treatment, have remarkable advantages at aspects such as floor space, processing efficiencies.Therefore, have more petroleum chemical enterprise to adopt MBR technology as advanced treatment recycling technique at home, mainly contain: Nanjing refinery branch office of (1) China Petrochemical Industry refinery water is handled and reuse first phase of construction, treatment scale 6000m 3/ d; (2) China Petrochemical Industry Nanjing refinery branch office refinery water is handled and the reuse the second stage of the project, treatment scale 6000m 3/ d; (3) China Petrochemical Industry's Guangzhou Branch refinery water is handled and reuse project, treatment scale 7200m 3/ d; (4) China Petrochemical Industry Hainan refinery company refinery water is handled and reuse project, treatment scale 15000 m 3/ d; (5) CNOOC Huizhou refinery company refinery water is handled and reuse project, treatment scale 15000m 3/ d; (6) PetroChina Company Limited.'s Harbin Petrochemical Company refinery water is handled and reuse project, treatment scale 10000 m 3/ d.
But adopt MBR art breading petrochemical refining waste water, main difficult point is that controlling diaphragm pollutes speed, keeps membrane flux and set up effective film purging method.The wetting ability processing can be carried out in MBR mould material surface, and owing to the existence of a large amount of oil materials in the refinery water can be quickened the film pollution level.Therefore, waste water gets into the preceding oil removing pretreatment technology that can adopt two-stage oil removal+cavitation air flotation+air-dissolving air-float of MBR technology.Pass through pretreatment technology; The petroleum content that gets into biochemical treatment can be lower than below the 15mg/L, but because the unstable of the variation water quality of refinery water big (receive crude oil batch influence), air supporting operation etc. are original, often causes the petroleum content that gets into the MBR biochemical treatment system to reach 20mg/L; Even more than the 30mg/L; Cause irreversible film to pollute to mould material, accelerated film and polluted speed, shortened the mould material life-span.Through discovering, a large amount of petroleum substances all is adsorbed on the mud because molten water-based is relatively poor; Caused the change of sludge character, found in practice, the film surface can adhere to more mud; After carrying out flushing with clean water, the mould material surface still has oily matter to adhere to.Simultaneously, the oiliness pollutent generally need adopt alkaline matter to clean, but stronger alkalescence can cause the damage on mould material surface, so the selection of film purging method is to guarantee one of key that membrane flux is stable.To sum up, how through process optimization, reducing oily matter and adhere to, and set up effective film purging method, is the key that guarantees the operation of MBR process stabilizing.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists; A kind of what be used for that refinery water handles is the refinery water biochemical treatment system and the treatment process based on MBR of core with membrane bioreactor (MBR) and provide; Through the optimization of biochemical treatment flow process, alleviate the film pollution level.
Another object of the present invention provides a kind of purging method that is used for the MBR membrane module of refinery water processing, has good restorability to guarantee mould material, guarantees stable membrane flux.
For realizing the foregoing invention purpose; The present invention adopts following technical scheme: a kind of refinery water biochemical treatment system based on MBR; This system is made up of aerobic aeration pond, intermediate sedimentation pond, anoxic pond and film-bioreactor; Described aerobic aeration pond supplies to get into through pretreated refinery water, and a large amount of oily substances are attracted on the mud in the aerobic aeration pond; The intermediate sedimentation pond that links to each other after the said aerobic aeration pond, this intermediate sedimentation pond get rid of the part of precipitating sludge the mud-water separation in aerobic aeration pond, and partial reflux is in the aerobic aeration pond; Be connected with anoxic pond after the intermediate sedimentation pond, the supernatant in the intermediate sedimentation pond gets into anoxic pond and carries out denitrification; After said anoxic pond, be connected with and constitute organic pollutants and mainly remove the unit; To guarantee that effluent index reaches the membrane bioreactor of replenishment cycles water coolant standard; This membrane bioreactor mainly is made up of aeration zone and film district; Said membrane bioreactor adopts long sludge age and higher sludge concentration, and is provided with return line between described membrane bioreactor and the said anoxic pond, makes the mixed-liquor return in the membrane bioreactor carry out denitrification denitrogenation to said anoxic pond.
Described aerobic aeration pond disposes the Aerobic Pond Aeration fan to the mikrobe oxygen supply, and the inlet pipe of said Aerobic Pond Aeration fan is arranged in the bottom in aerobic aeration pond; Described aeration zone disposes the aeration zone blower fan to the active sludge oxygen supply, and the tracheae of said aeration zone blower fan is arranged in the bottom, aeration zone; Described film district also disposes the film district blower fan that oxygen supply and air turbulence are used.
Described film is equipped with membrane module in the district, and said membrane module adopts tubular fibre PVDF curtain type film assembly, pore size filter 0.02 μ m, membrane flux 15 L/m 2H; Described film district also disposes the film that treated clear water suction is got into clean water basin and goes out water pump; Described aerobic aeration pond disposes carries out pretreated oil removal, cavitation air flotation and air-dissolving air-float wastewater treatment equipment to refinery water.
A kind of treatment process of utilizing above-mentioned refinery water biochemical treatment system based on MBR; This treatment process is: described through the refinery water entering aerobic aeration pond after oil removal+cavitation air flotation+air-dissolving air-float processing; Sewage also gets into the aerobic aeration pond after removing large particulate matter and suspended substance through the hand basket grid, and sewage can bring ectogenic bacterial population; Give the mikrobe oxygen supply through the Aerobic Pond Aeration fan, but keep hypoxia, promptly dissolved oxygen is lower than 1mg/L, and the oxygen animalcule growth helps holding concurrently; The mud that is adsorbed with oily substance carries out mud-water separation in the intermediate sedimentation pond, and supernatant gets into anoxic pond; The sludge part that precipitates refluxes, and to keep the sludge concentration in aerobic aeration pond, part is with outside the excess sludge form discharge system, to guarantee the ability of sludge absorption oily substance; The anoxic pond function is mainly carried out denitrification, because the aerobic aeration pond residence time is short, nitrifier can't grow, and mud mixed liquid is back to anoxic pond from membrane bioreactor, carries out denitrification denitrogenation, adopts diving mixer to guarantee the mixing uniformity of system; The anoxic pond water outlet gets into membrane bioreactor, and membrane bioreactor keeps low load condition, and sludge loading is 0.06kgBOD 5/ kgMLSSd regularly through excess sludge discharge pump discharging excess sludge, keeps sludge concentration at 6 ~ 10g/L; Go out the water pump suction through film, treated clear water gets into clean water basin through the reuse of reuse water water supplying pump, and mud is trapped within the reaction tank.
The hydraulic detention time in described aerobic aeration pond is 0.2 ~ 0.8h, and HRT is controlled at 30 ~ 40min; Sludge age is 0.5 ~ 1d, and sludge loading adopts 2 ~ 6kgBOD 5/ kgMLSSd, mud can form the microbial population of short, active strong, high adsorption capacity generation time thus, and water-fast a large amount of oily substances are attracted in the mud; For controlling the normal operation in said aerobic aeration pond, the assurance system moves under the hypoxemia situation, and control dissolved oxygen (DO) carries out at 0.5 ~ 1mg/L.
Described anoxic pond is being carried out denitrification denitrogenation, and HRT is controlled at 2.0h, and return current ratio of the mixed liquid is 100 ~ 200%; Described membrane bioreactor is at the underrun state, and organic loading is 0.05 ~ 0.1kgBOD 5/ kgMLSSd; Membrane bioreactor adopts long sludge age, reaches 15 ~ 20d, and keeps sludge concentration 6 ~ 10g/L, the sludge concentration of superelevation will be unfavorable for that film pollutes control.
A kind of purging method of membrane module of aforesaid membrane bioreactor, described purging method comprises: air bump rinse operation, online backflushing are washed, online matting and off-line clean.
Described online backflushing washing method is: membrane bioreactor 4 operation suction 8min, stop 1min, and when out of service, only carry out aeration, the film silk is carried out air purge; Every 16min, online backflushing wash 1 time, and backwashing time 1min, back flushing flow are 2 times of filtering traffics, and backwashing pressure is lower than 50kPa.
Described online chemical cleaning method is: membrane bioreactor adopts high and low concentration NaClO solution to carry out the online alternately cleaning of chemistry; Carry out adopting for 1 time 0.5 ‰ NaClO low concentration solutions chemistry on-line cleaning weekly, every 15d adopts 3 ‰ NaClO highly concentrated solutions to carry out chemical on-line cleaning 1 time.
Described off-line cleaning method, it is: membrane bioreactor carries out 1 time the off-line matting 4 every half a years, and membrane module soaks 8h in the soda ash solution of 0.5% sodium laurylsulfonate and 0.5%, put into 3 ‰ NaClO solution again and soak 12h.
Beneficial effect of the present invention is embodied in:
(1) aerobic aeration pond (system O1 section) is in the running status of high loading, short sludge age, and mikrobe has very strong adsorptive power.This system mikrobe is removed organic pollutant with the effect of catching etc. of flocculation, deposition, net, and therefore, a large amount of oily substances will be adsorbed and remove, and pollutes speed thereby can slow down the MBR film greatly.
(2) aerobic aeration pond (system O1 section) microorganism active is strong, the phase is short from generation to generation, flexibility is strong, has stronger impact resistance and restorability, has adaptive faculty preferably for the bigger refinery water of variation water quality.
(3) aerobic aeration pond (system O1 section) is under hypoxemia even the anoxic running status simultaneously, and double oxygen animalcule can be converted into the material that is prone to degraded with the part hardly degraded organic substance, is beneficial to subsequent biological treatment technology.
(4) the MBR system is under the underrun state, has higher sludge concentration, can guarantee good effluent quality, under the condition that shortens treatment scheme, directly reaches the purpose of advanced treatment and reclamation.
(5) for guaranteeing the normal operation of MBR system; Set up the effective film of a cover and cleaned strategy; Effectively controlling diaphragm pollutes: air bump rinse operation and online backflushing are washed effectively reducing the absorption of grease material on the film silk, and the online matting may command microbial metabolites that high-concentration and low-concentration is lower is stifled to the dirt of film silk, and combines the refinery water characteristics; Need to adopt special weakly alkaline solution that membrane module is carried out off-line and clean, the effectively greasy pollution of control.
Description of drawings
Fig. 1 is to be the sewage treatment technology process figure of petrochemical refining of core with membrane bioreactor (MBR).
Fig. 2 adopts O/A/O+MBR biochemical processing process COD to remove situation.
Fig. 3 is the variation diagram that adopts O/A/O+MBR biochemical processing process petroleum content.
Fig. 4 is after adopting said film to clean strategy, the film group water production rate of MBR long-time running and the variation diagram of mould difference.
Label among the figure: aerobic aeration pond 1; Intermediate sedimentation pond 2; Anoxic pond 3; Membrane biological reaction pond 4; Aeration zone 5; Film district 6; Film service sink 7; Clean water basin 8; Chemicals dosing plant 9; Hand basket grid 10; Aerobic Pond Aeration fan 11; Aeration zone blower fan 12; Diving mixer 13; Film district blower fan 14; Membrane module 15; Mixed-liquor return pump 16; Excess sludge discharge pump 17; Film service sink discharging of waste liquid pump 18; Film goes out water pump 19; Backwashing pump 20; Chemical cleaning pump 21; Reuse water pump 22; Volume pump 23.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.Shown in Figure 1; A kind of refinery water biochemical treatment system based on MBR; This system is made up of aerobic aeration pond 1, intermediate sedimentation pond 2, anoxic pond 3 and membrane bioreactor 4; Described aerobic aeration pond 1 supplies to get into through pretreated refinery water, and a large amount of oily substances are attracted on the mud in the aerobic aeration pond 1; The intermediate sedimentation pond 2 that links to each other after the said aerobic aeration pond 1, this intermediate sedimentation pond 2 get rid of the part of precipitating sludge the mud-water separation in aerobic aeration pond 1, and partial reflux is in aerobic aeration pond 1; Be connected with anoxic pond 3 after the intermediate sedimentation pond 2, the supernatant in the intermediate sedimentation pond 2 gets into anoxic pond 3 and carries out denitrification; After said anoxic pond 3, be connected with and constitute organic pollutants and mainly remove the unit, reach the membrane bioreactor 4 of replenishment cycles water coolant standard to guarantee effluent index; This membrane bioreactor 4 mainly is made up of with film district 6 aeration zone 5; Said membrane bioreactor 4 adopts long sludge age and higher sludge concentration; And be provided with return line between described membrane bioreactor 4 and the said anoxic pond 3, make the mixed-liquor return in the membrane bioreactor 4 carry out denitrification denitrogenation to said anoxic pond 3.
Described aerobic aeration pond 1 disposes the Aerobic Pond Aeration fan 11 to the mikrobe oxygen supply, and the inlet pipe of said Aerobic Pond Aeration fan 11 is arranged in the bottom in aerobic aeration pond 1; Described aeration zone 5 disposes the aeration zone blower fan 12 to the active sludge oxygen supply, and the tracheae of said aeration zone blower fan 12 is arranged in 5 bottoms, aeration zone; Described film district 6 also disposes the film district blower fan that oxygen supply and air turbulence are used.
In the described film district 6 membrane module 15 is installed, said membrane module 15 adopts tubular fibre PVDF curtain type film assembly, pore size filter 0.02 μ m, membrane flux 15 L/m 2H; Described film district also disposes the film that treated clear water suction is got into clean water basin and goes out water pump; Described aerobic aeration pond disposes carries out pretreated oil removal, cavitation air flotation and air-dissolving air-float wastewater treatment equipment to refinery water.
A kind of treatment process of utilizing above-mentioned refinery water biochemical treatment system based on MBR; This treatment process is: described through the refinery water entering aerobic aeration pond 1 after oil removal+cavitation air flotation+air-dissolving air-float processing; Sewage also gets into aerobic aeration pond 1 after removing large particulate matter and suspended substance through the hand basket grid, and sewage can bring ectogenic bacterial population; Give the mikrobe oxygen supply through Aerobic Pond Aeration fan 11, but keep hypoxia, promptly dissolved oxygen is lower than 1mg/L, and the oxygen animalcule growth helps holding concurrently; The mud that is adsorbed with oily substance 2 carries out mud-water separation in the intermediate sedimentation pond, and supernatant gets into anoxic pond 3; The sludge part that precipitates refluxes, and to keep the sludge concentration in aerobic aeration pond 1, part is with outside the excess sludge form discharge system, to guarantee the ability of sludge absorption oily substance; Anoxic pond 3 functions are mainly carried out denitrification, because 1 residence time of aerobic aeration pond is short, nitrifier can't grow, and mud mixed liquid is back to anoxic pond 3 from membrane bioreactor 4, carries out denitrification denitrogenation, adopt diving mixer to guarantee the mixing uniformity of system; Anoxic pond 3 water outlets get into membrane bioreactor 4, and membrane bioreactor 4 keeps low load condition, and sludge loading is 0.06kgBOD 5/ kgMLSSd regularly through excess sludge discharge pump discharging excess sludge, keeps sludge concentration at 6 ~ 10g/L; Go out the water pump suction through film, treated clear water gets into clean water basin through the reuse of reuse water water supplying pump, and mud is trapped within the reaction tank.
The hydraulic detention time in described aerobic aeration pond 1 is 0.2 ~ 0.8h, and HRT is controlled at 30 ~ 40min; Sludge age is 0.5 ~ 1d, and sludge loading adopts 2 ~ 6kgBOD 5/ kgMLSSd, mud can form the microbial population of short, active strong, high adsorption capacity generation time thus, and water-fast a large amount of oily substances are attracted in the mud; For controlling the normal operation in said aerobic aeration pond 1, the assurance system moves under the hypoxemia situation, and control dissolved oxygen (DO) carries out at 0.5 ~ 1mg/L.
Described anoxic pond 3 is being carried out denitrification denitrogenation, and HRT is controlled at 2.0h, and return current ratio of the mixed liquid is 100 ~ 200%; Described film-bio-reactor is at the underrun state, and organic loading is 0.05 ~ 0.1kgBOD 5/ kgMLSSd; Film-bio-reactor adopts long sludge age, reaches 15 ~ 20d, and keeps sludge concentration 6 ~ 10g/L, the sludge concentration of superelevation will be unfavorable for that film pollutes control.
A kind of purging method of membrane module 15 of aforesaid membrane bioreactor, described purging method comprises: air bump rinse operation, online backflushing are washed, online matting and off-line clean.
Described online backflushing washing method is: membrane bioreactor 4 operation suction 8min, stop 1min, and when out of service, only carry out aeration, the film silk is carried out air purge; Every 16min, online backflushing wash 1 time, and backwashing time 1min, back flushing flow are 2 times of filtering traffics, and backwashing pressure is lower than 50kPa.
Described online chemical cleaning method is: membrane bioreactor 4 adopts high and low concentration NaClO solution to carry out the online alternately cleaning of chemistry; Carry out lower concentration chemistry on-line cleaning weekly 1 time; Promptly adopt 0.5 ‰ NaClO solution; Every 15d carries out high density chemistry on-line cleaning 1 time, promptly adopts 3 ‰ NaClO solution.
Described off-line cleaning method is: membrane bioreactor carries out 1 time the off-line matting 4 every half a years, and membrane module soaks 8h in the soda ash solution of 0.5% sodium laurylsulfonate and 0.5%, put into 3 ‰ NaClO solution again and soak 12h.
Embodiment:
Refinery water through after oil removal+cavitation air flotation+air-dissolving air-float processing gets into aerobic aeration pond 1, and sewage also gets into aerobic aeration pond 1 after removing large particulate matters and suspended substance through hand basket grid 10, and sewage can bring ectogenic bacterial population.Aerobic aeration pond 1 hydraulic detention time (HRT) is 0.5h, and sludge age is 0.5d, and sludge loading is 3 kgBOD 5/ kgMLSSd, mud can form the microbial population of short, active strong, high adsorption capacity generation time thus, and water-fast a large amount of oily substances are attracted in the mud.Give the mikrobe oxygen supply through Aerobic Pond Aeration fan 11, but keep hypoxia (dissolved oxygen is lower than 1mg/L), the oxygen animalcule growth helps holding concurrently.The mud that is adsorbed with oily substance 2 carries out mud-water separation in the intermediate sedimentation pond, and supernatant gets into anoxic pond 3.The sludge part that precipitates refluxes, and to keep the sludge concentration in aerobic aeration pond 1, part is with outside the excess sludge form discharge system, to guarantee the ability of sludge absorption oily substance.
Anoxic pond 3 functions are mainly carried out denitrification; Because 1 residence time of aerobic aeration pond is short, nitrifier can't grow, and mud mixed liquid is back to anoxic pond 3 from membrane biological reaction pond 4; Carry out denitrification denitrogenation, adopt diving mixer 13 to guarantee the mixing uniformity of system.Anoxic pond 3 water outlets get into membrane biological reaction pond 4, and membrane biological reaction pond 4 is made up of aeration zone 5 and film district 6.Membrane biological reaction pond 4 keeps low load condition, and sludge loading is 0.06kgBOD 5/ kgMLSSd regularly through excess sludge discharge pump 17 discharging excess sludges, keeps sludge concentration at 6 ~ 10g/L.Give the active sludge oxygen supply of MBR aeration zone by aeration zone blower fan 12, to satisfy the microorganism growth needs.Give the district's oxygen supply of MBR film by film district blower fan 14, except that satisfying the microorganism growth needs, major function is by air turbulence film silk, prevents a large amount of adhesions of mud on the film silk.The core in membrane biological reaction pond 4 is membrane modules 15, and membrane module 15 adopts tubular fibre PVDF curtain type film assembly, pore size filter 0.02 μ m, membrane flux 15 L/m 2H.Go out water pump 19 suctions through film, treated clear water gets into clean water basin through the 22 water supply reuses of reuse water pump, and mud is trapped within the reaction tank.
Membrane module 15 adopts operation 8min, stops the operating method of 1min, out of service during, the film silk is carried out air bump rinse operation.Every 16min carries out online backflushing by 20 backwashing pumps to membrane module 15 and washes backwashing time 1min.Carry out lower concentration chemistry on-line cleaning (0.5 ‰ NaClO solution) weekly 1 time; Every 15d carries out high density chemistry on-line cleaning (3 ‰ NaClO solution) 1 time; Cleaning way: the chlorine bleach liquor by 9 chemicals dosing plants through volume pump 23 with after clear water that chemical cleaning pump 21 is squeezed into mixes, entering membrane module 15 carries out online matting.Every half a year, membrane module 15 carried out the off-line matting 1 time; Membrane module 15 carries out off-line at film service sink 7 and cleans; Earlier in 0.5% sodium laurylsulfonate and 0.5% soda ash solution, soak 8h, discharge the cleaning waste liquid, in 3 ‰ NaClO solution, soak 12h again through film service sink 18 discharging of waste liquid pumps.
Fig. 2 has shown that O/A/O+MBR biochemical processing process COD removes situation.Certain case history has been carried out secular operation to be followed the tracks of; After as can be seen from the figure passing through the air supporting pre-treatment, the waste water COD fluctuation that gets into aerobic aeration pond 1 is still bigger, between 100 ~ 800mg/L, changes; COD average out to 354mg/L; And O/A/O+MBR has good COD and removes efficient, water outlet COD average out to 41mg/L, can be stable remain on below the 60mg/L.
Fig. 3 has shown the variation diagram with O/A/O+MBR biochemical processing process petroleum content.Can find out by figure; Through after the air supporting pre-treatment, the petroleum content of waste water still has bigger fluctuation, and major cause is to receive crude oil batch to influence; Waste water quality changes greatly; Air supporting simultaneously often occurs uncertain in operation, like problems such as dosing quantitative changeization, pore obstructions, cause the petroleum content of water outlet to change greatly.And the setting through aerobic aeration O1 section, under the situation of air supporting water outlet petroleum content average out to 18.3mg/L, O1 section water outlet petroleum content average out to 4.77mg/L, and very stable.After MBR handled, the petroleum content average out to 1.02mg/L of last water outlet can satisfy the requirement of replenishment cycles water coolant.
Fig. 4 has shown the variation diagram of the film group water production rate and the mould difference of MBR long-time running.Membrane module 15 adopts tubular fibre PVDF curtain type film assembly, pore size filter 0.02 μ m, design membrane flux 15 L/m 2H has 4 series membranes assemblies, adopts the constant current operation mode.In reaching 7 months run duration, tangible decline does not appear in membrane flux.The mould difference progressively rises from initial 22kPa, through 5 months operation, keeps during this that air bump rinse operation, online backflushing are washed, high-concentration and low-concentration replaces chemical on-line cleaning.When the mould difference rises to 50kPa, to carry out off-line this moment and clean, the mould difference returns to 25kPa, and membrane module running condition is good.

Claims (10)

1. refinery water biochemical treatment system based on MBR; This system is made up of aerobic aeration pond, intermediate sedimentation pond, anoxic pond and membrane bioreactor; It is characterized in that described aerobic aeration pond (1) supplies to get into through pretreated refinery water, and a large amount of oily substances are attracted on the mud in the aerobic aeration pond (1); The intermediate sedimentation pond (2) that said aerobic aeration pond (1) links to each other afterwards, this intermediate sedimentation pond (2) get rid of the part of precipitating sludge the mud-water separation of aerobic aeration pond (1), and partial reflux is in aerobic aeration pond (1); Intermediate sedimentation pond (2) is connected with anoxic pond (3) afterwards, and the supernatant in intermediate sedimentation pond (2) gets into anoxic pond (3) and carries out denitrification; Be connected with afterwards in said anoxic pond (3) and constitute organic pollutants and mainly remove the unit, reach the membrane bioreactor of replenishment cycles water coolant standard (4) to guarantee effluent index; This membrane bioreactor (4) mainly is made up of with film district (6) aeration zone (5); Said membrane bioreactor (4) adopts long sludge age and higher sludge concentration; And be provided with return line between described membrane bioreactor (4) and the said anoxic pond (3), make the mixed-liquor return in the membrane bioreactor (4) carry out denitrification denitrogenation to said anoxic pond (3).
2. the refinery water biochemical treatment system based on MBR according to claim 1; It is characterized in that described aerobic aeration pond (1) disposes the Aerobic Pond Aeration fan (11) to the mikrobe oxygen supply, and the inlet pipe of said Aerobic Pond Aeration fan (11) is arranged in the bottom of aerobic aeration pond (1); Described aeration zone (5) disposes the aeration zone blower fan (12) to the active sludge oxygen supply, and the tracheae of said aeration zone blower fan (12) is arranged in bottom, aeration zone (5); Described film district (6) also disposes the film district blower fan (14) that oxygen supply and air turbulence are used.
3. the refinery water biochemical treatment system based on MBR according to claim 1 and 2; It is characterized in that being equipped with in the described film district (6) membrane module (15); Said membrane module (15) adopts tubular fibre PVDF curtain type film assembly, pore size filter 0.02 μ m, membrane flux 15 L/m 2H; Described film district (6) also disposes the film that treated clear water suction is got into clean water basin and goes out water pump (19); Described aerobic aeration pond (1) disposes carries out pretreated oil removal, cavitation air flotation and air-dissolving air-float wastewater treatment equipment to refinery water.
4. treatment process of utilizing claim 1 or 2 or 3 described refinery water biochemical treatment systems based on MBR; It is characterized in that described through the refinery water entering aerobic aeration pond (1) after oil removal+cavitation air flotation+air-dissolving air-float processing; Sewage also gets into aerobic aeration pond (1) after removing large particulate matter and suspended substance through hand basket grid (10), and sewage can bring ectogenic bacterial population; Give the mikrobe oxygen supply through Aerobic Pond Aeration fan (11), but keep hypoxia, promptly dissolved oxygen is lower than 1mg/L, and the oxygen animalcule growth helps holding concurrently; The mud that is adsorbed with oily substance carries out mud-water separation in intermediate sedimentation pond (2), and supernatant gets into anoxic pond (3); The sludge part that precipitates refluxes, and to keep the sludge concentration in aerobic aeration pond (1), part is with outside the excess sludge form discharge system, to guarantee the ability of sludge absorption oily substance; Anoxic pond (3) function is mainly carried out denitrification; Because aerobic aeration pond (1) residence time is short; Nitrifier can't grow; Mud mixed liquid is back to anoxic pond (3) from membrane bioreactor (4), carries out denitrification denitrogenation, adopt diving mixer (13) to guarantee the mixing uniformity of system; Anoxic pond (3) water outlet gets into membrane bioreactor (4), and membrane bioreactor (4) keeps low load condition, and sludge loading is 0.06kgBOD 5/ kgMLSSd regularly through excess sludge discharge pump (17) discharging excess sludge, keeps sludge concentration at 6 ~ 10g/L; Go out water pump (19) suction through film, treated clear water gets into clean water basin through reuse water pump (22) water supply reuse, and mud is trapped within the reaction tank.
5. the refinery water biochemical processing method based on MBR according to claim 4 is characterized in that the hydraulic detention time in described aerobic aeration pond (1) is 0.2 ~ 0.8h, and HRT is controlled at 30 ~ 40min; Sludge age is 0.5 ~ 1d, and sludge loading adopts 2 ~ 6kgBOD 5/ kgMLSSd, mud can form the microbial population of short, active strong, high adsorption capacity generation time thus, and water-fast a large amount of oily substances are attracted in the mud; For controlling the normal operation in said aerobic aeration pond, the assurance system moves under the hypoxemia situation, and the control dissolved oxygen carries out at 0.5 ~ 1mg/L.
6. the refinery water biochemical processing method based on MBR according to claim 4 is characterized in that described anoxic pond carrying out denitrification denitrogenation, and HRT is controlled at 2.0h, and return current ratio of the mixed liquid is 100 ~ 200%; Described membrane bioreactor (4) is at the underrun state, and organic loading is 0.05 ~ 0.1kgBOD 5/ kgMLSSd; Membrane bioreactor (4) adopts long sludge age, reaches 15 ~ 20d, and keeps sludge concentration 6 ~ 10g/L, the sludge concentration of superelevation will be unfavorable for that film pollutes control.
7. purging method like the membrane module of claim 4 or 6 described membrane bioreactors is characterized in that described purging method comprises: air bump rinse operation, online backflushing are washed, online matting and off-line clean.
8. the purging method of the membrane module of film-bio-reactor according to claim 7 is characterized in that described online backflushing is washed and is: membrane bioreactor (4) operation suction 8min, stop 1min, and when out of service, only carry out aeration, the film silk is carried out air purge; Every 16min, online backflushing wash 1 time, and backwashing time 1min, back flushing flow are 2 times of filtering traffics, and backwashing pressure is lower than 50kPa.
9. the purging method of the membrane module of membrane bioreactor according to claim 7; It is characterized in that described online matting is: membrane bioreactor (4) adopts high and low concentration NaClO solution to carry out the online alternately cleaning of chemistry; Carry out adopting for 1 time the chemical on-line cleaning of 0.5 ‰ NaClO low concentration solutions weekly, every 15d carries out adopting for 1 time the chemical on-line cleaning of 3 ‰ NaClO highly concentrated solutions.
10. the purging method of the membrane module of membrane bioreactor according to claim 7; It is characterized in that described off-line cleans is: membrane bioreactor (4) carries out 1 time the off-line matting every half a year; Membrane module soaks 8h in the soda ash solution of 0.5% sodium laurylsulfonate and 0.5%, put into 3 ‰ NaClO solution again and soak 12h.
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