CN101704620B - MBR purification method and system of domestic grey water - Google Patents

MBR purification method and system of domestic grey water Download PDF

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Publication number
CN101704620B
CN101704620B CN2009102503413A CN200910250341A CN101704620B CN 101704620 B CN101704620 B CN 101704620B CN 2009102503413 A CN2009102503413 A CN 2009102503413A CN 200910250341 A CN200910250341 A CN 200910250341A CN 101704620 B CN101704620 B CN 101704620B
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China
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membrane
district
water
coagulating
sludge
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CN2009102503413A
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Chinese (zh)
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CN101704620A (en
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陈洪斌
唐贤春
何群彪
董滨
屈计宁
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同济大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

Abstract

The invention belongs to the technical field of environmental protection, in particular to an MBR purification method and a system of domestic grey water. The MBR purification method of the domestic grey water comprises two steps: coagulate clarification preprocessing and membrane biological reaction processing. The MBR purification method couples the high-efficiency preprocessing of grey water with low pollution and a membrane bioreactor in the same processing system and has low processing difficulty, little investment cost, small occupied area, easy realization of automatic running and simple management. After being processed, the domestic grey water has favorable water quality stability, can be used as fresh water and is used for water closet flushing, subdistrict greening, vehicle washing or industrial production and the like. In the processing process, the system can automatically run and has outstanding adaptability and impact resistance of the water quality and the water quantity.

Description

Domestic grey water MBR purifying method and system
Technical field
The invention belongs to environmental protection technical field, be specifically related to a kind of domestic grey water MBR purifying method and system.
Background technology
Domestic grey water derives from various bathings, washing and the kitchen waste water of family, the water yield accounts for 70~75% of whole sanitary sewages, pollutent only accounts for about 20% of sanitary sewage, with washing composition (mainly is anionic detergent, LAS), suspended substance and organic matters pollutent be main, the common sanitary sewage of the concentration ratio of nitrogen and phosphorus low about 80%.Domestic grey water is collected advanced treatment on the spot, and direct reuse is in flushing lavatory and greening etc., and not only intractability and cost are low, and contain pathogenetic bacteria etc. hardly, the reuse risk is little, realizes resource utilization when realizing the pollutent minimizing, thus the purpose of saving the energy and resource consumption.Countries such as Europe focus mostly in single family or buildings to the collection of domestic grey water and the research of processing, and adopt means such as simple or Ecological Disposal to realize handling and reuse, be used for a sub-district or a plurality of sub-district but enlarge, have then that floor space is big, facility is many, degree of purification is low, the water quality of reuse water is difficult to problems such as effective assurance.The research that the now existing sewage source of China separates and collects, but setting foot in seldom aspect the processing of buck and the reuse.
Simultaneously,, may form a large amount of foams in the biological treatment process, influence treatment effect because the LAS concentration of domestic grey water is higher; Adopt suitable preprocessing means that its removal is very necessary.Efficient coagulating carrier clarification technique development in recent years is rapid, by coagulating agent and returned sluge, can realize the quick clarification of water.Organic concentration, suspended substance and LAS through buck after the pre-treatment all significantly reduce, and subsequent biological treatment adopts biomembrance process more, and not only floor space is big, and need second pond or filtration unit to remove suspended substance and turbidity, could realize reuse.Membrane bioreactor (MBR) is fast-developing in recent years biological wastewater treatment technology, it is incorporated into bio-oxidation and efficient solid-liquid separation in the structures, small accommodation area, and the water quality of water outlet is good, can direct reuse, and device can be realized the autostable operation.
Highly effective coagulation is clarified pre-treatment and MBR to be merged and is used to handle domestic grey water, can bring into play advantage each other, both reduced the influence of LAS to the subsequent film material, eliminate foam, improve the operation stability of MBR simultaneously, reach good effluent quality, efficient clarification technique fast and MBR applied in any combination still do not have any research and application in domestic grey water advanced treatment and regeneration.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of domestic grey water MBR purifying method and system are provided.MBR purifying method of the present invention is fit to the sub-district buck, hotel, holiday resort of different scales and away from the advanced treatment and the reuse of draining outside the low concentration wastewater of urban drainage pipe network residential district, the industrial enterprise.
The present invention realizes above-mentioned technical purpose by following technique means:
The invention provides a kind of domestic grey water MBR purifying method, comprising: coagulation clarification pre-treatment and membrane biological reaction are handled two steps.
Preferable, described coagulation clarification pre-treatment is carried out in pretreater, and described pretreater comprises coagulating district and efficient settling section, and described coagulating district and efficient settling section connection.
Preferably, be provided with dividing plate in the described pretreater, and pretreater is divided into coagulating district and efficient settling section by this dividing plate, and a side of described dividing plate fixedlys connected with pretreater inwall one side, and leave the space between the opposite side of the opposite side of this dividing plate and pretreater inwall.
Preferably, described coagulating is provided with dividing plate in the district, and by this dividing plate pretreater is divided into dosing mixing section and reaction slaking section; And a side in described coagulating district is provided with water inlet pipe, coagulant dosage device and reflux sludge tube; Described dosing mixing section is provided with the mixing stirring rake, and described reaction slaking section is provided with slow speed of revolution stirring rake; One side of described dividing plate is fixedlyed connected with coagulating district inwall one side, and leaves the space between the opposite side of the opposite side of this dividing plate and coagulating district inwall.
Preferably, described efficient settling section inside is provided with many group swash plates and bed mud slag scraper, and the bottom of described efficient settling section is provided with the bucket district that is used to accept mud, and the bottom in described bucket district is connected with a side of sludge reflux pump through shore pipe, the opposite side of sludge reflux pump and reflux sludge tube and efflux pipe coupling, the opposite side of described reflux sludge tube is connected with the coagulating district, and also is provided with valve between described reflux sludge tube and the sludge reflux pump.
Described bucket district is communicated with the coagulating district by reflux sludge tube; A part of mud in bucket district enters the coagulating district by reflux sludge tube under the effect of return sludge pump, participate in coagulation process, improves coagulating sedimentation efficient; Other excess sludges are collected and aftertreatment by outer comb.
Preferable, described membrane biological reaction is handled and is carried out in membrane bioreactor, and described membrane bioreactor comprises bio-oxidation district and membrane separation zone, and is communicated with the nothing separation fully between described bio-oxidation district and the membrane separation zone.
Preferably, the area of described membrane separation zone is 1/2~1/3 of the membrane bioreactor total area.
Further preferred, described ultra-filtration membrane tripping device is made up of hyperfiltration membrane assembly, and the material of hyperfiltration membrane assembly is that pore diameter range is tunica fibrosa or the flat sheet membrane of 10nm~100nm.
Preferably, bottom, described bio-oxidation district is provided with micro-hole aerator, and described membrane separation zone inside is provided with ultra-filtration membrane tripping device and perforation washpipe; And described ultra-filtration membrane tripping device is connected with vacuum pump by Automatic Control Unit, and described perforation washpipe is connected with the flushing gas blower by the air main.
The effect of described micro-hole aerator is that the microorganism that is used in the bio-oxidation district provides metabolism needed oxygen, and micro-hole aerator is connected with gas blower by the aeration main, can control the size of aeration rate.The effect of described perforation washpipe and flushing gas blower is that the flushing air that gas blower produced is directly washed away membrane module by the perforation washpipe, avoids the film surface to form blocked up mud film, keeps stable membrane flux.Clear water after the ultra-filtration membrane tripping device will be handled by vacuum pump is extracted out.Described Automatic Control Unit links to each other with fluid level controller, and its effect is the automatic switchover that realizes membrane module suction filtration and back flushing state.
Further preferred, also be provided with fluid level controller in the described membrane bioreactor.
The effect of described fluid level controller is operation or the halted state by two position controlling diaphragm assembly.After the clear water gravity flow of efficient settling section entered membrane bioreactor, when liquid level reached the height of setting, fluid level controller was delivered to the ultra-filtration membrane tripping device with indicator signal, indicated it to start working; Along with ultra-filtration membrane tripping device after work for some time, the liquid level in the membrane bioreactor is reduced to setting height, and indication ultra-filtration membrane tripping device quits work, and the water level in the membrane bioreactor can progressively rise, and changes running status when attaining to a high place again over to.Because the fluctuation of the water yield of buck is bigger, can realize in this way coming the flexible of the water yield.
Preferable, described coagulation clarification pre-treatment comprises following concrete steps:
A) domestic grey water is collected the back enters pretreater by water inlet pipe dosing mixing section, buck successively mixes the formation muddy water mixed solution at the dosing mixing section with coagulating agent and returned sluge, and by stirring thorough mixing and the reaction that promotes medicament (the stirring velocity scope is 200-300r/min), returned sluge and water fast, to forming flco;
B) muddy water mixed solution through the thorough mixing reaction steps A) enters reaction slaking section, and promotes flco to grow up by slow speed of revolution stirring rake by the slow stirring to current;
C) gravity flow of the muddy water mixed solution behind the coagulating enters efficient settling section and realizes separating of buck and flco;
D) buck after solid-liquid separation flows in the bio-oxidation district of MBR, and the microbial metabolism of pollutent on active sludge decomposed; Mixed solution after the biological treatment filters water outlet through membrane separation zone.
Preferably, described domestic grey water also needed to tackle big floating matter by grid before carrying out the coagulation clarification pre-treatment.
Preferably, described steps A) coagulating agent in is selected from polymeric aluminum, polymerization iron or double salt high-molecular coagulant adopting, and the concentration that adds of described coagulating agent is 10~30mg/L, and sludge back flow quantity is 3%~5% (volume percent) of flooding quantity.
Preferably, the stirring at low speed speed described step B) is 10~50r/min.
Preferably, described step C) in, the surfaceloadingrate of efficient settling section is 20~60m/h.
Described step C) in, the settling of floccus of the generation after solid-liquid separation is to the bottom of efficient settling section, scrape to sludge bucket and storage by the bed mud slag scraper, participate in the precipitation process of coagulation of buck then by sludge pump, reflux sludge tube, excess sludge regularly discharges by outer comb.
Preferably, described step D) in, be 3~5h through the residence time of the buck after the solid-liquid separation in membrane bioreactor, wherein, the treatment time in the described bio-oxidation district is 2~3h, the hydraulic detention time of described membrane separation zone is 1~2h.
Described step D) in, the clear water after the ultra-filtration membrane tripping device will be handled by vacuum pump is extracted out, and the mode of hyperfiltration membrane assembly operation employing intermittent operation, by the working order of fluid level controller controlling diaphragm assembly; When the operating pressure of vacuum pump or suction filtration time reach set(ting)value, enter the back flushing state automatically; Automatic Control Unit can realize the automatic switchover of membrane module suction filtration and back flushing state; In the membrane bioreactor fluid level controller is installed simultaneously, by the running status or the halted state of two position controlling diaphragm assembly.When liquid level reached the height of setting after the gravity flow of settling pond supernatant liquor enters MBR, fluid level controller was delivered to indicator signal the ultra-filtration membrane tripping device and indicates it to start working; The ultra-filtration membrane tripping device is after work for some time, and the liquid level in the reactor is reduced to setting height, and indication ultra-filtration membrane tripping device quits work, and the water level of reactor progressively rises, and changes running status when attaining to a high place again over to; Because the fluctuation of the water yield of buck is bigger, can realize in this way coming the flexible of the water yield.
Preferable, the concrete steps that described membrane biological reaction is handled are: pretreated water outlet enters in the bio-oxidation district through coagulation clarification, mixes mutually with active sludge, and pollutent is decomposed by microbial metabolism; Filter water outlet through the mixed solution after the biological treatment through membrane separation zone.
Preferably, the mixed liquor suspended solid, MLSS substrate concentration of described mud mixture (MLSS, i.e. mixed lipuor suspendedsolids) is 6~12g/L.
Preferably, the dissolved oxygen (DO value) in the mixed solution behind the described aeration is 2~5mg/L.
The present invention also provides a kind of domestic grey water MBR purification system, and this system comprises pretreater and membrane bioreactor, and passes through pipe connection between described pretreater and these two processing units of membrane bioreactor.
Preferable, described pretreater is divided into coagulating district and efficient settling section by the dividing plate of the incomplete sealing that its inside is provided with.
Preferably, described coagulating district is divided into dosing mixing section and reaction slaking section by the dividing plate of incomplete sealing; And the feed-water end in described coagulating district is provided with water inlet pipe, coagulant filling pipe and reflux sludge tube; Described dosing mixing section is provided with the mixing stirring rake, and described reaction slaking section is provided with slow speed of revolution stirring rake.
Preferably, described efficient settling section inside is provided with many group swash plates and bed mud slag scraper, and the bottom of described efficient settling section is provided with the bucket district that is used to accept mud, and the bottom in described bucket district is connected with a side of sludge reflux pump through shore pipe, the opposite side of sludge reflux pump and reflux sludge tube and efflux pipe coupling, the opposite side of described reflux sludge tube is connected with the coagulating district, and also is provided with valve between described reflux sludge tube and the sludge reflux pump.
Described bucket district is communicated with the coagulating district by reflux sludge tube; A part of mud in bucket district enters the coagulating district by reflux sludge tube under the effect of return sludge pump, participate in coagulation process, improves coagulating sedimentation efficient; Other excess sludges are collected and aftertreatment by outer comb.
Preferable, described membrane bioreactor comprises bio-oxidation district and membrane separation zone, and is communicated with the nothing separation fully between described bio-oxidation district and the membrane separation zone, and the area of described membrane separation zone is 1/2~1/3 of the membrane bioreactor total area.
Preferably, bottom, described bio-oxidation district is provided with micro-hole aerator, and described membrane separation zone inside is provided with ultra-filtration membrane tripping device and perforation washpipe; And described ultra-filtration membrane tripping device is connected with vacuum pump by Automatic Control Unit, and described perforation washpipe is connected with the flushing gas blower by the air main.
Preferably, described ultra-filtration membrane tripping device is made up of hyperfiltration membrane assembly, and the material of hyperfiltration membrane assembly is that pore diameter range is tunica fibrosa or the flat sheet membrane of 10nm~100nm; The filter type of described hyperfiltration membrane assembly is a dead-end filtration, and the perforation washpipe is used for air scour is forced on the membrane module surface, when the running resistance of membrane module is increased to a certain degree or reaches the working time of setting, promptly changes the flushing state over to.
Wherein, the implication of described term " dead-end filtration " is: solvent and see through film less than the solute of fenestra under the driving of pressure, particle greater than fenestra is trapped, usually be deposited on the face, increase along with the time, the particle of piling up on the face is also increasing, and filtration resistance increases, and membrane permeation speed descends.Therefore, dead-end filtration is step, must periodically stop and clean the pollution layer on film surface.
The effect of described micro-hole aerator is that the microorganism that is used in the bio-oxidation district provides metabolism needed oxygen, and micro-hole aerator is connected with gas blower by the aeration main, can control the size of aeration rate.The effect of described perforation washpipe and flushing gas blower is that the flushing air that gas blower produced is washed away membrane module by the perforation washpipe, to avoid the film surface to form blocked up mud film, to keep stable membrane flux.Clear water after the ultra-filtration membrane tripping device will be handled by vacuum pump is extracted out.The effect of described Automatic Control Unit is the automatic switchover that realizes membrane module suction filtration and back flushing state.
Further preferred, also be provided with fluid level controller in the described membrane bioreactor, the effect of described fluid level controller is running status or the halted state by two position controlling diaphragm assembly.When liquid level reached the height of setting after the clear water gravity flow of efficient settling section enters in the membrane bioreactor, fluid level controller was delivered to indicator signal the ultra-filtration membrane tripping device and indicates it to start working; The ultra-filtration membrane tripping device is after work for some time, and the liquid level in the membrane bioreactor is reduced to setting height, and indication ultra-filtration membrane tripping device quits work, and the water level in the membrane bioreactor can progressively rise, and changes running status when attaining to a high place again over to.Because the fluctuation of the water yield of buck is bigger, can realize in this way coming the flexible of the water yield.
Domestic grey water MBR treatment unit described in the present invention is made up of pretreater and MBR reactor, and pretreater comprises coagulating district and efficient settling section, and MBR comprises bio-oxidation district and membrane separation zone, and two processing units pass through pipe connection.The purpose of pretreater is that buck is carried out pre-treatment, reduces the concentration of LAS, suspended substance or colloidal composition, reduces the influence to follow-up bio-reactor and mould material.The coagulating district of pretreater is provided with whipping appts and automatic medicine adding apparatus, also has mud return line in addition; Efficient settling section is furnished with swash plate, sludge bucket and return sludge pump.The MBR reactor is cultivated certain density biomass, and aeration aerating is used for thoroughly removing various reductive pollutants, realizes solid-liquid separation, and the water quality that makes reuse water is to requiring.
Domestic grey water at first enters treatment system from each buildings or sub-district collection and after passing through the big floating matter of grid interception.At the coagulating district of pretreater inlet, water inlet pipe and reflux sludge tube are set, the returned sluge of domestic grey water and settling region enters the coagulating district jointly, adds inorganic polymer coagulant, impels flco to form and grows up by quick stirring.Reaction zone water outlet gravity flow enters the high speed settling section and carries out solid-liquid separation.The high speed settling section is placed many group swash plates, and surfaceloadingrate can reach 20~60m/h, and buck suspended substance in the process of upper reaches precipitates in the inclined tube district and enters sludge bucket and stores.A part of mud in bucket district is by sludge pump, reflux sludge tube and get back to the coagulating district, participates in coagulation process, improves coagulating sedimentation efficient; Excess sludge is collected aftertreatment, disposal by outer comb.
After domestic grey water was handled through pretreater, LAS and suspended substance etc. all significantly reduced, and enter the MBR reactor by pipeline self again.The MBR reactor is made up of bio-oxidation district and membrane separation zone, does not separate each other.Cultivate active sludge in the reactor, mixed solution sludge concentration (MLSS) control 6~12g/L.Aeration tube and aerator are all arranged in the bottom of MBR reactor, and wherein the bio-oxidation district arranges micro-hole aerator, and membrane separation zone is then arranged ultra-filtration membrane tripping device and perforation washpipe.The ultra-filtration membrane tripping device can be realized the switching of automatic suction filtration and back flushing state.Fluid level controller is installed in the membrane bioreactor, two position is set, be used to control the operation and the halted state of ultra-filtration membrane tripping device; When the liquid level of MBR reached the height of setting, the liquid level indicator signal was delivered to the ultra-filtration membrane tripping device, and the indication latter starts working; Along with ultra-filtration membrane tripping device after work for some time, the liquid level in the reactor is reduced to setting height, and the ultra-filtration membrane tripping device quits work, and can realize coming the automatic adjusting of water yield fluctuation.The water outlet of MBR is limpid colourless, and Pollutant levels are low, just can be back to use a plurality of fields through the sterilization back again.
The present invention compared with the prior art, effect is actively and significantly, its characteristic and advantage are as follows:
(1), will hang down the high-efficiency pretreatment and the membrane bioreactor that pollute buck and be coupling in same treatment system, intractability is low, investment cost is few;
(2), buck has good water quality stability after handling through the present invention, can be used as that fresh water is used to flush the toilet, subdistrict greening, carwash or industrial production etc.;
(3), the entire treatment automated system operation, have outstanding water quality and water yield adaptability and shock resistance;
(4), small accommodation area, only be about half of conventional depth treatment system, can realize automatic operation, management is simple.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is a processing unit synoptic diagram of the present invention.
Embodiment
Further describe technical scheme of the present invention below by specific embodiment.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.
Embodiment 1, domestic grey water MBR purification system
Domestic grey water MBR purification system in the present embodiment is made up of pretreater 1 and membrane bioreactor (MBR reactor) 2, and connect by pipeline 125 between pretreater 1 and the membrane bioreactor 2, specifically form referring to shown in Figure 1, the domestic grey water MBR purification system in the present embodiment can be used for the advanced treatment and the reuse of buck.
Wherein, pretreater 1 comprises coagulating district 11 and efficient settling section 12.
Dividing plate 117 by incomplete interval in the coagulating district 11 is divided into dosing mixing section 111 and reaction slaking section 112.One side (feed-water end) in coagulating district 11 has been provided with water inlet pipe 113, coagulant filling pipe 114 and reflux sludge tube 131; Dosing mixing section 111 is provided with and mixes stirring rake 115 (stirring velocity is 200-300r/min), and reaction slaking section 112 is provided with slow speed of revolution stirring rake 116 (stirring velocity is 10-50r/min).
Efficient settling section 12 inside are provided with the swash plate 121 and the bed mud slag scraper 122 of the parallel placement of many groups, simultaneously, the bottom notch of efficient settling section 12 becomes bucket district 123, the bottom in bucket district 123 is connected with a side of sludge reflux pump 13 through shore pipe 124, the opposite side of sludge reflux pump 13 is connected with outer comb 132 with reflux sludge tube 131, wherein the opposite side of reflux sludge tube 131 is connected with coagulating district 11, also is provided with valve 133 between reflux sludge tube 131 and sludge reflux pump 13.
Bucket district 123 is connected with coagulating district 11 by reflux sludge tube 131; A part of mud in bucket district 123 enters coagulating district 11 by reflux sludge tube 131 under the effect of return sludge pump 13, participate in coagulation process, improves coagulating sedimentation efficient; Other excess sludge is collected and aftertreatment by outer comb 132.The opposite side (water side) of efficient settling section 12 is connected with membrane bioreactor 2 by pipeline 125.
Membrane bioreactor 2 is made up of bio-oxidation district 21 and membrane separation zone 22, and is communicated with between bio-oxidation district 21 and the membrane separation zone 22, does not separate each other.
21 bottoms, bio-oxidation district are provided with micropore aeration pipe 211, and micropore aeration pipe 211 is connected with gas blower 213 by aeration arm 212.
Be provided with ultra-filtration membrane tripping device 221 and perforation washpipe 222 in the membrane separation zone 22, perforation washpipe 222 is connected with flushing gas blower 224 by air main 223.Ultra-filtration membrane tripping device 221 is made up of hyperfiltration membrane assembly, and the ultra-filtration membrane material is that pore diameter range is tunica fibrosa or the flat sheet membrane of 10nm~100nm.Ultra-filtration membrane tripping device 221 is connected with vacuum pump 226 by Automatic Control Unit 225, and Automatic Control Unit 225 is connected with liquid level indicator 227.
The function of Automatic Control Unit 225 is the automatic switchovers that are used to realize membrane module suction filtration and back flushing state.
The effect of fluid level controller 227 is running status or the halted states by two position control hyperfiltration membrane assembly.When liquid levels reached the height of setting after the clear water gravity flow of efficient settling section 12 enters membrane bioreactor 2, fluid level controller 227 was delivered to indicator signal ultra-filtration membrane tripping device 221 and indicates it to start working; Along with ultra-filtration membrane tripping device 221 after work for some time, liquid level in the membrane bioreactor 2 is reduced to setting height, indication ultra-filtration membrane tripping device 221 quits work, water level in the membrane bioreactor 2 can progressively rise, and ultra-filtration membrane tripping device 221 changes running status again over to when attaining to a high place.
The MBR scavenging process of embodiment 2, domestic grey water
Domestic grey water in the present embodiment is used mixedly buck, the NH of water inlet from all bathings, laundry and the kitchen etc. of certain buildings 3-N is 20~35mg/L, COD CrBe 200~350mg/l, LAS is 6.2~31.5mg/L, and TP is 3~8mg/L, and SS is 140~300mg/L.
Scavenging process is as follows:
Domestic grey water is collected the back enters pretreater 1 by water inlet pipe 113 dosing mixing section 111, this section is provided with coagulant filling pipe 114 and mixes stirring rake 115, here successively (coagulating agent in the present embodiment is a polymeric aluminum to buck with coagulating agent, and adding concentration is 30mg/L), returned sluge (sludge back flow quantity be flooding quantity 3%~5%) mixes, mix stirring rake 115 and stir thorough mixing and the reaction that promotes medicament, mud and water fast, and form flco.
Enter reaction slaking section 112 through the muddy water mixed solution that fully coagulates the wadding processing.Slow speed of revolution stirring rake 116 promotes flco to grow up by the slow stirring to current, avoids big flco broken.
Domestic grey water gravity flow behind the coagulating enters efficient settling section 12 and realizes solid-liquid separation.Many group swash plates 121 are installed on the upper strata of efficient settling section 12, and mud slag scraper 122 is installed in the bottom, and bottom notch forms sludge bucket 123.Muddy water mixed solution enters the swash plate district at efficient settling section, and surfaceloadingrate can reach 20~60m/h, and buck is here realized separating with flco.Settling of floccus is to the bottom, pond, scrape to sludge bucket 123 and storage by bed mud slag scraper 122 again, participate in the precipitation process of coagulation of buck then by sludge reflux pump 13, reflux sludge tube 131, excess sludge regularly discharges by outer comb 132 every day, excessively accumulates with the mud that prevents bucket district 123.Buck after the clarification enters membrane bioreactor 2 by rising pipe 125 gravity flows.
As follows through parameters detected result in the pretreated water outlet: NH 3-N is 17~30mg/L, COD CrBe 140~270mg/l, LAS is 2.2~11.5mg/L, and TP is 0.5~2.8mg/L, and SS is 30~80mg/L.
Pretreated water outlet enters in the bio-oxidation district 21 of MBR through coagulation clarification, mixes mutually with active sludge, forms mixed solution, and the pollutent microbial metabolism is decomposed; To mixed solution aeration in the bio-oxidation district 21, the dissolved oxygen (DO value) of control mixed solution is 2~5mg/L; Filter water outlet through the mixed solution after the biological treatment through membrane separation zone.Buck is 3~5h in the total residence time of membrane bioreactor 2, and wherein, the treatment time of buck in the bio-oxidation district is 2~3h, is 1~2h at the hydraulic detention time of membrane separation zone.
Membrane bioreactor 2 is cultivated biological sludge, and the total biomass of biological sludge and grey water mixture (MLSS) is controlled to be 6~12g/L.The bio-oxidation district 21 of membrane bioreactor 2 and the bottom of solid-liquid displacement zone 22 have been installed independently air diffuser respectively, wherein 21 bottoms, bio-oxidation district are provided with micro-hole aerator 211, be used for providing metabolism required oxygen to microorganism, micro-hole aerator 211 links to each other its aeration rate size of may command by aeration arm 212 with gas blower 213.
In carrying out the film biological treatment process of buck, the area of membrane separation zone 22 accounts for 1/2~1/3 of whole membrane bioreactor 2 areas, and ultra-filtration membrane tripping device 221 is made up of hyperfiltration membrane assembly, and the pore diameter range of film is between 10nm~100nm.Perforation washpipe 222 is arranged in the bottom of membrane separation zone, joins by air main 223 and flushing gas blower 224.The flushing air that gas blower produced carries out air by the perforation washpipe to membrane module and washes away, to avoid the film surface to form blocked up mud film, to keep stable membrane flux.Clear water after the ultra-filtration membrane tripping device will be handled by vacuum pump 226 is extracted out.When the operating pressure of vacuum pump 226 or suction filtration time reach set(ting)value, enter the back flushing state automatically.Automatic Control Unit 225 can realize the automatic switchover of membrane module suction filtration and back flushing state.Fluid level controller 227 is installed, by the running status or the halted state of two position controlling diaphragm assembly in the membrane bioreactor.When liquid level reached the height of setting after the gravity flow of settling pond supernatant liquor enters MBR, fluid level controller 227 was delivered to indicator signal the ultra-filtration membrane tripping device and indicates it to start working; Along with ultra-filtration membrane tripping device after work for some time, the liquid level in the reactor is reduced to setting height, and indication ultra-filtration membrane tripping device quits work, and the water level of reactor progressively rises, and changes running status when attaining to a high place again over to.Because the fluctuation of the water yield of buck is bigger, can realize in this way coming the flexible of the water yield.
After domestic grey water was handled through pretreater 1, LAS and suspended substance etc. all reduced, and the COD isoconcentration reduces, and not only can avoid excess foam generation in the subsequent biological treatment process, reduced the influence to mould material, and had shortened the time of biological treatment.Membrane bioreactor 2 combines the efficient solid-liquid separation of bio-oxidation and film together, uses a lot in small-sized water treatment field.
The water outlet of MBR is limpid colourless, and Pollutant levels are low, through just being back to use a plurality of fields behind combined chlorine or the uv sterilisation.
The result is as follows for the MBR purifying treatment:
Water outlet after the processing can reach NH 3-N is less than 2mg/L, COD CrLess than 30mg/L, TN is less than 20mg/L, and turbidity is lower than 0.1NTU, and total bacterial count is less than 10 2Individual/mL, E.coli does not detect.Reuse water can satisfy the water closet flushing that is directly used in buildings, the needs of greening water.
The outer draining of the domestic grey water of biotope, low concentration sewage, trade effluent also can reach " urban sewage reutilization city miscellaneous water water quality " (GB18920-2002) standard after purifying through the present invention.
In the present embodiment, low high-efficiency pretreatment and the membrane bioreactor that pollutes buck is coupling in same treatment system, intractability is low, investment cost is few, and small accommodation area, only is about half of conventional depth treatment system, can realize automatic operation, management is simple.Domestic grey water among the embodiment has good water quality stability after treatment, can be used as the fresh water miscellaneous water, be used to flush the toilet, subdistrict greening, carwash or industrial production etc., in treating processes, the entire treatment automated system operation has outstanding water quality and water yield adaptability and shock resistance.

Claims (4)

1. a domestic grey water MBR purifying method comprises two steps of coagulation clarification pre-treatment and membrane biological reaction processing; Described coagulation clarification pre-treatment is carried out in pretreater, and described pretreater comprises coagulating district and efficient settling section, and described coagulating district and efficient settling section connection;
Described coagulating district is divided into dosing mixing section and reaction slaking section by the dividing plate of incomplete sealing; And the feed-water end in described coagulating district is provided with water inlet pipe, coagulant filling pipe and reflux sludge tube; Described dosing mixing section is provided with the mixing stirring rake, and described reaction slaking section is provided with slow speed of revolution stirring rake; Wherein, the stirring velocity scope of described mixing stirring rake is 200-300r/min, and the stirring velocity of described slow speed of revolution stirring rake is 10~50r/min;
Described efficient settling section inside is provided with many group swash plates and bed mud slag scraper, and the bottom of described efficient settling section is provided with the bucket district that is used to accept mud, and the bottom in described bucket district is connected with a side of sludge reflux pump through shore pipe, the opposite side of sludge reflux pump and reflux sludge tube and efflux pipe coupling, the opposite side of described reflux sludge tube is connected with the coagulating district; Wherein, the surfaceloadingrate of described efficient settling section is 20~60m/h;
The concrete steps that described membrane biological reaction is handled are: pretreated water outlet enters the bio-oxidation district of MBR through coagulation clarification, mixes mutually with active sludge, forms mud mixture, and the microbial metabolism of pollutent on active sludge decomposed; Mixed solution after the biological treatment filters water outlet through membrane separation zone;
Bottom, described bio-oxidation district is provided with micro-hole aerator, and described membrane separation zone inside is provided with ultra-filtration membrane tripping device and perforation washpipe; And described ultra-filtration membrane tripping device is connected with vacuum pump by Automatic Control Unit, and described perforation washpipe is connected with the flushing gas blower by the air main;
Described ultra-filtration membrane tripping device is made up of hyperfiltration membrane assembly, and the material of described hyperfiltration membrane assembly is that pore diameter range is the tunica fibrosa of 10nm~100nm;
The area of described membrane separation zone is 1/2~1/3 of the membrane bioreactor total area.
2. domestic grey water MBR purifying method as claimed in claim 1 is characterized in that, described coagulation clarification pre-treatment comprises following concrete steps:
A) domestic grey water is collected the back enters pretreater by water inlet pipe dosing mixing section, buck successively mixes the formation muddy water mixed solution at the dosing mixing section with coagulating agent and returned sluge, and by stirring thorough mixing and the reaction that promotes medicament, returned sluge and water fast, to forming flco;
B) muddy water mixed solution through the thorough mixing reaction steps A) enters reaction slaking section, and by the slow speed of revolution stirring rake sluggish flow is stirred, and promotes flco to grow up;
C) muddy water mixed solution behind coagulating gravity flow enters efficient settling section and carries out solid-liquid separation and handle;
Described steps A) coagulating agent in is selected from polymeric aluminum, polymerization iron or double salt high-molecular coagulant adopting, and the concentration that adds of described coagulating agent is 10~30mg/L, sludge back flow quantity is 3%~5% of a flooding quantity, described step C) in, the surfaceloadingrate of efficient settling section is 20~60m/h;
In the concrete steps that described membrane biological reaction is handled, the suspended solids substrate concentration of described mud mixture is 6~12g/L, and the dissolved oxygen concentration in described MBR bio-oxidation district is 2~5mg/L.
3. a domestic grey water MBR purification system is characterized in that, described domestic grey water MBR purification system comprises pretreater and membrane bioreactor, and passes through pipe connection between described pretreater and the membrane bioreactor; Wherein, the dividing plate of the incomplete sealing that is provided with by its inside of described pretreater is divided into coagulating district and efficient settling section; Described membrane bioreactor comprises bio-oxidation district and membrane separation zone, and is communicated with the nothing separation fully between described bio-oxidation district and the membrane separation zone;
Described coagulating district is divided into dosing mixing section and reaction slaking section by the dividing plate of incomplete sealing; And the feed-water end in described coagulating district is provided with water inlet pipe, coagulant filling pipe and reflux sludge tube; Described dosing mixing section is provided with the mixing stirring rake, and described reaction slaking section is provided with slow speed of revolution stirring rake;
Described efficient settling section inside is provided with many group swash plates and bed mud slag scraper, and the bottom of described efficient settling section is provided with the bucket district that is used to accept mud, and the bottom in described bucket district is connected with a side of sludge reflux pump through shore pipe, the opposite side of sludge reflux pump and reflux sludge tube and efflux pipe coupling, the opposite side of described reflux sludge tube is connected with the coagulating district;
Bottom, described bio-oxidation district is provided with micro-hole aerator, and described membrane separation zone inside is provided with ultra-filtration membrane tripping device and perforation washpipe; And described ultra-filtration membrane tripping device is connected with vacuum pump by Automatic Control Unit, and described perforation washpipe is connected with the flushing gas blower by the air main;
Described ultra-filtration membrane tripping device is made up of hyperfiltration membrane assembly, and the material of described hyperfiltration membrane assembly is that pore diameter range is the tunica fibrosa of 10nm~100nm;
The area of described membrane separation zone is 1/2~1/3 of the membrane bioreactor total area.
4. domestic grey water MBR purification system as claimed in claim 3 is characterized in that, also is provided with liquid level indicator in the described membrane bioreactor.
CN2009102503413A 2009-12-04 2009-12-04 MBR purification method and system of domestic grey water CN101704620B (en)

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CN102858694A (en) * 2010-05-05 2013-01-02 通用电气公司 Mixed liquor filterability treatment in a membrane bioreactor
JP5782931B2 (en) * 2011-09-05 2015-09-24 富士電機株式会社 Water treatment method and water treatment apparatus
CN102503043A (en) * 2011-11-17 2012-06-20 熊昕 Multifunctional and efficient mobile sewage processor and sewage processing technology thereof
CN102730825A (en) * 2012-06-20 2012-10-17 太平洋水处理工程有限公司 Modified CAST equipment and technology employing submerged hollow fiber ultrafiltration membranes
CN103193361A (en) * 2013-03-18 2013-07-10 哈尔滨工程大学 Advanced treatment, regeneration and reuse device and method of domestic sewage from ships
CN103212301B (en) * 2013-04-28 2015-01-21 哈尔滨工业大学 Ultrafiltration membrane pool with secondary on-line coagulation function
CN104211269A (en) * 2014-09-30 2014-12-17 洛阳绿仁环保设备有限公司 Kitchen wastewater treatment device

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