CN102838205B - External continuous flow aerobic granular sludge membrane bioreactor - Google Patents

External continuous flow aerobic granular sludge membrane bioreactor Download PDF

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Publication number
CN102838205B
CN102838205B CN2012103197027A CN201210319702A CN102838205B CN 102838205 B CN102838205 B CN 102838205B CN 2012103197027 A CN2012103197027 A CN 2012103197027A CN 201210319702 A CN201210319702 A CN 201210319702A CN 102838205 B CN102838205 B CN 102838205B
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membrane
reaction tank
continuous flow
membrane module
solid
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CN102838205A (en
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陈静
彭培源
王悦超
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Shanghai LG Electronics Co Ltd
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Shanghai LG Electronics Co Ltd
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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 relates to an external continuous flow aerobic granular sludge membrane bioreactor. The bioreactor comprises a continuous flow biological reaction tank, a membrane module and aeration equipment, wherein the continuous flow biological reaction tank is connected with a water inlet tank; aerobic granular sludge can be formed and reserved inside the continuous flow biological reaction tank; the membrane module is arranged outside the continuous flow biological reaction tank; a water inlet of the membrane module is connected with a water outlet at the upper part of the continuous flow biological reaction tank; the aeration equipment is used for providing necessary oxygen for the biodegradation reaction; and sewage to be treated enters the continuous flow biological reaction tank in a continuous flow mode, pollutants in the sewage are contacted with the aerobic granular sludge in the reaction tank, the aerobic granular sludge treatment is carried out under the condition of supplying oxygen by the aeration equipment, then the sewage enters the membrane module, a solid-liquid mixture is separated by the membrane module and filtrate is continuously drained. The external continuous flow aerobic granular sludge membrane bioreactor not only can be kept having the original advantage of excellent effluent quality of the membrane bioreactor, but also can play the advantage characteristic that the granular sludge synchronously removes organisms, denitrifies and removes phosphorous.

Description

The external placed type continuous-flow aerobic granular sludge membrane bioreactor
Technical field
The present invention relates to a kind of sewage disposal technology, refer in particular to a kind of external placed type continuous-flow aerobic granular sludge membrane bioreactor.
Background technology
Along with the quickening of urbanization process, the increase of urban population, the quantity discharged of trade effluent and sanitary sewage is increasing.In recent years, due to the aggravation of water environment pollution and body eutrophication problem, the application of water pollution control technology is more and more extensive.Biological degradation method is to remove the most economical effective means of organism in waste water.According in bio-metabolic process to the demand status of oxygen, microorganism can be divided into aerobic microbiological, anoxic microorganism, anaerobion and intervenient aerobic-anaerobic microbe, aerobic microbiological dominate always in sewage disposal wherein, multiplex sewage in processing below intermediate concentration.
There are many deficiencies in traditional activated sludge sewage processing system, excess sludges as a large amount of in easy generation, and impact load is responsive, reactor volume is huge and volumetric loading is lower; Very easily cause the thread fungus raised growth, cause sludge bulking, processing efficiency descends, and even causes the treatment process paralysis.In recent years; occurred many with biological autoflocculation application of principle in the aerobic reaction system, to realize the granular research of aerobic sludge: owing to having retained the good aerobic grain shape active sludge of a large amount of settling properties in reactor; can reduce the requirement to the sludge settling system; reduce the discharging of excess sludge, significantly reduce simultaneously the overall operation energy consumption.This Aerobic Granular Sludge Technology has utilized the autoflocculation of microorganism to form the closely knit thalline of structure, has mud-water separation better performances, tolerance organic loading advantages of higher., owing to integrating different properties microorganism (aerobic, anoxic and anaerobion), can reach higher sludge concentration in reactor, thereby improve volumetric loading and the capacity of resisting impact load of reactor; Because it has good settling property, can reduce reactor volume and floor space, have very important significance at the economic aspect tool.Simultaneously, aerobic particle mud also can be used for the processing of hard-degraded substance in trade effluent (heavy metal and complicated organism), especially aspect processing high concentrated organic wastewater and denitrogenation dephosphorizing.
Membrane bioreactor (MBR) is the emerging sewage disposal technology that membrane separation technique is combined with biochemical processing, its degraded that can realize simultaneously microbe matter in the space of compactness and film separate pollution substance, have efficient, practical, technique is compact, save the advantages such as occupation of land.As shown in Figure 1, membrane bioreactor mainly comprises following part:
1) anaerobic/anoxic, Aerobic Pond
2) membrane cisterna and membrane module
3) water inlet, water outlet and sludge reflux system
particularly, water inlet 1 ' enters Buffer Pool 3 ' by meticulous grid 2 ', then send into anaerobic pond/anoxic pond 5 ', through agitator 4 ' wherein, sewage after by anaerobic pond/anoxic pond 5 ', the nitrogen phosphorus in sewage being realized efficiently removing enters Aerobic Pond 6 ', be provided with sensor 8 ' and aeration divider 9 ' in Aerobic Pond 6 ', sewage after Aerobic Pond 6 ' is processed enters membrane cisterna 7 ', after processing, membrane module 10 ' wherein utilize suction pump 12 ' to extract filtrate out, wherein the Drainage pipe of membrane module 10 ' is provided with pressure transmitter 11 ', aerator 14 ' is delivered to membrane module 10 ' below by gas meter 13 ' with gas, membrane cisterna 7 ' bottom is deposited pond by recycle pump 15 with anaerobic pond/anoxic pond 5 ' and mud and is communicated.
Membrane bioreactor (MBR) with said structure has following defect:
1) membrane pollution problem and with respect to the high energy consumption of traditional waste water treatment process, remain the Main Bottleneck that limits this technology widespread use and popularization.Membrane contaminant matter and pollution course directly and in reactor sludge character and the microorganism growth feature closely related.Along with to the going deep into of MBR understanding and research, how to adjust and improve microbial morphology and sludge character in MBR, thereby reach the purpose of decelerating membrane pollution, become one of Important Problems of membrane bioreactor research.
2) in addition, as realizing efficiently removing to the nitrogen phosphorus in sewage, on the basis of Aerobic Pond and membrane cisterna, also need to increase the recirculation system between anaerobic reation pool, hypoxia response pond and each reaction tank, fixedly input cost and the floor space of the remarkable increase system of this meeting.
Application number is that 200710058108.7 patent discloses a kind of integrative aerobic particle sludge membrane bioreactor, application number is that 200720023157.1 patent discloses the integrated aerobic granular sludge membrane bioreactor, and this class membrane bioreactor mainly comprises:
1) aerobic particle mud reaction tank
2) membrane module
3) water inlet, outlet system
This type of integrative aerobic particle sludge membrane bioreactor has following defect:
1) be difficult to effective formation and the reservation aerobic particle mud in reactor, need external source to cultivate rear regularly interpolation;
2) because membrane module is immersed in aerobic granular sludge reactor, the aeration film scouring of membrane module can cause a large amount of fragmentations of aerobic particle mud in operational process, so performance stability can't guarantee, needs frequent starting or a large amount of granule sludges of external source inoculation.
3) formation of aerobic particle mud and removal pollutent need effective solid-liquid flow, if and membrane module is immersed in aerobic granular sludge reactor, when granule sludge concentration is higher, membrane module can stop the motion of granule sludge, make granule sludge fully with pollutent, to contact, reduce contaminant removal efficiency; Even, granule sludge can harden between flat sheet membrane or the two ends of hollow fiber film assembly, significantly reduces the effective film filtration area, increases cleaning frequency membrane, shortens film work-ing life.
4) at present integrative aerobic particle sludge membrane bioreactor adopts sequence batch (Inlet and outlet water mode more, the complicacy of like this can the increase system controlling, and significant limitation the Application Areas of this reactor.
Summary of the invention
The technical problem to be solved in the present invention is: propose a kind of external placed type continuous-flow aerobic granular sludge membrane bioreactor, to improve or to overcome the one or more defect that prior art exists.
Technical solution of the present invention is: a kind of external placed type continuous-flow aerobic granular sludge membrane bioreactor, this reactor comprises continuous flow biological reaction tank, membrane module and aerator, wherein, this continuous flow biological reaction tank is connected with pump sump, can form and keep aerobic particle mud in it, described membrane module is arranged on the outside of described continuous flow biological reaction tank, the water-in of this membrane module is connected with the water outlet on described continuous flow biological reaction tank top, and described aerator provides essential oxygen for bio-degradation reactions; Treatment sewage adopts the Continuous Flow mode to enter this continuous flow biological reaction tank, pollution substance in sewage contacts with the aerobic particle mud in reaction tank, under the condition by the aerator oxygen gas-supplying, carrying out aerobic particle mud processes, sewage enters membrane module afterwards, by membrane module, solidliquid mixture is separated, and discharge filtered solution continuously.
Due to membrane contaminant matter and pollution course directly and in reactor sludge character and the microorganism growth feature closely related, therefore, along with going deep into MBR understanding and research, how to adjust and improve microbial morphology and sludge character in MBR, thereby reach the purpose of decelerating membrane pollution, become one of Important Problems of membrane bioreactor research.In membrane bioreactor, mud should have higher activity, suitable high sludge concentration, can ensure the high quality water outlet, has again certain space scale (not in small, broken bits) and intensity, keeps good stalling characteristic and the pollution that reduces film.Therefore, the granular sledge with certain size of microorganism self formation more can meet the feature request of membrane bioreactor than general floc sludge.Therefore, the present invention organically combines Aerobic Granular Sludge Technology and membrane separation technique, both can keep the good advantage of the original effluent quality of membrane bioreactor, can bring into play again granule sludge and synchronously remove the advantageous characteristic of organism and denitrogenation dephosphorizing.Simultaneously, the particle diameter that granule sludge is larger and fine and close structure also can improve the strainability of mixed solution greatly, increase membrane flux, decelerating membrane pollution process, the work-ing life of prolongation film.
Show through test, external placed type continuous-flow aerobic granular sludge-membrane bioreactor of the present invention has following advantage in application:
1) fixedly input cost and energy consumption level will significantly reduce more than 30% compared to other membrane bioreactors;
2) film will extend to 7-10 by 3-5 work-ing life;
3) floor space is expected to reduce with respect to traditional activated sludge process and reaches more than 75%.
4) system is controlled simply, and is stable continuously, can be widely used in municipal administration, industry, high density, difficult degradation, the sewage disposal that contains poisonous pollutent and reuse field.
Description of drawings
Fig. 1 is the structural representation of existing membrane bioreactor.
Fig. 2 is the structural representation of a specific embodiment of external placed type continuous-flow aerobic granular sludge membrane bioreactor of the present invention.
Fig. 3 is the structural representation of another specific embodiment of external placed type continuous-flow aerobic granular sludge membrane bioreactor of the present invention.
The main label declaration of accompanying drawing:
Prior art (Fig. 1):
1 ', water inlet 2 ', meticulous grid 3 ', Buffer Pool
4 ', anaerobic pond/anoxic pond 5 ', agitator 6 ', Aerobic Pond 6
7 ', membrane cisterna 8 ', sensor 9 ', aeration divider
10 ', membrane module 11 ', pressure transmitter 12 ', suction pump
13 ', gas meter 14 ', aerator (gas blower) 15 ', recycle pump
The present invention (Fig. 2, Fig. 3):
1, pump sump 2, intake pump 3, continuous flow biological reaction tank
4, solid-liquid separator 5, diversion trench/cylinder 6, high dissolved oxygen district
7, aerobic particle mud 8, low dissolved oxygen district 9, membrane module
10, suction pump 11,11a, 11b, aerator (gas blower) 12, recirculating pump
13, pressure pump
Embodiment
The present invention is a kind of external placed type continuous-flow aerobic granular sludge membrane bioreactor, this reactor comprises continuous flow biological reaction tank, membrane module and aerator, wherein, this continuous flow biological reaction tank is connected with pump sump, can form and keep aerobic particle mud in it, described membrane module is arranged on the outside of described continuous flow biological reaction tank, the water-in of this membrane module is connected with the water outlet on described continuous flow biological reaction tank top, and described aerator provides essential oxygen for bio-degradation reactions; Treatment sewage adopts the Continuous Flow mode to enter this continuous flow biological reaction tank, pollution substance in sewage contacts with the aerobic particle mud in reaction tank, under the condition by the aerator oxygen gas-supplying, carry out the biochemical reaction of synchronous removal organism, toxicant and the denitrogenation dephosphorizing of granule sludge, sewage after aerobic particle mud is processed enters membrane module, by membrane module, solidliquid mixture is separated, discharge continuously filtered solution.
Because membrane module of the present invention is independent of continuous flow biological reaction tank, formation and stable reservation to aerobic particle mud in reaction tank can not cause any negative impact, granule sludge can form voluntarily fast in reaction tank, and stable existence, need not after external source is cultivated to add; On the other hand, the poor mud of the settling property that produces in continuous flow biological reaction tank can flow into the external membrane assembly from the water outlet of solid-liquid displacement zone top continuously, regularly spoil disposal from membrane cisterna or pressure type membrane module.
In addition, what the present invention adopted is the Continuous Flow water inlet, and by the membrane module continuous effluent, system is controlled simple applied range, and the film stable effluent quality reaches or is better than country's discharging or reuse standard, therefore can directly discharge or enter the water reclaiming system.The mud that the settling property that produces in continuous flow biological reaction tank of the present invention is poor, can flow into the external membrane assembly from the water outlet of solid-liquid displacement zone top continuously, only need regularly spoil disposal from membrane cisterna or pressure type membrane module to get final product, therefore sustainablely from membrane module, pump high-quality water outlet, and the mud overwhelming majority who stays in continuous flow biological reaction tank is the extraordinary granule sludge of settling property.
Preferably, comprise the reaction zone of bottom and the solid-liquid displacement zone on top in described continuous flow biological reaction tank, described solid-liquid displacement zone is expanded and formed by the reaction zone upper volume, is provided with solid-liquid separator in it; At the solidliquid mixture that described reaction zone high speed flows, enter this disengaging zone after flow velocity reduce rapidly, thereby make the good particle of most of settling property return to reaction zone along the disengaging zone sidewall.
Further, described solid-liquid separator is located in the solid-liquid displacement zone on reaction zone top, can be formed by single or multiple structures with ramp and lower inclined plane, it is better has ramp and lower inclined plane and forms the V-arrangement cross section, most granule sludges are blocked in reaction zone by the lower inclined plane of solid-liquid separator, and the granule sludge that enters on a small quantity the solid-liquid displacement zone upper strata can return to reaction zone along the solid-liquid separator ramp; Sewage after processing enters external placed type membrane cisterna or membrane module via the water outlet outflow on solid-liquid separator top.
Below coordinate drawings and the specific embodiments to be described in further detail the specific embodiment of the present invention.
Fig. 2 is the structural representation of a specific embodiment of the present invention, as shown in the figure, the external placed type continuous-flow aerobic granular sludge membrane bioreactor of the present embodiment comprises continuous flow biological reaction tank 3, membrane module 9 and aerator 11a, 11b, can form and keep aerobic particle mud in continuous flow biological reaction tank 3, the entrance of its bottom is connected with pump sump 1 by intake pump 2, and aerator (as gas blower) 11a is connected to reaction tank by pipeline, for bio-degradation reactions provides essential oxygen.
In the present embodiment, the form that this continuous flow biological reaction tank 3 is big up and small down, particularly, comprise the reaction zone of bottom and the solid-liquid displacement zone on top in this reaction tank, wherein, solid-liquid displacement zone is expanded and formed by the reaction zone upper volume, is provided with solid-liquid separator 4 in it, and solid-liquid separator 4 is located in this solid-liquid displacement zone.Utilize aforementioned structure, make flow velocity after the solidliquid mixture that the reaction zone high speed flows enters this solid-liquid displacement zone reduce rapidly, thereby make the good particle of most of settling property return to reaction zone along the sidewall of solid-liquid displacement zone.
In the present invention, the aspect ratio of reaction zone (H/D) is preferably between 2: 1~10: 1; And preferably at distance reaction tank top 1/6~1/3 place's volume, expand the formation solid-liquid displacement zone, solid-liquid displacement zone and reaction zone diameter are better for 1: 1~3: 1; Utilize aforementioned result, make flow velocity after the solidliquid mixture that the reaction zone high speed flows enters this disengaging zone reduce rapidly, thereby make the good particle of most of settling property return to reaction zone along the disengaging zone sidewall.
Alternatively, be provided with flow-guiding structure (for example diversion trench and/or guide shell 5) in reaction zone, being divided into high dissolved oxygen district and low dissolved oxygen district in reaction zone, please in conjunction with shown in Figure 2, can utilize guide shell 5 to form high dissolved oxygen district 6 and low dissolved oxygen district 8 in the present invention, thus the efficiency of strengthening system denitrogenation dephosphorizing.
Further, solid-liquid separator 4 is better to have ramp and lower inclined plane and forms the V-arrangement cross section, and the stub end in V-arrangement cross section is fixed in the inwall of the solid-liquid displacement zone of reaction tank, and tip orientating reaction pond central shaft arranges; In sludge handling process, most granule sludges will be blocked in reaction zone by the lower inclined plane of solid-liquid separator, and the granule sludge that enters on a small quantity the solid-liquid displacement zone upper strata can return to reaction zone along the solid-liquid separator ramp; Sewage after processing enters external placed type membrane cisterna or membrane module via the water outlet outflow on solid-liquid separator 4 tops.In addition, solid-liquid separator 4 can be selected to establish and be single or multiple lift, any position, bottom to top that its position can be below the solid-liquid displacement zone liquid level.
Membrane module 9 is arranged on the outside of continuous flow biological reaction tank 3, and the sewage after the aerobic particle mud in continuous flow biological reaction tank 3 is processed enters membrane module 9, by 9 pairs of solidliquid mixtures of membrane module, is separated.Adopt immersion type membrane component in the present embodiment, its membrane cisterna is arranged on the outside of reaction tank lower reaction zone, in order to reducing, takes up an area space; The water outlet on described continuous flow biological reaction tank top is connected with the water-in at these membrane module 9 tops, and the filtered solution of membrane module 9 is discharged by a suction pump 10; Aerator (as gas blower) 11b is connected to the gas distributor of membrane module 9 belows by pipeline, thereby provides effective scrubbing action for membrane module 9.
Fig. 3 is the structural representation of another specific embodiment of the present invention, the main difference of the present embodiment and last embodiment is pointed out to be, the membrane module 9 of the present embodiment adopts the pressure type membrane module, and this pressure type membrane module is connected with the top water outlet of continuous flow biological reaction tank 3 by a pressure pump 13.The water outlet of reaction tank 3, by in pressure pump 13 pump-in pressure formula membrane modules 9, can be adopted cross flow filter or the water outlet of dead-end filtration method, and the trapped particles thing returns to reaction tank 3.Compared to immersion type membrane component, the pressure type membrane module has that floor space is little, the water flux high, should be lower than the influent turbidity of immersion type membrane component but enter the influent turbidity of pressure type membrane module.Therefore, immersion type membrane component is more suitable for the sewage (as multiple industrial sewage) of processing high pollution, high solid content, and the pressure type membrane module is more suitable for the sewage (as municipal wastewater) of the low solid content of processing etc.
Below in conjunction with said structure, the concrete treating processes of previous embodiment is described in detail:
At first, treatment sewage adopts the Continuous Flow mode to enter this continuous flow biological reaction tank 3, pollution substance in sewage such as organism, nitrogen, phosphorus, toxicant (as heavy metal, microbiotic etc.) etc., contact with the aerobic particle mud 7 in reaction tank, under the condition by the aerator oxygen gas-supplying, carry out the biochemical reaction of synchronous removal organism, toxicant and the denitrogenation dephosphorizing of granule sludge.Aerobic Granular Sludge Technology has utilized the autoflocculation of microorganism to form closely knit circle or the oval thalline of structure, has mud-water separation better performances, tolerance organic loading advantages of higher., owing to integrating different properties microorganism (aerobic, anoxic and anaerobion), can reach higher sludge concentration in reactor, thereby improve volumetric loading and the capacity of resisting impact load of reactor; Because it has good settling property, can reduce reactor volume and floor space, have very important significance at the economic aspect tool.
Sewage, further contacts with the external membrane assembly at its pollutent after the aerobic particle mud degraded.Membrane module position and continuous-flow aerobic granular sludge biological reaction tank are separated, separatory membrane can be microfiltration membrane or ultra-filtration membrane, its film type can be hollow-fibre membrane or flat sheet membrane, its mould material is organic membrane or mineral membrane, and kit form can be immersion type membrane component (as Fig. 2) or pressure type membrane module (as Fig. 3).Separatory membrane is retained in most suspended particulate matters in reactor, and filtered solution is pumped from system by suction pump.
On the other hand, be trapped in membrane module 9 outer granule sludge or other particulate matter and will return to continuous flow biological reaction tank 3, or as excess sludge, discharge.
External placed type continuous-flow aerobic granular sludge membrane bioreactor in the present invention has the following advantages compared to existing aerobic granular sludge membrane bioreactor:
A) membrane module itself and film aerating system are independent of the continuous-flow aerobic granular sludge reaction tank, aerobic particle mud in reaction tank is formed and stablizes reservation and can not cause any negative impact, granule sludge can form voluntarily fast in reaction tank, and stable existence, need not after external source is cultivated to add;
B) membrane module separates with the most aerobic particle muds in reactor, even if granule sludge dense (20-40g/L) also can not affect the motion of granule sludge, therefore granule sludge can fully contact with pollutent, the load efficiency of remarkable increase system, the shock resistance of improvement system;
C) because most granule sludges are retained in the continuous-flow aerobic granular sludge reaction tank, only have a small amount of mud and suspended particulate can flow into the film system of external placed type, therefore remarkable decelerating membrane pollution speed, raising membrane flux, reduce cleaning frequency membrane, prolonging service lifetime of film.
What d) the present invention adopted is the Continuous Flow water inlet, and the membrane module continuous effluent, and system is controlled simple applied range, and the film stable effluent quality reaches or is better than country's discharging or reuse standard, therefore can directly discharge or enter the water reclaiming system.
Aerobic particle mud cultivate and operational process in, can poor granular debris or the mud flco of generating portion settling property, the poor mud of this part settling property needs regular discharge system, thereby the absolute predominance of granule sludge and premium properties in the assurance system.
Built-in membrane module due to what adopt in existing aerobic granular sludge membrane bioreactor, if adopt the membrane module water outlet, whole mud can be dammed in system, thereby the poor mud of settling property can not reach by the membrane module water outlet purpose of discharge system, therefore built-in aerobic granular sludge membrane bioreactor must, regularly from the posticum water outlet of reactor side different heights, be discharged the poor mud of settling property.Although this just causes water inlet can be continuous, membrane module water outlet and reactor water outlet are all step, and the water of being discharged by the reactor posticum, owing to still containing more mud and can not reach emission standard in the inside, and need further to process.
The mud that the settling property that produces in continuous flow biological reaction tank of the present invention is poor, the water outlet from the solid-liquid displacement zone top that can be continuous flows into the external membrane assembly, only need regularly spoil disposal from membrane cisterna or pressure type membrane module to get final product, therefore sustainablely from membrane module, pump high-quality water outlet, and the mud overwhelming majority who stays in continuous flow biological reaction tank is the extraordinary granule sludge of settling property.The granular sledge with certain size that the present invention utilizes microorganism self to form can make mud in membrane bioreactor both have higher activity, suitable high sludge concentration; can ensure the high quality water outlet; have again certain space scale (not in small, broken bits) and intensity, keep good stalling characteristic and the pollution that reduces film.The present invention organically combines Aerobic Granular Sludge Technology and membrane separation technique, both can keep the good advantage of the original effluent quality of membrane bioreactor, can bring into play again granule sludge and synchronously remove the advantageous characteristic of organism and denitrogenation dephosphorizing.Simultaneously, the particle diameter that granule sludge is larger and fine and close structure also can improve the strainability of mixed solution greatly, increase membrane flux, decelerating membrane pollution process, the work-ing life of prolongation film.
Although the present invention discloses with specific embodiment; but it is not in order to limit the present invention; included continuous flow biological reaction tank type, membrane module type or position, support equipment kind or quantity in the present invention for example; be not limited only to Fig. 2, shown in Figure 3; any those skilled in the art; the displacement of the equivalent assemblies of having done under the prerequisite that does not break away from the spirit and scope of the present invention, or, according to equivalent variations and modification that scope of patent protection of the present invention is done, all should still belong to the category that this patent is contained.

Claims (6)

1. external placed type continuous-flow aerobic granular sludge membrane bioreactor, it is characterized in that, this reactor comprises continuous flow biological reaction tank, membrane module and aerator, wherein, the entrance of this continuous flow biological reaction tank bottom is connected with pump sump by intake pump, can form and keep aerobic particle mud in it, comprise the reaction zone of bottom and the solid-liquid displacement zone on top in described continuous flow biological reaction tank, the aspect ratio of described reaction zone (H/D) is 2:1~10:1, and be to expand and form described solid-liquid displacement zone at distance reaction tank top 1/6~1/3 place's volume, solid-liquid displacement zone is 1:1~3:1 with the reaction zone diameter ratio, be provided with flow-guiding structure in described reaction zone, described reaction zone is divided into high dissolved oxygen district and low dissolved oxygen district, described solid-liquid displacement zone is expanded and formed by the reaction zone upper volume, be provided with solid-liquid separator in it, described solid-liquid separator comprises single or multiple structures with ramp and lower inclined plane, at the solidliquid mixture that described reaction zone high speed flows, enter this disengaging zone after flow velocity reduce rapidly, thereby make the good particle of most of settling property return to reaction zone along the disengaging zone sidewall, described membrane module is arranged on the outside of described continuous flow biological reaction tank, and the water-in of this membrane module is connected with the water outlet on described continuous flow biological reaction tank top, and described aerator provides essential oxygen for bio-degradation reactions, treatment sewage adopts the Continuous Flow mode to enter this continuous flow biological reaction tank, pollution substance in sewage contacts with the aerobic particle mud in reaction tank, under the condition by the aerator oxygen gas-supplying, carrying out aerobic particle mud processes, sewage enters membrane module afterwards, by membrane module, solidliquid mixture is separated, and discharge filtered solution continuously.
2. external placed type continuous-flow aerobic granular sludge membrane bioreactor as claimed in claim 1, is characterized in that, described solid-liquid displacement zone is provided with the described solid-liquid separator of single or multiple lift, and solid-liquid separator is located at the following position of solid-liquid displacement zone liquid level.
3. external placed type continuous-flow aerobic granular sludge membrane bioreactor as claimed in claim 1, it is characterized in that, described membrane module adopts immersion type membrane component or pressure type membrane module, its separatory membrane adopts microfiltration membrane or ultra-filtration membrane, its film type is hollow-fibre membrane or flat sheet membrane, and its mould material is organic membrane or mineral membrane.
4. external placed type continuous-flow aerobic granular sludge membrane bioreactor as claimed in claim 1, is characterized in that, described membrane module is retained in most suspended particulate matters in reaction tank, and filtered solution is pumped from membrane module by suction pump.
5. external placed type continuous-flow aerobic granular sludge membrane bioreactor as described in claim 1 to 4 any one, it is characterized in that, described external membrane assembly is provided with the mud discharging mouth that is communicated to continuous flow biological reaction tank, be trapped in membrane module outer granule sludge or other particulate matter and will return to continuous flow biological reaction tank by this mud discharging mouth, or as excess sludge, discharge.
6. external placed type continuous-flow aerobic granular sludge membrane bioreactor as claimed in claim 1, it is characterized in that, the second section that described aerator comprises the first part that is communicated to the continuous flow biological reaction device and is communicated to described external membrane assembly below, first part provides essential oxygen for bio-degradation reactions, and described second section provides effective scrubbing action for membrane module.
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