CN1935689A - Apparatus and method for treating sewage by air-lift internal circulating membrane bioreactor - Google Patents

Apparatus and method for treating sewage by air-lift internal circulating membrane bioreactor Download PDF

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Publication number
CN1935689A
CN1935689A CNA2006101138512A CN200610113851A CN1935689A CN 1935689 A CN1935689 A CN 1935689A CN A2006101138512 A CNA2006101138512 A CN A2006101138512A CN 200610113851 A CN200610113851 A CN 200610113851A CN 1935689 A CN1935689 A CN 1935689A
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membrane
membrane bioreactor
water
air
inner core
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CNA2006101138512A
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Chinese (zh)
Inventor
叶亚平
张兆昌
祁会庆
严伟
温艳军
崔永茂
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BEIJING WEIWENTE ENVIRONMENTAL TECH-DEVELOPMENT Co Ltd
University of Science and Technology Beijing USTB
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BEIJING WEIWENTE ENVIRONMENTAL TECH-DEVELOPMENT Co Ltd
University of Science and Technology Beijing USTB
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Priority to CNA2006101138512A priority Critical patent/CN1935689A/en
Publication of CN1935689A publication Critical patent/CN1935689A/en
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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 a stripping internal circulation membrane bioreactor sewage treating device and method, belonging to environmental protection technical field, characterized in that column membrane component or row membrane component is arranged in an inner cylinder of the membrane bioreactor, where the column membrane component comprises membrane threads and membrane water outlet pipe. And the compressed air generated by air pump entering through aerator into the inner cylinder rises along the inner cylinder so as to be able to wash out the membrane threads to retard membrane pollution and provide the required oxygen gas for microbes in activated sludge mixed solution. And the circulating airflow rising along the inner cylinder and falling along the outer cylinder prolongs air-water contact path, and strengthens oxygen transfer. And it integrates advantages of the internal circulation bioreactor with filtering performance of membrane, and can obtain high membrane surface flow speed and reduce membrane pollution, raise oxygen transfer efficiency, and effectively reduce water treatment energy consumption by 12%-30% on the condition that the aeration quantity is the same as that of the current integrated membrane bioreactor.

Description

The treating sewage by air-lift internal circulating membrane bioreactor devices and methods therefor
Technical field
The invention belongs to environmental technology field, particularly a kind of integral type film biological reactor.
Background technology
Film-separation biological reactor employing ultra-filtration membrane or micro-filtration membrane module are held back the biosolids in the reactor, by keeping higher biomass concentration, make in the water organism realize degraded, because the high efficiency separation performance of film, with adopt gravitational settling to be separated into main traditional activated sludge process sewage treatment process to compare and have the effluent quality excellence, the operation operation is simple, advantages such as compact construction, volumetric loading height, excess sludge production lack, membrane bioreactor constantly enlarges and increases in the range of application and the scale of sewage disposal.Yet, film pollutes, the utilization ratio of higher power charge and oxygen is low is the bottleneck that hinders the membrane Bio-reactor Technology widespread use, film pollutes and causes membrane flux to descend, and increases the frequency that membrane module is changed and film cleans, and is to cause membrane bioreactor energy consumption major reason for higher.Integral type film biological reactor, membrane module is directly inserted in the reactor, aerator be arranged on film under, pollutent on the flushing membrane assembly and give that the microorganism oxygenation need blast the higher air-blowing energy consumption of air consumption in the pond, for obtaining better ydrodynamics characteristic, under equal aeration rate, to obtain bigger intermembranous liquid cross-flow flow velocity, " the ydrodynamics characteristic of integral type film biological reactor ", 2000, environmental science Vo.21 (9): 47); " Designand operation considerations for wastewater treatment using a flat submergedmembrane bioreactor ", Process Biochemistry 38 (2002) 279_285); " Treatment ofhospital wastewater using a submerged membrane bioreactor ", ProcessBiochemistry 39 (2004) 1427_1431); " Operational performance of a submergedmembrane bioreactor for reclamation of bath wastewater ", ProcessBiochemistry40 (2005) 125_130) integral type film biological reactor is improved, its common ground is bio-reactor to be divided into the up-flow district and to fall the stream district with dividing plate, membrane module places the up-flow district, divide into aerating apparatus so that water circulation power and the required oxygen of microbiological degradation organism to be provided, result from research, be in the flow velocity approximately big 6.2%~21% of every membrane module intermediary liquid upflow velocity than film both sides, slowed down the film pollution, reduced energy consumption, the square spacer plate that reactor adopts is convenient to adapt to the shape of membrane module and is easy to processing, but there are the dead angle in the square box structure and the square spacer plate of reactor, flow resistance is bigger, the not high shortcoming of coefficient of oxygen utilization.
Summary of the invention
The present invention is directed to improved integral type film biological reactor square box structure and square spacer plate and have problems such as dead angle, flow resistance are big, coefficient of oxygen utilization is not high, a kind of method and corresponding film bioreactor device for the treatment of sewage by air-lift internal circulating membrane bioreactor are proposed, can under the condition of the present equal aeration rate of integral type film biological reactor, obtain high crossflow velocity, high oxygen transfer efficient, effectively reduce the water treatment energy consumption, decelerating membrane pollution prolongs the film cleaning interval.
A kind for the treatment of sewage by air-lift internal circulating membrane bioreactor device, this device by grid and screen cloth 2, equalizing tank 3, recycle pump or vacuum primingpump 4, membrane bioreactor inner core 5, membrane bioreactor urceolus 6, aerating apparatus 7, valve 8, blast main 9, air flowmeter 10, pneumatic pump 11, valve 12, purify water pipe 13, the flow meter 14 of purifying waste water, valve 15, suction pump 16, cleaned water tank 17 and form, it is characterized in that having placed in the membrane bioreactor inner core 5 columnar membrane assembly 18 or horizontally-arranged membrane module 21, membrane module 18 comprises film silk 19, film rising pipe 20.Former water 1 enters equalizing tank 3 through grid or screen cloth 2, enter the bottom of membrane bioreactor urceolus 6 through recycle pump or vacuum primingpump 4, membrane bioreactor inner core 5 and membrane bioreactor urceolus 6 are made up of two concentric cylinders, aerating apparatus 7 is located at the bottom of inner core 5, is full of active sludge intermixture in the reactor.When the pressurized air that is produced by pneumatic pump 11 stimulates the menstrual flow aerating apparatus 7 when discharging into membrane bioreactor inner core 5 (up-flow tube) through air flowmeter 10, blast main 9 and valve 8, because the pushing effect and wrapped folder and the mixing effect of pressurized air in water of gas, active sludge intermixture severe is reduced and make progress and flow, overflow with air pocket after arriving the top, the mixed solution that contains small bubbles then flows into urceolus 6 (falling the stream tube).Cause severe to increase because urceolus 6 air contents relatively reduce, thus mixed solution at inner core 5 to the upper reaches, urceolus 6 is to dirty formation internal recycle, the severe difference of inside and outside tube mixed solution is the power that circulates.What pneumatic pump 11 produced discharges into the pressurized air of membrane bioreactor inner core 5 through aerating apparatus 7, provide the active sludge intermixture microorganism required oxygen on the one hand, the air-flow that rises along inner core 5 can wash away film silk 19 decelerating membrane pollutions on the other hand, prolonged the path that contacts of air water along the circulation gas current that inner core 5 rises with urceolus 6 descends, strengthen oxygen transfer, improved the utilization ratio of oxygen.Recycle pump or vacuum primingpump 4 that the present invention uses make processed sewage enter from the bottom of membrane bioreactor 6, between equalizing tank 3 and reactor 6, realize water cycle, mixed solution also will rise along inner core 5, increased the power that circulates, accelerated the flow velocity that liquid rises, thereby accelerated the relative movement between microorganism and the waste water greatly, strengthened effect of mass transmitting.Purify waste water to go out from baric flow from membrane module by suction pump 16 suctions or by the water level of membrane module 18 tops and the pressure reduction of rising pipe 13 between clear water tanks 17 water outlet place water levels of purifying waste water.Purify waste water through valve 12, purify water pipe 13, the flow meter 14 of purifying waste water, valve 15 inflow clear water tanks 17.When purifying waste water when extruding discharge and can not meet the demands, valve-off 15 is opened suction pump 16, and making purifies waste water enters cleaned water tank 17 by suction pump 16 suctions.
The inventive method combines the advantage of internal circulation biological reactor and the strainability of film, can under the condition of the present equal aeration rate of integral type film biological reactor, obtain high crossflow velocity and reduce film and pollute, improve oxygen mass-transfer efficiency, effectively reduce water treatment energy consumption 12~30%.
Description of drawings
Fig. 1 is the process flow diagram of the described air-lift internal circulating membrane bioreactor water treatment of invention
Fig. 2 is the synoptic diagram of the used column-type film components of the described air-lift internal circulating membrane bioreactor of invention.
Fig. 3 is the used horizontally-arranged membrane module of the described air-lift internal circulating membrane bioreactor of invention.
Fig. 4 is influent quality and clearance.
Fig. 5 is air-lift internal circulating membrane bioreactor and the generally comparison of membrane bioreactor contamination resistance.
Fig. 6 is the change curve that three kinds of MBR stop inhaling membrane filtration pressure reduction.
Embodiment
The sewage treatment flow process is as shown in Figure 1:
The sewage disposal flow process comprises:
1). water inlet system: former water 1 enters equalizing tank 3 through grid or screen cloth 2, sends into the bottom of membrane bioreactor urceolus 6 through recycle pump or vacuum primingpump 4, rises along center inner core 5.
2). bio-reactor adopts complete hybrid activated sludge reactor, and reactor is made of plexi-glass tubular, is of a size of: urceolus 6 diameter 140mm, high 720mm, the middle diameter of installing is that 100mm, height are the inner core 5 of 300mm.Film unit adopts polysulfones (PS) hollow fiber film assembly 18 to be shaped as pillar, and length is 0.30m, membrane pore size 0.01 μ m, molecular weight cut-off 50 000, film filament diameter 1.3mm, 111 of new film film silks, membrane area 0.27m 2The aerating apparatus of being made up of perforated pipe and aerator 7 is housed under the membrane module 18, and two-part aeration rate can be regulated through valve 8 by air flowmeter 10.Aeration by aerating apparatus provides the active sludge microorganism decomposing organic matter in the reactor required oxygen, and active sludge intermixture has certain souring with the air-flow rising to the film surface simultaneously.The mixed solution that comes self-circulating pump or vacuum primingpump 4 enters along inner core 5 from the bottom of membrane bioreactor urceolus 6 and rises, increased the power that circulates, accelerated the flow velocity that liquid rises, thereby accelerated the relative movement between microorganism and the waste water greatly, strengthened effect of mass transmitting, the water level in the reactor is controlled liquid level by liquidometer.
3). outlet pipeline system purification water goes out from baric flow from membrane module by suction pump 16 suctions or by the water level and the pressure reduction of rising pipe 13 between clear water tanks 17 water outlet place water levels of purifying waste water above the membrane module.Purify waste water through valve 12, purify water pipe 13, the flow meter 14 of purifying waste water, valve 15 inflow clear water tanks 17.When purifying waste water when extruding discharge and can not meet the demands, valve-off 15 is opened suction pump 16, and making purifies waste water enters cleaned water tank 17 by suction pump 16 suctions.Water outlet is by automatic controlling system in the process of the test, and system adopts the method water outlet of intermittent suction, suction 12min, stop pumping 3min.
Sewage is taken from certain biotope sewage, through the air-lift internal circulating membrane bioreactor result as shown in Figure 4:
As shown in Figure 4, the influent quality fluctuation is bigger, and COD is between 182~728mg/L, and ammonia nitrogen is between 13.2~159.7mg/L, and turbidity is between 14~167NTU.But the clearance through gas stripping type internal recycle MBR reactor for treatment pollutent is all higher, and the COD average removal rate is 92%, and the ammonia nitrogen average removal rate is 97%, and the turbidity average removal rate is 99.5%.No matter the influent quality COD value that how to change the air-lift internal circulating membrane bioreactor treating water is lower than 50mg/L all the time, meets the reclaimed water standard.Air-lift internal circulating membrane bioreactor shows stable treated rate and treatment effect, and the anti-water quality and quantity impact capacity of reactor is strong.
Air-lift internal circulating membrane bioreactor preventing membrane pollution characteristic
This embodiment has compared in the membrane bioreactor of certain sludge concentration (average 7756mg/L), adopts the membrane module after certain way cleans, (17.5m under equal aeration intensity (2L/min), equal film packing density 2Film/m 2The reactor floor space), membrane module moves to severe contamination (the normalization method film is reduced to about 0.25 than flux) respectively in air-lift internal circulating membrane bioreactor and general membrane bioreactor, normalization method film is more separately seen Fig. 5 than the variation of flux and membrane module working time.Film is the membrane flux value under the unit filter pressure than flux, is normalized to film than the film of amount of flux and the new film ratio than amount of flux.
As seen from Figure 5:
The contamination resistance of membrane module is strong in air-lift internal circulating membrane bioreactor, and the normalization method film was reduced to 0.27 o'clock than flux, and membrane module can move 56 days in air-lift internal circulating membrane bioreactor, and the membrane module operation is 46 days in general membrane bioreactor.And membrane module remains on more than 0.40 than flux at preceding 47 days normalization method films of operation in the air-lift internal circulating membrane bioreactor, can only keep 23 days in general membrane bioreactor.The product water efficient of the membrane module of air-lift internal circulating membrane bioreactor is higher like this, and equal membrane module can be handled more sewage, thereby reduces the investment of membrane module.
The present invention adopts aerator and perforated pipe mixed aeration mode, because it is 2.1 times of general membrane bioreactor that the effect of internal recycle makes the intermembranous liquid cross-flow flow velocity of air-lift internal circulating membrane bioreactor, high velocity flow has good souring to the film surface cake layer that forms the main resistance of membrane filtration, has alleviated storage effect in long-time running.Therefore air-lift internal circulating membrane bioreactor has alleviated the film pollution under the condition that does not increase energy consumption, is a kind of new membrane bio-reactor that is worthy of popularization.
Gas stripping type internal recycle MBR stops inhaling membrane filtration pressure reduction
Membrane bioreactor (MBR) stop inhaling the pollution level that membrane filtration pressure reduction can reflect film to a certain extent.MBR adopts the intermittent operation mode mostly, and during suction pump work, membrane filtration pressure reduction increases in aspiration procedure; When suction pump stops inhaling, owing to have filtration pressure difference inside and outside the film, water is entered in the film and membrane filtration pressure reduction is reduced.Stop inhaling membrane filtration pressure reduction and can describe the degree that film pollutes, because the membrane filtration pressure reduction when stopping inhaling can make water enter in the film, the water that enters in the film is many more, and pressure reduction is more little; And the film pollution is serious more, and the water that enters in the film is just few more, and it is big more then to stop to inhale membrane filtration pressure reduction.
Present embodiment compares in the changing conditions of inhaling membrane filtration pressure reduction with stopping in the air-lift internal circulating membrane bioreactor MBR of recycle pump water inlet and gas stripping type internal recycle MBR and the general MBR system membrane module.Membrane module is in a cleaning interval, and the stopping of three kinds of MBP systems inhales membrane filtration pressure reduction changing conditions as shown in Figure 6.
As shown in Figure 6, it is slower that the stopping of the gas stripping type internal recycle MBR of recycle pump water inlet inhales the climbing speed of membrane filtration pressure reduction, and pressure-difference fluctuation is less, shows that membrane module running condition is very stable, and the generation that film pollutes is slower.Because after using recycle pump, the air water two-phase flow has formed the intensive turbulent flow on the film surface, the pollutent on film surface there is good removal effect, effectively alleviated the film pollution level.The climbing speed that stops inhaling membrane filtration pressure reduction by three kinds of MBR systems relatively as can be known, recycle pump water inlet gas stripping type internal recycle MBR stops inhaling membrane filtration pressure reduction and reduces nearly 70% than gas stripping type internal recycle MBR, climbing speed than general MBR filtration pressure difference has reduced by 86%, it is slow to illustrate that recycle pump water inlet gas stripping type internal recycle MBR film pollutes speed, is a kind of novel reactor of excellent property.

Claims (2)

1. treating sewage by air-lift internal circulating membrane bioreactor device, comprise grid and screen cloth (2), equalizing tank (3), recycle pump or vacuum primingpump (4), membrane bioreactor inner core (5), membrane bioreactor urceolus (6), aerating apparatus (7), valve (8), blast main (9), air flowmeter (10), pneumatic pump (11), valve (12), purify water pipe (13), the flow meter (14) of purifying waste water, valve (15), suction pump (16), cleaned water tank (17), it is characterized in that having placed columnar membrane assembly (18) or horizontally-arranged membrane module (21) in the membrane bioreactor inner core (5), columnar membrane assembly (18) comprises film silk (19), film rising pipe (20); Former water (1) enters equalizing tank (3) through grid or screen cloth (2), enter the bottom of membrane bioreactor urceolus (6) through recycle pump or vacuum primingpump (4), membrane bioreactor inner core (5) and membrane bioreactor urceolus (6) are made up of two concentric cylinders, aerating apparatus (7) is located at the bottom of membrane bioreactor inner core (5), is full of active sludge intermixture in the reactor; The pressurized air that is produced by pneumatic pump (11) enters membrane bioreactor inner core (5) through air flowmeter (10), blast main (9) and valve (8) aerating apparatus (7) that stimulates the menstrual flow; Purify waste water through valve (12), purify water pipe (13), the flow meter (14) of purifying waste water, valve (15) inflow clear water tanks (17).
2. treating sewage by air-lift internal circulating membrane bioreactor method, it is characterized in that stimulating the menstrual flow aerating apparatus (7) when discharging into membrane bioreactor inner core (5) through air flowmeter (10), blast main (9) and valve (8) when the pressurized air that produces by pneumatic pump (11), because the pushing effect and wrapped folder and the mixing effect of pressurized air in water of gas, active sludge intermixture severe is reduced and make progress and flow, air pocket is overflowed after arriving the top, and the mixed solution that contains small bubbles then flows into membrane bioreactor urceolus (6); Because reducing relatively, urceolus membrane bioreactor (6) air content cause severe to increase, therefore mixed solution at membrane bioreactor inner core (5) to the upper reaches, to dirty formation internal recycle, the severe difference of inside and outside tube mixed solution is the power that circulates along membrane bioreactor urceolus (6); What pneumatic pump (11) produced discharges into the pressurized air of membrane bioreactor inner core (5) through aerating apparatus (7), provide the active sludge intermixture microorganism required oxygen on the one hand, the air-flow that rises along membrane bioreactor inner core (5) can wash away film silk (19) decelerating membrane pollution on the other hand, prolonged the path that contacts of air water along the circulation gas current that membrane bioreactor inner core (5) rises with membrane bioreactor urceolus (6) descends, strengthen oxygen transfer, improved the utilization ratio of oxygen; Recycle pump or vacuum primingpump (4) make processed sewage enter from the bottom of membrane bioreactor, between equalizing tank (3) and membrane bioreactor, realize water cycle, mixed solution rises along membrane bioreactor inner core (5), increased the power that circulates, accelerated the flow velocity that liquid rises, thereby accelerated the relative movement between microorganism and the waste water greatly, strengthened effect of mass transmitting; Purify waste water to go out from baric flow from membrane module by suction pump (16) suction or by water level and the pressure reduction of the rising pipe of purifying waste water (13) between clear water tanks (17) water outlet place water level above columnar membrane assembly (18) or the horizontally-arranged membrane module (21); Purify waste water through valve (12), purify water pipe (13), the flow meter (14) of purifying waste water, valve (15) inflow clear water tanks (17); When purifying waste water when extruding discharge and can not meet the demands, valve-off (15) is opened suction pump (16), and making purifies waste water enters cleaned water tank (17) by suction pump (16) suction.
CNA2006101138512A 2006-10-19 2006-10-19 Apparatus and method for treating sewage by air-lift internal circulating membrane bioreactor Pending CN1935689A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105246836A (en) * 2013-05-30 2016-01-13 住友电气工业株式会社 Filtration device, and filtration method using same
CN108676709A (en) * 2018-05-11 2018-10-19 同济大学 The gas stripping type reactor and process of single cell protein are synthesized for yellow wine lees and rice milk mixed fermentation
CN108892232A (en) * 2018-07-05 2018-11-27 嘉兴市盛翔织造有限公司 A kind of membrane bioreactor cleared up automatically
CN111977786A (en) * 2020-09-18 2020-11-24 广东粤海水务投资有限公司 Double-aeration aerobic granular sludge-membrane bioreactor coupling device and application thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105246836A (en) * 2013-05-30 2016-01-13 住友电气工业株式会社 Filtration device, and filtration method using same
CN108676709A (en) * 2018-05-11 2018-10-19 同济大学 The gas stripping type reactor and process of single cell protein are synthesized for yellow wine lees and rice milk mixed fermentation
CN108892232A (en) * 2018-07-05 2018-11-27 嘉兴市盛翔织造有限公司 A kind of membrane bioreactor cleared up automatically
CN108892232B (en) * 2018-07-05 2021-02-26 嘉兴市盛翔织造有限公司 Automatic membrane bioreactor who clears up
CN111977786A (en) * 2020-09-18 2020-11-24 广东粤海水务投资有限公司 Double-aeration aerobic granular sludge-membrane bioreactor coupling device and application thereof

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