CN103936138B - Aeration system of MBR (Membrane Bio-Reactor) membrane module and control method of aeration system - Google Patents
Aeration system of MBR (Membrane Bio-Reactor) membrane module and control method of aeration system Download PDFInfo
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- CN103936138B CN103936138B CN201410189713.7A CN201410189713A CN103936138B CN 103936138 B CN103936138 B CN 103936138B CN 201410189713 A CN201410189713 A CN 201410189713A CN 103936138 B CN103936138 B CN 103936138B
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Abstract
The invention discloses an aeration system of an MBR (Membrane Bio-Reactor) membrane module and a control method of the aeration system, and aims to solve the problem of easily-caused environment pollution or high aeration energy consumption or short service life of the MBR membrane module in the traditional aeration system of the MBR membrane module. The aeration system of the MBR membrane module comprises an MBR aeration manifold, an upper-layer aeration manifold, a lower-layer aeration manifold, a plurality of upper-layer aeration branch pipes and a plurality of lower-layer aeration branch pipes, wherein the MBR aeration manifold is arranged in an MBR tank; the upper-layer aeration manifold and the lower-layer aeration manifold are communicated with the MBR aeration manifold; the plurality of upper-layer aeration branch pipes are communicated with the upper-layer aeration manifold; the plurality of lower-layer aeration branch pipes are communicated with the lower-layer aeration manifold; the plurality of upper-layer aeration branch pipes are located on the same horizontal plane which is 400-450mm far away from the bottom of the MBR tank; the plurality of lower-layer aeration branch pipes are located on the same horizontal plane which is 150-250mm far away from the bottom of the MBR tank. The aeration system disclosed by the invention can be used for effectively controlling membrane pollution by using relatively low air flow.
Description
Technical field
The present invention relates to a kind of MBR membrane module aerating system and control method.
Background technology
MBR membrane bioreactor is combined at activated sludge process and membrane separation technique, replaces the sewage disposal novel method of second pond in traditional conventional activated sludge method with membrane separation technique.Compared with traditional activated sludge process, it is good and stable that it has effluent quality, and excess sludge production is few, and floor space is little, be easy to install, many advantages such as operation is convenient.Meanwhile, in actual application, also there are some problems, as easy pollution, energy consumption is high, and the life-span is relatively short.
The method that controlling diaphragm pollutes has a lot, and wherein, a kind of topmost method utilizes continuous aeration to wash away film surface.In order to reach the effect that controlling diaphragm pollutes, the air capacity required for aeration is at least 20:1 with the ratio of the process water yield, thus causes operation energy consumption greatly to increase.Find by carrying out analysis to the operation energy consumption of actual MBR engineering, aeration energy consumption at least accounts for about 80% of total energy consumption.In addition, aeration intensity is excessive, also there will be the problems such as film silk fracture, thus have impact on the work-ing life of MBR film.Therefore, the focus that aeration rate is research how is reduced under the prerequisite polluted at effective controlling diaphragm.
At present, by research and the summary to engineering experience, mainly contain the method for following several reduction aeration rate: one is that intermittent aeration replaces continuous aeration, air pulse is utilized to clean film, thus reduce the energy consumption of aerating system, reduce operation and maintenance cost, but this method there is certain limitation, when some MBR film runs, must continuous aeration be carried out.Another kind method is that membrane module aeration divides long-time low intensity aeration and short period of time superstrength aeration, and result shows: the aeration energy consumption that can reduce 5%-8% under the prerequisite not affecting effluent quality and membrane flux.This method Problems existing is, when actual motion, for how determining that the concrete air capacity of low intensity aeration and superstrength aeration comparatively bothers; And Fan Selection must meet the requirement of superstrength aeration, adds somewhat to facility investment; In addition, superstrength aeration also can have a certain impact for the life-span of film silk.
Summary of the invention
In order to overcome existing MBR membrane module aerating system or easily polluted membrane pollution, or aeration energy consumption is high, or the deficiency causing the MBR membrane module life-span short, the present invention aims to provide a kind of MBR membrane module aerating system and control method, and this aerating system utilizes less tolerance to pollute by effective controlling diaphragm.
To achieve these goals, the technical solution adopted in the present invention is:
A kind of MBR membrane module aerating system, comprises the MBR aeration house steward be placed in MBR pond; Its constructional feature also comprises the upper strata aeration be communicated with MBR aeration house steward to be responsible for and lower floor's aeration is responsible for, and is responsible for upper strata aeration the many upper strata aeration branch pipes be communicated with, and be responsible for lower floor aeration the Duo Gen lower floor aeration branch pipe be communicated with; Many upper strata aeration branch pipes are positioned in the same level of 400mm ~ 450mm at the bottom of distance MBR pond, and Duo Gen lower floor aeration branch pipe is positioned in the same level of 150mm ~ 250mm at the bottom of distance MBR pond.
Thus, the MBR aeration house steward be connected with pneumatic pump can realize the air feed that upper strata aeration is responsible for and lower floor's aeration is responsible for, by being responsible for air feed in turn to upper strata aeration supervisor and lower floor's aeration, making to reduce aeration rate under the prerequisite of continuous aeration, reaching the object of consumption reduction.
Be below the technical scheme of further improvement of the present invention:
In order to improve aeration effect, described upper strata aeration branch pipe is all consistent with the quantity of MBR membrane module with the quantity of lower floor's aeration branch pipe.
Preferably, the caliber of described upper strata aeration branch pipe and lower floor's aeration branch pipe is DN15.
In order to improve aeration effect, described upper strata aeration branch pipe and lower floor's aeration branch pipe are all positioned at immediately below MBR membrane module bottom header.
Preferably, 430mm at the bottom of aeration branch pipe distance MBR pond, described upper strata, 200mm at the bottom of described lower floor aeration branch pipe distance MBR pond.
Conveniently control aeration, aeration supervisor in described upper strata is equipped with upper strata aeration tube pneumavalve, described lower floor aeration supervisor is equipped with lower floor's aeration tube pneumavalve.
Further, the middle aeration supervisor of at least one deck is also provided with between described upper strata aeration supervisor and lower floor aeration supervisor, each middle aeration supervisor is communicated with described MBR aeration house steward, and in the middle of every layer, aeration supervisor is communicated with the middle aeration branch pipe of many of being positioned in same level.
Conveniently understand aeration rate, described MBR aeration house steward is equipped with air flowmeter.
To the method that above-mentioned MBR membrane module aerating system controls, MBR membrane module filters the mode of employing interval water outlet, takes out and stops than being 8min/2min, namely produces water 8min, stops producing water 2min, and 10min is that a product water takes out the cycle of stopping; Be characterized in, described upper strata aeration supervisor and lower floor's aeration are responsible for cyclic aeration in turn, and aeration time change-over period of upper strata aeration supervisor and lower floor aeration supervisor and produce water to take out the cycle of stopping consistent, the ratio of the aeration time that the aeration time of upper strata aeration supervisor and lower floor aeration be responsible fors is 6:4, and MBR membrane module stop 2min when producing water during described lower floor aeration be responsible for aeration.
Thus, MBR membrane module aerating system of the present invention forms the continuous aeration of each MBR membrane module and the operational mode of MBR membrane module local intermittent pulse aeration, both ensure that MBR membrane module can obtain washing away of air always, the mode of air pulse can be utilized again to carry out disturbance to the different sites of film silk, therefore, less tolerance is utilized to pollute by effective controlling diaphragm.
Further, described MBR membrane module stops carrying out automatic clear water backwash, backwash time 30s ~ 60s during water outlet.
Above structure, the present invention by improving the aeration structure of MBR membrane module, and devises a set of autocontrol method matched.Make to reduce aeration rate under the prerequisite of continuous aeration, it is convenient that operation runs, and do not increase facility investment, can reduce aeration energy consumption while not affecting film work-ing life.
Compared with conventional single layer aeration, the beneficial effect of this aerating system is:
1, save air capacity 15 ~ 20%, account for 80% for the treatment of system total energy consumption according to MBR film aeration energy consumption, whole treatment system can reduce the energy consumption of 12% ~ 16%;
2, aeration rate is less, is conducive to the prolongation in film silk work-ing life;
3, aeration rate is little, and the corresponding reduction of Fan Selection, saves facility investment;
4, often overlap aerating system and only need increase operated pneumatic valve and some aeration tubes, the cost increased is very little.
Below in conjunction with drawings and Examples, the present invention is further elaborated.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of one embodiment of the invention;
Fig. 2 is the side-view of Fig. 1;
Fig. 3 is the front view of Fig. 1
In the drawings
1-MBR aeration house steward; 2-lower floor aeration tube pneumavalve; 3-upper strata aeration tube pneumavalve; 4-lower floor aeration house steward; 5-upper strata aeration house steward; 6-lower floor aeration branch pipe; 7-upper strata aeration branch pipe; 8-vapor pipe; 9-vent valve; 10-MBR membrane module; 11-header; 12-MBR membrane module support; 13-air flowmeter.
Embodiment
A kind of MBR membrane module aerating system, as Fig. 1,2, shown in 3, point upper and lower two-layer layout, 150 ~ 250mm at the bottom of lower floor's aeration tube distance pond, determines that a preferred value is 200mm, and 400 ~ 450mm at the bottom of upper strata aeration tube distance pond, determines that a preferred value is 430mm.
Every layer of aeration tube comprises aeration house steward and aeration branch pipe, and house steward and arm adopt dendritic layout.Arm quantity is consistent with the quantity of membrane module, and is arranged on immediately below membrane module bottom header.Aeration branch pipe caliber DN15, house steward's caliber is determined according to design tolerance.
Upper and lower two-layer aeration is responsible for one end and is connected with pneumatic pump, and every root aeration house steward installs an operated pneumatic valve; The other end is connected with vapor pipe, and vapor pipe arranges manual exhaust valve, for the air of equipment debugging and emptying internal system.
This aerating system is fully automatic operation, and its control mode is: blower fan continuous gas entry, and variable frequency control blower fan is in a suitable tolerance.The cyclic aeration of upper and lower two-layer aerating system is realized by the keying of operated pneumatic valve.Form the continuous aeration of each MBR membranous system and the operational mode of MBR local intermittent pulse aeration.Both ensure that MBR film can obtain washing away of air always, the mode of air pulse can be utilized again to carry out disturbance to the different sites of film silk, and therefore, utilized less tolerance to pollute by effective controlling diaphragm.
MBR membrane filtration adopts the mode of interval water outlet, takes out and stops than 8min/2min, namely produces water 8min, and stop producing water 2min, 10min is a cycle.Stop carrying out automatic clear water backwash, backwash time 30 ~ 60s during water outlet.Aeration time change-over period of upper and lower two-layer aerating pipelines and produce water to take out the cycle of stopping consistent, the ratio of upper strata aeration time and lower floor's aeration time is 6:4, and is lower floor's aeration mode of employing during ensureing to stop 2min when producing water.
application example:
The process water yield: sanitary sewage 100m
3/ d.
Influent quality: COD:500 ~ 600mg/L, BOD:200 ~ 300mg/L, NH3-NH4:30 ~ 40mg/L, SS:200 ~ 300mg/L.
Effluent quality: COD≤50mg/L, BOD≤10mg/L, NH3-NH4≤5mg/L, SS≤10mg/L.
Design variable and operational conditions: the technique adopting acidication+MBR.Acidication submersible agitating acc power 0.25KW; MBR membrane cisterna suction pump power 1.1kw.Conventional MBR membrane cisterna gas-water ratio comprises MBR membrane module gas-water ratio 20:1 and biochemical gas-water ratio 8:1, and total gas-water ratio is 28:1, and the blower power of needs is 3.0kw; Adopting novel MBR aeration clone to unite can make MBR membrane module gas-water ratio be down to 16:1 by 20:1, and total gas-water ratio is 24:1, and the blower power of needs is 2.2kw.
When adopting conventional MBR aeration, total operation power consumption of this treatment process is: 0.25+1.1+3=4.35kw, and ton water power consumption is 4.35kw.h/4.17t=1.04kw.h;
When adopting novel MBR aerating system, total operation power consumption of this treatment process is: 0.25+1.1+2.2=3.55kw, and ton water power consumption is 3.55kw.h/4.17t=0.85kw.h;
Save power consumption about 18.3%.Along with the increase of the process water yield, the power consumption saved also can increase.
Gas blower is variable frequency control, can suitably reduce according to the change of dissolved oxygen or increase aeration rate, but aeration rate can not be 0.Blower fan can cause the cut out of water producing pipe automatic valve when stopping.
The content that above-described embodiment is illustrated should be understood to these embodiments only for being illustrated more clearly in the present invention, and be not used in and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Claims (9)
1. the method that MBR membrane module aerating system is controlled, described MBR membrane module aerating system comprises the MBR aeration house steward (1) be placed in MBR pond, the upper strata aeration be communicated with MBR aeration house steward (1) is responsible for (5) and lower floor's aeration is responsible for (4), be responsible for the many upper strata aeration branch pipes (7) that (5) are communicated with upper strata aeration, and be responsible for lower floor aeration Duo Gen lower floor aeration branch pipe (6) that (4) be communicated with; Many upper strata aeration branch pipes (7) are positioned in the same level of 400mm-450mm at the bottom of distance MBR pond, and Duo Gen lower floor aeration branch pipe (6) is positioned in the same level of 150mm-250mm at the bottom of distance MBR pond; MBR membrane module (10) filters the mode of employing interval water outlet, takes out and stops than being 8min/2min, namely produces water 8min, stops producing water 2min, and 10min is that a product water takes out the cycle of stopping; It is characterized in that, described upper strata aeration supervisor (5) and lower floor aeration supervisor (4) cyclic aeration in turn, and the aeration time change-over period of upper strata aeration supervisor (5) and lower floor aeration supervisor (4) is with producing water, and to take out the cycle of stopping consistent, the ratio that aeration time and lower floor's aeration of upper strata aeration supervisor (5) be responsible fors the aeration time of (4) is 6:4, and during 2min when MBR membrane module (10) stops product water, described lower floor aeration is responsible for (4) aeration.
2. the method controlled MBR membrane module aerating system according to claim 1, it is characterized in that, described upper strata aeration branch pipe (7) is all consistent with the quantity of MBR membrane module (10) with the quantity of lower floor's aeration branch pipe (6).
3. the method controlled MBR membrane module aerating system according to claim 1, it is characterized in that, the caliber of described upper strata aeration branch pipe (7) and lower floor's aeration branch pipe (6) is DN15.
4. the method controlled MBR membrane module aerating system according to claim 1, it is characterized in that, described upper strata aeration branch pipe (7) and lower floor's aeration branch pipe (6) are all positioned at immediately below MBR membrane module bottom header (11).
5. the method controlled MBR membrane module aerating system according to claim 1, is characterized in that, 430mm at the bottom of aeration branch pipe (7) distance MBR pond, described upper strata, 200mm at the bottom of described lower floor aeration branch pipe (6) distance MBR pond.
6. the method that MBR membrane module aerating system is controlled according to claim 1, it is characterized in that, upper strata aeration tube pneumavalve (3) is equipped with on described upper strata aeration supervisor (5), lower floor's aeration tube pneumavalve (2) is equipped with in described lower floor aeration supervisor (4).
7. the method that MBR membrane module aerating system is controlled according to claim 1, it is characterized in that, the middle aeration supervisor of at least one deck is also provided with between described upper strata aeration supervisor (5) and lower floor's aeration supervisor (4), each middle aeration supervisor is communicated with described MBR aeration house steward (1), and in the middle of every layer, aeration supervisor is communicated with the middle aeration branch pipe of many of being positioned in same level.
8. the method controlled MBR membrane module aerating system according to claim 1, is characterized in that, described MBR aeration house steward (1) is equipped with air flowmeter (13).
9. according to the method controlled MBR membrane module aerating system one of claim 1-8 Suo Shu, it is characterized in that, described MBR membrane module (10) stops carrying out automatic clear water backwash, backwash time 30s-60s during water outlet.
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Families Citing this family (5)
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| CN104192982B (en) * | 2014-08-05 | 2017-02-08 | 中信环境技术（广州）有限公司 | MBR pulse aeration device free of extra power and aeration system with same |
| CN104108784B (en) * | 2014-08-07 | 2016-06-08 | 赵曙光 | A kind of MBR variable aerating method |
| CN105293687A (en) * | 2015-11-27 | 2016-02-03 | 湖北君集水处理有限公司 | Aeration device for high-concentration suspended matter submerged membrane component |
| CN110015751B (en) * | 2019-03-07 | 2022-04-29 | 博天环境集团股份有限公司 | Membrane component energy-saving aeration method of MBR system |
| CN115893646A (en) * | 2021-08-12 | 2023-04-04 | 南京工大膜应用技术研究所有限公司 | Be applied to aeration equipment of MBR membrane |
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| KR20100129517A (en) * | 2009-06-01 | 2010-12-09 | 주식회사 성환이엔티 | Gravity flow mbr for treatment of wastewater using metal membrane with macro pore size |
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