CN203474590U - Two-stage submerged membrane bioreactor - Google Patents
Two-stage submerged membrane bioreactor Download PDFInfo
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- CN203474590U CN203474590U CN201320549257.3U CN201320549257U CN203474590U CN 203474590 U CN203474590 U CN 203474590U CN 201320549257 U CN201320549257 U CN 201320549257U CN 203474590 U CN203474590 U CN 203474590U
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Abstract
The utility model belongs to the fields of a sewage treatment technology and a membrane separation technology for environmental protection. The utility model provides a novel two-stage submerged membrane bioreactor aiming at the problems of low water yield of the membrane bioreactor, complicated cleaning process and short service life of a membrane component due to the fact that the membrane component of the membrane bioreactor in the prior art is easily polluted. The two-stage submerged membrane bioreactor comprises a biological reaction tank, a membrane separation pond and a primary filter, wherein a primary filter net is arranged inside the biological reaction tank; the biological reaction tank is partitioned into an upper pond and a lower pond; a microorganism capable of decomposing a pollutant is added to the upper pond; adsorbing filler is added to the lower pond. The biological reaction tank and the membrane separation pond are partitioned by the primary filter; sewage enters the upper pond of the biological reaction tank, is filtered by the primary filter after being decomposed by the microorganism, enters the lower pond of the bioreactor, and then enters the membrane separation pond to be separated by a membrane separation apparatus. According to the two-stage submerged membrane bioreactor provided by the utility model, a primary filtering system is additionally arranged before the membrane separation, and a sludge flocculation body and particulate matters, which have large particle sizes are intercepted inside the biological reaction tank, so that the pollution of the membrane component is significantly reduced, not only can the service life of the membrane component be prolonged, but also the membrane flux and the water yield in the use process are increased, and the energy and purified water required for aeration and backwash for cleaning the membrane component can be reduced.
Description
Technical field
The invention belongs to sewage disposal technology and the membrane separation technique field of environment protection, particularly a kind of submerged membrane bio-reactor, and the method for using this membrane bioreactor purifying treatment sewage.
Background technology
Membrane bioreactor (Membrane Bio-Reactor, MBR) be by the Novel waste water treatment system of membrane separation technique and biologic treating technique combination, the membrane module of usining replaces the secondary sedimentation basins in traditional biological treatment technology as mud-water separation unit, has the advantages such as floor space is little, effluent quality good, operational management is simple.Membrane bioreactor utilizes membrane separation plant that active sludge and larger molecular organics are trapped in bio-reactor, realization response device hydraulic detention time (HRT) is complete separated with sludge age (SRT), in bio-reactor, keep high reactivity sludge concentration, improve biological treatment organic loading, thereby reduce sewage treatment facility floor space, and by keeping low sludge loading to reduce surplus sludge volume.
Active sludge intermixture is complicated and serious to the pollution of membrane module, solid particulate in waste water, organic macromolecule, dissolved matter and microorganism species and metabolite thereof form flocs unit and deposit and be adsorbed on film surface, form the very strong gel coat of adhesion, and constantly accumulate and form obstruction.Film pollution not only increases filtration resistance, has reduced membrane flux, thereby has reduced water production rate; Further, need gas and the hydrodynamic cleaning device of increase for controlling diaphragm pollutes, cause equipment energy consumption very large, operation and maintenance expense is high, becomes the major obstacle of restriction membrane Bio-reactor Technology commercial applications development.
Research shows, traditional active sludge treatment process is different from the distribution of sizes of the flocs unit of mud in membrane bioreactor, in traditional active sludge treatment process, the average particle size particle size of activated sludge floc is approximately 160 microns, and in membrane bioreactor, the average particle size particle size of activated sludge floc is about 240 microns.Further,, there is Double-peak Phenomenon at 5～20 microns and 240 microns of annexes in the size distribution of activated sludge floc in membrane bioreactor.In membrane bioreactor, the distribution of sizes of activated sludge floc is in 10～40 micrometer ranges, and median size is about 25 microns.
Therefore, to existing membrane biological reactor process, if increased primary filter system before membrane sepn, the activated sludge floc of greater particle size and particulate matter are stopped, make it can not enter membrane separation assemblies, just can greatly reduce the pollution to membrane module, thereby increase the life-span of water production rate, membrane component and prolong, reduce operation and maintenance cost.
Chinese patent " film filter of double filtration " (201210052668.1), " film filter of pasture and water formula double filtration " (201210052670.9) propose the film filter of double filtration; many capillaries film is crossed the protection of filter ruffle parcel by a screen cloth, to solve the problem of capillary membranes root fragility.The key distinction of these two patents is only that whether one end is sealed, and all points out in specification sheets: screen cloth cross filter ruffle return circular diameter to be greater than 50mm time its internal membrane silk between pollutent be difficult to remove by backwash; When crossing filter ruffle and/or surperficial dirty the blocking up of capillary membranes, screen cloth can recover filtration efficiency by backwash or matting.As can be seen here, although this screen cloth is crossed the effect that filter ruffle also plays primary filter, energy filter fiber material is to avoid contacting winding with capillary membranes; But as this film filter is used for to submerged membrane bio-reactor, not only biological sludge can not be trapped within biological reaction tank, can, after entering screen cloth and crossing in filter ruffle, because screen cloth is crossed the resistance of filter ruffle and cannot be removed by backwash, thereby increase the pollution to film surface on the contrary.
Chinese patent " membrane bioreactor " (200410054983.3) proposes a kind of membrane bioreactor that comprises pre-filtering layer, disturbing flow device and microbial film unit, approximately 50～200 microns, the aperture of its pre-filtering layer, approximately 0.01～0.4 micron, the aperture of microbial film unit.This patent utilization pre-filtering layer tentatively filters out most suspended particulates in sewage, is attached on the film of microbial film unit to reduce suspended substance, to reduce the dirt of this film, blocks up.But microbial film unit wherein as the carrier of attached growth of microorganisms, makes the mud that is rich in microorganism and metabolite thereof be attached to membrane module surface, will deposit and be blocked in film surface after accumulation simultaneously.
Summary of the invention
The problem to be solved in the present invention is that the membrane module that overcomes submerged membrane bio-reactor in prior art easily pollutes, thereby cause the reduction of membrane reactor water production rate, cleaning process complexity, short problem of membrane module life-span, a kind of technical scheme of novel twin-stage submerged membrane bio-reactor is provided, by prime filter, biological reaction tank and membrane sepn pond are separated, to reduce the pollution of biological sludge to membrane module.
For solving above technical problem, the technical scheme that the present invention takes is:
A twin-stage submerged membrane bio-reactor, comprises biological reaction tank, membrane sepn pond and prime filter, and described membrane sepn is provided with membrane sepn device in pond, it is characterized in that:
(1) in biological reaction tank, be provided with primary filter net, biological reaction tank is divided into upper storage reservoir and lower storage reservoir;
(2) in the upper storage reservoir of described biological reaction tank, be added with the microorganism of energy decomposing pollutant, in lower storage reservoir, be added with adsorption stuffing;
(3) sewage enters the upper storage reservoir of biological reaction tank, after microorganism disaggregating treatment, through the filtration of prime filter, enters the lower storage reservoir of bio-reactor, enters membrane sepn pond separated by membrane sepn device under water level pressure reduction or pump-absorb action again.
Through the filtration of prime filter, biological sludge is trapped within biological reaction tank, do not enter membrane sepn pond, thereby avoid or reduced the pollution of biological sludge to membrane module.
Preferably, described twin-stage submerged membrane bio-reactor, is characterized in that, the filtering accuracy of described membrane sepn device is between 0.01～1 micron, and the filtering accuracy of described prime filter is between 3～100 microns.Further, 1) when the filtering accuracy of membrane sepn device is between 0.01～0.1 micron, the filtering accuracy of prime filter is between 3～20 microns; 2) when the filtering accuracy of membrane sepn device is between 0.1～1 micron, the filtering accuracy of prime filter is between 10～50 microns.
The effect of prime filter is filter and hold back biological sludge, and prime filter can be millipore filter, and filter material is made by metal screen, nylon leaching net, ceramic element, microfiltration membrane or non-woven fabrics, so prime filter more easily cleans than membrane module.
In described biological reaction tank lower storage reservoir, be added with adsorption stuffing, profile is particulate state, Powdered or block, the porous material that the preferred equivalent diameter of filler is 1～5 millimeter.
Preferably, described twin-stage submerged membrane bio-reactor is also provided with the washing unit of prime filter, it is characterized in that, described washing unit is gas purging device, or hydrodynamic cleaning device, or mechanical scrub device, or vibration washing device.Washing unit can reduce the pollution of biological sludge to prime filter.Even if prime filter stops up and causes pressure reduction increase, aquifer yield to reduce because of chronic pollution, in the time of can not regenerating by on-line cleaning device again, as long as prime filter is pulled down by off-line and cleaned or changed, just can recover rapidly the sewage disposal performance of membrane bioreactor.
Further, in described biological reaction tank, primary filter net below be provided with gas purging device, gas purging device both cleans for the purging of prime filter, also for the aeration of biological reaction tank.The distance of the shower nozzle of described gas purging device and primary filter net is 0～0.5cm.
The technical scheme of twin-stage submerged membrane bio-reactor provided by the invention, by prime filter, biological reaction tank and membrane sepn pond are separated, biological sludge is trapped within biological reaction tank, significantly reduced the pollution of biological sludge to membrane module, work-ing life that not only can membrane component and prolong, improve membrane flux and water production rate in use procedure, and can reduce aeration and required energy and the water purification of back flushing of rinsing membrane module.
With reference to appended accompanying drawing, and the explanation of following embodiment, be appreciated that object of the present invention, feature and effect.
Accompanying drawing explanation
Figure 1 shows that a kind of schematic diagram of membrane bioreactor of prior art.
Figure 2 shows that the schematic diagram of twin-stage submerged membrane bio-reactor.
Embodiment
Embodiment mono-:
A kind of schematic diagram of membrane bioreactor of prior art as shown in Figure 1.
In membrane bioreactor 101, be provided with membrane sepn device 102 and the active sludge that is rich in aerobic microbiological.Pending sewage, from water-in 103 enters membrane bioreactor 101 and carries out a biological disposal upon, is discharged from water outlet 105 under the suction function of production fluid pump 104.In membrane bioreactor 101, be also provided with aeration plate 107, air pumps into membrane bioreactor by aeration plate 107 under the effect of gas blower 106, decomposes the speed of response of dirty water pollutant to improve aerobic microbiological.
In engineering practice membrane bioreactor, be also provided with reverse aeration or the counterflush system of membrane sepn device, to reduce the pollution of active sludge to film surface.
Embodiment bis-:
Accompanying drawing 2 is schematic diagrams of a kind of twin-stage submerged membrane bio-reactor of implementing according to technical scheme provided by the invention.
A twin-stage submerged membrane bio-reactor, comprises biological reaction tank 201, membrane sepn pond 202 and primary filter net 204.Primary filter net 204 is arranged in biological reaction tank 201, and biological reaction tank 201 is divided into upper storage reservoir and lower storage reservoir.In upper storage reservoir, be added with the microorganism of energy decomposing pollutant, energy decomposing pollutant; In lower storage reservoir, be added with adsorption stuffing, can adsorb finely ground particles; In membrane sepn pond 202, be provided with membrane sepn device 203.Biological reaction tank 201 setting adjacent with membrane sepn pond 202 is provided with communicating aperture 210 below adjacent separator.
The effect of primary filter net is filter and hold back biological sludge, and primary filter net can be millipore filter, and filter material is made by metal screen, nylon leaching net, ceramic element, microfiltration membrane or non-woven fabrics, so primary filter net more easily cleans than membrane module.In described biological reaction tank lower storage reservoir, be added with porous adsorption stuffing, profile is particulate state, Powdered or block, 1～5 millimeter of equivalent diameter.
Sewage flows into the upper storage reservoir of biological reaction tank 201 from water-in 205, in upper storage reservoir, by after microorganism disaggregating treatment, through the filtration of primary filter net 204, enter the lower storage reservoir of bio-reactor under action of gravity.Production fluid pump 206 produces negative pressure the water in membrane sepn pond 202 is extracted out from the inner core of membrane sepn device 203, makes biological reaction tank 201 and the liquid level in membrane sepn pond 202 have difference of altitude.Sewage in biological reaction tank 201, under the effect of water level pressure reduction, enters membrane sepn pond 202 from communicating aperture 210, after 203 separation of membrane sepn device, under pump function, from water outlet 207, discharges.
Twin-stage submerged membrane bio-reactor is also provided with the washing unit of prime filter, can reduce the pollution of biological sludge to prime filter.Described washing unit is gas purging device, or hydrodynamic cleaning device, or mechanical scrub device, or vibration washing device.Particularly, in described biological reaction tank, primary filter net below be provided with gas purging device 208, gas purging device both cleans for the purging of prime filter, also for the aeration of biological reaction tank.Air is under the effect of gas blower 209, one route aeration plate pumps into membrane sepn pond, another route gas purging device 208 sprays to primary filter net 203 and purges, then through primary filter net 204, enter to microbial reaction district, for aerobic microbiological provides oxygen, to improve aerobic microbiological, decompose the speed of response of dirty water pollutant.The distance of the shower nozzle of described gas purging device and primary filter net is 0～0.5cm.
The filtering accuracy of described membrane sepn device is between 0.01～1 micron, and preferred value is the microfiltration membrane in 0.2～0.5 micron, aperture or the ultra-filtration membrane that aperture is 0.04～0.1 micron.
The effect of described prime filter is filter and hold back biological sludge, and filter material is made by metal screen, nylon leaching net, ceramic element, microfiltration membrane or non-woven fabrics, and filtering accuracy is conventionally between 3～100 microns.Experimental study shows: 1) when the filtering accuracy of prime filter is less than 3 microns, little for the impact of membrane module water production rate, this also shows that film surface contamination degree is lower, but the now pollution of prime filter and obstruction are comparatively serious, and pressure reduction raises very fast; 2) when the filtering accuracy of prime filter is greater than 20 microns, although macrobead activated sludge floc is stopped, but the colloid that some particle diameters are less, macromole still can pass through, this is the principal pollutant of membrane module just also, therefore film surface still can be polluted gradually, but the speed that transmembrane pressure increases slows down while also prime filter not being installed.
Further, consider the filtering accuracy of prime filter and the filtering accuracy of membrane sepn device is studied and optimizes, result is very complicated.In general, when membrane sepn device aperture reduces, the filtering accuracy of prime filter also will suitably improve, and the aperture of prime filter also will suitably reduce, but this also bring the obstruction of prime filter serious, pressure reduction increases.Through the screening of lot of experiments, the membrane sepn device for filtering accuracy between 0.1～1 micron, the filtering accuracy of supporting prime filter is that the effect of 10～50 microns is better; And for filtering accuracy the membrane sepn device between 0.01～0.1 micron, the filtering accuracy of supporting prime filter is that the effect of 3～20 microns is better.
Claims (5)
1. a twin-stage submerged membrane bio-reactor, comprises biological reaction tank, membrane sepn pond and prime filter, and described membrane sepn is provided with membrane sepn device in pond, it is characterized in that:
(1) in biological reaction tank, be provided with primary filter net, biological reaction tank is divided into upper storage reservoir and lower storage reservoir;
(2) in the upper storage reservoir of described biological reaction tank, be added with the microorganism of energy decomposing pollutant, in lower storage reservoir, be added with adsorption stuffing;
(3) sewage enters the upper storage reservoir of biological reaction tank, after microorganism disaggregating treatment, through the filtration of prime filter, enters the lower storage reservoir of bio-reactor, enters membrane sepn pond separated by membrane sepn device under pressure reduction or pump-absorb action again.
2. twin-stage submerged membrane bio-reactor according to claim 1, is provided with the washing unit of described prime filter, it is characterized in that, described washing unit is gas purging device, or hydrodynamic cleaning device, or mechanical scrub device, or vibration washing device.
3. twin-stage submerged membrane bio-reactor according to claim 2 is provided with gas purging device below primary filter net, it is characterized in that, the distance of the shower nozzle of described gas purging device and primary filter net is 0～0.5cm.
4. twin-stage submerged membrane bio-reactor according to claim 1, is characterized in that 1) when the filtering accuracy of membrane sepn device is between 0.01～0.1 micron, the filtering accuracy of prime filter is between 3～20 microns; 2) when the filtering accuracy of membrane sepn device is between 0.1～1 micron, the filtering accuracy of prime filter is between 10～50 microns.
5. twin-stage submerged membrane bio-reactor according to claim 1, is characterized in that, the filter material of described prime filter is made by metal screen, ceramic element, microfiltration membrane or non-woven fabrics.
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| CN201320549257.3U CN203474590U (en) | 2013-09-04 | 2013-09-04 | Two-stage submerged membrane bioreactor |
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| CN201320549257.3U CN203474590U (en) | 2013-09-04 | 2013-09-04 | Two-stage submerged membrane bioreactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776526A (en) * | 2016-03-25 | 2016-07-20 | 中国海洋大学 | Anaerobic membrane bioreactor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776526A (en) * | 2016-03-25 | 2016-07-20 | 中国海洋大学 | Anaerobic membrane bioreactor |
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