CN103466876A - External double-stage membrane bioreactor - Google Patents
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- CN103466876A CN103466876A CN2013103380493A CN201310338049A CN103466876A CN 103466876 A CN103466876 A CN 103466876A CN 2013103380493 A CN2013103380493 A CN 2013103380493A CN 201310338049 A CN201310338049 A CN 201310338049A CN 103466876 A CN103466876 A CN 103466876A
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Abstract
Based on problems of easy membrane assembly pollution, complex cleaning process and short membrane assembly service life of the membrane bioreactor, the present invention provides an external double-stage membrane bioreactor, which comprises a biological reaction tank, a primary filter and a membrane separation device, wherein the primary filter is placed inside the biological reaction tank, the membrane separation device is placed outside the biological reaction tank, and sewage is subjected to a decomposition treatment in the biological reaction tank through microorganisms, then is filtered through the primary filter, and enters the membrane separation device to be separated to obtain the clear liquid. According to the present invention, the membrane assembly and the large particle size contaminant are separated through the primary filter, and microorganism-rich active sludge and macromolecules are entrapped so as to significantly reduce pollution on the membrane assembly, reduce aeration for cleaning the membrane assembly and energy and purified water required by backwashing, avoid microorganism inactivation due to high-speed rotary shearing force of the water pump, improve membrane flux and water production, prolong the membrane assembly service life, and reduce operation cost and maintenance cost.
Description
Technical field
The invention belongs to sewage disposal technology and the membrane separation technique field of environment protection, particularly a kind of external membrane bioreactor, 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 the traditional biological treatment technology as the 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) and sludge age (SRT) separate fully, keep the high reactivity sludge concentration in bio-reactor, improve the biological treatment organic loading, thereby reduce the sewage treatment facility floor space, and hang down sludge loading by maintenance and reduce surplus sludge volume.
In engineering practice, the membrane bioreactor of widespread use is divided into built-in and two kinds of base types of external placed type.External placed type MBR adopts tubular membrane component usually, membrane module is separated to setting with bio-reactor, sewage is delivered to the filter end of membrane module through recycle pump, the clear liquid obtained through membrane sepn, and the pollutent tunicle of large-size is held back with concentrated solution and is back to bio-reactor.External placed type MBR system run all right is reliable, is easy to independent control and operational administrative, and membrane module is easy to dismounting, cleans and changes; But in external placed type MBR system, pollutent is in the deposition on film surface and seriously polluted, need larger circular flow to produce higher surperficial cross-flow flow velocity, therefore power charge is very high, and the shearing force of water pump high speed rotating generation can be destroyed the activity of certain micro-organisms thalline.
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 the film surface, form the very strong gel coat of adhesion, and constantly accumulate and form obstruction.The film pollution not only increases filtration resistance, has reduced membrane flux, thereby has reduced water production rate; Further, need the gas and the hydrodynamic cleaning device that increase for controlling diaphragm pollutes, cause equipment energy consumption very large, the operation and maintenance expense is high, becomes the major obstacle of restriction membrane Bio-reactor Technology commercial applications development.
Research shows, the traditional active sludge treatment process is different from the distribution of sizes of the flocs unit of mud in membrane bioreactor, in the 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 (Cabassud et.al, Submerged membrane bioreactors:Interactions between membrane filtration and biological activity, Proceedings of Water Environment-Membrane Technology Conference, Seoul, Korea, 2004).Further,, there is Double-peak Phenomenon in the size distribution of activated sludge floc in membrane bioreactor at 5～20 microns and 240 microns annexes.More research shows, in membrane bioreactor, the distribution of sizes of activated sludge floc is in 10～40 micrometer ranges, median size is about 25 microns (Bae et.al, Interpretation of fouling characteristics of ultrafiltration membrane during the filtration of membrane bioreactor mixed liquor, J.Membrane Sci., 2005, Vol.264).
Therefore, to existing membrane biological reactor process, if increased the 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.This method is for the external membrane bioreactor particularly important, not only can improve sewage disposal quality and water production rate, delay the pollution speed of film, and circular flow and system energy consumption significantly can be reduced, reduced the operation and maintenance cost, the technological line of external membrane bioreactor can be maximized favourable factors and minimized unfavourable ones.
Summary of the invention
The problem to be solved in the present invention is to overcome the membrane module of membrane bioreactor in prior art easily to pollute, thereby cause the reduction of membrane bioreactor water production rate, cleaning process complexity, short problem of membrane module life-span, a kind of technical scheme of novel external placed type twin-stage membrane bioreactor is provided, by prime filter, the activated sludge floc of greater particle size and particulate matter are stopped, to reduce the pollution to membrane module.
For solving above technical problem, the technical scheme that the present invention takes is: a kind of external placed type twin-stage membrane bioreactor, comprise biological reaction tank, prime filter and membrane sepn device, it is characterized in that: (1) described prime filter is placed in the inside of biological reaction tank, is provided with at least one water outlet; (2) described membrane sepn device is placed in the outside of biological reaction tank, is provided with at least one sewage inlet and a purified liquor outlet; (3) sewage, after biological reaction tank is by the microorganism disaggregating treatment, under the effect of water pump draft, after prime filter filters, enters the membrane sepn device from the water outlet of prime filter, and the clear liquid after the membrane sepn device separates is discharged from purified liquor outlet.
Preferably, described membrane sepn device also is provided with at least one sewage outlet, it is characterized in that, sewage enters the membrane sepn device from the sewage inlet of described membrane sepn device, part clear liquid is discharged from purified liquor outlet after the membrane sepn device separates, and another part concentrated solution is discharged from the sewage outlet of membrane sepn device.Distinguishingly, the membrane sepn device of described external membrane bioreactor can be also a pond that comprises membrane separation assemblies, does not establish independently sewage outlet, when the membrane cisterna water level during higher than design water level sewage get back to biological reaction tank by overflow weir/groove.
Preferably, the sewage that the described sewage outlet from the membrane sepn device is discharged, be back in described biological reaction tank, or send into other waste disposal plant and processed.The sewage of usually, discharging from the sewage outlet of membrane sepn device is directly sent back to bio-reactor and is formed circulation.But be provided with a plurality of biological reaction tanks when the MBR system, phegma not necessarily is admitted to that original biological reaction tank, also can be admitted to other biological reaction tank and forms systemic circulation.
External placed type twin-stage membrane bioreactor provided by the invention, prime filter is one or more filter disc assemblies, it is characterized in that 1) described filter disc assembly comprises framework and filter screen, filter screen is fixed on framework, forms an airtight cavity; 2) described filter disc assembly is provided with at least one water outlet; 3) sewage is under gravity or draft effect, and the inside cavity that enters the filter disk assembly part by described strainer filtering from the outside of described filter disc assembly is flowed out by the water outlet of filter disc assembly.Usually, the filter disc assembly is rectangle or circular sheet, and both sides cover filter screen, and other direction is sealed by framework, forms the cavity of airtight a, hollow.The structure of filter disc assembly, measure-alike, be convenient to installation and removal.
Further, at described filter disc assembly water outlet, also be provided with filter screen or filter core, in the inside cavity of described filter disc assembly, be added with particulate state, Powdered or block filler.Preferably, the porous material of 1～5 millimeter of filler equivalent diameter.The dosage of filler is 3～10% of spatial volume between double-layer leaching net, therefore dense packing not, but flow in the cavity of filter disc assembly.Described filter screen or the filter core of being located at water outlet, preferred PP filter core, active carbon filter core or ceramic element, its filtering accuracy is between 10～100 microns.Due to the filtering accuracy of primary filter net, usually to reach 5～10 times of membrane pore size even larger, and the pollutent of this scope only depends on the primary filter net effectively not tackle.Although have been reported and add protruded packing be conducive to improve water quality and decelerating membrane pollution in membrane bioreactor, but due to these filler distribution in biological reaction tank, with the mud that is rich in microorganism, coexist, thereby by the microorganism flocs unit, surrounded soon, and become the carrier of microorganism growth, thereby lost the obstruction ability to particulate pollutant.And be rich in microbic activity mud in the present invention, basically by the filter screen of prime filter, tackled, only have molecule could enter by the first floor filter screen inside cavity of filter disc assembly, so protruded packing is more good to obstruction performance and the effect of molecule.
External placed type twin-stage membrane bioreactor provided by the invention 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 10～100 microns.Further, the filtering accuracy of described prime filter, between 10～50 microns, can more effectively filter and hold back activated sludge floc and particulate matter.The effect of prime filter is to filter and hold back biological sludge, the filter material of prime filter by wire netting, nylon wire, ceramic element, open oriented and ordered fibrous braid or non-woven fabrics outward and make, so prime filter more easily cleans than membrane module.
External placed type twin-stage membrane bioreactor provided by the invention, be provided with the washing unit of described prime filter, it is characterized in that, described washing unit is the hydrodynamic cleaning device, or gas purging device, or the mechanical scrub device, or the vibration washing device.
Preferably, described external placed type twin-stage membrane bioreactor is provided with movable hydro-cleaning installation, and the screen surface of described prime filter is rinsed or aspirated.Described hydro-cleaning installation is positioned at the both sides of prime filter filter screen, comprises shower nozzle, connecting hose, guide rail and drive unit; One end of connecting hose communicates with shower nozzle, and the other end communicates with water pump; Described shower nozzle is pressed close to the screen surface of prime filter; Drive unit can drive shower nozzle along guide rail movement, and its direction of motion is parallel with the screen surface be cleaned.With topping-up pump, water is sprayed to screen surface, the mud punching that is deposited in screen surface can be removed; Also can the mud sucking-off by screen surface with suction pump, now shower nozzle is equivalent to suction and chews.
Preferably, described external placed type twin-stage membrane bioreactor is provided with movable mechanical scrub device, screen surface to prime filter is cleaned, it is characterized in that: 1) described mechanical scrub device comprises brush, guide rail and drive unit, and described brush is pressed close to the screen surface of prime filter; 2) drive unit drives brush along guide rail movement, and its direction of motion is parallel with the screen surface of being cleaned.
Further, described mechanical cleaning device and front hydrodynamic cleaning device are become one, can more effectively remove the tamper of primary filter net surface, reduce the pollution of primary filter net.
Preferably, the hydrodynamic cleaning device of described prime filter, is characterized in that, the sewage that the described sewage outlet from the membrane sepn device is discharged, under pump function, from the shower nozzle ejection of described hydrodynamic cleaning device, the screen surface of described prime filter is rinsed.Described hydrodynamic cleaning device is provided with at least two grades of different irrigation flow rate, it is characterized in that the operation rule of described hydrodynamic cleaning device comprises the combination of following one or more control law:
1) irrigation flow rate of described hydrodynamic cleaning device, periodically, according to high speed, low speed switchover operation, the accounting of the time of high-speed cruising is 2～20%;
2) described hydrodynamic cleaning device is movable hydro-cleaning installation, and hydro-cleaning installation moves back and forth and rinses every some cycles, when hydro-cleaning installation moves according to high-speed cruising;
3), when the pressure reduction of described prime filter is greater than set(ting)value, the hydrodynamic cleaning device is according to high-speed cruising.
The technical scheme of external placed type twin-stage membrane bioreactor provided by the invention, by prime filter, the membrane module in the external placed type biological reaction tank and large particle diameter pollutent are separated, to be rich in microbic activity mud and macromole is trapped in outside prime filter, significantly reduced the pollution of biological sludge to membrane module, not only can reduce aeration and required energy and the water purification of back flushing of rinsing membrane module, avoid water pump high-speed revolution shearing power to make microorganism deactivated, and can improve membrane flux and the water production rate in use procedure, the work-ing life of membrane component and prolong, reduced the operation and maintenance cost.
Usually, external membrane bioreactor can also be provided with back-purge system, gas flushing device, belongs to concrete technological design.Apply the technical scheme of external placed type twin-stage membrane bioreactor provided by the invention, even effective operation that back-purge system also can be realized membrane bioreactor is not set, but still need determine according to concrete application demand.
The accompanying drawing explanation
Figure 1 shows that a kind of schematic diagram of external membrane bioreactor of prior art
Figure 2 shows that a kind of schematic diagram of external placed type twin-stage membrane bioreactor
Figure 3 shows that the structural representation of external placed type twin-stage membrane bioreactor filter disc assembly
Figure 4 shows that the structural representation of external placed type twin-stage membrane bioreactor hydrodynamic cleaning device
Figure 5 shows that a kind of anaerobic-aerobic combines the schematic diagram of the external placed type twin-stage membrane bioreactor of use
Figure 6 shows that the structural representation of external placed type twin-stage membrane bioreactor flushing arrangement
Embodiment
With reference to appended accompanying drawing, and the explanation of following embodiment, be appreciated that purpose of the present invention, feature and effect.
Embodiment mono-:
A kind of schematic diagram of external membrane bioreactor of prior art as shown in Figure 1.
Membrane bioreactor comprises biological reaction tank 101 and external membrane sepn device 103, is rich in the active sludge of aerobic microbiological in biological reaction tank 101, and membrane sepn device 103 is a kind of tubular membrane.
Pending sewage is from water-in 104 enters biological reaction tank 101 and carried out a biological disposal upon, under the effect of recycle pump 106, from water outlet 105, discharge, enter the sewage inlet 107 of membrane sepn device 103, clear liquid after the membrane sepn device separates is discharged from purified liquor outlet 109, and the pollutent tunicle of large-size is held back, with concentrated solution, from the sewage outlet 108 of membrane sepn device 103, be back to bio-reactor.
Also be provided with aeration plate 112 in biological reaction tank 101, air pumps into membrane bioreactor by aeration plate 112 under the effect of gas blower 111, decomposes the speed of response of pollutent in sewage to improve aerobic microbiological.
In engineering practice membrane bioreactor, also be provided with reverse aeration or the counterflush system of membrane sepn device, to reduce the pollution of active sludge to the film surface.
Embodiment bis-:
Accompanying drawing 2 is schematic diagrams of a kind of external placed type twin-stage membrane bioreactor of implementing according to technical scheme provided by the invention.A kind of external placed type twin-stage membrane bioreactor, comprise biological reaction tank 201, prime filter 202 and membrane sepn device 203.
Prime filter 202 is one group of filter disc assembly, is placed in the inside of biological reaction tank 201.Accompanying drawing 3 has provided a kind of structural representation of filter disc assembly, and the filter disc assembly is rectangle or circular sheet, comprises framework 221 and filter screen 222,223, and filter screen is fixed on framework by welding, compression, clamping or alternate manner.Filter disc assembly both sides cover filter screen 222,223, and other direction is sealed by framework 221, form the cavity of airtight a, hollow.The below of every filter disc assembly all is provided with water outlet 224, at water outlet, also is provided with PP strainer 225, and its filtering accuracy is 10～50 microns.The inside cavity of filter disc assembly is added with particulate state, Powdered or block protruded packing, for absorption with stop and enter the molecule of filter disc assembly inside cavity by first floor filter screen.Typically, protruded packing is gac, molecular sieve or the flyash of 1～5 millimeter of equivalent diameter.Sewage is under gravity or draft effect, and the inside cavity that enters the filter disk assembly part by strainer filtering from the outside of described filter disc assembly, flowed out by the water outlet of filter disc assembly.The water outlet of each filter disc assembly, be communicated with the water outlet 205 that is concentrated to prime filter.The structure of filter disc assembly, measure-alike, be convenient to installation and removal.The concrete structure design details of filter disc assembly, can need to be designed to realize according to actual process.
The effect of prime filter is filter and hold back biological sludge, and the filter material of prime filter is made by wire netting, nylon wire, ceramic element, so prime filter more easily cleans than membrane module.The filtering accuracy of prime filter is between 10～100 microns.Further, activated sludge floc and particulate matter can more effectively be filtered and hold back to its preferred value, between 10～50 microns.
Sewage is after biological reaction tank 201 is by the microorganism disaggregating treatment, under the effect of water pump 206 drafts, after prime filter 202 filters, enter the sewage inlet 207 of membrane sepn device from the water outlet 205 of prime filter 202, clear liquid after the membrane sepn device separates is discharged from purified liquor outlet 209, and the pollutent tunicle is back to bio-reactor with concentrated solution from the sewage outlet 208 of membrane sepn device after holding back.
The external placed type twin-stage membrane bioreactor that the present embodiment provides, be provided with the washing unit of described prime filter.As shown in Figure 4, described hydro-cleaning installation 210 can move along the screen surface direction of prime filter, and the screen surface of described prime filter is rinsed or aspirated.Hydro-cleaning installation comprises shower nozzle 231, connecting hose 232, guide rail 233 and drive unit.Shower nozzle 231 is positioned at the both sides of prime filter filter screen, in the side towards filter screen, is provided with nozzle 236, presses close to the screen surface of prime filter, and preferred value is 0～1cm.One end of connecting hose 232 communicates with shower nozzle 231, and the other end communicates with water pump, with topping-up pump, water is sprayed to screen surface, the mud punching that is deposited in screen surface can be removed; Also can the mud sucking-off by screen surface with suction pump, now shower nozzle is equivalent to suction and chews.Drive unit comprises drive-motor 234, crawler belt 235 and supporting drive disk assembly, can drive shower nozzle along guide rail movement, and its direction of motion is parallel with the screen surface be cleaned, thereby drive shower nozzle, screen surface is rinsed back and forth.
External placed type twin-stage membrane bioreactor is provided with the hydro-cleaning installation 210 of described prime filter, it is characterized in that, the sewage that the described sewage outlet from the membrane sepn device 208 is discharged, under pump function, from the shower nozzle ejection of described hydrodynamic cleaning device, the screen surface of described prime filter is rinsed.Described hydrodynamic cleaning device is provided with at least two grades of different irrigation flow rate, and low speed, for normal filtration, at a high speed for the flushing filtering net surface, both can effectively have been removed screen surface and pollute, and can reduce system energy consumption again.The operation rule of described hydrodynamic cleaning device comprises the combination of following one or more control law:
1) irrigation flow rate of described hydrodynamic cleaning device, periodically, according to high speed, low speed switchover operation, the accounting of the time of high-speed cruising is 2～20%.Preferably, the flow velocity of low speed gear is 0.4～0.8m/s, and the flow velocity of high gear is 0.05～0.2m/s; First rinse at a high speed 0.5～1min, then rinse 5～10min with low speed, so circulation.
2) described hydrodynamic cleaning device is movable hydro-cleaning installation, and hydro-cleaning installation moves back and forth and rinses every some cycles, when hydro-cleaning installation moves according to high-speed cruising.Particularly, hydro-cleaning installation moves back and forth every 15～30min, screen surface is rinsed to 1～3min, now according to high-speed cruising; Then hydro-cleaning installation stops, now according to low cruise.
3), when the pressure reduction of described prime filter is greater than set(ting)value, the hydrodynamic cleaning device is according to high-speed cruising.
External placed type twin-stage membrane bioreactor also is provided with aerating apparatus.Air, under the effect of gas blower 213, pumps into membrane bioreactor by aeration plate 212, for aerobic microbiological provides oxygen, decomposes the speed of response of pollutent in sewage to improve aerobic microbiological.
Embodiment tri-:
Accompanying drawing 5 is external placed type twin-stage membrane bioreactors that a kind of anaerobic-aerobic of implementing according to technical scheme provided by the invention is combined use.
A kind of external placed type twin-stage membrane bioreactor, comprise aerobe reaction tank 301, anaerobe reaction tank 311, prime filter 302 and membrane sepn device 303, also comprises recycle pump 306, secondary filter 313 and auxiliary line.
Also be provided with prime filter 302 in aerobe reaction tank 301.Prime filter 302 is comprised of one group of filter disc assembly.The filter disc assembly is rectangle or circular sheet, comprises framework and filter screen, and filter screen is fixed on framework by welding, compression, clamping or alternate manner.Filter disc assembly both sides cover filter screen, and other direction is sealed by framework, form the cavity of airtight a, hollow.The below of every filter disc assembly all is provided with water outlet, is communicated with the water outlet 305 that is concentrated to prime filter.The filter material of this prime filter is made by an outer oriented and ordered fibrous braid or non-woven fabrics, and filtering accuracy is between 30～100 microns.
In the present embodiment, between prime filter 302 and membrane sepn device 303, also be provided with secondary filter 313, filter and stop the pollutent that enters the membrane sepn device.Secondary filter adopts PP filter core, active carbon filter core or ceramic element, and its filtering accuracy is between prime filter and membrane separation apparatus.Secondary filter is easy to dismounting, changes, and is conducive to system maintenance.
Pending sewage, after pre-treatment, is sent into anaerobe reaction tank 311, in pond by the anaerobion disaggregating treatment.Under the liquid level differential pressure action, anaerobe reaction tank 311 enters aerobe reaction tank 301 by communicating aperture 312.Sewage in the aerobe reaction tank by after the aerobic microbiological disaggregating treatment, under the pump function of water pump 306, after prime filter 302 filters, discharge aerobe reaction tank 301 from the water outlet 305 of prime filter 302, pass through again the filtration of secondary filter 313, enter the sewage inlet 307 of membrane sepn device.Clear liquid after the membrane sepn device separates is discharged from purified liquor outlet 309, and the pollutent tunicle is back to anaerobe reaction tank 311 with concentrated solution from the sewage outlet 308 of membrane sepn device after holding back and carries out sewage disposal.
External placed type twin-stage membrane bioreactor also is provided with the washing unit of described prime filter, is hydrodynamic cleaning device or gas purging device or mechanical scrub device or vibration washing device, or the combination of above-mentioned washing unit.
In the present embodiment, the washing unit 310 of prime filter is the combination of hydro-cleaning installation and mechanical scrub device, washing unit 310 can move along the screen surface direction of prime filter, every some cycles, the screen surface of described prime filter is carried out to hydrodynamic cleaning and mechanical cleaning.
Washing unit comprises slide bar 331, connecting hose 332, guide rail 333 and drive unit.Slide bar 331 is positioned at the both sides of prime filter filter screen, in the side towards filter screen, is provided with nozzle 336 and brush 337.Brush 337 is pressed close to the screen surface of prime filter.One end of connecting hose 332 communicates with shower nozzle 331, and the other end communicates with water pump, with topping-up pump, water is sprayed to screen surface, the mud punching that is deposited in screen surface can be removed.Drive unit comprises drive-motor 334, transmission belt 335 and matching component, can drive slide bar 331 to move along guide rail 333, its direction of motion is parallel with the screen surface be cleaned, thereby the band moving slide-bar moves back and forth with respect to screen surface, and brush 337 just can be scrubbed whole screen surface.
Further, if increase again an anoxic biological reaction tank between anaerobe reaction tank and aerobe reaction tank in the present embodiment, just form the anaerobic-anoxic-oxic membrane bioreactor.
Test-results shows, external placed type twin-stage membrane bioreactor provided by the invention increased the primary filter system before membrane sepn, the activated sludge floc of greater particle size and particulate matter are stopped in biological reaction tank, significantly reduced the pollution of membrane module, not only can reduce aeration and required energy and the water purification of back flushing of rinsing membrane module, avoid water pump high-speed revolution shearing power to make microorganism deactivated, and can improve membrane flux and the water production rate in use procedure, the work-ing life of membrane component and prolong, reduced the operation and maintenance cost, make the application of external membrane bioreactor more extensive.
Claims (10)
1. an external placed type twin-stage membrane bioreactor, comprise at least one biological reaction tank, prime filter and membrane sepn device, it is characterized in that:
(1) described prime filter is placed in the inside of biological reaction tank, is provided with at least one water outlet;
(2) described membrane sepn device is placed in the outside of biological reaction tank, is provided with at least one sewage inlet, a sewage outlet and a purified liquor outlet;
(3) sewage is after biological reaction tank is by the microorganism disaggregating treatment, under the effect of water pump draft, after prime filter filters, enter the membrane sepn device from the water outlet of prime filter, clear liquid after the membrane sepn device separates is discharged from purified liquor outlet, and another part concentrated solution is discharged from sewage outlet.
2. external placed type twin-stage membrane bioreactor according to claim 1, the sewage that the described sewage outlet from the membrane sepn device is discharged, be back in described biological reaction tank, or send into other waste disposal plant and processed.
3. external placed type twin-stage membrane bioreactor according to claim 1, described prime filter is one or more filter disc assemblies, it is characterized in that 1) described filter disc assembly comprises framework and filter screen, filter screen is fixed on framework, forms an airtight cavity; 2) described filter disc assembly is provided with at least one water outlet; 3) sewage is under gravity or draft effect, and the inside cavity that enters the filter disk assembly part by described strainer filtering from the outside of described filter disc assembly is flowed out by the water outlet of filter disc assembly.
4. external placed type twin-stage membrane bioreactor according to claim 3, is characterized in that, at described filter disc assembly water outlet, is provided with strainer, in the inside cavity of described filter disc assembly, is added with particulate state, Powdered or block filler.
5. external placed type twin-stage membrane bioreactor according to claim 1 is characterized in that: 1) filter material of described prime filter by wire netting, nylon wire, ceramic element, open oriented and ordered fibrous braid or non-woven fabrics outward and make; 2) filtering accuracy of described prime filter is between 10～100 microns.
6. external placed type twin-stage membrane bioreactor according to claim 1, be provided with the washing unit of described prime filter, it is characterized in that, described washing unit is the hydrodynamic cleaning device, or gas purging device, or the mechanical scrub device, or the vibration washing device.
7. external placed type twin-stage membrane bioreactor according to claim 1, be provided with movable hydro-cleaning installation, the screen surface of described prime filter is rinsed or aspirated, it is characterized in that: 1) described hydro-cleaning installation comprises shower nozzle, connecting hose, guide rail and drive unit, 2) end of connecting hose communicates with shower nozzle, and the other end communicates with water pump; 3) described shower nozzle is pressed close to the screen surface of prime filter; 4) drive unit can drive shower nozzle along guide rail movement, and its direction of motion is parallel with the screen surface be cleaned.
8. external placed type twin-stage membrane bioreactor according to claim 1, be provided with movable mechanical scrub device, screen surface to prime filter is cleaned, it is characterized in that: 1) described mechanical scrub device comprises brush, guide rail and drive unit, and described brush is pressed close to the screen surface of prime filter; 2) drive unit drives brush along guide rail movement, and its direction of motion is parallel with the screen surface of being cleaned.
9. external placed type twin-stage membrane bioreactor according to claim 1, be provided with the hydrodynamic cleaning device of described prime filter, it is characterized in that, the sewage that the described sewage outlet from the membrane sepn device is discharged, under pump function, from the shower nozzle ejection of described hydrodynamic cleaning device, the screen surface of described prime filter is rinsed.
10. external placed type twin-stage membrane bioreactor according to claim 9, described hydrodynamic cleaning device is provided with at least two grades of different irrigation flow rate, it is characterized in that the operation rule of described hydrodynamic cleaning device comprises the combination of following one or more control law:
1) irrigation flow rate of described hydrodynamic cleaning device, periodically, according to high speed, low speed switchover operation, the accounting of the time of high-speed cruising is 2～20%;
2) described hydrodynamic cleaning device is movable hydro-cleaning installation, and hydro-cleaning installation moves back and forth and rinses every some cycles, when hydro-cleaning installation moves according to high-speed cruising;
3), when the pressure reduction of described prime filter is greater than set(ting)value, the hydrodynamic cleaning device is according to high-speed cruising.
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| CN113698035A (en) * | 2021-08-23 | 2021-11-26 | 丁海建 | Membrane bioreactor for sewage treatment |
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