CN1182052C - Process and apparatus for wastewater by batched membrane-bioreactor - Google Patents
Process and apparatus for wastewater by batched membrane-bioreactor Download PDFInfo
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- CN1182052C CN1182052C CNB031003982A CN03100398A CN1182052C CN 1182052 C CN1182052 C CN 1182052C CN B031003982 A CNB031003982 A CN B031003982A CN 03100398 A CN03100398 A CN 03100398A CN 1182052 C CN1182052 C CN 1182052C
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- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
Abstract
The present invention relates to sequence batch type membrane-bioreactor sewage treatment technology and a device thereof, more specifically to equipment for treating sewage by using a sequence batch type activated sludge method and a built-in membrane-bioreactor and a method thereof. The present invention is characterized in that a membrane module is arranged in a biological reaction tank, and the outlet of the membrane module is respectively connected with a gas inlet pipe and a water outlet pipe through two groups of control valves; the overall system sequentially comprises four steps, namely flow-in, reaction, drainage and idleness according to a time period; the membrane module serves as an aerator in the step of reaction and serves as a separator in the step of drainage; the overall system comprises three alternate states on time, namely an anaerobic state, an aerobic state and an anoxic state; carbon-containing organic pollutants and nutritive elements, such as nitrogen, phosphorus, etc. can be synchronously and effectively removed. The device can effectively inhibit the development of membrane pollution, and membrane flux can be raised to five to ten times of the membrane flux of a traditional built-in membrane-bioreactor under the same operating condition. Besides, the entire device has simple structure, omits dedicated aerating, stirring and draining equipment and easily achieves automatic control and operation management.
Description
Technical field
The present invention relates to a kind of water and wastewater processing technology, relate in particular to a kind of method and apparatus that utilizes sequencing batch active sludge and film-bioreactor that sewage is handled, belong to water and wastewater treatment and purification techniques field.
Background technology
Known bio-denitrifying sewage dephosphorization process, for example forward type denitrification biological denitrogenation system (being A-O technology), anaerobic-aerobic dephosphorization process (also claiming A-O technology) etc. generally can not effectively be removed simultaneously to nitrogen and two kinds of elements of phosphorus.Though it (is A-A-O or A that people have also developed pressure oxygen-anoxic-aerobic method
2-O technology) synchronous denitrification dephosphorization technique such as, but it is the same with aforementioned two kinds of A-O technologies, system comprises a plurality of processing structures such as anaerobic pond (or anoxic pond), Aerobic Pond, settling tank, the technical process complexity, floor space is big, operational management inconvenience, effluent quality still can not reach good level simultaneously, and regeneration is subjected to a lot of limitations.
Sequencing batch active sludge (is an intermittent activated sludge process, Sequencing Batch Reactor, SBR) be a mutation of traditional continous way activated sludge process, its principal reaction device has only an aeration tank, finish functions such as aeration and sedimentation simultaneously, its operation can be divided into following five operations: 1. flow into; 2. reaction; 3. precipitate; 4. discharging; 5. standby (leaving unused).As shown in Figure 1.Compare with traditional continous way activated sludge process, the SBR system forms simple relatively, need not the mud refluxing unit, does not establish secondary sedimentation basins, and the aeration tank volume is also less than continous way, and the construction cost of entire treatment system and working cost all descend to some extent.In addition, the active sludge among the SBR has good settleability, does not generally produce the sludge bulking phenomenon, and the adjusting by operation scheme, removes when can finish carbonaceous organic material and nitrogen, phosphorus nutrition element in single processing structures.
But SBR is the same with traditional continous way activated sludge process, still adopt gravity to carry out mud-water separation, after the precipitation phase finishes, active sludge is sunken to the bottom, aeration tank, drain from the surface by the supernatant liquor of straining after hydrophone (a kind of can with the drainage machinery of liquid level automatic lifting) will be handled, obtain the system handles water outlet thus.Therefore, SBR still has the following disadvantages.
(1) still contains suspended matter in the treat effluent, hygiology such as bacterium and virus index and other water-quality guideline all with reuse water (or reuse water, middle water) water quality has a certain distance, desire adapts to the demand of reuse of wastewater, must increase follow-up advanced treatment unit, system flow prolongs, and construction and working cost will improve thereupon.
(2) system need be provided with special aerator, whipping device and water-freeing arrangement, not only increases initial construction investment, and has increased the management maintenance difficulty in the day-to-day operation.
(3) cycle of operation longer, the aeration tank volume is still bigger than normal, system takes up an area of compact inadequately, uses in the area of land resources anxiety to be restricted.
For adapting to the requirement of reuse of wastewater, in recent years, people have developed film-bioreactor (Membrane Bioreactor, MBR) technology, this technology organically combines membrane separation technique and traditional wastewater biologic treating technique, by the high efficiency separation effect realization mud-water separation of membrane module, thereby obtained very good effluent quality, detect less than suspended matter in the water outlet, bacterium and virus are also significantly removed, and every water-quality guideline all is better than the reuse water requirements in water quality.Simultaneously because the appearance of special efficacy bacterium (particularly dominant microflora) in the increase of activated sludge concentration and the mud in the aeration tank, biochemical reaction rate improves greatly in the system, and hydraulic detention time can shorten, and the volume of aeration tank decreases.Compare with the traditional water treatment process that comprises SBR, MBR has outstanding advantages such as effluent quality good stable, floor space is little, excess sludge production is few, operational management is convenient, but MBR still has the following disadvantages and defective.
(1) membrane flux is less.Use more hollow fiber film assembly at present in built-in film-bioreactor, under the active sludge intermixture condition, the membrane flux of its steady running is generally at 10L/ (m
2Hr) about, surpass 20L/ (m
2Hr) after, the tempo that film pollutes will be very rapid, can cause the quick decline of system's water-yielding capacity, even can not get filtering water outlet.Because the restriction of membrane flux, built-in film-bioreactor needs a large amount of mould materials, no matter be hollow-fibre membrane, the flat sheet membrane of making by macromolecular material, it still is the tubular film of making by inorganic ceramic material, its price is all higher, and this makes the construction investment of film-bioreactor apparently higher than traditional technology.
(2) the film pollution is restive, lacks the reliable method of keeping operation steady in a long-term, and the work-ing life of mould material is shorter.Under the active sludge intermixture condition,,,,, promptly produced the film pollution with increasing the filtration resistance of film at its hole and surperficial formed fenestra obstruction, gel coat and cake layer etc. along with the prolongation of working time as the film of macromolecular substance filtration barrier.Film pollutes membrane flux will be descended significantly.Still do not have at present the reliable method that effective controlling diaphragm pollutes, this makes the long-term stability operation of film-bioreactor be subjected to very big influence.Develop into to a certain degree when film pollutes, must carry out the chemical agent cleaning of online or off-line to film, with the recovery membrane flux, but through after repeatedly chemical agent cleans, will reduce greatly the actual service life of film.The renewal of film has then increased depreciable cost.
(3) operation energy consumption is higher.At present, for delaying the generation that film pollutes, general all is the means of taking ydrodynamics, high-intensity aeration rate is provided below film, causes the violent turbulent fluctuation of face, simultaneously membrane flux is controlled at lower level, though so suitably delayed the film pollution, but make that the operation energy consumption of built-in film-bioreactor is still higher, its gas-water ratio is generally more than 4 times of traditional activated sludge process, promptly above 40: 1.
(4) system's denitrogenation dephosphorizing poor effect.Existing film-bioreactor generally is aerobic environment, therefore can not effectively remove nutritive elements such as nitrogen, phosphorus.
Though the patent documentation that existing both at home and abroad several application sequencing batch active sludges and film-bioreactor carry out sewage disposal, as " intermittent activated sludge process wastewater treatment equipment (patent No. 92218412.7) ", " intermittent activated sludge process sewage purifier (patent No. 94238698.1) ", " aspirate built-in film-bioreactor (patent No. 97228698.5) ", " water technology of flow through type membrane biological reactor and equipment thereof (patent No. 99111514.7) ", but these patents all fail to solve the effluent quality that how to improve sequencing batch active sludge, effectively suppress the development that film pollutes in the film-bioreactor and improve membrane flux, reduce key issues such as operation energy consumption.
Summary of the invention
The objective of the invention is deficiency and defective at sequencing batch active sludge and film-bioreactor existence, a kind of batched membrane-bioreactor effluent treatment process and device are provided, when can being implemented in the single processing unit nutritive elements such as carbonaceous organic material and nitrogen, phosphorus, this technology and device effectively remove, system can obtain good effluent quality, and apparatus structure is simple, providing under the situation of lower aeration rate, the development of controlling diaphragm pollution can obtain higher membrane flux simultaneously effectively.
Technical scheme of the present invention is as follows:
A kind of sequence batch (membrane-bioreactor sewage water treatment unit, this device mainly comprises open rectangular parallelepiped or drum type brake reaction tank, be placed on membrane module and guiding device in the reaction tank, intake pump, rising pipe, gas blower, inlet pipe, Controlling System is characterized in that: described guiding device is divided into two zones with reaction tank inside, and the outlet of described membrane module is connected with rising pipe with inlet pipe respectively by two groups of by-pass valve controls; Be provided with water distributor below reaction tank internal membrane assembly, this water distributor is connected with intake pump by vacuum breaker; In described reaction tank bottom shore pipe and mud valve are installed.
Membrane module described in the present invention adopts porous sintered pipes, tubular ceramic film or metal porous pipe; Distance between its lower edge and the reaction tank bottom is greater than 1/3rd of reaction tank available depth.
Guiding device described in the present invention can adopt board-like or cylinder mode, and corresponding, described water distributor then adopts tubular type or ring type.
Another technical characterictic of the present invention is to adopt the use in parallel of a plurality of same reaction unit, thereby makes total system realize water inlet and continuous effluent continuously.
The present invention also provides a kind of batched membrane-bioreactor effluent treatment process that utilizes said apparatus, and its step comprises:
(1) flow into: former water is sprayed in the inflow reactor via water distributor by the intake pump supercharging, stops during to the scheduled time or liquid level;
(2) reaction: under the adjusting of Controlling System, the by-pass valve control that the membrane module exit is connected with inlet pipe is opened, the by-pass valve control that is connected with rising pipe is closed, this moment, membrane module served as aerator, the pressurized air that is provided by gas blower sees through membrane module internally, form oxygen supply in active sludge intermixture with microbubble, microorganism in the active sludge is by the metabolism of self, with the organic pollutant biodegrade in the waste water, make it be decomposed into small-molecule substance even permineralization, stop during to the scheduled time;
(3) discharging: under the adjusting of Controlling System, the by-pass valve control that the membrane module exit is connected with inlet pipe is closed, the by-pass valve control that is connected with rising pipe is opened, this moment, membrane module served as separator, under the effect of the negative pressure-pumping of suction pump or liquid level difference, water and part small-molecule substance see through membrane module, become system's water outlet through rising pipe, and macromolecular substance, active sludge microorganism and inorganic particle all are trapped in the reaction tank by membrane module.Stop during to the scheduled time or liquid level;
(4) idle: under the adjusting of Controlling System, the membrane module exit is all closed with two by-pass valve controls that inlet pipe is connected with rising pipe, and the reaction tank also not water outlet of neither intaking is in holding state;
(5) system repeats (1), (2), (3), (4) each step in turn with certain cycle of operation in later time, and total system alternately experiences anaerobism, aerobic, anoxybiotic state, intermittent water inflow and water outlet, and regularly discharge remaining active sludge.
Membrane flux can be controlled in 50～150L/ (m in this technology
2Hr).
Batched membrane-bioreactor effluent treatment process that the present invention proposes, its principle is:
(1) biological denitrificaion: because the high efficiency separation effect of film, generally difficult nitrifier that retains can be trapped in the reactor fully in the traditional wastewater biological treatment system, and can keep higher concentration.In reaction process, nitrifier is oxidized to nitrite nitrogen and nitrate nitrogen with ammonia nitrogen.After through discharging and idle operation, dissolved oxygen in the reactor reduces gradually, finally becomes anoxic even anaerobic environment, when flowing into operation, organic pollutant in the former water provides carbon source for denitrifying bacteria, and denitrifying bacteria further is reduced to gaseous nitrogen (N with nitrite nitrogen and nitrate nitrogen
2), thereby realized removal to total nitrogen (TN).
(2) biological phosphate-eliminating: in reaction process, be aerobic environment in the reaction tank, dephosphorization bacterial utilizes the BOD in the waste water
5Or the energy that oxygenolysis discharged of the poly-beta-hydroxy-butanoic acid of storing in the body absorbs the phosphorus in the waste water, and a part of phosphorus is used to synthetic ATP, and Jue Dabufen phosphorus then is synthesized to poly-phosphate and is stored in the cell paste in addition.Flowing into in-process, in the reaction tank is anaerobic environment, dephosphorization bacterial can decompose intravital poly-phosphate and produce ATP, and utilize ATP that the organism in the waste water is taken in the cell, form with organic granulars such as poly-beta-hydroxy-butanoic acids is stored in the cell, also will decompose the phosphoric acid that poly-phosphate produces simultaneously and excrete.Because the phosphorus that absorbed under aerobic condition of dephosphorization bacterial is many than the phosphorus that is under anaerobic discharged, so a large amount of phosphorus is stored in the cell paste with the form of poly-phosphate, system has realized the removal to total phosphorus (TP) by regularly discharging excess sludge.
(3) suppressing film pollutes: for membrane module, serve as separator in the discharging operation, prolongation along with filtration time, small-molecule substance will stop up fenestra, the film surface also can form respectively gel coat and the cake layer by colloid and granulometric composition gradually, especially the formation of cake layer will increase the filtration resistance of film rapidly, and membrane flux will have significant decline.After the reaction process of the next cycle of operation begins, membrane module begins to serve as aerator, the pressurized air that is under described pressure and the described flow status will be through the hole of film (at the aeration initial stage, pressurized air will mix with the water that remains in membrane module inside, see through the hole of film with the form of dissolved air water), can effectively remove the cake layer on film surface, simultaneously fenestra obstruction and face gel coat also be had certain removal effect.Under the recoil effect of air, the filtration resistance of film is significantly reduced, and membrane flux is restored.Membrane module with the described time cycle in turn with aerator and strainer alternation, therefore the development of film pollution can be effectively suppressed, membrane module can long-term stability move under the state of high membrane flux, and the needed aeration rate of system also can be controlled at very low level.
The present invention compared with prior art has the following advantages and the high-lighting effect:
Effectively remove when (1) having realized nutritive elements such as carbonaceous organic material and nitrogen, phosphorus in single processing unit, system has good effluent quality, and treating water can be back to extensively that life is used mixedly or field such as industrial production.Because adopt membrane module to carry out mud-water separation, suspended matter, active sludge microorganism and macromolecular substance are all efficiently held back by membrane module, detect less than SS COD in the water outlet
Cr＜50mg/L, BOD
5＜10mg/L, turbidity＜1NTU.And owing to created anaerobism, anoxic, aerobic alternative environment in time, institute thinks that nitrifier and denitrifying bacteria and dephosphorization bacterial carry out denitrogenation and dephosphorization provides suitable process conditions, TN＜10mg/L in the water outlet, TP＜1.0mg/L.
(2) whole apparatus structure is simple, is easy to control and running maintenance automatically.Because membrane module not only serves as aerator but also serve as aerator, therefore in sequencing batch active sludge or built-in film-bioreactor, must all can save by the special aerator (as micro porous aeration head, perforated pipe etc.) that is provided with, also need not whipping device and water-freeing arrangement in the sequencing batch active sludge, and can and discharge two operations and merge into an operation precipitation, system's cycle of operation can further shorten, take up an area of then and more save, control and operational management are also more convenient automatically.
(3) control and utilized the film pollution effectively.It is exactly that film pollutes that embrane method is applied to one of problem of most critical in the water treatment.In the sequence batch (film-bioreactor, not only the air recoil by has intermittently suppressed the generation that film pollutes effectively, and utilize film pollute in irreversible part improved the filtering accuracy of wide aperture poromerics as self-forming dynamic membrane.
(4) increased substantially membrane flux.The face cake layer has been removed in air recoil intermittently effectively, the filtration resistance of film is controlled at lower level, thereby make system obtain higher membrane flux, can reach 5 times to 10 times of traditional built-in film-bioreactor under the identical operational conditions usually, i.e. 50～150L/ (m
2Hr).
(5) significantly reduced aeration rate.In the sequence batch (film-bioreactor, the face cake layer is directly removed in air recoil intermittently, suppressed the generation that film pollutes effectively, therefore needn't be as traditional built-in film-bioreactor, substantially exceed the violent turbulent fluctuation that the required aeration rate of microbial metabolism causes face to provide, make colloid or particle under the effect of shearing force not to the film surface deposition, and only provide less aeration rate (even suitable) with traditional activated sludge process, both can satisfy the metabolism requirement of microorganism, and make the interior mud mixed liquid of reactor to circulate again.
Description of drawings
Fig. 1 is the operation synoptic diagram of the sequencing batch active sludge operation of available technology adopting.
Fig. 2 is the structure of sequence batch (membrane-bioreactor sewage water treatment unit provided by the invention and flows into the operation synoptic diagram.
Fig. 3 is the structure and the reaction process synoptic diagram of sequence batch (membrane-bioreactor sewage water treatment unit provided by the invention.
Fig. 4 is the structure and the discharging operation synoptic diagram of sequence batch (membrane-bioreactor sewage water treatment unit provided by the invention.
Fig. 5 is the structure and the idle operation synoptic diagram of sequence batch (membrane-bioreactor sewage water treatment unit provided by the invention.
Fig. 6 is the A-A sectional view that Fig. 2-5 adopts rectangular parallelepiped reaction tank, board-like guiding device and tubular type water distributor.
Fig. 7 is the A-A sectional view that Fig. 2-5 adopts drum type brake reaction tank, drum type brake guiding device and ring type water distributor.
Fig. 8 adopts the structural representation that is arranged in parallel of 4 reactor units for the present invention.
Embodiment
Explain detailedly below in conjunction with drawings and Examples, understand the present invention with further.
Sequence batch (membrane-bioreactor sewage water treatment unit provided by the present invention mainly comprises reaction tank 1, is placed on membrane module 2 and guiding device 3 in the reaction tank, intake pump 6, rising pipe 9, gas blower 7, inlet pipe 8, Controlling System 12.Described reaction tank 1 is open rectangular parallelepiped or cylinder mode, described guiding device is divided into two zones of M1, M2 with reaction tank inside, described membrane module is placed in the M1 district, described membrane module adopts porous sintered pipes, tubular ceramic film or metal porous pipe, distance between its lower edge and the reaction tank bottom should be greater than 1/3rd of reaction tank available depth, and its outlet links to each other with rising pipe with inlet pipe respectively by two by-pass valve control V1, V2.Be provided with water distributor 4 below reaction tank internal membrane assembly, this water distributor is connected with intake pump 6 by vacuum breaker 5.In described reaction tank bottom shore pipe 10 and mud valve 11 are installed.Described guiding device can adopt board-like or cylinder mode, and corresponding, described water distributor then adopts tubular type or ring type.Rising pipe can be arranged on the top of membrane module, and must obtain water outlet this moment by going out the water pump suction; Rising pipe also can be arranged on the membrane module below, and driven by head difference and can obtain water outlet this moment.A plurality of (overall number is 4 multiple) same reaction unit can in parallelly use, and makes total system realize water inlet and continuous effluent continuously.
Fig. 2, Fig. 3, Fig. 4 and Fig. 5 represent that respectively inflow, reaction, the discharging, idle four of sequence batch (membrane-bioreactor sewage water treatment unit in each cycle of operation goes on foot the working order of operations.
As shown in Figure 2, flowing into operation, former water is by the intake pump supercharging, spray the inflow reaction tank through water distributor, the active sludge that is deposited in the reaction tank bottom is seethed with excitement, fully contact with former water, this moment, active sludge intermixture was in anaerobic state, organic pollutant in the former water provides carbon source for denitrifying bacteria, and denitrifying bacteria further will be gone up the nitrite nitrogen and the nitrate nitrogen that form in the cycle of operation and be reduced to gaseous nitrogen (N
2), realize removal to total nitrogen (TN).Dephosphorization bacterial then decomposes intravital poly-phosphate and produces ATP, and utilize ATP that the organism in the waste water is taken in the cell, form with organic granulars such as poly-beta-hydroxy-butanoic acids is stored in the cell, also will decompose the phosphoric acid that poly-phosphate produces simultaneously and excrete, thereby be that the phosphorus in the excess ingestion waste water is ready in reaction process.When flowing into the operation end, liquid level in the reaction tank reaches standard state, as shown in Figure 3, and the beginning reaction process, under the adjusting of Controlling System, by-pass valve control V1 opens, and V2 closes, at this moment, membrane module serves as aerator, the pressurized air that is provided by gas blower sees through membrane module via inlet pipe, and with form efficient oxygen supply in active sludge intermixture of microbubble, gas-water ratio can be controlled in 10～40: 1.The rising liquid stream that aeration caused makes mixed solution form the up-flow district respectively in the both sides of guiding device and falls stream district, and flows at the reaction tank internal recycle, thereby guarantees fully contacting of active sludge and sewage; Simultaneously, microorganism tunicles such as the bacterium in the active sludge efficiently are trapped in the reaction tank, and sludge concentration can maintain 4～12g/L, and under the condition of low sludge loading, biochemical reaction rate is very high, can effectively degrade to the carbon containing organic pollutant in the sewage.Simultaneously, nitrifier is oxidized to nitrite nitrogen and nitrate nitrogen with ammonia nitrogen, and dephosphorization bacterial then utilizes the BOD in the waste water
5Or the energy that oxygenolysis discharged of the poly-beta-hydroxy-butanoic acid of storing in the body absorbs the phosphorus in the waste water, and a part of phosphorus is used to synthetic ATP, and Jue Dabufen phosphorus then is synthesized to poly-phosphate and is stored in the cell paste in addition.In reaction process latter stage, can be by shore pipe and mud valve discharge section active sludge, thus the realization system is to the final removal of total phosphorus (TP).
When reaction process finished, as shown in Figure 4, the discharging operation began, under the adjusting of Controlling System, by-pass valve control V1 closes, and V2 opens, at this moment, membrane module serves as separator, residual air will be discharged from outlet pipeline rapidly in the membrane module, and under the effect of the negative pressure-pumping of suction pump or head difference, water and part small-molecule substance see through membrane module, become system's water outlet through outlet pipeline, macromolecular substance, active sludge microorganism and inorganic particle are membrane module and are trapped in the reactor.Membrane flux can be controlled in 50～150L/ (m
2Hr).
Total system repeats inflow, reaction, discharging, idle four operations by Controlling System in turn with certain cycle of operation, membrane module serves as aerator in reaction process, in the discharging operation, serve as separator, total system is in anaerobism, aerobic, anoxic alternative state all the time, intermittent water inflow and water outlet, and reaction process latter stage via the regular remaining active sludge of discharging of shore pipe and mud valve.
Embodiment
As shown in Figure 2, in 1.5 hours of inflow operation, former water is by the intake pump supercharging, spray the inflow reaction tank through water distributor, the active sludge that is deposited in the reaction tank bottom is seethed with excitement, fully contact with former water, this moment, active sludge intermixture was in anaerobic state, organic pollutant in the former water provides carbon source for denitrifying bacteria, and denitrifying bacteria further will be gone up the nitrite nitrogen and the nitrate nitrogen that form in the cycle of operation and be reduced to gaseous nitrogen (N
2), realize removal to total nitrogen (TN).Dephosphorization bacterial then decomposes intravital poly-phosphate and produces ATP, and utilize ATP that the organism in the waste water is taken in the cell, form with organic granulars such as poly-beta-hydroxy-butanoic acids is stored in the cell, also will decompose the phosphoric acid that poly-phosphate produces simultaneously and excrete, thereby be that the phosphorus in the excess ingestion waste water is ready in reaction process.
After flowing into the operation end, as shown in Figure 3, reaction process begins, under the adjusting of Controlling System 12, magnetic valve V1 opens, V2 closes, at this moment, membrane module serves as aerator, and providing pressure by gas blower is the pressurized air of 0.3MPa, by membrane module aeration in reaction tank, gas-water ratio is controlled to be made as 30: 1, and in the M1 district, mixed solution forms upwelling from the bottom to top, then form katabatic drainage from top to bottom in the M2 district, all mixed solutions then circulate between two district M1 in reaction tank and M2 as shown by arrows.Microorganism tunicles such as the bacterium in the active sludge efficiently are trapped in the reaction tank, and sludge concentration can maintain 8g/L, and under the condition of low sludge loading, biochemical reaction rate is very high, can effectively degrade to the carbon containing organic pollutant in the sewage.Simultaneously, nitrifier is oxidized to nitrite nitrogen and nitrate nitrogen with the ammonia nitrogen in the waste water, and dephosphorization bacterial then utilizes the BOD in the waste water
5Or absorb phosphorus in the waste water flowing into the energy that oxygenolysis discharged that in-process is stored in intravital poly-beta-hydroxy-butanoic acid, part phosphorus is used to synthetic ATP, Jue Dabufen phosphorus then is synthesized to poly-phosphate and is stored in the cell paste in addition, because the phosphorus that dephosphorization bacterial is absorbed under aerobic condition is more than the phosphorus that is under anaerobic discharged, therefore a large amount of phosphorus is stored in the cell paste with the form of poly-phosphate.In reaction process latter stage, can be by shore pipe and mud valve discharge section active sludge, thus the realization system is to the final removal of total phosphorus (TP).
After the reaction process that lasts 2 hours finishes, as shown in Figure 4, the discharging operation begins, under the adjusting of Controlling System, magnetic valve V1 closes, V2 opens, at this moment, membrane module serves as separator, residual air will be discharged from rising pipe rapidly in the membrane module, and under the effect of the negative pressure-pumping of suction pump or head difference, water and part small-molecule substance see through membrane module, become system's water outlet through rising pipe, macromolecular substance, active sludge microorganism and inorganic particle are membrane module and are trapped in the reaction tank.Membrane flux can be controlled in 80L/ (m
2Hr), operation is controlled is made as 1 hour in discharging.
As shown in Figure 5, after drainage procedure finished, under the adjusting of Controlling System, magnetic valve V1, V2 all closed, the idle operation that system enters 0.5 hour by a definite date.In idle operation, active sludge microorganism is in anoxic condition.
System in later time under the adjusting of Controlling System with cycle of operation of 5 hours repeat in turn to flow into, reaction, discharging, idle four operations; System also can will react, discharge two step operations and carry out repeatedly alternately repeating in a cycle of operation.Membrane module serves as aerator in reaction process, serve as separator in the discharging operation, and total system alternately experiences anaerobism, aerobic, anoxybiotic state, intermittent water inflow and water outlet, and regularly discharge remaining active sludge.
When former water was general sanitary sewage, its main water-quality guideline was: COD
Cr=400～500mg/L, BOD
5=200～300mg/L, SS=100～300mg/L, TN=20～80mg/L, TP=4～15mg/L, through after batched membrane-bioreactor for treatment, the main water-quality guideline of water outlet can reach: COD
Cr=20～30mg/L, BOD
5=5～10mg/L, SS=0mg/L, TN=5～10mg/L, TP＜1.0mg/L removes efficient and is respectively: COD
Cr〉=94%, BOD
5〉=96%, SS=100%, TN 〉=75%.
Claims (9)
1. sequence batch (membrane-bioreactor sewage water treatment unit, this device mainly comprises open rectangular parallelepiped or drum type brake reaction tank, be placed on membrane module and guiding device in the reaction tank, intake pump, rising pipe, gas blower, inlet pipe, Controlling System is characterized in that: described guiding device is divided into two zones with reaction tank inside, and the outlet of described membrane module is connected with rising pipe with inlet pipe respectively by two groups of by-pass valve controls; Be provided with water distributor below reaction tank internal membrane assembly, this water distributor is connected with intake pump by vacuum breaker; In described reaction tank bottom shore pipe and mud valve are installed.
2. according to the described sequence batch (membrane-bioreactor sewage water of claim 1 treatment unit, it is characterized in that: described membrane module adopts porous sintered pipes, tubular ceramic film or metal porous pipe.
3. according to the described sequence batch (membrane-bioreactor sewage water of claim 1 treatment unit, it is characterized in that: the distance between described membrane module lower edge and the reaction tank bottom, greater than 1/3rd of reaction tank available depth.
4. according to the described sequence batch (membrane-bioreactor sewage water of claim 1 treatment unit, it is characterized in that: described guiding device adopts board-like or cylinder mode.
5. according to the described sequence batch (membrane-bioreactor sewage water of claim 4 treatment unit, it is characterized in that: described water distributor adopts tubular type or ring type.
6. according to the described sequence batch (membrane-bioreactor sewage water of each claim of claim 1-5 treatment unit, it is characterized in that: this device can adopt the use in parallel of a plurality of same reaction unit.
7. batched membrane-the bioreactor effluent treatment process that employing is installed according to claim 1 is characterized in that this technology comprises the steps:
(1) flow into: former water is sprayed in the inflow reactor via water distributor by the intake pump supercharging, stops during to the scheduled time or liquid level;
(2) reaction: under the adjusting of Controlling System, the by-pass valve control that the membrane module exit is connected with inlet pipe is opened, the by-pass valve control that is connected with rising pipe is closed, this moment, membrane module served as aerator, the pressurized air that is provided by gas blower sees through membrane module internally, form oxygen supply in active sludge intermixture with microbubble, microorganism in the active sludge is by the metabolism of self, with the organic pollutant biodegrade in the waste water, make it be decomposed into small-molecule substance even permineralization, stop during to the scheduled time;
(3) discharging: under the adjusting of Controlling System, the by-pass valve control that the membrane module exit is connected with inlet pipe is closed, the by-pass valve control that is connected with rising pipe is opened, this moment, membrane module served as separator, under the effect of the negative pressure-pumping of suction pump or liquid level difference, water and part small-molecule substance see through membrane module, become system's water outlet through rising pipe, macromolecular substance, active sludge microorganism and inorganic particle all are trapped in the reaction tank by membrane module, stop during to the scheduled time or liquid level;
(4) idle: under the adjusting of Controlling System, the membrane module exit is all closed with two by-pass valve controls that inlet pipe is connected with rising pipe, and the reaction tank also not water outlet of neither intaking is in holding state;
(5) with each step of repeating step 1, step 2, step 3, step 4 in turn certain cycle of operation, total system alternately experiences anaerobism, aerobic, anoxybiotic state in later time in system, intermittent water inflow and water outlet, and regularly discharge remaining active sludge.
8. according to the described batched membrane-bioreactor effluent treatment process of claim 7, it is characterized in that: the cycle of operation in the step 5 can carry out step 2, step 3 repeatedly alternately repeating.
9. according to the described batched membrane-bioreactor effluent treatment process of claim 7, it is characterized in that: membrane flux can be controlled in 50～150L/m in this technology
2Hr.
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Cited By (1)
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| CN100406398C (en) * | 2006-08-29 | 2008-07-30 | 华南理工大学 | Sequential air lifting circulation waste water biological treatment reactor and its process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100406398C (en) * | 2006-08-29 | 2008-07-30 | 华南理工大学 | Sequential air lifting circulation waste water biological treatment reactor and its process |
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