CN104843954A - Sewage treatment device and treatment method thereof for large-scale sewage treatment station - Google Patents
Sewage treatment device and treatment method thereof for large-scale sewage treatment station Download PDFInfo
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- CN104843954A CN104843954A CN201510313409.3A CN201510313409A CN104843954A CN 104843954 A CN104843954 A CN 104843954A CN 201510313409 A CN201510313409 A CN 201510313409A CN 104843954 A CN104843954 A CN 104843954A
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Abstract
The invention discloses a sewage treatment device for a large-scale sewage treatment station. The sewage treatment device comprises a filtering device, a regulating hydrolysis tank, a grade-A biochemical tank, a grade-O biochemical tank, a precipitation tank, an improved coagulation system, a disinfection tank, a sludge thickening tank, oxygenation equipment and a gas stripping device, wherein the filtering device, the regulating hydrolysis tank, the grade-A biochemical tank, the grade-O biochemical tank, the precipitation tank, the improved coagulation system and the disinfection tank are connected with one another in sequence from front to back; the gas stripping device is a pulse gas stripping device which is used for stripping one part of sludge precipitated in the precipitation tank into the sludge thickening tank, and the other part of the sludge precipitated in the precipitation tank into the grade-A biochemical tank; the grade-O biochemical tank is provided with the oxygenation equipment which is a centrifugal blower. The invention also provides a sewage treatment method for the large-scale sewage treatment station. The sewage treatment device disclosed by the invention has the advantages of being full in filtration and high in treatment efficiency of precipitated sludge, saving the floor area, and having an integrated function of regulation and decomposition.
Description
Technical field
The present invention relates to technical field of sewage, particularly relate to a kind of waste disposal plant and treatment process thereof of down-stream treatment station.
Background technology
Sewage water treatment method under prior art mainly contains following several:
1, dirty facility is blocked
In the former water of this engineering, solid impurity content is higher, for guaranteeing that the equipment such as lift pump normally work and ensure that subsequent disposal structures normally run, intends arranging at the leading portion of process main process blocking dirty facility.
2, carry out a biological disposal upon
Common sewage works generally adopts following several bioremediation.
A) biological contact oxidation process
Biological contact oxidation process belongs to biomembrance process, has the following advantages and feature:
1) in biological contact oxidation process biological tank, filler is set, because the specific surface area of filler is large, in pond, aerobic condition is good, and in biological contact oxidation pond, the biomass of unit volume is all higher than activated sludge process aeration tank and biological filter, and therefore biological contact oxidation pond has higher volumetric loading;
2) because quite a few microorganism set growth is at filling surface, biological contact oxidation process can not establish sludge recirculation system, also there is not sludge bulking problem, and operational management is convenient;
3) because biosolids amount in biological contact oxidation pond is many, current belong to complete mixed type, and therefore the cataclysm of biological contact oxidation pond to water quality and quantity has stronger adaptive faculty;
4) because biosolids amount in biological contact oxidation pond is many, when organism volumetric loading is higher, its F/M (F is organic radical quality, and M is microbial biomass) is than remaining on certain level, and therefore sludge yield can be equivalent to or lower than activated sludge process;
5) because loading filler, biological contact oxidation pond unit manufacturing cost is slightly high, is generally applicable to middle-size and small-size (Qd≤2500m3/d) sewage works.
B) conventional activated sludge method
Activated sludge process is a kind of most widely used waste water aerobic biologic treating technique in big-and-middle-sized sewage disposal.The primary condition that active sludge processing system effectively runs and feature are:
1) should have the easy degradation material of enough solubilities in waste water, as the nutrition that microbial physiology is movable required, general activated sludge process regularly must add nutritive substance according to a certain ratio, which increases working cost and management difficulty;
2) mixed solution must containing enough dissolved oxygens, and active sludge concentration basin is long aerobic protozoon, and the demand of oxygen is larger;
3) active sludge is suspended state pond planted agent, can fully contact with water and mix;
4) active sludge continuous backflow, gets rid of excess sludge in time, makes the activated sludge concentration that mixed solution keeps certain;
5) the Activated Sludge Growth cycle is long, poor to the cataclysm adaptive faculty of temperature, water quality and the water yield;
6) within should safe level being strict controlled in the virulent material of microorganism;
7) Wastewater Treated by Activated Sludge Process meets lower, and cause the volume of facility to increase, construction investment is corresponding increase also.
Just because of have above prerequisite and feature, so activated sludge process operational management is more professional.Activated sludge process easily produces sludge bulking in addition, and processing load is lower, wayward management, therefore use in recent years in middle-size and small-size sewage works is fewer and feweri.
C) SBR method
SBR method is a kind of comparatively advanced activated sludge method that developed recently gets up, and this treatment process integrates aeration tank, settling tank, continuum micromeehanics, intermittent aeration, settlement of sewage when stopping the supple of gas or steam, and skim supernatant liquor, becomes one-period, goes round and begins again.SBR method does not establish settling tank, and without sludge reflux equipment, but SBR method is gap operation, need establish multiple processing unit, and water inlet and aeration switch mutually, cause control comparatively complicated.In order to ensure weir loading, SBR method requires high to water decanter device fabrication, must keep on improving, otherwise very easily cause final outflow water water quality not up to standard during making.Domestic also do not have quality to strain wetting system preferably at present, import equipment buying trouble, and expensive, and maintenance cost is also high from now on simultaneously.In SBR method pond, sludge concentration is measured by concentration meter to control to discharge unnecessary sludge quantity, and current domestic concentration meter quality does not pass a test, and causes mud discharging to control more difficult.
SBR pond weir loading low (being generally no more than 40%), facility volume is comparatively large, causes construction investment higher.Owing to there are the technical matters that superelevation must be higher, active sludge concentration basin and SBR pond generally can only outdoor layouts, such local influence environment aesthetic feeling while arranging (buried construction investment will greatly increase).Contact oxidation technology each pond body can adopt buried setting, and equipment can arrange road or green belt, and general arrangement is elegant in appearance.But traditional biological contact oxidation process has the following disadvantages:
1) owing to there is a large amount of non-dissolved organic matters in sanitary sewage and being difficult to biological degradation macromolecular substance, before carrying out biochemical treatment, the acidifying biological treatment that is hydrolyzed is needed.Non-dissolved organic matter in sewage is retained and progressively changes dissolved organic matter into, some be difficult to biological degradation macromolecular substance be converted into be easy to degrade small-molecule substance as organic acid.Therefore, large-scale sewage works is all provided with special hydrolytic tank.The setting of hydrolytic tank, occupies the large quantity space for the treatment of station on the one hand; Consume man power and material on the other hand.
2) solid refuse after grating tank is filtered is easy to bring into transport unit inside, blocks transport unit, causes transport unit cisco unity malfunction; Meanwhile, also filtration efficiency can be affected;
3) pool wall of vertical sedimentation basin is constructed by Steel Concrete, and surface is in roughness, and space between the lower end of traditional spoil disposal pipeline and pool wall is larger, floats on liquid level, cause secondary pollution after causing being deposited in the sludge disintegration on pool wall;
4) mud after precipitation burns after dewatering often through unslaked lime, there is the large and weak point of contaminate environment of processing cost.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind ofly to filter fully, precipitating sludge processing efficiency is high, save floor occupying area, good purification, the waste disposal plant with the down-stream treatment station regulating hydrolysis integrated function and treatment process thereof.
The present invention solves the problems of the technologies described above by the following technical solutions: a kind of waste disposal plant of down-stream treatment station, comprises filtration unit, regulates hydrolytic tank, A level biochemistry pool, O level biochemistry pool, settling tank, sterilization pool, sludge thickener, oxygen replenishing equipment and air-lift device.Described filtration unit, described adjustment hydrolytic tank, described A level biochemistry pool, described O level biochemistry pool, described settling tank and described sterilization pool are connected from front to back successively.Sanitary sewage tentatively filters by described filtration unit, and described filtration unit comprises grating tank, grid, transport unit, handgrip, seal strip and garbage cleaning device.Described grid is fixed in described grating tank, and the initiating terminal of described transport unit is arranged on the water outlet of described grating tank, and the end of described transport unit is connected with described garbage cleaning device.The delivery direction that described handgrip is parallel to described transport unit is successively set on described transport unit.Described seal strip covers on the gap between described transport unit and described grating tank pool wall.Be hung with microbial film in described adjustment hydrolytic tank, described microbial film comprises filter material layer, anaerobic layer, aerobic layer and hydrophilic layer from the inside to the outside successively.Described air-lift device is pulse air lifting device, and a part of mud precipitated in described settling tank is carried in described sludge thickener by described pulse air lifting device, and is carried by another part mud precipitated in described settling tank in described A level biochemistry pool.Described O level biochemistry pool is configured with described oxygen replenishing equipment, and described oxygen replenishing equipment is centrifugal blower.
Preferably, the setting angle of described grid is (50-80) °, and in described grid, grizzly bar gap is (5-20) mm, and the width of described grizzly bar is (400-1500) mm.
Preferably, the operation parameter of described centrifugal blower is: air quantity is more than 70 cubes ms/min, blast is more than 58.8K handkerchief, power is 110 kilowatts.
Preferably, lift pump and acoustooptic alarm system is provided with in described adjustment hydrolytic tank.Every root lift pump is all configured with ball float, and the switch of described ball float is made up of hermetic glass structure mercury, and carrier is made by porous plastics in outside.
Preferably, described waste disposal plant also comprises electric control gear, and the working order of described lift pump is controlled by described electric control gear, and described electric control gear adopts S7 series of PLC automatically to control.
Preferably, described grating tank, described adjustment hydrolytic tank, described A level biochemistry pool, described O level biochemistry pool, described settling tank, described sterilization pool, described sludge thickener are Steel Concrete and construct, described oxygen replenishing equipment and described electric control gear are all arranged in particular requirement structures, and are provided with ventilation, constant temperature, sound insulation system in described room.
Preferably, described handgrip comprises connecting rod, drag head, sealing cover, the first rivet and the second rivet, and described connecting rod is fixed on described transport unit, and described sealing cover, described drag head all adopt with described connecting rod and removably connect.Described seal strip is string rubber, described string rubber be fixed in the outer rim of described transmission mechanism by described first rivet, the other side of described string rubber is fixed on the pool wall of described grating tank by described second rivet.
Preferably, described settling tank is the one that Zhou Jinzhou goes out radical sedimentation basin or vertical sedimentation basin, described settling tank comprises pond body, shore pipe and central canal is provided with in the body of described pond, the vertical end of described shore pipe is connected with described central canal, and the horizontal ends of described shore pipe presses close to the bottom of described pond body inwall.The horizontal ends of described shore pipe offers several mudholes, the bottom of described shore pipe horizontal ends is provided with mud baffle plate, and the bottom of described mud baffle plate water is provided with elastic layer.Described elastic layer is provided with several the first through holes, described mud baffle plate offers several second through holes, the described mudhole on same axis, described first through hole and described second through hole are connected.Gap between the bottom of described elastic layer and the bottom of described pond body inwall is (1-5) cm.
Preferably, described waste disposal plant also comprises modified version coagulation system, and described modified version coagulation system moves forward to described O level biochemistry pool water outlet chemical feeding points position from the import of described sterilization pool.The composition of described filter material layer is the one in Mierocrystalline cellulose, chitosan or sodium alginate, and the porosity of described filter material layer is 10%-80%, and specific surface area is (10.5-13.3) m
2/ g, aperture is 50um-400um.
The present invention also provides a kind of sewage water treatment method of a kind of down-stream treatment station as above-mentioned any one, comprises the steps:
1) sanitary sewage is after filtration devices, enter adjustment hydrolytic tank, and the solid refuse filtered out is sent in garbage cleaning device by transport unit;
2) enter regulate the sewage in hydrolytic tank carry out water quality, the water yield adjustment and dissolved organic matter non-in sewage is retained and progressively changing dissolved organic matter into, being converted into being difficult to biological degradation macromolecular substance the small-molecule substance being easy to degrade;
3) sewage after the process of adjustment hydrolytic tank is promoted in A level biochemistry pool by the effect of lift pump, carries out organism process;
4) sewage after the process of A level biochemistry pool is flowed in O level biochemistry pool, carry out nitration treatment;
5) precipitate in a part of sewage inflow settling tank after O level biochemistry pool nitration treatment, another part sewage backflow carries out denitrification process to A level biochemistry pool;
6) sewage entering settling tank is carried out solid-liquid separation, the mud part be precipitated out is carried in sludge thickener, and another part is carried to A level biochemistry pool and carried out sludge reflux, and water after precipitation flows in sterilization pool;
7) mud carried to sludge thickener carry out dehydration concentrated after, outward transport is disposed, and the water flowed in sterilization pool is after disinfection by chlorine dioxide, directly discharges.
The invention has the advantages that: cover seal strip by the gap between transport unit and grating tank pool wall, prevent refuse from bringing into transport unit on the one hand inner; Improve the stopping property of transport unit and pool wall on the other hand, effectively improve the efficiency of the separation of solid refuse.By being disposed with mud scraper plate and elastic layer in the bottom in the suction pipe road of settling tank, reducing sludge disintegration and floating, improving the rate of recovery of mud.Meanwhile, mud scraper plate plate plays enhancement, and elastic layer according to the concavo-convex degree of pool wall, deformation can occur, and reaches the effect of flexible contact and sealing.By microbial film outstanding in adjustment hydrolytic tank, not only sewage is carried out the adjustment of water quality, the water yield, dissolved organic matter non-in sewage can also be retained and progressively change into dissolved organic matter, by be difficult to biological degradation macromolecular substance be converted into be easy to degrade small-molecule substance, be convenient to the process of rear road.To sludge thickener, do dehydration concentration by being carried by partial sludge in settling tank, and outer running agriculture is fertile, decreasing pollution, carries out secondary use.Further, adopt degradable filtrate, and ensure that filtrate has certain aperture and porosity, microbial film is not easily blocked, contact surface is large, easy to be filmed, long service life, adds conveniently.The introducing of modified version coagulation system, one is substantially improve settling tank outlet effect, and two is significantly reduce fiber rotary disc filter backwashing period, thus larger for stable water outlet assurance up to standard.
Accompanying drawing explanation
Fig. 1 is the schema of the embodiment of the present invention.
Fig. 2 is the topology example figure of grid device in the embodiment of the present invention.
Fig. 3 is the topology example figure of settling tank in the embodiment of the present invention.
Fig. 4 is biomembranous topology example figure in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
As Figure 1-4, the waste disposal plant of a kind of down-stream treatment station of the present embodiment, comprises filtration unit 1, regulates hydrolytic tank 2, A level biochemistry pool 3, O level biochemistry pool 4, settling tank 5, sterilization pool 6, sludge thickener 7, oxygen replenishing equipment and air-lift device 8.Described filtration unit 1, described adjustment hydrolytic tank 2, described A level biochemistry pool 3, described O level biochemistry pool 4, described settling tank 5 and described sterilization pool 6 are connected from front to back successively.Sanitary sewage tentatively filters by described filtration unit 1, and described filtration unit 1 comprises grating tank 11, grid 12, transport unit 13, handgrip 14, seal strip 15 and garbage cleaning device 16.Described grid 12 is fixed in described grating tank 11, and the initiating terminal of described transport unit 13 is arranged on the water outlet of described grating tank 11, and the end of described transport unit 13 is connected with described garbage cleaning device 16.The delivery direction that described handgrip 14 is parallel to described transport unit 13 is successively set on described transport unit 13.Described seal strip 15 is covered on the gap between described transport unit 13 and described grating tank 12 pool wall by rivet.Be hung with microbial film in described adjustment hydrolytic tank 2, described microbial film comprises filter material layer 21, anaerobic layer 22, aerobic layer 23 and hydrophilic layer 24 from the inside to the outside successively.Described air-lift device 8 is pulse air lifting device, carry a part of mud of precipitation in described settling tank 5 in described sludge thickener 7, and in described settling tank 5, another part mud of precipitation is carried in described A level biochemistry pool 3.Described O level biochemistry pool 4 preparation has described oxygen replenishing equipment, and described oxygen replenishing equipment is centrifugal blower.
Described grid 12 is (50-80) ° with the angle of described grating tank 11, and in described grid, grizzly bar gap is (5-20) mm, and the width of described grizzly bar is (400-1500) mm.
The operation parameter of described centrifugal blower is: air quantity is more than 70 cubes ms/min, blast is more than 58.8K handkerchief, power is 110 kilowatts.
Be provided with lift pump 21 and acoustooptic alarm system in described adjustment hydrolytic tank 2, every root lift pump is all configured with ball float, the switch of described ball float is made up of hermetic glass structure mercury, and carrier is made by porous plastics in outside.
Described waste disposal plant also comprises electric control gear 9, is controlled the working order of described lift pump 21 by described electric control gear 9, and described electric control gear adopts S7 series of PLC automatically to control.
Described grating tank 12, described adjustment hydrolytic tank 2, described A level biochemistry pool 3, described O level biochemistry pool 4, described settling tank 5, described sterilization pool 6, described sludge thickener 7 are Steel Concrete and construct, described oxygen replenishing equipment and described electric control gear 9 are all arranged in the house that makes of color steel, and arrange ventilation, sound insulation system in described room.
Described handgrip 14 comprises connecting rod 141, drag head 142 and sealing cover 143, and described connecting rod 141 is fixed on described transport unit 13, and described sealing cover 143, described drag head 142 all adopt with described connecting rod 141 and removably connect.Described seal strip 15 is string rubber, and the side of described string rubber is fixed in the outer rim of described transmission mechanism by the first rivet 171, and the opposite side of described string rubber is fixed on the pool wall of described grating tank by the second rivet 172.
Described settling tank 5 is vertical sedimentation basin, also week radical sedimentation basin can be gone out for entering in week, shore pipe 52 and central canal 51 is provided with in described vertical sedimentation basin, the vertical end of described shore pipe 52 is connected with described central canal 51, and the horizontal ends of described shore pipe 52 presses close to the bottom of described vertical sedimentation basin inwall.The horizontal ends of described shore pipe 52 offers several mudholes 55, the bottom of the horizontal ends of described shore pipe 52 is provided with mud baffle plate 53.The bottom of described mud baffle plate 53 is provided with elastic layer 54, described elastic layer 54 is rubber pad, gap between the bottom of described rubber pad and described vertical sedimentation basin inwall is (1-5) cm, described elastic layer 54 is provided with several first through holes 57, described mud baffle plate 53 offers several second through holes 56, the described mudhole 55 on same axis, described first through hole 57 and described second through hole 56 are connected.
Described waste disposal plant also comprises modified version coagulation system, and described modified version coagulation system moves forward to described O level biochemistry pool 4 water outlet chemical feeding points position from the import of described sterilization pool 6.
The composition of described filter material layer 21 is the one in Mierocrystalline cellulose, chitosan or sodium alginate, and the porosity of described filter material layer 21 is 60%-80%, and specific surface area is (10.5-13.3) m
2/ g, aperture is 50um-400um.
The sewage water treatment method of a kind of down-stream treatment station of the present embodiment, is characterized in that, comprise the steps:
1) sanitary sewage is after filtration unit 1 filters, and enters and regulates hydrolytic tank 2; The solid refuse filtered out is sent in garbage cleaning device 16 by transport unit 13;
2) enter regulate the sewage in hydrolytic tank 2 carry out water quality, the water yield adjustment and dissolved organic matter non-in sewage is retained and progressively changing dissolved organic matter into, being converted into being difficult to biological degradation macromolecular substance the small-molecule substance being easy to degrade;
3) sewage after being processed by adjustment hydrolytic tank 2 is promoted in A level biochemistry pool 3 by the effect of lift pump 21, carries out organism process;
4) sewage after being processed by A level biochemistry pool 3 flows in O level biochemistry pool 4, carries out nitration treatment;
5) the sewage part after O level biochemistry pool 4 nitration treatment is flowed into row precipitation in settling tank 5, another part is back to A level biochemistry pool 3 and carries out denitrification process;
6) sewage entering settling tank 5 is carried out solid-liquid separation, the mud part be precipitated out is carried in sludge thickener 7, and another part is carried to A level biochemistry pool 4 and carried out sludge reflux; And water after precipitation flows in sterilization pool 6;
7), after the mud carried to sludge thickener 7 enters to concentrate, the process of agriculture fertilizer is operated outward by dung-cart; Flow into water in sterilization pool 6 after disinfection by chlorine dioxide, directly discharge.
The foregoing is only the preferred embodiment of the invention; not in order to limit the invention; the any amendment done within all spirit in the invention and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in the invention.
Claims (10)
1. a waste disposal plant for down-stream treatment station, is characterized in that, comprises filtration unit, regulates hydrolytic tank, A level biochemistry pool, O level biochemistry pool, settling tank, sterilization pool, sludge thickener, oxygen replenishing equipment and air-lift device; Described filtration unit, described adjustment hydrolytic tank, described A level biochemistry pool, described O level biochemistry pool, described settling tank and described sterilization pool are connected from front to back successively; Sanitary sewage tentatively filters by described filtration unit, and described filtration unit comprises grating tank, grid, transport unit, handgrip, seal strip and garbage cleaning device; Described grid is fixed in described grating tank, and the initiating terminal of described transport unit is arranged on the water outlet of described grating tank, and the end of described transport unit is connected with described garbage cleaning device; The delivery direction that described handgrip is parallel to described transport unit is successively set on described transport unit; Described seal strip covers on the gap between described transport unit and described grating tank pool wall; Be hung with microbial film in described adjustment hydrolytic tank, described microbial film comprises filter material layer, anaerobic layer, aerobic layer and hydrophilic layer from the inside to the outside successively; Described air-lift device is pulse air lifting device, and a part of mud precipitated in described settling tank is carried in described sludge thickener by described pulse air lifting device, and is carried by another part mud precipitated in described settling tank in described A level biochemistry pool; Described O level biochemistry pool is configured with described oxygen replenishing equipment, and described oxygen replenishing equipment is centrifugal blower.
2. the waste disposal plant of a kind of down-stream treatment station according to claim 1, it is characterized in that, the setting angle of described grid is (50-80) °, in described grid, grizzly bar gap is (5-20) mm, and the width of described grizzly bar is (400-1500) mm.
3. the waste disposal plant of a kind of down-stream treatment station according to claim 1, is characterized in that, the operation parameter of described centrifugal blower is: air quantity is more than 70 cubes ms/min, blast is more than 58.8K handkerchief, power is 110 kilowatts.
4. the waste disposal plant of a kind of down-stream treatment station according to claim 1, is characterized in that, is provided with lift pump and acoustooptic alarm system in described adjustment hydrolytic tank; Every root lift pump is all configured with ball float, and the switch of described ball float is made up of hermetic glass structure mercury, and carrier is made by porous plastics in outside.
5. the waste disposal plant of a kind of down-stream treatment station according to claim 4, it is characterized in that, described waste disposal plant also comprises electric control gear, and the working order of described lift pump is controlled by described electric control gear; Described electric control gear adopts S7 series of PLC automatically to control.
6. the waste disposal plant of a kind of down-stream treatment station according to claim 5, it is characterized in that, described grating tank, described adjustment hydrolytic tank, described A level biochemistry pool, described O level biochemistry pool, described settling tank, described sterilization pool, described sludge thickener are Steel Concrete and construct, described oxygen replenishing equipment and described electric control gear are all arranged in particular requirement structures, and are provided with ventilation, constant temperature, sound insulation system in described room.
7. the waste disposal plant of a kind of down-stream treatment station according to claim 1, it is characterized in that, described handgrip comprises connecting rod, drag head, sealing cover, the first rivet and the second rivet, described connecting rod is fixed on described transport unit, and described sealing cover, described drag head all adopt with described connecting rod and removably connect; Described seal strip is string rubber, described string rubber be fixed in the outer rim of described transmission mechanism by described first rivet, the other side of described string rubber is fixed on the pool wall of described grating tank by described second rivet.
8. the waste disposal plant of a kind of down-stream treatment station according to claim 1, it is characterized in that, described settling tank is the one that Zhou Jinzhou goes out radical sedimentation basin or vertical sedimentation basin, described settling tank comprises pond body, shore pipe and central canal is provided with in the body of described pond, the vertical end of described shore pipe is connected with described central canal, and the horizontal ends of described shore pipe presses close to the bottom of described pond body inwall; The horizontal ends of described shore pipe offers several mudholes, the bottom of described shore pipe horizontal ends is provided with mud baffle plate, and the bottom of described mud baffle plate water is provided with elastic layer; Described elastic layer is provided with several the first through holes, described mud baffle plate offers several second through holes, the described mudhole on same axis, described first through hole and described second through hole are connected; Gap between the bottom of described elastic layer and described pond body inwall is (1-5) cm.
9. the waste disposal plant of a kind of down-stream treatment station according to claim 1, it is characterized in that, described waste disposal plant also comprises modified version coagulation system, and described modified version coagulation system moves forward to chemical feeding points position the water outlet of described O level biochemistry pool from the import of described sterilization pool; The composition of described filter material layer is the one in Mierocrystalline cellulose, chitosan or sodium alginate, and the porosity of described filter material layer is 10%-80%, and specific surface area is (10.5-13.3) m
2/ g, aperture is 50um-400um.
10. a sewage water treatment method for a kind of down-stream treatment station according to above-mentioned any one, is characterized in that, comprise the steps:
1) sanitary sewage is after filtration devices, enter adjustment hydrolytic tank, and the solid refuse filtered out is sent in garbage cleaning device by transport unit;
2) enter regulate the sewage in hydrolytic tank carry out water quality, the water yield adjustment and dissolved organic matter non-in sewage is retained and progressively changing dissolved organic matter into, being converted into being difficult to biological degradation macromolecular substance the small-molecule substance being easy to degrade;
3) sewage after the process of adjustment hydrolytic tank is promoted in A level biochemistry pool by the effect of lift pump, carries out organism process;
4) sewage after the process of A level biochemistry pool is flowed in O level biochemistry pool, carry out nitration treatment;
5) precipitate in a part of sewage inflow settling tank after O level biochemistry pool nitration treatment, another part sewage backflow carries out denitrification process to A level biochemistry pool;
6) sewage entering settling tank is carried out solid-liquid separation, the mud part be precipitated out is carried in sludge thickener, and another part is carried to A level biochemistry pool and carried out sludge reflux, and water after precipitation flows in sterilization pool;
7) mud carried to sludge thickener carry out dehydration concentrated after, outward transport is disposed, and the water flowed in sterilization pool is after disinfection by chlorine dioxide, directly discharges.
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