CN201857326U - Rotary-liquid solid-liquid separation type SBR (Sequencing Batch Reactor Activated Sludge Process) domestic sewage treatment device - Google Patents

Rotary-liquid solid-liquid separation type SBR (Sequencing Batch Reactor Activated Sludge Process) domestic sewage treatment device Download PDF

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Publication number
CN201857326U
CN201857326U CN 201020567396 CN201020567396U CN201857326U CN 201857326 U CN201857326 U CN 201857326U CN 201020567396 CN201020567396 CN 201020567396 CN 201020567396 U CN201020567396 U CN 201020567396U CN 201857326 U CN201857326 U CN 201857326U
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China
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reaction tank
pipe
sbr
water inlet
sewage treatment
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CN 201020567396
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马建立
邓小文
卢学强
张涛
籍鹏飞
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TIANJIN UNITED ENVIRONMENTAL PROTECTION ENGINEERING DESIGN Co Ltd
Tianjin Academy of Environmental Sciences
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TIANJIN UNITED ENVIRONMENTAL PROTECTION ENGINEERING DESIGN Co Ltd
Tianjin Academy of Environmental Sciences
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Abstract

The utility model relates to a rotary-liquid solid-liquid separation type SBR (Sequencing Batch Reactor Activated Sludge Process) domestic sewage treatment device comprising a vertical flow type SBR reaction tank, a water inlet pipe, an intermittent aeration device, a water outlet pipe and a mud discharge pipe. The device is characterized in that the upper part of the side wall of the reaction tank is provided with an overflow pipe, and a suspended packed bed is arranged in the tank; and a tangential water inlet pipe at the upper part of an additionally arranged hydrocyclone separator is connected with the overflow pipe, a mud return pipe at the bottom of the hydrocyclone separator is connected at the bottom of the side wall of the reaction tank communicated with the mud discharge pipe, and the water inlet pipe is arranged at the top of the hydrocyclone separator; and the volume of the suspended packed bed occupies 60 to 80 percent of volume of the reaction tank, and the volume ratio of the reaction tank to that of the hydrocyclone separator is 5:1 to 9:1; and the application steps are as follows: firstly: biofilm formation culturing at the suspended packed bed; secondly: normal operation of SBR, continuous water inlet and outlet and intermittent aeration; and thirdly: water discharge. The device has the advantages of increasing the denitrification and dephosphorization efficiency as well as the utilization rate of tank volume, having stable water quality and saving the construction investment.

Description

A kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit
Technical field
The utility model belongs to field of environment engineering technology, relates to the SBR waste disposal plant, relates in particular to a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit.
Background technology
In recent years, along with quickening of urbanization process, China's water resources is faced with pollutes serious crisis day by day.According to " Chinese environmental situation bulletin in 2009 ", national wastewater emission amount was 589.2 hundred million tons in 2009, increased by 3.0% than the last year, and pollution in various degree appears in seven big water systems such as the Changjiang river, the Yellow River.What storehouse, emphasis lake water quality nitrogen and phosphorus pollutants was lower than V class water quality standard accounts for 53.8%.And areas such as the especially middle samll cities and towns in China some areas, rural area, the characteristics of sanitary sewage are: the water yield is disperseed, carbon source deficiency in the water quality, and nitrogen and phosphorus content is higher, and existing water technology is as A 2O, UASB, activated sludge process, oxidation ditch process, SBR method etc. because investment and running cost are higher, obviously are difficult to apply.
SBR is the abbreviation of sequence intermittent activated sludge process (Sequencing Batch ReactorActivated SludgeProcess), is a kind of active sludge sewage disposal technology that moves by the intermittent aeration mode, claims sequencing batch active sludge again.Britain slip-stick artist Thomas Wardle in 1898 find the technology of intermittent operation first, and since 1979, the SBR activated sludge method has successively obtained extensive utilization in the sewage treatment area of industrially developed country such as the U.S., Germany, Japan.Different with traditional waste water treatment process, the SBR process using unites two into one aeration tank and settling tank, and biochemical reaction presents in batches and carries out, and the groundwork cycle can be made up of water inlet, reaction, precipitation, draining and idle five stages.Its principal character be in operation in order and periodical operation, the core of SBR technology is the sbr reactor pond, this pond collects homogenizing, heavy, biological degradation just, two functions such as heavy in a pond, no mud return-flow system.When main reaction region is in when stopping whipped state and carrying out denitrification, the sewage that enters continuously provides denitrification required carbon source, thereby has improved nitric efficiency.Because SBR technology has formed handiness on its operation in the characteristics on time and the space, according to different condition of water quality, use occasion and water outlet requirement, many new change and progress have been arranged, and novel process such as ICEAS (Intermittent Cyclic ExtendedAeration System) method, CASS (Cyclic Activated Sludge System) method, UNITANK method, MSBR (Modified Sequencing Batch Reactor) method are developed in this field in succession now.SBR technology is fit to handle little water yield trade effluent and disperse point-source pollution very much, and especially in the place of land used anxiety, the processing of centering small town sewage has bigger advantage.
But, SBR process using periodic running mode, water level rises to the highest needs certain perdurabilities by minimum during water inlet, and water level is reduced to minimum whole discharge and is also needed certain perdurability by the highest during water outlet, therefore influences processing efficiency, and utilization rate of tank volume is low; In addition, the intermittent type water outlet requires to concentrate big volume exhaust, if rising pipe shape and direction are improper, can take away a large amount of active sludge during water outlet, moreover hydrophone is strained in the setting of SBR arts demand, drain the supernatant water of active sludge post precipitation, but strain the equipment complexity of hydrophone, failure rate height, disturbance sludge blanket during water outlet, make the effluent quality instability, influence nitrogen phosphorus removal effect, also increased the running cost of SBR technology, influenced applying of this technology.
The utility model content
Main purpose of the present utility model is to improve on the basis of existing SBR technology at the problems referred to above, provide a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit, this device is by being provided with suspended packing bed in the sbr reactor pond, and set up wet cyclone in outside, sbr reactor pond, replaced and strained hydrophone, realized the operation scheme of the be back to back water and the spinning liquid solid-liquid separation in sbr reactor pond; The sanitary sewage that adopts this device to handle can reach and improve denitrogenation dephosphorizing efficient, water conditioning and the effect that cuts down the consumption of energy, saves construction investment.
Design philosophy of the present utility model and principle are:
(1) set up suspended packing bed in vertical-flow sbr reactor pond, the volume of suspended packing bed accounts for the 60-80% of sbr reactor pool volume.Biochemical sludge will adhere to and breed a large amount of aerobic microbiologicals and anaerobion on the floating stuffing ball after the success of suspended packing bed biofilm, form immobilized microorganism filter membranous layer.The floating stuffing ball of suspended packing bed is the passage that cell texture can be used as microorganism panning food, oxygen and excretion metabolism thing, make attached to the microorganism filter membranous layer on the floating stuffing ball and have aerobic, anoxic and three kinds of microenvironments of anaerobism simultaneously, both the nitrated of organic aerobic decomposition, ammonia nitrogen can be carried out, anaerobic hydrolysis and denitrification etc. can be carried out again.Owing to can carry out inner mass transfer, correlated response processes such as nitrated/denitrification and hydrolysis/aerobic oxidation can be carried out in same floating stuffing ball in succession, improved the nitric efficiency of biochemical sludge thus.
The operation in sbr reactor pond, adopt the mode of intermittent aeration, the water of being back to back, make by the dissolved oxygen of control in the sewage to be in aerobic, anaerobism alternating state in the pond, finish nitrosification, nitrated, denitrification, poly-phosphorus, remove the biochemical reaction process of organic pollutant.Effectively improve the utilization rate of tank volume in sbr reactor pond, reduced lness ratio of plant.
(2) set up wet cyclone outside vertical-flow sbr reactor pond, wet cyclone utilizes centrifugal principle, both can carry out wet separation to the solid suspended particle in the 5-250 mu m range, also can and concentrate the suspension separation.Microbial film that comes off owing to metabolism on the suspended packing bed and the suspended solid in the water body reach solid-liquid separation by wet cyclone purpose.Supernatant liquor is discharged by the water outlet on top, and the sludge liquid part after concentrating refluxes by mud return line, and the part sludge liquid is discharged, and has both reached to keep the purpose of microorganism with the control sludge age, has guaranteed the phosphor-removing effect in sbr reactor pond again.
Adopt wet cyclone, omitted the baroque hydrophone equipment of straining, improved separating effect, and eliminate the disadvantage that active sludge runs off in the prior art, guarantee stable effluent quality; Apparatus structure is simple, floor space is little, treatment capacity is big and cost of equipment is low, and with the combined action of sbr reactor device, water outlet SS is low.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit, comprise vertical-flow sbr reactor pond, be located at the water inlet pipe of described reaction tank sidewall bottom, be located at the intermittent aeration device of reaction tank bottom, rising pipe and shore pipe, it is characterized in that being provided with upflow tube, in reaction tank, be provided with suspended packing bed between water inlet pipe and the upflow tube in described reaction tank side wall upper part; And set up wet cyclone, the tangential water inlet pipe of being located at wet cyclone top is connected with described upflow tube, the mud return line of being located at the wet cyclone bottom is connected to reaction tank sidewall bottom, and described shore pipe is communicated with mud return line, and described rising pipe is arranged on the wet cyclone top.
Described suspended packing bed is by being arranged at the upper and lower orifice plate in the described sbr reactor pond and scattering therebetween some The floating stuffing ball of-15cm constitutes, and the volume of suspended packing bed accounts for the 60-80% of sbr reactor pool volume.
The volumetric ratio of described sbr reactor pond and wet cyclone is 5: 1-9: 1.
Micro-hole aerator that described intermittent aeration device is adjustable aeration rate or perforated pipe aerating regulation device.
The beneficial effects of the utility model are: (1) is provided with suspended packing bed in the sbr reactor pond, the biofilm microbe species is abundant, biomass is big, strengthened the denitrogenation dephosphorizing function, effects of purification quality significantly improves, and does not have fault such as equipment obstruction and occur, and nitrogen removal rate reaches more than 77%, total tp removal rate reaches more than 70%, is higher than the prior art result; (2) adopt wet cyclone to carry out solid-liquid separation, improved separating effect, eliminated the disadvantage that active sludge runs off in the prior art, and guarantee stable effluent quality; Apparatus structure is simple, movement-less part, floor space is little, treatment capacity is big and cost of equipment is low, with the combined action of sbr reactor device, has omitted and has strained hydrophone, and water outlet SS reduces; (3) adopt this device to realize the water running of being back to back, effectively improved the utilization rate of tank volume in sbr reactor pond, reduced lness ratio of plant; (4) investment cost is low, and anti impulsion load is strong, and operation is convenient, for ease of maintenaince, is particularly suitable for the sanitary sewage disposal of the medium and small water yield.
Description of drawings
Fig. 1 is the structural representation of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit;
Fig. 2 is that the A of wet cyclone part among Fig. 1 is to view.
Among the figure: 1SBR reaction tank, 2 suspended packing beds, 21 up-hole plates, 22 floating stuffing balls, 23 orifice plates, 3 intermittent aeration devices, 4 water inlet pipes, 5 belt water distributors, 6 mud return lines, 7 shore pipes, 8 wet cyclones, 81 cylinders, 82 circular cone tubes, 9 rising pipes, 10 upflow tubes, 11 tangential water inlet pipes.
Embodiment 1
Fig. 1-Fig. 2 illustrates a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit, comprise vertical-flow sbr reactor pond 1, be located at the water inlet pipe 4 of described reaction tank sidewall bottom, be located at the intermittent aeration device 3 of reaction tank bottom, rising pipe 9 and shore pipe 7, it is characterized in that being provided with upflow tube 10, in reaction tank, be provided with suspended packing bed 2 between water inlet pipe 4 and the upflow tube 10 in above-mentioned reaction tank side wall upper part; And set up wet cyclone 8, the tangential water inlet pipe 11 of being located at wet cyclone top is connected with described upflow tube 10, the mud return line 6 of being located at the wet cyclone bottom is connected to reaction tank sidewall bottom, above-mentioned shore pipe 7 is communicated with mud return line 6, and above-mentioned rising pipe 9 is arranged on wet cyclone 8 tops.In the present embodiment, 1 bottom, above-mentioned sbr reactor pond is provided with the water distributor 5 that goes in ring, and above-mentioned water inlet pipe 4 is connected with belt water distributor 5.Micro-hole aerator that above-mentioned intermittent aeration device is adjustable aeration rate or perforated pipe aerating regulation device.
Above-mentioned suspended packing bed 2 is by being arranged at up-hole plate 21 in the above-mentioned sbr reactor pond, orifice plate 23 and scattering therebetween some The floating stuffing ball 22 of-15cm constitutes, and the floating stuffing ball is the commercially available prod.The volume of suspended packing bed accounts for the 60-80% of sbr reactor pool volume, and above-mentioned sbr reactor pond 1 is 5 with the volumetric ratio of wet cyclone 8: 1-9: 1, in actual applications, determine according to handling water yield size and sbr reactor pool volume load.
Wet cyclone 8 is the commercially available prod also, is used for the mixed solution after handling is carried out solid-liquid separation in the utility model.Mainly constitute by top cylinder 81, lower cone tube 82 and the tangential water inlet pipe 10 that is arranged on cylinder 8 outsides.Wet cyclone utilizes centrifugal principle, both can carry out wet separation to the solid suspended particle in the 5-250 mu m range, also can and concentrate the suspension separation.During work, feed liquid is entered with tangential direction by cylindrical portions may, rotate and produce centrifugal force, it is more violent to come downwards to circular cone tube part, the liquid that solids in the feed liquid or density are bigger is subjected to action of centrifugal force to be thrown to barrel, and along barrel by flowing to the mud return line 6 that is connected with end mouth under the spiral-line, clarifying liquid then rises, and is flowed out by the rising pipe 9 that is connected top center.This device advantage is a simple structure, and volume is little, and floor space is also little; Throughput is big; Isolating granulometric range is wider.
Below be the application method of the spinning liquid solid-liquid separation formula SBR technology sewage treatment unit among the embodiment 1 by the explanation of three running examples.
Embodiment 2-1
Present embodiment is chosen living quarters, Tianjin waste water, and waste water quality is as follows: pH is 6-8, and SS is 158.3mg/L, and COD is 204mg/L, and ammonia nitrogen is 29.5mg/L, and total nitrogen is TN 31.7mg/L, and total phosphorus is TP 3.1mg/L.
8 of sbr reactor pond 1 and wet cyclone volumetric ratio is 9: 1 in this example, and the volume of suspended packing bed accounts for 60% of sbr reactor pool volume, has adopted The floating stuffing ball, the intermittent aeration device adopts the perforated pipe aerating regulation device of adjustable aeration rate.
The application method of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit comprises the steps:
(1). the suspended packing bed biofilm is cultivated: by 1 water-in, 4 water inlets of sbr reactor pond, the inoculation aerobic sludge, seed sludge is selected certain Sewage Plant Aerobic Pond returned sluge for use, and sbr reactor pool volume load is 0.4kgBOD/kgd, sludge index SVI is 120mL/g, and the flooding quantity of design is 100L/h.With the aeration rate continuous aeration of 40L/h after 5 days, floating stuffing ball 22 surfaces are faint yellow, at this moment, beginning by 30% of design flooding quantity is the 30L/h water of being back to back, obviously increase to the 3rd all floating stuffing ball 22 surface biological film thicknesses, floating stuffing ball 22 outward appearances change into light brown gradually, the microbial film of getting on it carries out microscopy, can find out that biophase is very abundant, contain a large amount of bacteriums, zoogloea, campanularian, tired branch worm, wheel animalcule, heliozooid, ciliate, nematodes etc. indicate that microbial film is ripe, the biofilm success, at this moment, the suspended packing bed biofilm cultivate to finish, and illustrates that SBR technology can normally move.
(2) .SBR technology is normally moved: this stage, intermittent aeration is taked in the sbr reactor pond, the mode of the water of being back to back is moved, by the design flooding quantity 100L/h water of being back to back, enter the oepration at full load state, and beginning is with aeration rate 25-40L/h intermittent aeration, by air pump, gas meter control aeration rate makes to be in aerobic, anaerobism alternating state in the pond; Adopt dissolved oxygen meter that dissolved oxygen is monitored, 2 hours aerobic residence time phase, dissolved oxygen is 3mg/L, 3 hours anaerobic phase residence time, dissolved oxygen is 0.56mg/L, and sewage stops an aerobic phase and an anaerobic phase at reaction tank, and the residence time is 5 hours.Therebetween, reaction tank produces the biochemical reaction process that ammonia nitrogen is converted into nitric nitrogen when aeration, at first be that Nitrite bacteria is with NH 4 +-N is converted into NO 2The nitrosification process of-N is with NO then by nitrate bacterium 2 --N further is oxidized to NO 3 -The nitrifying process of-N.Reaction tank is when stopping aeration, and the sbr reactor pond is in static condition, and along with the continuous consumption of oxygen in the reaction tank, reaction tank progresses into anaerobic state.Under anaerobism or anoxia condition, microorganism is directly with NH 4 +-N is an electron donor, with NO 3 -Or NO 2 -Be electron acceptor(EA), with NH 4 +-N, NO 3 --N or NO 2 --N changes N into 2
(3). water outlet: the water outlet in sbr reactor pond enters wet cyclone 8 via tangential water inlet 11 with the flow velocity of 70m/s by upflow tube 10 and carries out the spinning liquid solid-liquid separation, supernatant flows out from the rising pipe 9 at wet cyclone top, sludge liquid after concentrating is back to sbr reactor pond 1 with 60% the mud return line 6 of return sludge ratio bottom wet cyclone, the part sludge liquid is discharged by shore pipe 7 next day, so far, a circulation is finished; So go round and begin again and move continuously, carry out sanitary sewage disposal.
Through foundation GB testing method effluent quality is measured: the COD clearance is 95.5%, and ammonia nitrogen removal frank is 97%, and nitrogen removal rate is 80.1%, and total tp removal rate is 73.6%.SS is 4mg/L, and water conditioning.Final outflow water water quality satisfies " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) middle one-level A emission standard.
Embodiment 2-2
Present embodiment is chosen the Tianjin sewage work former water that is untreated, and waste water quality is as follows: pH is 6-8, and SS is 325.0mg/L, and COD is 324mg/L, and ammonia nitrogen is 36.1mg/L, and total nitrogen TN is 42.7mg/L, and total phosphorus TP is 5.7mg/L.
8 volumetric ratio of sbr reactor pond 1 and wet cyclone is 5: 1.The volume of suspended packing bed accounts for 80% of sbr reactor pool volume, has adopted The floating stuffing ball, the intermittent aeration device adopts the perforated pipe aerating regulation device of adjustable aeration rate.
The working method of present embodiment and reaction mechanism reach step (1)~(3) with embodiment 1, and difference is: sbr reactor pool volume load is 1kgBOD/kgd in the step (1), and sludge index SVI is 180mL/g, and the flooding quantity of design is 2000L/h; 4 hours aerobic residence time phase in the step (2), dissolved oxygen is 4mg/L, and 6 hours anaerobic phase residence time, dissolved oxygen is 1.51mg/L, and sewage stops an aerobic phase and an anaerobic phase at reaction tank, and the residence time is 10 hours; Sbr reactor pond and wet cyclone volumetric ratio are 5: 1 in the step (3), and the wet cyclone inlet velocity is 50m/s, and the sludge liquid after concentrating is back to the sbr reactor pond with 120% the mud return line of return sludge ratio bottom wet cyclone.
Through foundation GB testing method effluent quality is measured: the COD clearance is 89.5%, and ammonia nitrogen removal frank is 95%, and nitrogen removal rate is 77.5%, and total tp removal rate is 70.3%.SS is 8mg/L, and water conditioning.Final outflow water satisfies one-level A emission standard among " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002).
Embodiment 2-3
Present embodiment is chosen living quarters, Tianjin waste water, and waste water quality is as follows: pH is 6-8, and SS is 158.3mg/L, and COD is 204mg/L, and ammonia nitrogen 29.5mg/L, total nitrogen are TN 31.7mg/L, and total phosphorus is TP 3.1mg/L, and the flooding quantity of design is 400L/h.
8 volumetric ratio of sbr reactor pond 1 and wet cyclone is 8: 1.The volume of suspended packing bed accounts for 60% of sbr reactor pool volume, has adopted The floating stuffing ball, the intermittent aeration device adopts the perforated pipe aerating regulation device of adjustable aeration rate.
The working method of present embodiment and reaction mechanism are with step (1)~(3) of embodiment 1, and difference is: sbr reactor pool volume load is 0.6kgBOD/kgd in step (1), and sludge index SVI is 150mL/g, and the flooding quantity of design is 400L/h; 3 hours aerobic residence time phase in the step (2), dissolved oxygen is 3mg/L, and 5 hours anaerobic phase residence time, dissolved oxygen is 1mg/L, and sewage stops an aerobic phase and an anaerobic phase at reaction tank, and the residence time is 8 hours; The wet cyclone inlet velocity is 60m/s in the step (3), and the sludge liquid after concentrating is back to the sbr reactor pond with 100% the mud return line of return sludge ratio bottom wet cyclone.
Through foundation GB testing method effluent quality is measured: the COD clearance is 92.5%, and ammonia nitrogen removal frank is 98%, and nitrogen removal rate is 79%, and total tp removal rate is 74.6%, and SS is 6mg/L, and water conditioning.Final outflow water satisfies one-level A emission standard among " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002).
The above only is a preferred embodiment of the present utility model, is not content of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims (4)

1. spinning liquid solid-liquid separation formula SBR technology sewage treatment unit, comprise vertical-flow sbr reactor pond, be located at the water inlet pipe of described reaction tank sidewall bottom, be located at the intermittent aeration device of reaction tank bottom, rising pipe and shore pipe, it is characterized in that being provided with upflow tube, in reaction tank, be provided with suspended packing bed between water inlet pipe and the upflow tube in described reaction tank side wall upper part; And set up wet cyclone, the tangential water inlet pipe of being located at wet cyclone top is connected with described upflow tube, the mud return line of being located at the wet cyclone bottom is connected to reaction tank sidewall bottom, and described shore pipe is communicated with mud return line, and described rising pipe is arranged on the wet cyclone top.
2. a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit according to claim 1 is characterized in that described suspended packing bed is by being arranged at the upper and lower orifice plate in the described sbr reactor pond and scattering therebetween some The floating stuffing ball of-15cm constitutes, and the volume of suspended packing bed accounts for the 60-80% of sbr reactor pool volume.
3. a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit according to claim 1 and 2, the volumetric ratio that it is characterized in that described sbr reactor pond and wet cyclone is 5: 1-9: 1.
4. a kind of spinning liquid solid-liquid separation formula SBR technology sewage treatment unit according to claim 1 is characterized in that micro-hole aerator or perforated pipe aerating regulation device that described intermittent aeration device is adjustable aeration rate.
CN 201020567396 2010-10-19 2010-10-19 Rotary-liquid solid-liquid separation type SBR (Sequencing Batch Reactor Activated Sludge Process) domestic sewage treatment device Expired - Lifetime CN201857326U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973674A (en) * 2010-10-19 2011-02-16 天津市环境保护科学研究院 Hydrocyclone solid-liquid separation type SBR-technique domestic sewage treatment device and application method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101973674A (en) * 2010-10-19 2011-02-16 天津市环境保护科学研究院 Hydrocyclone solid-liquid separation type SBR-technique domestic sewage treatment device and application method thereof
CN101973674B (en) * 2010-10-19 2013-01-02 天津市环境保护科学研究院 Hydrocyclone solid-liquid separation type SBR-technique domestic sewage treatment device and application method thereof

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