CN218811184U

CN218811184U - Sewage treatment system

Info

Publication number: CN218811184U
Application number: CN202222970983.4U
Authority: CN
Inventors: 刘洋城; 宋建超; 肖学权; 杨彬; 刘浪
Original assignee: Jereh Environment Engineering Technology Co ltd
Current assignee: Jereh Environment Engineering Technology Co ltd
Priority date: 2022-11-08
Filing date: 2022-11-08
Publication date: 2023-04-07
Anticipated expiration: 2032-11-08

Abstract

The application relates to a sewage treatment system, which comprises a box body, wherein the interior of the box body is divided into an anoxic tank, an anaerobic tank, an aerobic tank, a sedimentation tank, an intermediate tank, a filtering tank, a clean water tank and an equipment tank which are sequentially communicated through a plurality of partition plates; the backflow tank is arranged in the box body, one end of the backflow tank is communicated with sewage, the backflow tank is communicated with the upper part of the anoxic tank through a first through hole, so that the sewage flows into the anoxic tank from the upper part of the anoxic tank, and the sewage in the anoxic tank flows to the anaerobic tank through the bottom of the anoxic tank; and the first aeration device is arranged at the bottom of the anoxic tank. The method can solve the problems that the nitrate in the returned sludge has adverse effects on the phosphorus accumulating bacteria in the traditional process, the denitrification reaction is not uniformly distributed on the carbon source and the like, and can achieve higher nitrogen and phosphorus removal efficiency.

Description

Sewage treatment system

Technical Field

The application relates to the technical field of sewage treatment, in particular to a sewage treatment system.

Background

With the development of the economic society of China, the water resource crisis and the water environment pollution are increasingly aggravated, the discharge amount of various sewage is greatly increased, the water environment is seriously threatened, and the method becomes one of the focuses of the domestic environmental protection field.

In recent years, a plurality of policies related to environmental protection and treatment are provided in China, the gravity center of the policy is gradually shifted from urban pollution treatment to rural environmental comprehensive treatment and transfer, and rural sewage treatment becomes an environmental protection problem to be solved. The characteristics of rural sewage distribution dispersion, imperfect pipe network coverage, less water amount and unstable water amount in China are combined, the simple and efficient integrated sewage treatment equipment is applied and used, the conventional integrated sewage treatment equipment mainly adopts the traditional process to treat sewage, the nitrate in the return sludge can generate adverse effect on an anaerobic tank because the anaerobic tank is in front, and denitrification is in an adverse position on carbon source distribution because the anoxic tank is positioned at the downstream of the anaerobic tank, so that the denitrification effect of a system is influenced, and phosphorus-accumulating bacteria accumulate phosphorus-absorbing power in the anaerobic tank and are inefficiently consumed in an anoxic section, so that the denitrification and dephosphorization efficiency is lower.

SUMMERY OF THE UTILITY MODEL

The main aim of this application provides a sewage treatment system, can solve the adverse effect that nitrate produced to phosphorus accumulating bacteria in the backward flow mud among the traditional handicraft to and the uneven scheduling problem of distribution of denitrification on the carbon source, can reach higher nitrogen and phosphorus removal efficiency.

The application provides a sewage treatment system, includes:

the interior of the box body is divided into an anoxic tank, an anaerobic tank, an aerobic tank, a sedimentation tank, an intermediate tank, a filtering tank, a clean water tank and an equipment tank which are communicated in sequence through a plurality of partition plates;

the backflow tank is arranged in the box body, one end of the backflow tank is communicated with sewage, the backflow tank is communicated with the upper part of the anoxic tank through a first through hole, so that the sewage flows into the anoxic tank from the upper part of the anoxic tank, and the sewage in the anoxic tank flows to the anaerobic tank through the bottom of the anoxic tank; and

the first aeration device is arranged at the bottom of the anoxic tank.

In an alternative of this application, be provided with the support frame in the anaerobism pond, be provided with filler device on the support frame.

In an alternative of this application, be provided with suspended packing and second aeration equipment in the aerobic tank, still be provided with first air-lift device in the aerobic tank, first air-lift device with the backward flow groove is connected, so that in the aerobic tank sewage passes through the backward flow groove flows to the oxygen deficiency pond.

In an alternative of this application, good oxygen pond through first water pipe with the sedimentation tank intercommunication, be provided with medicine mixing arrangement on the first water pipe.

In an alternative of this application, be provided with degassing unit and add the medicine bucket in the equipment pond, the clean water basin through first outlet pipe with degassing unit connects, degassing unit goes out water piping connection through the second add the medicine bucket, add the medicine bucket still with it is linked together to add the medicine mixing arrangement.

In an alternative of the present application, a grille means is provided on the first water passing pipe.

In an alternative of this application, still be provided with bagger and mud discharging device in the sedimentation tank, be provided with the second air stripping device on the bagger, the second air stripping device with the backward flow groove is connected so that sewage in the sedimentation tank passes through the backward flow groove flows to the oxygen deficiency pond.

In an alternative of this application, from last to being provided with out mill weir, filter screen, precoat and pipeline subassembly down in the filter tank, the pipeline subassembly includes inlet tube and mud pipe, the inlet tube with middle pond is linked together.

In an alternative of this application, the inlet tube pass through the water distribution corridor with the intermediate tank intercommunication, be provided with the filter plate on the water distribution corridor, be provided with the aeration pipe on the filter plate and a plurality of water distribution hole.

In an alternative of the present application, a backwash pump is provided in the equipment tank, and in a first state, the backwash pump is used for conveying water in the intermediate tank to the filtration tank; and in a second state, the backwashing pump is used for conveying the water in the clean water tank to the filtering tank for backwashing.

According to the sewage treatment system provided by the embodiment of the application, the sewage treatment system comprises a box body, and the interior of the box body is divided into an anoxic tank, an anaerobic tank, an aerobic tank, a sedimentation tank, an intermediate tank, a filtering tank, a clean water tank and an equipment tank which are sequentially communicated through a plurality of partition plates; the backflow tank is arranged in the box body, one end of the backflow tank is communicated with sewage, the backflow tank is communicated with the upper part of the anoxic tank through a first through hole, so that the sewage flows into the anoxic tank from the upper part of the anoxic tank, and the sewage in the anoxic tank flows to the anaerobic tank through the bottom of the anoxic tank; and the first aeration device is arranged at the bottom of the anoxic tank. The traditional A/based judgment can be realized by arranging the anoxic tank at the upstream of the anaerobic tank and the aerobic tank at the downstream of the anaerobic tank ² The adverse effect of nitrate in the returned sludge on the phosphorus accumulating bacteria in the O process, the uneven distribution of denitrification reaction on a carbon source and the like can achieve higher nitrogen and phosphorus removal efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 shows a schematic overall structure diagram of a sewage treatment system provided by an embodiment of the present application.

The reference numerals are explained below:

1. a reflux tank; 2. an anoxic tank; 3. combining fillers; 4. an anaerobic tank; 5. MBBR filler; 6. an aerobic tank; 7. a sedimentation tank; 8. a water collection tank; 9. an intermediate tank; 10. an equipment pool; 11. an electric control cabinet; 12. a backwash pump; 13. a sterilizing device; 14. a vortex fan; 15. a medicine adding barrel; 16. a clean water tank; 17. a filtering tank; 18. a grille arrangement; 19. a box body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

FIG. 1 shows a schematic structural diagram of a sewage treatment system provided by an embodiment of the present application.

As shown in fig. 1, the present application provides a sewage treatment system, which includes a box 19, and the inside of the box 19 is divided into an anoxic tank 2, an anaerobic tank 4, an aerobic tank 6, a sedimentation tank 7, an intermediate tank 9, a filter tank 17, a clean water tank 16, and an equipment tank 10, which are sequentially communicated with each other, by a plurality of partition plates. A backflow tank 1 is further arranged in the box body 19, one end of the backflow tank 1 is communicated with sewage, the backflow tank 1 is communicated with the upper portion of the anoxic tank 2 through a first through hole, so that the sewage flows into the anoxic tank 2 from the upper portion of the anoxic tank 2, and the sewage in the anoxic tank 2 flows to the anaerobic tank 4 through the bottom of the anoxic tank 2; the bottom of the anoxic tank 2 is provided with a first aeration device.

By placing the anoxic tank 2 upstream of the anaerobic tank 4 and the aerobic tank 6 downstream of the anaerobic tank 4, the traditional A- ² The adverse effect of nitrate in the returned sludge on the phosphorus accumulating bacteria in the O process, the uneven distribution of denitrification reaction on a carbon source and the like can achieve higher nitrogen and phosphorus removal efficiency.

Specifically, the box 19 is the carrier of each function pool combination, and equipment pond 10 is equipped with automatically controlled cabinet 11, sealing door, telescopic cat ladder and axial fan, and sealing door adopts the enclosed construction design, can effectively prevent wind rain-proof, axial fan and temperature detector and automatically controlled cabinet 11 electric connection.

Be equipped with the biofilm carrier support in the oxygen deficiency pond 2, the filler in the oxygen deficiency pond 2 adopts combination filler 3, sewage promotes from the elevator pump, the reflux tank 1 through box 19 enters into oxygen deficiency pond 2 from the top of oxygen deficiency pond 2, simultaneously, nitrify liquid and mud reflux and sewage entering oxygen deficiency pond 2 together, the water inlet mode is for advancing from top to bottom, the mud backward flow is earlier at the oxygen deficiency pond 2 of backward flow, nitrate nitrogen carries out denitrification reaction at oxygen deficiency pond 2 under the effect of microorganism, thereby can reduce excessive nitrate nitrogen and get into anaerobic tank 4, destroy the anaerobic environment in anaerobic tank 4 and influence the dephosphorization rate of system, organic matter hydrolysis who carries out in the anaerobic zone provides the optimal environment.

The bottom of the anoxic tank 2 is provided with a first aeration device which can adopt an intermittent aeration device, the first aeration device can effectively prevent sludge from settling and accumulating in the anoxic tank 2, and simultaneously, the aerobic bacteria, the anaerobic bacteria and the denitrifying bacteria in the sludge are promoted to degrade COD (Chemical-Oxygen-Demand) content in sewage and wastewater, and a denitrification reaction is carried out, so that the denitrification efficiency of the system is improved.

The bottom of the partition plate between the anoxic tank 2 and the anaerobic tank 4 is provided with a water passing hole, and sewage after the preliminary reaction in the anoxic tank 2 enters the anaerobic tank 4 through the water passing hole at the bottom of the partition plate between the anoxic tank 2 and the anaerobic tank 4.

A support frame is arranged in the anaerobic tank 4, and a filling device is arranged on the support frame. The support frame is including setting up in the left side of the inside cavity in anaerobism pond 4 and the branch on right side, and branch provides the support for the packing device, avoids the bottom contact of packing device and box 19, and branch leaves certain distance with the bottom of the case to make the sewage in the oxygen deficiency pond 2 can follow and cross in the water hole enters into anaerobism pond 4. Optionally, the certain distance is 400mm, which ensures that the sewage can be uniformly contacted with the filling device in the anaerobic tank 4.

Optionally, the filler device comprises a combined filler 3, the combined filler 3 is composite fiber, so that anaerobic bacteria can be conveniently cultured, and the organic matters in the sewage are subjected to an ammoniation reaction and a small amount of denitrification reaction under the action of microorganisms; the sewage treated in the anaerobic tank 4 enters the aerobic tank 6.

A suspended filler and a second aeration device are arranged in the aerobic tank 6, a first air-lifting device is also arranged in the aerobic tank 6 and is connected with the reflux tank 1, so that the sewage in the aerobic tank 6 flows to the anoxic tank 2 through the reflux tank 1

After sewage enters the aerobic tank 6, dissolved oxygen in the sewage is maintained at about 2.0mg/L-3.0mg/L through a second aeration device of the aerobic tank 6, the main function is to enable active sludge to perform aerobic respiration and further decompose and convert organic matters so as to achieve the purpose of removing pollutants, a filler of the aerobic tank 6 is a suspended filler, the second aeration device adopts a micropore aeration device, under the action of the micropore aeration device, the sewage can fully contact and react with microorganisms attached to the suspended filler device, the sewage treatment capacity is enhanced, a first air lifting device is arranged in the aerobic tank 6, optionally, the first air lifting device is arranged in the middle of the aerobic tank 6, the first air lifting device adopts a nitrifying liquid air lifting device, the nitrifying liquid air lifting device comprises an air lifting pipe and an air supply pipe, and the tail end of the nitrifying liquid air lifting device is connected with a return tank 1 and is communicated with the anoxic tank 2.

The upper and lower connecting pipes of the annular air cavity in the first air-lift device have the same diameter as the water lifting pipe and are connected with the upper and lower water lifting pipes by flanges. When the air distribution device operates, air enters the external annular air cavity, rectified compressed air passes through the air distribution small holes in the wall of the internal circular pipe and enters the water lifting pipe through the upper connecting pipe, the inner circular pipe and the upper and lower connecting pipes have the same diameter as the water lifting pipe, and the air distribution mode is that air is distributed along the side wall of the water lifting pipe; compressed air enters from the small air distribution holes on the side wall of the inner circular tube of the air distribution device, the air distribution direction points to the center of the tube from the tube wall, and the pressurized bubbles push the liquid to the center of the tube, so that the friction loss between the liquid and the tube wall is reduced; the pipe is in the same diameter with the pump head in the gas distribution device, and the pump head cross section is not taken up and is obtained make full use of by the gas distribution head, and the bubble can smoothly spread to in the pump head with sewage intensive mixing, has reduced the anti-excessive and leakage rate of bubble, has increased gas utilization ratio, because interior pipe and pump head isodiametric, the gas water misch bene can be followed the gas distribution device section to pump head section smooth transition, and energy loss is little, and the lifting efficiency is higher.

Specifically, the aerobic tank 6 is an MBBR aerobic tank 6, the suspended filler is an MBBR filler 5, the suspended filler is made of PE, the filler ratio is 40%, the aerobic tank 6 is communicated with the sedimentation tank 7 through a first water pipe, and a dosing and mixing device is arranged on the first water pipe and used for removing phosphorus. Optionally, a grating device 18 is arranged on the first water passing pipe, and the grating device 18 comprises a square grating for intercepting the MBBR filler 5 and preventing the MBBR filler 5 from entering the sedimentation tank 7.

Good oxygen pond 6 is through first water pipe and first mud pipe and sedimentation tank 7 intercommunication, adds medicine mixing arrangement and connects on good oxygen pond 6 leads to the first water pipe and the first cloth mud pipe of sedimentation tank 7, and first cloth mud pipe is the horizontal direction, and cloth mud that can be even alleviates sewage and gets into the impact force that sedimentation tank 7 produced the mud that subsides, strengthens sedimentation tank 7's precipitation effect.

A mud bucket and a mud discharging device are arranged in the sedimentation tank 7, a second air lifting device is arranged on the mud bucket, and the second air lifting device is connected with the reflux groove 1 so that sewage in the sedimentation tank 7 flows to the anoxic tank 2 through the reflux groove 1. The second air stripping device is vertically arranged in the mud bucket and is a sludge air stripping device, and the tail end of the sludge air stripping device is connected with the reflux tank 1 and communicated with the anoxic tank 2. The mud discharging device comprises a mud discharging pipe and an electromagnetic valve, the mud discharging pipe of the sedimentation tank 7 is a horizontal mud discharging pipe, the horizontal mud discharging pipe is arranged above the mud bucket of the sedimentation tank 7 by 200mm, the hole opening diameter of the mud discharging pipe is arranged at 40mm, holes are formed in the two sides of the mud bucket in an inclined mode of 45 degrees in an alternating mode, the distance is 100mm, the mud discharging mode is gravity mud discharging, and mud in the mud bucket is discharged through gravity. The sewage on 7 upper strata of sedimentation tank flows out through the drainage weir that 7 upper portions of sedimentation tank set up, and the drainage weir can the balanced sedimentation tank 7 velocity of water that goes out, and the other water catch bowl 8 that is equipped with of drainage weir, the play water end of water catch bowl 8 are equipped with the discharge orifice, and the discharge orifice is linked together with middle pond 9, and the sewage of sedimentation tank 7 flows into middle pond 9 through the discharge orifice.

The reflux tank 1 is arranged at the top of the anoxic tank 2, the anaerobic tank 4, the aerobic tank 6 and the sedimentation tank 7, and the first water passing pipe, the first gas stripping device and the second gas stripping device are respectively connected with the reflux tank 1 and communicated with the anoxic tank 2.

The filter tank 17 is internally provided with an effluent weir, a filter screen, a filter material layer and a pipeline component from top to bottom, the pipeline component comprises a water inlet pipe and a sludge discharge pipe, and the water inlet pipe is communicated with the intermediate tank 9.

The water inlet pipe and the sludge discharge pipe are arranged at the bottom of the filter tank 17, the filter material layer is arranged at the middle upper part of the filter tank 17, the thickness is generally 1.0-2.0 m, and the filter screen is arranged at the top of the filter material layer and used for preventing the loss of the filter material. An effluent weir is arranged at the upper part of the filter tank 17. The filter tank 17 is provided at the left with a clean water tank 16 serving as a storage area for backwash water, and the backwash start program thereof is determined according to the head height of the intermediate tank 9 and the system program.

The water inlet pipe is communicated with the intermediate tank 9 through a water distribution gallery, a filter plate is arranged on the water distribution gallery, and an aeration pipe and a plurality of water distribution holes are arranged on the filter plate; the perforation on the filter orifice plate is a water distribution hole with the diameter of 20mm, and the filter screen arranged at the top of the filter tank 17 can prevent the filter material from flowing out.

A backwashing pump 12 is arranged in the equipment tank 10, and in a first state, the backwashing pump 12 is used for conveying water in the intermediate tank 9 to the filtering tank 17; in the second state, the backwash pump 12 is used to convey the water in the clean water tank 16 to the filter tank 17 for backwashing. When the water head height of the intermediate tank 9 exceeds a set value, the backwashing pump 12 is started in a first state, and the backwashing pump 12 conveys water in the intermediate tank 9 to a water distribution gallery at the bottom of the filtering tank 17; when the backwash pump 12 is started in the second state, the backwash pump is set according to a system program controlled by the electric control cabinet 11, and the water in the clean water tank 16 is conveyed to a water distribution gallery of the filter tank 17 for backwash according to the system program setting, and the space between the filter material layer and the filter screen is reserved for expansion of the filter material during backwash regeneration. After the water in the filter tank 17 flows into the clean water tank 16, one part of the water is discharged out of the system, the other part of the water is used as backwashing water, the backwashing adopts air-water alternate backwashing, the backwashing direction is air-water cocurrent flow, the cocurrent flow can promote air distribution and water distribution to be uniform, suspended substances trapped at the bottom can be brought into the middle upper part in the rising process of air bubbles, the dirt receiving rate of filter materials is increased, the backwashing interval time is prolonged, and the transfer and utilization of oxygen are facilitated.

In addition, the filter tank 17 further comprises an overflow pipe, a blow-down pipe, a backwashing gas pipe, a backwashing water pipe, a backwashing liquid level meter, an electric ball valve and a polyurethane filter material, wherein the filter orifice plate is fixed at a height 400mm away from the bottom of the filter tank 17 through an angle iron, and the filter screen is fixed at a height 200mm below the water outlet weir. The vertical setting of backwash level gauge is at filtering ponds 17, the backwash trachea passes through the support to be fixed on the filter plate board, the electric ball valve sets up on the backwash trachea, blow-down pipe and backwash water pipe set up under the filter plate board, the mud pipe leads to the total pipe of 7 mud union couplings of sedimentation tank, backwash pump 12 is installed in equipment pond 10, and communicate with clean water basin 16 and middle pond 9, the electric ball valve, backwash level gauge and backwash pump 12 respectively with 11 electric connection of automatically controlled cabinet, guarantee that filtering ponds 17 can carry out incessant filtration in succession at the in-process of operation.

The specific operation mode is that sewage flows into the filter tank 17 from the bottom through the water inlet pipe, and flows into the filter tank 17 through the filter orifice plate uniformly, the aeration pipe is arranged on the filter orifice plate, during non-backwashing, the aeration pipe is used for distributing a small amount of gas, the sewage passes through the filter tank 17 to be removed with organic matters, ammonia nitrogen and suspended substances, and the effluent is discharged into the clean water tank 16 through the top of the clean water tank 16. The polyurethane suspension filter material is a carrier of a biological membrane, has the function of intercepting suspended substances, and can intercept and filter most suspended particles in water. During backwashing, the system closes the inlet valve earlier, the regulating valve opening of backwashing pipe is adjusted again, carry out the backwash of big tolerance, start the valve of backwash overflow pipe simultaneously, the valve of backwash pump 12 and clear water pond 16 pressure pipe, air water gets into filtering ponds 17 simultaneously, utilize air water shearing force release suspended solid of holding back and renew the biomembrane, backwashing water flows back into the mud district through backwash overflow pipe play water, when the backwash procedure finishes, open the valve of filtering ponds 17 blow-down pipe, make backwashing water in the short time instantaneous unloading, can drop the suspended substance attached to the filter material, prevent that it from remaining on the suspended packing. The clean water layer and the filter layer are separated by a separation net for preventing the loss of the suspended filler, and a certain space is arranged between the top of the filler layer and the bottom of the clean water tank 16 for expanding the filler during backwashing.

Therefore, the filtering tank 17 can remove suspended substances, nitrogen, phosphorus, organic matters and other pollutants in the water body through physical adsorption and interception and biodegradation. The sewage flows through the filter material layer, and pollutants in the water body are adsorbed by the filter material layer, intercepted and degraded and converted by microorganisms attached to the filter material, so that the purification of the water body is realized, and the sewage treatment effect is enhanced.

Be provided with degassing unit 13 and medicine bucket 15 in equipment pond 10, clean water basin 16 through first outlet pipe with degassing unit 13 is connected, degassing unit 13 is through second outlet pipe connection medicine bucket 15, medicine bucket 15 still with add medicine mixing arrangement and be linked together, realize water cyclic utilization

An electric control cabinet 11, an axial flow fan and a vortex fan 14 are arranged in the equipment tank 10, the vortex fan 14 is respectively connected with an intermittent aeration device in the anoxic tank 2, a micropore aeration device in the aerobic tank 6, a first air stripping device, a second air stripping device and a device for backwashing in the filter tank 17, and the electric control cabinet 11 is respectively connected with the vortex fan 14, the axial flow fan, a dosing device and a device for backwashing and discharging sludge.

The electric control cabinet 11 is an integrated electric control system, a liquid level meter of the middle pool 9 senses the liquid level and gives an electric system signal, and the electric control cabinet 11 controls the backwashing pump 12 to operate according to a program.

The electrical control system of the electric control cabinet 11 can also perform programmed regulation and control of each device in the system according to the water inlet quantity and the water quality, the first aeration device of the anoxic tank 2 is time-controlled, the start time is 2min, the stop time is 20min, the control mode of the second aeration device of the aerobic tank 6 is time-controlled, the intermittent aeration is performed on the premise that the aeration quantity provided in unit time can meet the current water quality, the aerobic tank 6 is enabled to alternately operate in an anoxic/aerobic environment, and meanwhile, the start time of the second aeration device of the aerobic tank 6 is synchronous with the start time of the first air-lift device and the second air-lift device.

The electric control system can realize electric manual and automatic switching, ensure that the system can automatically operate under normal conditions, and manually adjust and control when a fault occurs. The electrical system can realize the orderly control of the system, can set programs aiming at the condition of large rural sewage water quantity fluctuation, ensures the normal operation of the system, reduces energy consumption and can automatically alarm when equipment fails.

The intermediate tank 9 is communicated with the sedimentation tank 7 through a water collecting tank 8, the upper part of the intermediate tank 9 is provided with an overrunning pipe, the overrunning pipe is provided with a manual ball valve, the water outlet direction of the overrunning pipe is connected with a disinfection device 13, and the bottom of the intermediate tank 9 is communicated with a filter tank 17.

Sewage flows into the clean water tank 16 from the filter tank 17, water in the clean water tank 16 enters the disinfection device 13 of the equipment tank 10 through the water outlet pipe for disinfection and sterilization, the water outlet pipe of the disinfection device 13 is provided with a bypass water supply pipe, and the bypass water supply pipe is communicated with the dosing barrel 15 of the equipment tank 10, so that reclaimed water reuse can be realized, limited and precious freshwater resources can be effectively utilized and saved, the discharge amount of sewage and waste water can be reduced, and the pollution of a water environment is reduced. Optionally, the disinfection device 13 is an ultraviolet disinfection device 13.

The main treatment process of the utility model is that sewage is lifted by a lift pump, enters an anoxic tank 2 for denitrification treatment through a pipeline valve, a water inlet electromagnetic flow meter and a reflux tank 1, then enters an anaerobic tank 4 for degrading macromolecular organic matters and micromolecular organic matters in the sewage under the action of microorganisms, and then enters an aerobic tank 6 for removing various organic matters in the sewage; part of the mixed liquid is refluxed to the front end of the anoxic tank 2 at the tail end of the aerobic tank 6 in a gas stripping mode to be subjected to denitrification treatment; after the other part of the sewage in the aerobic tank 6 is treated, the sewage enters a sedimentation tank 7, sludge-water separation is carried out by utilizing the action of natural sedimentation, suspended matters in a mixed solution are gradually deposited in a mud bucket at the bottom of a box 19 through the action of natural sedimentation or flocculation sedimentation, meanwhile, total phosphorus in the sewage is removed through a dosing device, then uniform water distribution is carried out through a water distribution pipeline, one part of the sludge is refluxed to the front end of an anoxic tank 2 through air stripping, the other part of the residual sludge is sucked and discharged to a sludge storage area through a sludge discharge device for storage, the supernatant of the sedimentation tank 7 enters an intermediate tank 9 after being subjected to water inlet collection through a drainage weir trough, the sewage enters a filtering tank 17 from the bottom through a pipeline in a gravity flow mode through the intermediate tank 9, then the sewage is subjected to deep filtration treatment in the filtering tank 17, most suspended matters in the supernatant can be intercepted by filter cloth, the filtering material is in a stable filtering state under the normal working liquid level of the filtering tank 17, when the filtering speed in the filtering tank 17 gradually slows down, when the liquid level rises to reach a backwashing liquid level, the filtering material enters the next round of normal filtering working state after cleaning, the sludge deposited at the bottom is periodically removed by adopting a sludge discharge system; the sewage treated by the filtering tank 17 is collected by the effluent weir and enters the clean water tank 16, and the supernatant of the clean water tank 16 finally enters the sterilizing device 13 for sterilization and disinfection until the sewage reaches the standard and is discharged.

The utility model discloses inversion A- ² The biochemical unit, the sedimentation, the filtration, the disinfection and the equipment room of the O are effectively integrated into the box body 19, the occupied area is reduced, the chemical adding room and the equipment room of civil engineering are not needed, the investment cost is saved, and the situation of fund shortage of rural sewage projects is relieved. The anoxic tank 2, the anaerobic tank 4 and the aerobic tank 6 are an inverted A/2O coupled MBBR sludge-film mixing process, so that the sludge concentration can be effectively increased, and the volume of the equipment can be reduced; can well deal with the fluctuation of rural sewage water volume through the mode of increasing the packing filling rate. The anoxic tank 2 adopts an intermittent gas stirring mode, the sludge and the nitrifying liquid are refluxed in an air stripping mode, the operation effect can be ensured by controlling the intermittent aeration device, and compared with the conventional sewage treatment equipment, the anoxic tank saves a submersible stirrer, a sludge reflux pump and a nitrifying liquid reflux pump, and savesInvestment cost is reduced, the failure rate of equipment is reduced, the stability of the system is improved, and the operation energy consumption and the operation cost are lower.

The sewage treatment system provided by the application mainly aims at the treatment of rural sewage, and in the treatment of the rural sewage, the effluent does not pass through the filtering device, and the effluent hardly meets the first-level A standard of pollutant discharge standard of urban sewage treatment plants. And the filtering mode of the integrated sewage treatment equipment is usually MBR membrane filtration or sand filtration tank filtration. The MBR membrane has high manufacturing cost, high investment cost, easy occurrence of membrane pollution and high cleaning, maintenance and replacement cost. For the treatment of distributed rural sewage, the water inlet scale is often small, the ton water investment cost of sand filtration equipment is high, only one shallow level of filtration can be performed, no method is available for performing one depth of filtration on a water body, and filter media such as quartz sand are often heavy and fine in particles, the energy consumption in the backwashing process is high, and a filter pump and a backwashing pump need to be independently arranged, so that the cost is high.

And the sewage treatment system that this application provided, its whole equipment possesses that area is little, and sewage treatment is efficient, and degree of automation is high and be convenient for advantages such as maintain, can solve rural sewage treatment energy consumption too high, sewage treatment device maintenance cost is high and the distributed sewage's of villages and towns processing problem, goes out water and can stably satisfy "town sewage treatment plant pollutant discharge standard" primary A standard.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wastewater treatment system, comprising:

the interior of the box body (19) is divided into an anoxic tank (2), an anaerobic tank (4), an aerobic tank (6), a sedimentation tank (7), an intermediate tank (9), a filter tank (17), a clean water tank (16) and an equipment tank (10) which are communicated in sequence through a plurality of partition plates;

the reflux tank (1) is arranged in the box body (19), one end of the reflux tank (1) is communicated with sewage, the reflux tank (1) is communicated with the upper part of the anoxic tank (2) through a first through hole so that the sewage flows into the anoxic tank (2) from the upper part of the anoxic tank (2), and the sewage in the anoxic tank (2) flows to the anaerobic tank (4) through the bottom part of the anoxic tank (2); and

the first aeration device is arranged at the bottom of the anoxic tank (2).

2. Sewage treatment system according to claim 1, characterised in that a support frame is arranged in the anaerobic tank (4), on which support frame a filling device is arranged.

3. The sewage treatment system according to claim 1, wherein a suspended filler and a second aeration device are provided in the aerobic tank (6), and a first gas stripping device is further provided in the aerobic tank (6), and the first gas stripping device is connected to the reflux tank (1) so that the sewage in the aerobic tank (6) flows to the anoxic tank (2) through the reflux tank (1).

4. The sewage treatment system according to claim 1, wherein the aerobic tank (6) is communicated with the sedimentation tank (7) through a first water pipe, and a dosing and mixing device is arranged on the first water pipe.

5. The sewage treatment system according to claim 4, wherein a disinfection device (13) and a dosing barrel (15) are arranged in the equipment tank (10), the clean water tank (16) is connected with the disinfection device (13) through a first water outlet pipe, the disinfection device (13) is connected with the dosing barrel (15) through a second water outlet pipe, and the dosing barrel (15) is further communicated with the dosing mixing device.

6. Sewage treatment system according to claim 4, characterised in that said first conduit is provided with grating means (18).

7. The sewage treatment system according to claim 1, wherein a mud bucket and a mud discharging device are further arranged in the sedimentation tank (7), a second air lifting device is arranged on the mud bucket, and the second air lifting device is connected with the reflux tank (1) so that the sewage in the sedimentation tank (7) flows to the anoxic tank (2) through the reflux tank (1).

8. The sewage treatment system according to claim 1, wherein the filtering tank (17) is provided with an effluent weir, a filter screen, a filter material layer and a pipeline component from top to bottom, the pipeline component comprises a water inlet pipe and a sludge discharge pipe, and the water inlet pipe is communicated with the intermediate tank (9).

9. The sewage treatment system of claim 8, wherein the water inlet pipe is communicated with the intermediate tank (9) through a water distribution gallery, a filter plate is arranged on the water distribution gallery, and an aerator pipe and a plurality of water distribution holes are arranged on the filter plate.

10. Sewage treatment system according to claim 1, characterised in that a backwash pump (12) is arranged in the apparatus tank (10), said backwash pump (12) being adapted to convey water in the intermediate tank (9) to the filtration tank (17) in the first state; in the second state, the backwashing pump (12) is used for conveying the water in the clean water tank (16) to the filtering tank (17) for backwashing.