CN108975632A - A kind of integration distributing high-efficiency wastewater treatment system - Google Patents

Abstract

The invention discloses an integrated decentralized high-efficiency sewage treatment system. The sewage treatment system includes a first-level anoxic pool, an anaerobic pool, a second-level anoxic pool, an aerobic pool, and a sedimentation pool connected in sequence according to the sewage treatment direction. , clear water pool, and equipment room, filter, ultraviolet sterilizer and fan, high-efficiency phosphorus removal agent dosing device, sludge return mechanism, aerobic liquid return mechanism; the present invention utilizes the anaerobic ammonia oxidation To improve the nitrogen and phosphorus removal effect of the system, at the same time, add a certain amount of suspended carrier (MBBR filler) to the aerobic tank to increase the biomass and biological species in the aerobic tank, thereby improving the treatment efficiency of the reactor and improving the sewage The effect of denitrification and phosphorus removal reduces investment cost, reduces land occupation, increases operating load, and reduces operating costs. The final effluent reaches the first-class A standard or the standard for reclaimed water reuse, realizing the resource utilization of sewage.

Description

An integrated decentralized high-efficiency sewage treatment system

technical field

The invention relates to the field of sewage treatment, in particular to an integrated decentralized high-efficiency sewage treatment system.

Background technique

With the rapid development of my country's rural economy, the living standards of farmers have been greatly improved, but the construction of the rural environment is not in sync with economic development. Among them, the problem of water environmental pollution is particularly serious, and the discharge of various sewage/wastewater has increased significantly, seriously threatening the water environment. Untreated domestic sewage is discharged randomly, causing the water quality of ditches and ponds to turn black and smelly, and mosquitoes to breed, affecting the living environment in rural areas and threatening the health of residents. At the same time, it will cause pollution of drinking water sources and eutrophication of lakes and reservoirs .

In recent years, the technologies used in rural sewage treatment in various parts of my country include ecological technologies such as artificial wetlands, oxidation ponds, and stabilization ponds, and urban sewage technologies such as traditional activated sludge process and MBR process have been applied in rural areas of my country, but there are the following problems. Artificial Wetland, oxidation pond, and stabilization pond technologies have a small footprint, the system is easily affected by the weather, the treatment effect is unstable, and it cannot meet the requirements of Class A discharge standards. The traditional activated sludge process technology has disadvantages such as large land occupation, high infrastructure costs, sludge bulking, poor nitrogen and phosphorus removal effects, poor shock resistance and high requirements for operation and management. MBR process technology has disadvantages such as high investment cost, high maintenance cost of membrane modules, easy membrane pollution, and high management requirements. This has led to the existence of technical choices in many areas, which to a certain extent has affected the smooth implementation of rural sewage treatment in the local area. Therefore, combined with the characteristics of scattered distribution of domestic sewage in rural areas, complex terrain, imperfect pipe network coverage, and unstable water volume, it is not suitable for centralized treatment in urban sewage care plants, so a mobile, small footprint, and convenient treatment was developed. , Micro power, sewage resource and efficient integrated sewage treatment device have become the development trend of decentralized rural sewage treatment.

Contents of the invention

In order to solve the existing technical defects, the present invention provides an integrated decentralized high-efficiency sewage treatment system. Its specific technical scheme is as follows:

An integrated decentralized high-efficiency sewage treatment system, which includes sequentially connected primary anoxic pools, anaerobic pools, secondary anoxic pools, aerobic pools, sedimentation tanks, clear water pools, filters, and ultraviolet disinfection according to the direction of sewage treatment. The device also includes an equipment room. The filter and the ultraviolet sterilizer are all arranged in the equipment room; Filled with suspended fillers, an aeration device is provided at the bottom of the aerobic tank, and the aeration device includes an aeration tube and several aeration discs arranged on the aeration tube, and the aeration tube is connected with the equipment room The fan is connected; the aerobic liquid return mechanism is provided between the aerobic pool and the first-level anoxic pool and the second-level anoxic pool, and the aerobic liquid back-flow mechanism sends the aerobic return liquid into the first-level anoxic pool and the second-level anoxic pool. In the secondary anoxic tank, a sludge return mechanism is set between the sedimentation tank and the primary anoxic tank, and the sludge return mechanism sends the return sludge from the sedimentation tank into the primary anoxic tank; the equipment room also It includes a high-efficiency phosphorus removal agent dosing device, and the outlet of the high-efficiency phosphorus removal dosing device is located at the water inlet of the sedimentation tank.

Preferably, the aerobic liquid return mechanism includes a first air lift device and an aerobic liquid return pipe, and the first air lift device includes a first riser and a first air pipe, and the inlet of the first riser is set at a good Inside the oxygen pool, one end of the first air pipe communicates with the air pipe of the fan in the equipment room, and the other end communicates with the first riser, the outlet of the first riser communicates with the aerobic liquid return pipe, and the aerobic The outlet of the liquid return pipe communicates with the primary anoxic pool and the secondary anoxic pool.

Preferably, the sludge return mechanism includes a second airlift device and a sludge return pipe, and the second airlift device includes a second riser and a second air pipe; the second riser is arranged at the bottom of the sedimentation tank body, One end of the second air pipe is connected with the air pipe of the fan in the equipment room, and the other end is connected with the second riser pipe, the outlet of the second riser pipe is connected with the sludge return pipe, and the outlet of the sludge return pipe is connected with the first-stage hypoxia pipe. The pool is connected.

Preferably, the high-efficiency dephosphorization agent dosing device includes a dosing box, a metering pump, a dosing pipe and a sewage pipe arranged at the bottom of the dosing box, the dosing box contains a dephosphorization agent, and the dosing pipe The outlet is located at the inlet of the sedimentation tank.

Preferably, the body of the sedimentation tank is provided with inclined plates or inclined pipes and an outlet weir.

Preferably, the inclined plate or inclined tube of the sedimentation tank is 60° to the horizontal plane, and the net distance between the inclined plate or the inclined tube aperture is 80-100mm;

Preferably, a phosphorus removal agent is placed in the phosphorus removal dosing device, and the phosphorus removal agent is one of polyaluminum ferric chloride, polyaluminum chloride, aluminum sulfate, and polyferric sulfate. The dosage is 30ppm ~ 80ppm.

Preferably, the filling degree of the suspended filler in the aerobic tank is 30% to 70%; the suspended filler is one or more combinations of modified biological filler, foam filler, polyethylene filler and LEVAPOR suspended filler.

Preferably, the filter is a fully automatic cleaning filter and a hydraulically driven self-cleaning filter, and the diameter of the filter screen of the fully automatic cleaning filter and the hydraulically driven self-cleaning filter is 10-100 microns.

Preferably, both the water inlet and the water outlet of the aerobic pool are provided with grids.

Beneficial effects of the present invention: the present invention provides an intelligent, modularized and distributed integrated treatment system, which uses the anaerobic ammonium oxidation of the primary anoxic tank to improve the nitrogen and phosphorus removal effect of the system, At the same time, a certain amount of suspended carrier (MBBR filler) is added to the aerobic tank to increase the biomass and biological species in the aerobic tank, thereby improving the treatment efficiency of the reactor, improving the effect of nitrogen and phosphorus removal of sewage, reducing investment costs, Reduce floor space, increase operating load, and reduce operating costs. The final effluent reaches the first-class A standard or the standard for reclaimed water reuse, realizing the resource utilization of sewage. It solves the shortcomings of the traditional activated sludge method, such as large floor area, large infrastructure costs, sludge bulking, poor nitrogen and phosphorus removal effects, poor shock resistance and high operation and management requirements, and at the same time solves the high investment cost of MBR technology , Membrane module maintenance costs are high, membranes are easily polluted, and management requirements are high; and the technology of artificial wetlands, oxidation ponds, and stabilization ponds occupies a small area, the system is easily affected by the weather, the treatment effect is unstable, and it cannot reach Grade A Disadvantages such as emission standard requirements.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail, and these accompanying drawings all are simplified schematic diagrams, only illustrate basic structure of the present invention in schematic mode, and the direction of this specific implementation is standard with Fig. 1 direction.

The invention discloses an integrated decentralized high-efficiency sewage treatment system. The sewage treatment system includes a first-level anoxic pool 1, an anaerobic pool 2, a second-level anoxic pool 3, and an aerobic pool connected in sequence according to the direction of sewage treatment. 4. Sedimentation tank 5, clean water tank 100, filter 7, ultraviolet sterilizer 8; filter 7, ultraviolet sterilizer 8 are arranged in equipment room 6, and equipment room 6 is also provided with water pump 102, blower fan 9, high-efficiency phosphorus removal agent throwing The sewage treatment system also includes a sludge return mechanism that returns part of the sludge in the sedimentation tank to the first-level anoxic tank and returns the aerobic solution in the aerobic tank to the first-level anoxic tank and the second-level anoxic tank. Aerobic liquid return mechanism in the pool.

Sewage enters 10% to 30% of the raw water through the sewage pipe 10 to the first-level anoxic pool 1, and at the same time uses the sedimentation tank 5 to return the sludge and the aerobic backflow mixture from the aerobic pool 4 to enter the first-level anoxic pool 1, and the first-level anoxic pool 1. Anammox in the anoxic tank 1, the anammox bacteria use NH ₄ ⁺ in the sewage as the electron donor, use the NO ₃ ^- and NO ₂ ^- electron acceptors in the reflux mixture in the aerobic tank 4, and convert the ammonia Finally, it is transformed into N ₂ escaping, which strengthens the biological denitrification of the system. At the same time, the anaerobic ammonium oxidation reduces the concentration of a large amount of nitrate nitrogen carried in the return sludge, which is conducive to the release of phosphorus-accumulating bacteria in anaerobic ponds, and also contributes to Improve the removal effect of system TP and remove organic matter at the same time.

The effluent from the primary anoxic tank 1 is completely mixed with 70% to 90% of the sewage entering the anaerobic tank 2. Under the condition of low dissolved oxygen, phosphorus-accumulating microorganisms (phosphorus-accumulating bacteria, etc.) in the anaerobic tank 2 release phosphorus, making the The concentration of P in the sewage increases, and the dissolved organic matter is absorbed by the microbial cells to reduce the concentration of BOD in the sewage; in addition, part of the NH3-N is removed due to the synthesis of the cells, so that the concentration of NH3-N in the sewage decreases.

The effluent from the anaerobic tank 2 and the reflux mixture from the aerobic tank 4 are mixed into the secondary anoxic tank 3. The denitrifying bacteria in the secondary anoxic tank 3 use the organic matter in the sewage as a carbon source, and NO ₃ ^- and NO ₂ ^- as electrons. acceptors, reducing NO ₃ ^- and NO ₂ ^- into N ₂ and releasing them for denitrification. On the one hand, it greatly reduces the amount of TN, and on the other hand, it also reduces the sewage load, which is beneficial to the subsequent aerobic zone. Nitrification reaction, thereby improving the denitrification effect of the whole system.

Wherein, the one-level anoxic tank 1, the anaerobic tank 2 and the secondary anoxic tank 3 are suspended with combined packing 11 respectively, and the structure of the described combined packing is that a plurality of plastic rings are fixed on a central rope, and then the Aldehyde fibers or polyester filaments are pressed on the ring of the ring to make the fiber bundles evenly distributed; the inner ring is a snowflake-like plastic branch; A flow pusher 12 is fixedly installed, and under the action of the flow pusher 12, the sewage circulates multiple times in multiple pools.

The effluent of the secondary anoxic tank 3 flows into the aerobic tank 4, and the aerobic tank 4 is filled with a suspended filler 41, and the filling degree of the suspended filler in the aerobic tank is 30% to 70%; the suspended filler is a modified biological filler, One or more combination of foam filler, polyethylene filler and LEVAPOR suspension filler. Add a certain amount of suspended carrier (MBBR filler) to the aerobic tank to increase the biomass and biological species in the aerobic tank, thereby improving the treatment efficiency of the reactor and improving the effect of denitrification and phosphorus removal of sewage. In the aerobic tank 4 The water inlet and the water outlet of the water inlet are all designed with a grid 42 to prevent the loss of suspended filler in the aerobic tank; Several aeration disks 44 on the aeration pipe 43, the aeration disk 44 is connected with the aeration pipe 43, the aeration pipe 43 is connected with the blower fan 9 in the equipment room 6, and the blower fan 9 provides air.

The effluent of the aerobic tank 4 flows into the sedimentation tank 5, and the sedimentation tank 5 includes a sedimentation tank body 51, a conical sludge bucket 52 and a sludge pipe 53 connected with the conical sludge bucket 52, and the sedimentation tank body 51 is provided with a slope Plate 54, water outlet weir 55, and a sloping plate 54 is set in the sedimentation tank 5, so that the suspended impurities in the water are precipitated in the sloping plate 54, the water rises and flows along the sloping plate, and the separated sludge slides down along the sloping plate under the action of gravity To the bottom of the pool and then into the conical sludge bucket, and then concentrated discharge. The inclined plate 54 of the present invention can also be set as an inclined tube; the setting of the inclined plate 54 shortens the settling time; improves the settling efficiency; improves the processing capacity. Preferably, the inclined plate (pipe) of the sedimentation tank 5 forms an angle of 60° with the horizontal plane, and the clear distance between the inclined plate (or the aperture of the inclined tube) is generally 80-100mm;

Part of the sludge in the sedimentation tank 5 flows back to the primary anoxic tank 1, the clear water effluent from the sedimentation tank flows into the clear water tank 100, and the effluent from the clear water tank 100 is transported to the filter 7 through the water pump 102, and the filter 7 is preferentially fully automatic cleaning and filtering The device and the hydraulically driven self-cleaning filter adopt commercially available general products. Preferably, the diameter of the filter screen of the fully automatic cleaning filter and the hydraulically driven self-cleaning filter is 10-100 microns. Filter 7 can remove SS in water quality, guarantees that effluent SS is less than 7mg/l, and the effluent of filter 7 flows to ultraviolet sterilizer and carries out sterilization, and the effluent of final ultraviolet sterilizer is discharged up to standard by outlet pipe.

The high-efficiency dephosphorization agent dosing device includes a dosing box 61, a metering pump 62, and a dosing pipe 63. The dosing box 61 contains a dephosphorization agent, which is polyaluminum ferric chloride, polyaluminum chloride, aluminum sulfate, One of the polymeric ferric sulfates, the dosage of quantitative dephosphorization agent is prepared by metering pump 62, and the dosage of dephosphorization agent is 30ppm-80ppm; the outlet of dosing pipe 63 is located at the water inlet of sedimentation tank 5, and the dosage is The pump 62 accurately sends the dephosphorization agent to the water inlet of the sedimentation tank, and adds high-efficiency phosphorus removal agent to the water inlet of the sedimentation tank to improve the mud-water separation effect of the sedimentation tank and improve the phosphorus removal effect.

The clear water filtered by the filter 7 flows into the ultraviolet sterilizer 8 through the outlet pipe for sterilization, and the sewage is discharged through the sewage pipe 71 at the bottom of the filter 7, and the outlet water of the final ultraviolet sterilizer is discharged through the outlet pipe up to standard. The ultraviolet sterilizer 8 of the present invention adopts commercially available general products.

The fan 9 is connected with the air pipe 91, and the air pipe 91 is divided into three branches, which are respectively the first air pipe 911, the second air pipe 912, and the third air pipe 913; wherein, the third air pipe 913 is connected with the aeration pipe 43, and the aeration pipe is supplied by the fan. 42 provides air.

The aerobic liquid reflux mechanism includes a first air lift device and an aerobic liquid return pipe 45, and the first air lift device includes a first riser 46 and a first air pipe 911, and the first riser 46 inlet is arranged inside the aerobic tank 4, The first air pipe 911 is communicated with the first riser 46, and the outlet of the first riser 46 is communicated with the aerobic liquid return pipe 45, and the outlet of the aerobic liquid return pipe 45 is connected with the first-level anoxic tank 1 and the second-level anoxic tank 3 The air is sent into the first air pipe 911 through the fan 9, and then the air is sent into the first riser 46 by the first air pipe 911, so that the aerobic liquid in the aerobic tank can be transported by the aerobic return pipe 45 To the primary anoxic tank 1 and the secondary anoxic tank 3, thereby forming aerobic tank sludge backflow. Preferably, the reflux ratio of the aerobic tank sludge reflux liquid is 150% to 300%;

The sludge return mechanism includes a second air lift device and a sludge return pipe 56, and the second air lift device includes a second riser 57 and a second air pipe 912; the second riser 57 is arranged at the bottom of the sedimentation tank 5, and the second The air pipe 912 communicates with the second riser pipe 57, the outlet of the second riser pipe 57 communicates with the sludge return pipe 56, the outlet of the sludge return pipe 56 communicates with the first-stage anoxic tank 1, and the air is sent to the first stage by the fan 9. In the second air pipe 912, the air is sent into the second riser 57 by the second air pipe 912, so that the sludge in the sedimentation tank can be transported to the primary anoxic tank 1 by the sludge return pipe 56, thereby forming a sediment Pool sludge backflow. Preferably, the reflux ratio of the sludge reflux in the sedimentation tank is 50% to 200%;

The equipment room also includes an electric control device 101, which provides electric energy for the system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (10)

1. An integrated decentralized high-efficiency sewage treatment system is characterized in that, according to the direction of sewage treatment, it includes a first-level anoxic pond, an anaerobic pond, a secondary anoxic pond, an aerobic pond, a sedimentation pond, and a clean water pond , filter, ultraviolet sterilizer, also includes equipment room, and described filter, ultraviolet sterilizer are all arranged in the equipment room; Described primary anoxic pool, anaerobic pool, secondary anoxic pool are all suspended with combined packing , the aerobic tank is filled with suspended fillers, an aeration device is provided at the bottom of the aerobic tank, and the aeration device includes an aeration tube and several aeration discs arranged on the aeration tube, the aeration The trachea is connected to the fan in the equipment room; an aerobic liquid return mechanism is set between the aerobic pool, the first anoxic pool, and the second anoxic pool, and the aerobic liquid return mechanism sends the aerobic return liquid into the In the first-level anoxic tank and the second-level anoxic tank, a sludge return mechanism is set between the sedimentation tank and the first-level anoxic tank, and the sludge return mechanism sends the return sludge from the sedimentation tank to the first-level anoxic tank The equipment room also includes a high-efficiency phosphorus removal dosing device, and the outlet of the high-efficiency phosphorus removal dosing device is located at the water inlet of the sedimentation tank. 2. The integrated decentralized high-efficiency sewage treatment system according to claim 1, wherein the aerobic liquid return mechanism includes a first air lift device and an aerobic liquid return pipe, and the first air lift device includes The first riser and the first air pipe, the inlet of the first riser is arranged inside the aerobic tank, one end of the first air pipe communicates with the air pipe of the fan in the equipment room, and the other end communicates with the first riser, so The outlet of the first riser is communicated with the aerobic liquid return pipe, and the outlet of the aerobic liquid return pipe is communicated with the primary anoxic pool and the secondary anoxic pool. 3. The integrated decentralized high-efficiency sewage treatment system according to claim 1, wherein the sludge return mechanism includes a second air lift device and a sludge return pipe, and the second air lift device includes a second air lift device. Riser, the second air pipe; the second riser is arranged at the bottom of the sedimentation tank body, one end of the second air pipe communicates with the air pipe of the fan in the equipment room, and the other end communicates with the second riser, the second riser The outlet is connected with the sludge return pipe, and the outlet of the sludge return pipe is connected with the first-stage anoxic tank. 4. The integrated decentralized high-efficiency sewage treatment system according to claim 1, characterized in that, the high-efficiency dephosphorization agent dosing device includes a dosing box, a metering pump, a dosing pipe, and a bottom of the dosing box Sewage pipe, the dosing box contains phosphorus removal agent, and the outlet of the dosing pipe is located at the water inlet of the sedimentation tank. 5. The integrated decentralized high-efficiency sewage treatment system according to claim 1, characterized in that, the body of the sedimentation tank is provided with inclined plates or inclined pipes, and an outlet weir. 6. The integrated decentralized high-efficiency sewage treatment system according to claim 5, characterized in that, the inclined plate or inclined tube of the sedimentation tank is 60° from the horizontal plane, and the net distance between the inclined plate or the inclined tube has an aperture of 80° ~100mm. 7. The integrated decentralized high-efficiency sewage treatment system according to claim 5, characterized in that, a phosphorus removal agent is placed in the phosphorus removal dosing device, and the phosphorus removal agent is polyaluminum ferric chloride, polychloride One of aluminum chloride, aluminum sulfate, and polyferric sulfate, and the dosage of the dephosphorization agent is 30ppm-80ppm. 8. The integrated decentralized high-efficiency sewage treatment system according to claim 1, wherein the filling degree of the suspended filler in the aerobic tank is 30% to 70%; the suspended filler is a modified biological filler, foam One or more combinations of fillers, polyethylene fillers and LEVAPOR suspension fillers. 9. The integrated decentralized high-efficiency sewage treatment system according to claim 1, characterized in that, the filter is a fully automatic cleaning filter, a hydraulically driven self-cleaning filter, and the fully automatic cleaning filter, water conservancy The diameter of the filter screen driving the self-cleaning filter is 10-100 microns. 10. The integrated decentralized high-efficiency sewage treatment system according to claim 1, wherein the water inlet and water outlet of the aerobic pool are both provided with grids.