Water treatment tank and mud-membrane coupling nitrogen and phosphorus removal integrated sewage treatment device

Abstract

The invention discloses a water treatment tank and a sludge-membrane coupling nitrogen and phosphorus removal integrated sewage treatment device, and belongs to the technical field of sewage treatment. Suspended filler is arranged in the water treatment pond, an overflowing area is arranged in the water treatment pond and is an area defined by a pore plate, holes are formed in the pore plate, the diameter of the holes is smaller than that of the suspended filler, the suspended filler is isolated outside the overflowing area through the holes, a water passing hole is formed in one side of the overflowing area, and the water passing hole is communicated with the overflowing area. And water in the water treatment tank flows into the next-stage tank through the water passing hole. According to the sludge-membrane coupled nitrogen and phosphorus removal integrated sewage treatment device disclosed by the invention, the water treatment tank is used as an aerobic nitrification sludge-membrane tank, the overflowing region is used as a nitrification liquid backflow region, and a plurality of water passing holes for water to pass through are formed in the tank surface of the nitrification liquid backflow region, so that the problem that suspended filler is easy to block between the aerobic nitrification sludge-membrane tank and the sedimentation tank is effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to a sewage treatment device integrating nitrogen removal and phosphorus removal by coupling a water treatment tank and a mud membrane. Background Art

[0002] At present, for rural sewage treatment equipment, suspended fillers are generally provided in aerobic nitrification mud membrane pools, and a water hole is opened between the aerobic nitrification mud membrane pool and the sedimentation tank, and the suspended fillers are used as carriers for the growth of microorganisms. However, during operation, the suspended fillers are easily blocked in the water passage from the aerobic nitrification mud membrane pool to the sedimentation tank under the action of water flow thrust, resulting in rising water levels. Eventually, the suspended fillers will fill the entire equipment and even overflow from the top. Moreover, due to the inclined pipe in the pool, the suspended fillers are difficult to salvage. When salvaging, the inclined pipe must be removed first, and then the suspended fillers are salvaged. The project is large in workload, time-consuming and labor-intensive, and the water outage time is long, affecting normal operation.

[0003] After searching, patent CN108585197A discloses a village-level mud-film coupling sewage treatment system and its treatment method, including an inlet pipe, a water distribution channel, a vortex flow anoxic / anaerobic mud-film coupling reaction zone, a spiral flow aerobic mud-film coupling reaction zone, an aerobic phosphate-absorbing mud-film aggregation zone, an aeration system, a mud-water separation and filtration zone, an outlet channel, a micro-powered airlift external mud discharge system, a micro-powered airlift mud-film circulation system, and a sludge resuspension and biofilm re-renewal system. The spiral flow aerobic mud-film coupling reaction zone is filled with suspended biofilm carriers, biofilms and activated sludge.

[0004] Patent CN219194745U discloses an integrated sewage treatment device, including a box and an anaerobic tank, an anoxic tank, an aerobic MBBR tank, a sedimentation tank, a floating filter tank and an equipment room arranged in the box, wherein the anaerobic tank, the anoxic tank, the aerobic MBBR tank, the sedimentation tank and the floating filter tank are connected in sequence, the box is provided with a water inlet pipe corresponding to the anaerobic tank, the anaerobic tank and the anoxic tank are both provided with a stirring system, the aerobic MBBR tank is provided with an aeration system, the sedimentation tank is provided with a water collection tank, the corresponding water collection tank is provided with a drain pipe, the drain pipe leads to the bottom of the floating filter tank, the bottom of the floating filter tank is provided with an air washing pipeline, and the equipment room is provided with a fan, which is connected to the air washing pipeline. The patent adds suspended filler in the aerobic MBBR tank, and flows into the sedimentation tank through the interception screen, but the suspended filler is easily accumulated at the water hole under the impact of the water flow, further accelerating the water flow, resulting in the suspended filler being unable to disperse under a large water pressure, blocking the water hole.

[0005] The above equipments all have the problem that the suspended filler is prone to clogging. Summary of the invention

[0006] 1. Problem to be solved

[0007] In view of the problem that the suspended fillers in the existing sewage treatment equipment are prone to clogging, the first purpose of the present invention is to provide a water treatment pool, which embeds a flow area in the pool so that the water in the water treatment pool flows into the next level pool through the water hole, effectively preventing the suspended fillers from being gathered at the water hole by water pressure, resulting in siltation of the suspended fillers;

[0008] The second object of the present invention is to provide a mud membrane coupled denitrification and phosphorus removal integrated sewage treatment device, which can effectively avoid the clogging of suspended fillers and ensure the normal operation of the equipment by providing a nitrification liquid reflux zone in the aerobic nitrification mud membrane pool.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0011] The present invention discloses a water treatment pool, in which suspended fillers are filled. In order to prevent the suspended fillers from being blocked in the water treatment pool, a flow zone is provided in the water treatment pool. The flow zone is an area surrounded by a perforated plate. A hole is provided on the perforated plate, and the diameter of the hole is smaller than the diameter of the suspended fillers. The hole isolates the suspended fillers outside the flow zone. A water hole is provided on one side of the flow zone, so that water in the water treatment pool flows into a pool of the next level through the water hole.

[0012] The flow zone is surrounded by a perforated plate with certain holes, the diameter of the holes is smaller than the diameter of the suspended filler, and the density of the holes makes the water flow rate through the flow zone less than 0.1m / s, preventing the suspended filler from being gathered in the water hole by water pressure, causing siltation of the suspended filler.

[0013] Furthermore, a reflux pump is provided in the flow zone to separate the reflux pump from the suspended filler to prevent the reflux pump from being blocked by the suspended filler.

[0014] An aerodynamic mixing and flocculation zone is provided behind the flow zone, and the aerodynamic mixing and flocculation zone is connected with the flow zone through a water hole. A dosing pipe is introduced into the aerodynamic mixing and flocculation zone, and the dosing pipe is connected to the dosing unit for introducing agents, wherein the outlet of the dosing pipe is located at the rear end of the water hole, and the agents are mixed by the impact of the water flow state flowing out of the water hole. Furthermore, a coagulation gas stirring pipe is introduced into the aerodynamic mixing and flocculation zone, and the coagulation gas stirring pipe is connected to the fan for introducing air, and the coagulation gas stirring pipe is vertically arranged with the dosing pipe, wherein the air outlet section of the coagulation gas stirring pipe is arranged opposite to the outlet of the dosing pipe, and the air outlet of the coagulation gas stirring pipe is located near the outlet of the dosing pipe and is evenly distributed in the aerodynamic mixing and flocculation zone, so that the gas ejected from the air outlet is in opposite directions to the agent dripped in the dosing pipe, and the gas is used to form an airflow impact on the dosing pipe to promote the full mixing of the agent and the wastewater, thereby further ensuring the full mixing and flocculation of the agent.

[0015] Furthermore, an over-liquid level alarm device is provided in the water treatment pool to avoid abnormal liquid level and overflow.

[0016] A mud membrane coupled denitrification and phosphorus removal integrated sewage treatment device comprises a deoxygenation and denitrification mud membrane pool, a pure anaerobic phosphorus release mud pool, an anoxic denitrification mud membrane pool, an aerobic carbon removal and phosphorus absorption mud membrane pool, an aerobic nitrification mud membrane pool, a sedimentation tank and a filtration tank which are sequentially connected along the water flow direction, wherein the water treatment pool is used as an aerobic nitrification mud membrane pool, the flow zone is used as a nitrification liquid reflux zone, the side plates and the bottom plate of the nitrification liquid reflux zone are both composed of orifice plates, the opening diameter is smaller than the filler diameter, and the through-hole flow rate is ensured to be less than 0.1 m / s, so as to solve the problem that the suspended filler is easily blocked between the aerobic nitrification mud membrane pool and the sedimentation tank; an aerodynamic mixing flocculation zone is arranged behind the nitrification liquid reflux zone, so as to realize rapid mixing of reagents and water as the power.

[0017] A flocculation pre-sedimentation zone is provided between the aerodynamic mixing flocculation zone and the sedimentation tank. The effluent from the aerodynamic mixing flocculation zone first passes through the flocculation pre-sedimentation zone and then flows into the sedimentation tank.

[0018] The side of the flocculation pre-sedimentation zone is provided with a baffle, and the baffle is provided with mutually staggered inclined plates. The inclined plates are provided with water-passing strip holes to prevent floc deposition, so that the wastewater passes through the inclined plates to form turbulence, and the effluent enters the sedimentation tank for further sedimentation. The inclined tube is preferably in the shape of honeycomb coal.

[0019] A water distribution component is provided on the partition between the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone. Water enters the flocculation pre-sedimentation zone through the water distribution component and is then connected to the sedimentation tank from the lower end of the flocculation pre-sedimentation zone.

[0020] The water distribution assembly comprises a water distribution plate, and the water distribution plate is horizontally provided with a long water passage hole.

[0021] Furthermore, in order to achieve uniform water distribution in the case of an uneven foundation, an adjustable weir plate is provided at the rear end of the long water hole of the water distribution plate, and a waist hole is opened on the adjustable weir plate. The adjustable weir plate and the water distribution plate are connected by bolts, and the bolts pass through the waist hole to connect with the water distribution plate.

[0022] A plurality of inclined tube fillers are arranged in the sedimentation tank, and the inclined tube fillers are used for rapid mud-water separation.

[0023] Furthermore, an air washing pipe is provided below the inclined tube to automatically clean the inclined tube periodically.

[0024] The mud membrane coupled denitrification and phosphorus removal sewage treatment device of the present application can be used to treat rural sewage with high nitrogen and phosphorus and low carbon-nitrogen ratio under low temperature (<15°C) conditions, and achieve all effluent indicators reaching the national standard Class A emission standard.

[0025] Furthermore, a reflux pump is provided in the nitrification liquid reflux zone, the reflux pump is connected to the nitrification liquid reflux pipe, the nitrification liquid reflux pipe is connected to the anoxic denitrification mud membrane pool, and is used to lift the water in the nitrification liquid reflux zone to the anoxic denitrification mud membrane pool.

[0026] The aeration unit includes a fan, which is respectively connected to a sludge gas stirring pipe, a coagulation gas stirring pipe and an air washing pipe. The sludge gas stirring pipe is sequentially connected to a deoxygenation and denitrification mud membrane pool, a pure anaerobic phosphorus release mud pool, an anoxic denitrification mud membrane pool, an aerobic carbon removal and phosphorus absorption mud membrane pool and an aerobic nitrification mud membrane pool. The coagulation gas stirring pipe is connected to an aerodynamic mixing and flocculation zone. The air washing pipe is connected to a sedimentation tank and an air washing regeneration filter pool.

[0027] Furthermore, the number of openings of the sludge gas stirring pipe in the deoxygenation and denitrification sludge membrane tank is greater than that in the pure anaerobic phosphate release sludge tank, so as to ensure that the dissolved oxygen content in the pure anaerobic phosphate release sludge tank is lower under stirring within the average area; the opening size of the pure anaerobic phosphate release sludge tank is greater than the opening size in the deoxygenation and denitrification sludge membrane tank, so as to ensure that the bubbles entering the pure anaerobic phosphate release sludge tank are larger and less likely to dissolve in water, causing the oxygen content of the pure anaerobic phosphate release sludge tank to increase.

[0028] Furthermore, the air washing regeneration filter tank is located at the rear end of the sedimentation tank, and the air washing regeneration filter tank includes a lightweight porous suspended filter material and an air washing pipe. The air washing pipe passes under the suspended filter material. The suspended filter material is respectively provided with limit orifice plates above and below, and the suspended filter material is fixed in the filter tank through the upper and lower limit orifice plates.

[0029] Furthermore, the mud membrane coupled denitrification and phosphorus removal sewage treatment device also includes an equipment room, which is equipped with a fan, a dosing unit, an aeration unit and a disinfection unit. The disinfection unit is arranged at the outlet of the filter tank, and the effluent is disinfected by the disinfection unit before being discharged.

[0030] 3. Beneficial effects

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The water treatment pool of the present invention is provided with an embedded flow zone in the pool, and a plurality of holes for water to pass through are provided on the surface of the flow zone, the holes isolate the suspended filler outside the flow zone, and a water hole is provided on one side of the flow zone, so that the water in the water treatment pool flows into the next level pool through the water hole. The total area of ​​the orifice plate of the embedded flow zone is large, which effectively reduces the flow velocity through the holes of the flow zone, so that the flow velocity through the holes is less than 0.1 m / s, which can effectively prevent the suspended filler from being gathered at the water hole by water pressure, causing siltation;

[0033] (2) The water treatment pool of the present invention utilizes the water flow state impact from the water hole to perform preliminary mixing of the reagent, promote the reaction between the reagent and the wastewater, and limit the mixing process of the reagent to the aerodynamic mixing flocculation zone, replacing the traditional mechanical stirring, which can save investment, energy consumption and operation and maintenance costs;

[0034] (3) The water treatment pool of the present invention is provided with a coagulation gas stirring pipe arranged opposite to the dosing pipe in the aerodynamic mixing and flocculation zone, and the gas outlet of the coagulation gas stirring pipe is located at the outlet of the dosing pipe and is evenly distributed in the aerodynamic mixing and flocculation zone, so that the gas ejected from the gas outlet forms an air flow impact on the agent flowing out of the dosing pipe, thereby promoting the full mixing of the agent and the wastewater;

[0035] (4) The mud membrane coupled denitrification and phosphorus removal sewage treatment device of the present invention has a flocculation pre-sedimentation zone between the aerodynamic mixing flocculation zone and the sedimentation tank. The effluent from the aerodynamic mixing flocculation zone first passes through the flocculation pre-sedimentation zone and then flows into the sedimentation tank, realizing the "bottom-in and top-out" and "top-out and bottom-in" of the water flow, increasing the reaction path and improving the treatment capacity;

[0036] (5) The mud membrane coupled denitrification and phosphorus removal sewage treatment device of the present invention has a water distribution assembly for water flow passing above the partitions of the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone, which is used to pass water flow from the top of the sedimentation tank. A baffle is provided in the sedimentation tank to form a flocculation pre-sedimentation zone. The water flow passes through the flocculation pre-sedimentation zone so that the water flow flows into the sedimentation tank from below;

[0037] (6) The mud membrane coupled denitrification and phosphorus removal sewage treatment device of the present invention has a water distribution component on the partition between the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone, and water enters the flocculation pre-sedimentation zone through the water distribution component. By adding an adjustable weir plate, the water flow through the water tunnel is adjusted so that the water flow through each water tunnel is the same;

[0038] (7) The number of openings of the sludge gas stirring pipe in the deoxygenation and denitrification mud membrane pool of the present invention is greater than that in the pure anaerobic phosphate release mud pool, so as to ensure that the dissolved oxygen content in the pure anaerobic phosphate release mud pool under stirring is lower within the average area; the opening size of the pure anaerobic phosphate release mud pool is larger than the opening size in the deoxygenation and denitrification mud membrane pool, so as to ensure that the bubbles entering the pure anaerobic phosphate release mud pool are larger, and the large bubbles are less likely to dissolve in water, causing the oxygen content of the pure anaerobic phosphate release mud pool to increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0040] Figure 1It is a plan view of the mud membrane coupled denitrification and dephosphorization sewage treatment device for preventing the suspended filler from clogging according to the present invention;

[0041] Figure 2 It is a cross-sectional view of a mud membrane coupled denitrification and dephosphorization sewage treatment device for preventing suspended filler clogging according to the present invention;

[0042] Figure 3 It is a plan layout diagram of the deoxidation and denitrification mud membrane pool and the pure anaerobic phosphorus release mud pool of the present invention;

[0043] Figure 4 It is a top view of the aerobic nitrification mud membrane tank, the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone of the present invention;

[0044] Figure 5 It is a cross-sectional view of the aerobic nitrification mud membrane tank, the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone of the present invention;

[0045] Figure 6 This is an enlarged view of the orifice plate in the nitrification liquid reflux zone of the present invention;

[0046] Figure 7 It is a cross-sectional view of the nitration liquid reflux area and the water passage hole of the present invention;

[0047] Figure 8 It is a cross-sectional view of the water distribution assembly of the present invention;

[0048] Fig. 9 It is a top view of the aerodynamic mixing flocculation zone and the flocculation pre-sedimentation zone of the present invention;

[0049] Fig.10 It is a cross-sectional view of the flocculation pre-sedimentation zone of the present invention;

[0050] In the figure:

[0051] 1. Deoxygenation and denitrification mud membrane pool; 2. Pure anaerobic phosphorus release mud pool; 3. Anoxic denitrification mud membrane pool; 4. Aerobic carbon removal and phosphorus absorption mud membrane pool; 5. Aerobic nitrification mud membrane pool; 51. Nitrification liquid reflux area; 511. Nitrification liquid reflux pipe; 512. Reflux pump; 513. Water tunnel; 52. Over-liquid level alarm device; 6. Sedimentation tank; 61. Aerodynamic mixing flocculation area; 611. Water distribution component; 6 12. Water distribution plate; 613. Adjustable weir plate; 614. Waist hole; 615. Bolt; 62. Flocculation pre-sedimentation area; 621. Baffle; 622. Inclined plate; 63. Inclined tube filler; 7. Filter tank; 71. Limiting orifice plate; 81. Dosing tank; 82. Dosing pipe; 91. Fan; 92. Sludge gas stirring pipe; 93. Coagulation gas stirring pipe; 94. Air washing pipe; 10. Ultraviolet disinfection unit. DETAILED DESCRIPTION

[0052] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments of the present invention that can be implemented are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be implemented and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is only for the purpose of illustrating and not limiting the description of the characteristics and features of the present invention, so as to propose the best mode for performing the present invention and to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

[0053] It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms "parallel" and "perpendicular" are not limited to their strict geometric definitions, but include tolerances for reasonable and inconsistent machining or human errors.

[0054] The following is combined with Figures 1 to 10 , a detailed description is given of the mud membrane coupled denitrification and dephosphorization sewage treatment device for preventing the clogging of suspended fillers of the present invention:

[0055] Example

[0056] A mud membrane coupled denitrification and dephosphorization sewage treatment device which is resistant to clogging of suspended fillers, the sewage treatment device comprises a deoxygenation and denitrification mud membrane pool 1, a pure anaerobic phosphorus release mud pool 2, an anoxic denitrification mud membrane pool 3, an aerobic carbon removal and phosphorus absorption mud membrane pool 4, an aerobic nitrification mud membrane pool 5, a sedimentation pool 6 and an air washing regeneration filter pool 7 which are connected in sequence according to the flow direction of water.

[0057] The mud membrane coupled denitrification and phosphorus removal sewage treatment device is provided with an aeration unit, which includes a fan 91, and the fan 91 is respectively connected to a sludge gas stirring pipe 92, a coagulation gas stirring pipe 93 and an air washing pipe 94. The sludge gas stirring pipe 92 passes through the deoxygenation and denitrification mud membrane pool 1, the pure anaerobic phosphorus release mud pool 2, the anoxic denitrification mud membrane pool 3 and the aerobic carbon removal and phosphorus absorption mud membrane pool 4 in sequence.

[0058] Since deoxygenation and denitrification are anoxic processes, a certain amount of oxygen needs to be introduced. Therefore, the number of openings of the sludge gas stirring pipe 92 in the deoxygenation and denitrification sludge membrane tank 1 is greater than that of the sludge gas stirring pipe 92 in the pure anaerobic phosphorus release sludge tank 2, and the hole size of the sludge gas stirring pipe 92 in the deoxygenation and denitrification sludge membrane tank 1 is smaller than that of the sludge gas stirring pipe 92 in the pure anaerobic phosphorus release sludge tank 2, thereby ensuring that the oxygen supply amounts in the two reaction tanks during gas stirring are inconsistent, and maintaining their respective proper oxygen-containing environment.

[0059] In the prior art, a suspended filler is provided in the aerobic nitrification mud membrane pool 5 as a carrier of microorganisms. However, due to the small density of the suspended filler, it is a common problem that the suspended filler is blocked between the aerobic nitrification mud membrane pool 5 and the sedimentation pool 6 due to the thrust of the water flow. During operation, the suspended filler is blocked, resulting in a rise in the water level, and finally the suspended filler fills the entire equipment, and water overflows from the top. In addition, due to the suction during use, the conventional reflux pump placed at the bottom of the aerobic nitrification mud membrane pool 5 is prone to sucking in the filler, resulting in blockage and damage. One solution is to use a dry reflux pump placed between the equipment. However, in order to protect the dry reflux pump from being blocked and damaged by the suspended filler during use, a hole box is usually provided on the outside of the suction end of the dry reflux pump to prevent the suspended filler from entering the reflux pump. However, during actual use, due to the large suction of the reflux pump, the suspended filler is blocked in the pores of the hole box, so that the reflux pump is always in a dry suction state, and the suction end hole box is also easily deflated and deformed, which cannot solve the problem of suspended filler blockage.

[0060] Therefore, the present application provides a nitrification liquid reflow zone 51 in the aerobic nitrification mud membrane pool 5, which is embedded in the aerobic nitrification mud membrane pool 5, and the aerobic nitrification mud membrane pool 5 outside the nitrification liquid reflow zone 51 is filled with suspended fillers for filtering solid impurities in sewage. The nitrification liquid reflow zone 51 is an area surrounded by a perforated plate, and holes are provided on the perforated plate, and the diameter of the holes is smaller than the diameter of the suspended fillers. The holes isolate the suspended fillers outside the nitrification liquid reflow zone 51, and a water hole 513 is provided on one side of the nitrification liquid reflow zone 51, so that the water in the aerobic nitrification mud membrane pool 5 flows into the aerodynamic mixing flocculation zone 61 through the water hole 513. Preferably, the water hole 513 is located at the lower end of the nitrification liquid reflow zone 51. Among them, the density of the holes is such that the through-hole flow rate of the water passing through the nitrification liquid reflow zone 51 is less than 0.1m / s, so as to prevent the suspended fillers from being gathered at the water hole 513 by water pressure, resulting in siltation of the suspended fillers. The nitrification liquid reflux area 51 is equivalent to a flow pool. The liquid level in the nitrification liquid reflux area 51 is consistent with the liquid level of the aerobic nitrification mud membrane pool 5, so as to avoid the problem of the reflux pump 512 running dry due to insufficient water level.

[0061] It is worth noting that due to the limitation of equipment size, if a water hole 513 is directly opened on the partition between the aerobic nitrification mud membrane pool 5 and the sedimentation tank 6, in order to ensure the flow state, and considering that the diameter of the water hole 513 needs to be smaller than the diameter of the suspended filler, the opening of the traditional water hole 513 between the aerobic nitrification mud membrane pool 5 and the sedimentation tank 6 is extremely limited, and the suspended filler is accumulated at the water hole 513 due to the thrust of the water flow, the water flow area is reduced, and the water flow is further accelerated, resulting in the suspended filler being unable to disperse under a large water pressure, thereby blocking the water hole 513. In order to solve the above problems, the present application provides an embedded nitrification liquid reflux zone 51 in the aerobic nitrification mud membrane pool 5, and the water flows through the nitrification liquid reflux zone 51 into the sedimentation tank 6. The nitrification liquid reflux zone 51 is an area surrounded by orifice plates, and holes are provided on the orifice plates on three sides of the area, which effectively reduces the water velocity, so that the through-hole flow velocity is less than 0.1m / s, and solves the problem of suspended filler accumulation. In addition, the height of the nitrification liquid reflux zone 51 can be increased according to the selection, the opening area is increased, and the water velocity is reduced. The water flowing out of the nitrification liquid reflux zone 51 passes through the water distribution assembly 611 on the partition of the aerodynamic mixing flocculation zone 61 and the flocculation pre-sedimentation zone 62, and then flows into the sedimentation tank 6, realizing the bottom in and top out of the water flow in the sedimentation tank. In the above, there is no need to limit the source of the nitrification liquid reflux liquid to the lower end of the aerobic nitrification mud membrane pool 5, so that the opening of the nitrification liquid reflux zone 51 is more flexible.

[0062] Furthermore, a reflux pump 512 is provided in the nitrification liquid reflux zone 51, and the reflux pump 512 is connected to the nitrification liquid reflux pipe 511, and the nitrification liquid reflux pipe 511 is connected to the anoxic denitrification mud membrane pool 3, so as to bring the nitrification liquid rich in nitrate in the aerobic nitrification mud membrane pool 5 to the anoxic denitrification mud membrane pool 3, and convert the nitrate into N2 through the mud membrane coupling denitrifying bacteria for discharge.

[0063] An aerodynamic mixing and flocculation zone 61 is arranged behind the nitrification liquid reflux zone 51. The aerodynamic mixing and flocculation zone 61 is connected with the nitrification liquid reflux zone 51 through a water hole 513. A dosing pipe 82 is introduced into the aerodynamic mixing and flocculation zone 61. The dosing pipe 82 is connected with a dosing chamber 81 for introducing a phosphorus removal agent. The dosing pipe 82 is located at the water hole 513. The water flow state impact from the water hole 513 is used to perform preliminary mixing of the agent. Furthermore, a coagulation gas stirring pipe 93 is introduced into the aerodynamic mixing and flocculation zone 61. Figure 5 As shown, the coagulation gas stirring tube 93 and the dosing tube 82 are arranged opposite to each other, and the air outlet of the coagulation gas stirring tube 93 is located near the outlet of the dosing tube 82 and is evenly distributed in the aerodynamic mixing and flocculation zone 61, so that the gas ejected from the air outlet of the coagulation gas stirring tube 93 forms an airflow impact on the dosing tube 82. The coagulation gas stirring tube 93 is connected to the fan 91 for introducing air to promote the sufficient mixing of the dephosphorization agent, thereby further ensuring the sufficient mixing and flocculation of the agent.

[0064] The present application is used for denitrification and phosphorus removal of low-carbon and high-phosphorus wastewater, and solves the problem of insufficient mixing of the dosing caused by the traditional equipment adding drugs to the front end of the sedimentation tank 6. The aerodynamic mixing and flocculation zone 61 adopts an air uniform mixing system, and a graduated ball valve is provided in the coagulation gas stirring pipe 93 to adjust the air intake volume. The graduated ball valve is used to accurately control the stirring intensity, replacing the traditional mechanical mixer, saving electricity, and reducing failure points. It is maintenance-free and easy to repair. In addition, the dosing and mixing process is limited to the aerodynamic mixing and flocculation zone 61, isolating the influence of ventilation and stirring on sedimentation, and avoiding airflow stirring to disturb the sedimentation process.

[0065] Furthermore, an over-liquid level alarm device 52 is provided in the aerobic nitrification mud membrane pool 5. The present application installs a liquid level meter. The liquid level alarm device 52 is connected to the water inlet pump to avoid water overflow when the liquid level rises due to special circumstances and to stop water inlet in time.

[0066] A water hole 513 is provided on one side of the nitrification liquid reflow zone 51, and water flows into the aerodynamic mixing flocculation zone 61 through the water hole 513, is fully mixed and reacted with the reagent, and then enters the sedimentation tank 6 from the water distribution component 611 at the upper end.

[0067] A flocculation pre-sedimentation zone 62 is provided between the aerobic nitrification sludge membrane tank 5 and the sedimentation tank 6 . The effluent from the aerodynamic mixing flocculation zone 61 first passes through the flocculation pre-sedimentation zone 62 and then flows into the sedimentation tank 6 .

[0068] The side of the flocculation pre-sedimentation zone 62 is provided with a baffle 621 to separate the flocculation pre-sedimentation zone 62 from the sedimentation tank 6. The water passing through the water distribution assembly 611 first enters the flocculation pre-sedimentation zone 62, forms turbulence through the inclined plate 622, and then enters the sedimentation tank 6 for secondary sedimentation.

[0069] Furthermore, the flocculation pre-sedimentation zone 62 is provided with mutually parallel inclined plates 622, and the inclined plates 622 are provided with water-passing strip holes to prevent floc deposition, so that the wastewater passes through the inclined plates to form turbulence, and the effluent enters the sedimentation tank 6 for further sedimentation. The inclined tubes 622 are preferably in the shape of honeycomb coal.

[0070] A water distribution assembly 611 for water flow is provided on the partitions of the aerodynamic mixing flocculation zone 61 and the flocculation pre-sedimentation zone 62. The water enters the flocculation pre-sedimentation zone 62 through the water distribution assembly 611, and then connects to the sedimentation tank 6 from the lower end of the flocculation pre-sedimentation zone 62. The water first enters the flocculation pre-sedimentation zone 62, and after preliminary sedimentation, enters the sedimentation tank 6 from the bottom for secondary sedimentation.

[0071] The water distribution assembly 611 includes a water distribution plate 612, and a long water flow hole is horizontally opened on the upper edge of the water distribution plate 612. In order to adjust the water flow passing through the long water flow hole, an adjustable weir plate 613 is provided at the rear end of the long water flow hole. A plurality of waist holes 614 are opened on the adjustable weir plate 613. Bolts 615 pass through the waist holes 614 and are connected to the water distribution plate 612. The adjustable weir plate 613 and the water distribution plate 612 are connected by bolts 615. By adjusting the height of the bolts 615, the water flow passing through the long water flow hole can be adjusted. When the foundation is uneven, the bolts 615 are adjusted to make the water flow through the adjustable weir plate 613 the same, so as to achieve uniform water flow between the aerobic nitrification mud membrane pool 5 and the sedimentation tank 6. The uneven water distribution caused by inaccurate equipment processing or uneven foundation of on-site equipment can be dealt with, so as to ensure uniform water distribution in most cases and ensure the sedimentation treatment effect of the sedimentation tank 6.

[0072] Preferably, the waist hole 614 on the adjustable weir plate 613 is in the shape of an inverted triangle. In addition, a rectangular, trapezoidal or other shapes may also be used to achieve the distribution of water flow from the aerobic nitrification mud membrane pool 5 to the sedimentation pool 6.

[0073] It is worth noting that in order to ensure that the wastewater reacts fully with the reagents during the flocculation and sedimentation stages, and to prevent the wastewater or reagents from flowing away with the incoming water before the reaction is complete, the reagents directly added are taken away before being fully mixed with the wastewater in the traditional coagulation and sedimentation stages. Therefore, the present application improves the reaction path of the reagents and the wastewater by designing the flow direction of the water flow. On the one hand, the water flows into the aerodynamic mixing and flocculation zone 61 from the water hole 513 opened on the pool wall of the nitrification liquid reflux zone 51. The faster water speed promotes its reaction with the flocculant. The water flows from the top of the aerodynamic mixing and flocculation zone 61 into the flocculation pre-sedimentation zone 62. On the other hand, the wastewater undergoes preliminary turbulence in the flocculation pre-sedimentation zone 62 to accelerate sedimentation, and then flows into the sedimentation tank 6 from the bottom of the flocculation pre-sedimentation zone 62, extending the reaction path so that both the wastewater on the upper liquid surface and the wastewater below can be fully treated.

[0074] The sedimentation tank 6 is provided with a plurality of inclined tube fillers 63, so that the mud in the wastewater is deposited from the inclined tube fillers 63 to the mud bucket. The inclined tube fillers 63 are preferably in the shape of honeycomb coal. The mud is deposited in the mud bucket through the inclined tube fillers 63 to prevent the mud from returning to the water flow due to water flow disturbance, thereby promoting the initial sedimentation of the wastewater.

[0075] The oblique tube filler 63 is easy to absorb flocculants, thereby clogging the oblique tube filler 63, but considering that there are many scattered points in rural areas of village and town sewage treatment equipment, they are generally operated automatically. During long-term use, the oblique tube filler 63 is extremely easy to be blocked, causing sludge to float up and affecting the water discharge effect. The oblique tube filler 63 needs to be manually cleaned regularly to ensure the operation effect. Therefore, the present application is provided with an anti-filler clogging device under the oblique tube filler 63. The anti-filler clogging device is an air washing pipe 94 that passes into the bottom of the oblique tube filler 63. No external power equipment is required. The existing fan 91 is used to pass a certain strength of gas into the sedimentation tank 6 to make the sludge or flocculants deposited on the oblique tube filler 63 fall off and sink into the mud bucket.

[0076] The air-wash regeneration filter tank 7 is located at the rear end of the sedimentation tank 6, and includes a lightweight porous suspended filter material and an air-wash pipe 94. The air-wash pipe 94 leads to the bottom of the suspended filter material. The suspended filter material is provided with limit orifice plates 71 above and below, respectively, and the suspended filter material is fixed in the air-wash regeneration filter tank 7 by the upper and lower limit orifice plates 71. Compared with conventional equipment, the present application does not need a matching backwash water pump and a backwash clear water tank, and only uses a set of aeration equipment as a backwash air source, and the inlet water is used as a backwash water source. The air-washing intensity is much lower than that of a conventional sand filter tank, which saves energy and reduces consumption. The SS of the effluent is less than 10 mg / L, and the treated water can directly enter the dosing unit for dissolving the agent.

[0077] The mud membrane coupled denitrification and dephosphorization sewage treatment device also includes an equipment room, in which a fan 91, a dosing unit and an ultraviolet disinfection unit 10 are arranged, and the dosing unit includes a dosing tank 81 and a dosing pipe 82, and the dosing pipe 82 is connected to the aerodynamic mixing flocculation zone 61;

[0078] The disinfection unit 10 includes an ultraviolet disinfector, which is arranged at the water outlet of the air washing regeneration filter tank 7. The effluent is disinfected by the disinfection unit 10 and then discharged.

[0079] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0080] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A water treatment tank, wherein a suspended filler is provided in the water treatment tank, characterized in that: The water treatment pool is provided with a flow zone, which is an area surrounded by a perforated plate. The perforated plate is provided with a hole, the diameter of the hole is smaller than the diameter of the suspended filler, and the hole isolates the suspended filler outside the flow zone. A water hole (513) is provided on one side of the flow zone, so that water in the water treatment pool flows into the next level pool through the water hole (513).

2. The water treatment pool according to claim 1, characterized in that: An aerodynamic mixing and flocculation zone (61) is arranged behind the flow zone. The aerodynamic mixing and flocculation zone (61) is connected to the flow zone through a water passage hole (513). A dosing pipe (82) is introduced into the aerodynamic mixing and flocculation zone (61). The outlet of the dosing pipe (82) is located at the rear end of the water passage hole (513).

3. The water treatment pool according to claim 2, characterized in that: The aerodynamic mixing and flocculation zone (61) is introduced with a coagulation gas stirring tube (93), which is arranged opposite to the dosing tube (82). The gas outlet of the coagulation gas stirring tube (93) is located near the outlet of the dosing tube (82) and is evenly distributed in the aerodynamic mixing and flocculation zone, so that the gas ejected from the gas outlet forms an air flow impact on the medicine dripped into the dosing tube (82).

4. The water treatment pool according to claim 1, characterized in that: A reflux pump (512) is provided in the flow zone.

5. A mud membrane coupled denitrification and phosphorus removal integrated sewage treatment device, comprising a deoxygenation and denitrification mud membrane pool (1), a pure anaerobic phosphorus release mud pool (2), an anoxic denitrification mud membrane pool (3), an aerobic carbon removal and phosphorus absorption mud membrane pool (4), an aerobic nitrification mud membrane pool (5), a sedimentation tank (6) and an air washing regeneration filter pool (7) connected in sequence along the water flow direction, characterized in that: The water treatment pool according to any one of claims 1 to 4 is used as an aerobic nitrification mud membrane pool (5), the flow zone is used as a nitrification liquid reflux zone (51), and the nitrification liquid reflux zone (51) is arranged in the aerobic nitrification mud membrane pool (5).

6. The integrated sewage treatment device for denitrification and phosphorus removal coupled with mud membrane according to claim 5 is characterized in that: An aerodynamic mixing and flocculation zone (61) is provided behind the nitrification liquid reflux zone (51), and a flocculation pre-sedimentation zone (62) is provided between the aerodynamic mixing and flocculation zone (61) and the sedimentation tank (6). The effluent of the aerodynamic mixing and flocculation zone (61) first passes through the flocculation pre-sedimentation zone (62) and then flows into the sedimentation tank (6).

7. The integrated sewage treatment device for denitrification and phosphorus removal by mud membrane coupling according to claim 6 is characterized in that: A baffle (621) is provided on the side of the flocculation pre-sedimentation zone (62), and mutually staggered inclined plates (622) are provided on the baffle (621), and water-passing strip holes are provided on the inclined plates (622).

8. The integrated sewage treatment device for denitrification and phosphorus removal by mud membrane coupling according to claim 7 is characterized in that: A water distribution assembly (611) is provided on the partition between the aerodynamic mixing flocculation zone (61) and the flocculation pre-sedimentation zone (62), and water enters the flocculation pre-sedimentation zone (62) through the water distribution assembly (611) and is then connected to the sedimentation tank (6) from the lower end of the flocculation pre-sedimentation zone (62).

9. The integrated sewage treatment device for denitrification and phosphorus removal by mud membrane coupling according to claim 8 is characterized in that: The water distribution assembly (611) comprises a water distribution plate (612), and the water distribution plate (612) is provided with long water holes in the horizontal direction.

10. The integrated sewage treatment device for denitrification and phosphorus removal by mud membrane coupling according to claim 9 is characterized in that: An adjustable weir plate (613) is provided at the rear end of the long water-passing hole of the water distribution plate (612), and a waist hole (614) is provided on the adjustable weir plate (613). The adjustable weir plate (613) and the water distribution plate (612) are connected by bolts (615), and the bolts (615) pass through the waist hole (614) and are connected to the water distribution plate (612).

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