Sewage treatment device capable of adjusting inlet liquid distribution

Abstract

The invention discloses a sewage treatment device capable of adjusting inlet liquid distribution. Comprising an anoxic tank, an aerobic tank and a secondary sedimentation tank which are sequentially communicated, a water inlet distribution channel is arranged on the water inlet side of the anoxic tank; one end of the water inlet distribution channel is communicated with the anoxic tank through a water passing hole; the other end of the water inlet distribution channel is communicated with the aerobic tank through a pipeline; a plurality of groups of baffle rails are arranged in the water inlet distribution channel along the length direction, a controlled water-proof baffle is arranged in each group of baffle rails, and the water inlet distribution channel is divided into a plurality of sub water inlet distribution channels which are not communicated with one another by the water-proof baffles; a water quality detection device is arranged at any end of the water inlet distribution channel; and the control device is used for controlling each controlled waterproof baffle in the water inlet distribution channel to be opened or closed according to the result of the water quality detection device so as to control the proportion of water entering the anoxic tank and the aerobic tank.

Description

Technical Field

[0001] This invention relates to a wastewater treatment device with adjustable influent distribution. Background Technology

[0002] In the actual operation of biological treatment ponds, the concentrations of COD, ammonia nitrogen, and total nitrogen in the influent are not constant, and the influent volume also fluctuates. This poses a certain risk to achieving the required effluent quality. In the actual design, the design parameters are fixed and it is difficult to cope with changes in the quality and quantity of the influent. Achieving the optimal carbon-nitrogen ratio in the influent is a challenge in operation.

[0003] Secondly, in actual operation, the wastewater treatment effect also has certain deviations. In the aerobic tank, the conversion rate of ammonia nitrogen to nitrate nitrogen is affected by external factors such as temperature, carbon-nitrogen ratio, and dissolved oxygen. The removal of total nitrogen is also related to the reflux rate of nitrification liquid. How to flexibly configure the reflux of nitrification liquid is the key to the total nitrogen removal effect.

[0004] Finally, the denitrifying bacteria in the anoxic tank are autotrophic and do not require high COD concentrations, while the bacteria in the aerobic tank are heterotrophic and require a certain COD concentration. However, since the anoxic tank is at the upstream end, the COD concentration is relatively high, which has a certain inhibitory effect on denitrifying bacteria. Therefore, how to adjust the COD concentration in the anoxic and aerobic tanks is crucial in actual operation and is related to the removal efficiency of total nitrogen and COD.

[0005] In actual operation, since the design influent concentration, influent volume and nitrification liquor return flow are fixed and difficult to change, it is difficult to cope with changes in water quality and quantity in reality. Therefore, the problem of flexibly configuring the influent and nitrification liquor return flow of the anoxic and aerobic tanks in the biological tank according to the actual operation situation needs to be solved. Summary of the Invention

[0006] To overcome the above-mentioned defects, the purpose of this invention is to provide a wastewater treatment device with adjustable liquid inlet distribution.

[0007] To achieve the above objectives, the wastewater treatment device with adjustable influent distribution of the present invention includes an anoxic tank, an aerobic tank, and a secondary sedimentation tank arranged in sequence. An inlet distribution channel is provided on the inlet side of the anoxic pool; One end of the water inlet distribution channel is connected to the anoxic pool via a water passage; the other end of the water inlet distribution channel is connected to the aerobic pool via a pipe. Multiple sets of baffle tracks are arranged along the length of the water inlet distribution channel. A controlled water-blocking baffle is installed in each set of baffle tracks. The water-blocking baffles divide the water inlet distribution channel into multiple non-interconnected sub-water inlet distribution channels. A water quality testing device is installed at either end of the water inlet distribution channel; A control device is used to control the opening or closing of each controlled baffle in the inlet distribution channel based on the results of the water quality testing device, so as to control the proportion of water entering the anoxic pool and the aerobic pool.

[0008] Furthermore, a nitrification liquid distribution channel is installed at the end of the aerobic tank; One end of the nitrification liquid distribution channel is connected to the anoxic tank via a pipeline; the other end of the return liquid is connected to the secondary sedimentation tank via a pipeline. Multiple sets of baffle tracks are arranged along the length of the nitrification liquid distribution channel. A controlled water-proof baffle is installed in each baffle track. The water-proof baffle divides the return liquid into multiple non-interconnected sub-nitrification liquid distribution channels. A nitrification liquid detection device is installed at either end of the nitrification liquid distribution channel; The control device is used to control the opening or closing of each controlled baffle in the nitrification liquid distribution channel according to the result of the reflux liquid detection device, so as to control the proportion of reflux liquid entering the anoxic tank and the secondary sedimentation tank.

[0009] Furthermore, an outlet distribution channel is provided on the outlet side of the secondary sedimentation tank; The effluent is distributed to the anoxic tank through an effluent return pipe at one end of the effluent distribution channel; the next treatment unit is connected to the other end of the effluent distribution channel through a pipeline.

[0010] This invention utilizes distribution channels at the ends of anoxic and aerobic tanks. Water-impermeable baffles within these channels are equipped with baffle tracks, with the baffles positioned in the center. The tracks can be flexibly removed or inserted using lifting lugs, allowing for precise control of the wastewater volume entering the anoxic and aerobic tanks. This method of water quality and quantity control is not only simple and quick to install but also convenient for maintenance and replacement, requiring only the replacement of the water-impermeable baffles. Furthermore, this invention enables the anoxic tank to withstand the impact of external influent flow and mitigates the impact of changes in external water quality. It also solves the problem of flexibly adjusting wastewater volume based on influent quality and quantity during anoxic tank influent and aerobic tank nitrification liquor return, further improving the wastewater treatment efficiency of the biological treatment tank, ensuring its safe, stable, and effective operation, and reducing resource waste. Attached Figure Description

[0011] Figure 1 This is a planar representation of the overall structure.

[0012] Figure 2 This is a schematic cross-sectional view of the overall structure.

[0013] Figure 3 This is a schematic diagram of the water distribution channel.

[0014] Figure 4 This is a schematic diagram of the cross-section of the water distribution channel.

[0015] Figure 5 This is a schematic diagram of the cross-section of the water-resistant baffle.

[0016] In the diagram: 1. Anoxic tank; 2. Aerobic tank; 3. Secondary sedimentation tank; 11. Inlet pipe; 12. Inlet well; 13. Inlet distribution channel; 131. Central baffle; 133. Lifting lug; 134. Reinforcing rib; 135. Baffle track; 14. Distribution pipe; 15. Mixer; 16. Water passage; 17. COD online detector; 18. Nitrate nitrogen online detector; 21. Aeration system; 22. Nitrified liquid distribution channel; 31. Sludge pump; 32. Sludge return pipe; 33. Secondary sedimentation tank outlet pipe; 34. Nitrified liquid return pipe; 35. Outlet water return pipe; 36. Outlet water distribution tank. Detailed Implementation

[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The wastewater treatment device with adjustable influent distribution of the present invention includes an anoxic tank, an aerobic tank and a secondary sedimentation tank arranged in sequence. An inlet distribution channel is provided on the inlet side of the anoxic pool; One end of the water inlet distribution channel is connected to the anoxic pool via a water passage; the other end of the water inlet distribution channel is connected to the aerobic pool via a pipe. Multiple sets of baffle tracks are arranged along the length of the inlet distribution channel. Each set of baffle tracks consists of two tracks positioned opposite each other on both sides of the distribution channel. A water-isolating baffle is installed within each set of baffle tracks, dividing the inlet distribution channel into multiple non-interconnected sub-inlet distribution channels. The water-isolating baffles can be manually operated or controlled by electric or pneumatic lifting devices. The lifting and lowering of the water-isolating baffles within the baffle tracks, whether manual or controlled, controls the proportion of inlet water entering the anoxic and aerobic tanks. The number of water-isolating baffles is designed based on the length of the distribution channel and the required distribution ratio, generally ranging from 4 to 30.

[0022] A water quality testing device is installed at either end of the water inlet distribution channel; the water quality testing device can be an online COD analyzer, an online nitrate nitrogen analyzer, etc.

[0023] The control device, such as a PLC, is used to control the opening or closing of each controlled baffle in the inlet distribution channel based on the results of the water quality detection device, so as to control the proportion of water entering the anoxic pool and the aerobic pool.

[0024] Example 1: like Figures 1 to 5 As shown, the wastewater treatment tank in this embodiment includes an anoxic tank 1, an aerobic tank 2, and a secondary sedimentation tank 3. The influent to the anoxic tank 1 is distributed to both the anoxic tank 1 and the aerobic tank 2 via an influent distribution channel 13. Four controlled baffles 131 are evenly arranged in the influent distribution channel 13, dividing it into five sub-distribution channels. One end of each sub-distribution channel has a water passage 16 connecting to the anoxic tank 1; the other end has a distribution pipe 14 connecting to the aerobic tank. An online COD analyzer 17 and an online nitrate nitrogen analyzer 18 are installed in the influent distribution channel 13 to determine the influent concentration and calculate the appropriate wastewater volume.

[0025] Similarly, three controlled baffles 131 are evenly arranged in the nitrification liquid distribution channel 22, dividing the nitrification liquid distribution channel 22 into four sub-distribution channels. One end of the sub-distribution channel is connected to the secondary sedimentation tank; the other end of the sub-distribution channel is connected to the anoxic tank. An online nitrate nitrogen detector 18 is installed in the influent distribution channel 22.

[0026] For example, the wastewater in the aerobic tank is divided into three portions, and the operation is as follows: After the lifting lug 133 is driven by the electric and pneumatic lifting device to open the two water-proof baffles 131 near the top, the three portions of wastewater enter the anoxic tank 1 through the water passage 16. Meanwhile, one portion of wastewater in the sub-inlet distribution channel at the lower end of the inlet distribution channel enters the aerobic tank through the distribution pipe 14.

[0027] For example, consider a four-part wastewater system: one part is in the aerobic tank, and the wastewater in the anoxic tank is divided into four parts. The operation is as follows: the lifting lugs 133 are driven by electric and pneumatic lifting devices to open the three water-blocking baffles 131 near the top. The four parts of wastewater then enter the anoxic tank 1 through the water passage 16. Meanwhile, one part of the wastewater in the sub-inlet distribution channel at the lower end of the inlet distribution channel enters the aerobic tank through the distribution pipe 14.

[0028] For example, if the wastewater is divided into two portions in the aerobic tank and three portions in the anoxic tank, the operation is as follows: After the electric and pneumatic lifting device drives the lifting lug 133 to open the two water-blocking baffles 131 near the upper end, the three portions of wastewater enter the anoxic tank 1 through the water passage 16. After the electric and pneumatic lifting device drives the lifting lug 133 to open the water-blocking baffle 131 near the lower end, the two portions of wastewater in the two sub-inlet distribution channels at the lower end of the inlet distribution channel enter the aerobic tank through the distribution pipe 14.

[0029] In the anoxic tank 1, the mud and water are thoroughly mixed under the stirring of the mixer 15, maintaining an anoxic state to provide the environment required by denitrifying bacteria. In the aerobic tank 2, the wastewater is supplied with oxygen by the aeration system 21, converting ammonia nitrogen in the water into nitrate nitrogen and removing COD, etc. The wastewater containing nitrate nitrogen flows through the nitrified liquid distribution channel 22, with a portion entering the secondary sedimentation tank 3 and a portion entering the anoxic tank 1, depending on the setup. The nitrified liquid recirculation ratio is generally 100%~400%, and can be flexibly allocated according to actual operating conditions, specifically based on the total nitrogen removal effect.

[0030] After the sewage enters the secondary sedimentation tank, it undergoes sludge-water separation. Some of the sludge is returned to the inlet well 12 via sludge pump 31 and sludge return pipe 32. A water-blocking baffle (131) is installed in the effluent channel of the secondary sedimentation tank (3). The water-blocking baffle (131) blocks the effluent pipe (33) of the secondary sedimentation tank. Unqualified effluent can be distributed to the anoxic tank (1) through the effluent return pipe (35) for further treatment. When the secondary sedimentation tank meets the treatment standards, the water-blocking baffle (131) blocks the effluent return pipe (35), and the qualified sewage flows into the next treatment unit from the effluent pipe (33) of the secondary sedimentation tank.

[0031] This invention provides a flexible configuration method for the influent and nitrification liquid return flow rates of the anoxic and aerobic tanks in a biological treatment pond, based on actual operating conditions, thereby improving the application of the biological treatment pond and further enhancing its wastewater treatment efficiency.

[0032] Example 2 This embodiment is a variation of Embodiment 1.

[0033] The difference between this embodiment and embodiment 1 is that the baffles in the water inlet distribution channel 13 and the nitrification liquid distribution channel 22 are manual baffles.

[0034] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0035] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wastewater treatment device with adjustable influent distribution, characterized in that, It includes an anoxic tank, an aerobic tank, and a secondary sedimentation tank that are connected in sequence; An inlet distribution channel is provided on the inlet side of the anoxic pool; One end of the water inlet distribution channel is connected to the anoxic pool via a water passage; the other end of the water inlet distribution channel is connected to the aerobic pool via a pipe. Multiple sets of baffle tracks are arranged along the length of the water inlet distribution channel. A controlled water-blocking baffle is set for each set of baffle tracks. The controlled water-blocking baffle divides the water inlet distribution channel into multiple non-interconnected sub-water inlet distribution channels. A water quality testing device is installed at either end of the water inlet distribution channel; A control device is used to control the opening or closing of each controlled baffle in the inlet distribution channel based on the results of the water quality testing device, so as to control the proportion of water entering the anoxic pool and the aerobic pool.

2. The wastewater treatment device with adjustable influent distribution as described in claim 1, characterized in that, A nitrification liquid distribution channel is installed at the end of the aerobic tank; One end of the nitrification liquid distribution channel is connected to the anoxic tank via a pipeline; the other end of the nitrification liquid distribution channel is connected to the secondary sedimentation tank via a pipeline. Multiple sets of baffle tracks are arranged along the length of the nitrification liquid distribution channel. A controlled water-proof baffle is installed in each set of baffle tracks. The water-proof baffle divides the nitrification liquid distribution channel into multiple non-interconnected sub-nitrification liquid distribution channels. A nitrification liquid detection device is installed at either end of the nitrification liquid distribution channel; The control device is used to control the opening or closing of each controlled baffle in the nitrification liquid distribution channel according to the result of the nitrification liquid detection device, so as to control the proportion of nitrification liquid entering the anoxic tank and the secondary sedimentation tank.

3. The wastewater treatment device with adjustable influent distribution as described in claim 1, characterized in that, An outlet distribution channel is provided on the outlet side of the secondary sedimentation tank; The effluent is distributed to the anoxic tank through an effluent return pipe at one end of the effluent distribution channel; the next treatment unit is connected to the other end of the effluent distribution channel through a pipeline.

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