Daily chemical industry wastewater treatment system

Abstract

The utility model relates to a wastewater treatment system in the daily chemical industry, which comprises an adjusting tank, a first lifting pump, an air flotation machine, a coagulative precipitation tank, a hydrolysis acidification tank, a transition tank, a middle tank and a primary aerobic tank which are sequentially communicated through sewage pipes, a second-stage aerobic tank and a second-stage sedimentation tank are sequentially arranged at the side part of the first-stage aerobic tank; the dosing unit comprises an alkali dosing device, a PAC dosing device and a PAM dosing device; the aeration device is connected into the regulating tank, the pipeline mixer, the primary aerobic tank and the secondary aerobic tank; the sludge discharge device comprises a sludge tank, a sludge discharge pump and a sludge pipe, and the sludge discharge pump is connected into the air flotation machine, the coagulative precipitation tank, the secondary precipitation tank and the sludge tank through the sludge pipe. According to the wastewater treatment system for the daily chemical industry, a physicochemical treatment process and a biochemical treatment process are combined, the metabolism of microorganisms is furthest benefited, the operation cost is low, the treatment effect is good, and the production wastewater of the daily chemical industry can be effectively treated.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment systems, in particular to a wastewater treatment system for daily chemical industry. Background Art

[0002] In recent years, with the rapid development of chemical synthesis industry, the production wastewater of daily chemical industry has increased day by day. The wastewater of this industry contains a large amount of anionic surfactants (LAS), animal and plant oils, flavors, pigments and other organic pollutants, with complex composition, high concentration of pollutants and poor biodegradability. Daily chemical wastewater is discharged into natural water bodies such as rivers and lakes without proper treatment, resulting in a decrease in dissolved oxygen content in the water body and deterioration of water quality, which not only affects the beauty of natural water landscape, but also directly threatens the survival of aquatic plants and animals, seriously damages aquatic ecosystems, and directly or indirectly has an adverse impact on human survival. Therefore, it is of great significance to find an economical and effective method to treat wastewater in the daily chemical industry. Utility Model Content

[0003] Based on this, the purpose of the utility model is to overcome the deficiencies of the prior art and provide a wastewater treatment system for the daily chemical industry.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A wastewater treatment system for daily chemical industry, comprising:

[0006] A regulating tank, a first lifting pump, an air flotation machine, a coagulation sedimentation tank, a hydrolysis acidification tank, a transition tank, an intermediate tank and a primary aerobic tank are sequentially connected through a sewage pipe, a grease trap is disposed adjacent to the regulating tank, the grease trap is connected to the regulating tank through a flow hole, a secondary aerobic tank and a secondary sedimentation tank are sequentially disposed on the side of the primary aerobic tank, and the primary aerobic tank, the secondary aerobic tank and the secondary sedimentation tank are sequentially connected;

[0007] A dosing unit, the dosing unit includes an alkali dosing device, a PAC dosing device and a PAM dosing device, the sewage pipe between the air flotation machine and the coagulation sedimentation tank is equipped with a pipeline mixer, the alkali dosing device is connected to the pipeline mixer and the intermediate tank, the PAC dosing device is connected to the air flotation machine and the pipeline mixer, and the PAM dosing device is connected to the air flotation machine;

[0008] an aeration device, wherein the aeration device is connected to the regulating tank, the pipeline mixer, the primary aerobic tank and the secondary aerobic tank;

[0009] And a sludge discharge device, the sludge discharge device comprises a sludge tank, a sludge discharge pump and a sludge pipe, the sludge discharge pump is connected to the flotation machine, the coagulation sedimentation tank, the secondary sedimentation tank and the sludge tank through the sludge pipe.

[0010] In one embodiment, the wastewater treatment system of the daily chemical industry also includes a waste gas treatment device, which is used to collect waste gas from the coagulation sedimentation tank, hydrolysis acidification tank, sludge tank and intermediate tank and perform deodorization treatment.

[0011] In one embodiment, the daily chemical industry wastewater treatment system also includes a sewage return pipe, one end of which is connected to the sewage pipe between the intermediate tank and the primary aerobic tank, and the other end is connected to the sewage pipe between the transition tank and the hydrolysis acidification tank.

[0012] In one embodiment, the wastewater treatment system for the daily chemical industry further includes a sludge return pipe, one end of which is connected to the mud outlet of the sludge pump, and the other end of which is connected to the hydrolysis acidification tank and the primary aerobic tank.

[0013] In one embodiment, the waste gas treatment device includes a waste gas pipe, a biological deodorization tower, a fan and an exhaust pipe. One end of the waste gas pipe is connected to the coagulation sedimentation tank, the hydrolysis acidification tank, the sludge tank and the intermediate tank, and the other end converges to the air inlet of the biological deodorization tower. The fan is arranged at the air outlet of the biological deodorization tower, and the exhaust pipe is connected to the air outlet of the fan.

[0014] In one embodiment, both the coagulation sedimentation tank and the intermediate tank are provided with online pH meters.

[0015] In one embodiment, the aeration device includes a blower, an air pipe and a tubular aerator. The tubular aerators are respectively arranged at the bottom of the regulating tank, the primary aerobic tank and the secondary aerobic tank. The blower transports air to the tubular aerator through the air pipe.

[0016] In one embodiment, an inclined tube filler is provided in the secondary sedimentation tank.

[0017] In one embodiment, a grille is provided in the grease trap.

[0018] In one embodiment, the hydrolysis acidification tank, the intermediate tank, the primary aerobic tank and the secondary aerobic tank are all provided with soft fillers.

[0019] The wastewater treatment system for the daily chemical industry in the embodiment of the present application can achieve good wastewater treatment effects. It combines physical and chemical treatment processes with biochemical treatment processes to maximize the benefits of microbial metabolism, has low operating costs, and good treatment effects, and can achieve effective treatment of production wastewater in the daily chemical industry.

[0020] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the wastewater treatment system of the daily chemical industry in the embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the structure of various types of pools in the embodiments of this application;

[0023] Description of reference numerals:

[0024] 11. Grease trap; 12. Regulating tank; 13. First lifting pump; 14. Flotation machine; 15. Pipeline mixer; 16. Coagulation sedimentation tank; 17. Hydrolysis acidification tank; 18. Transition tank; 19. Intermediate tank; 21. Primary aerobic tank; 22. Secondary aerobic tank; 23. Secondary sedimentation tank; 31. Alkali dosing device; 32. PAC dosing device; 33. PAM dosing device; 4. Aeration device; 41. Blower; 42. Tubular aerator; 51. Sludge tank; 52. Sludge pump; 6. Waste gas treatment device; 61. Biological deodorization tower; 62. Fan; 63. Exhaust pipe; 71. Sewage return pipe; 72. Sludge return pipe; 81. Online pH meter; 82. Inclined tube filler; 83. Grid; 84. Soft filler. DETAILED DESCRIPTION

[0025] To further illustrate each embodiment, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention.

[0026] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] See also Figure 1 to Figure 2The present embodiment provides a wastewater treatment system for daily chemical industry, comprising a regulating tank 12, a first lifting pump 13, an air flotation machine 14, a coagulation sedimentation tank 16, a hydrolysis acidification tank 17, a transition tank 18, an intermediate tank 19 and a primary aerobic tank 21 which are sequentially connected through a sewage pipe, wherein the regulating tank 12 is adjacently provided with a grease trap 11, the grease trap 11 is connected with the regulating tank 12 through a flow hole, a secondary aerobic tank 22 and a secondary sedimentation tank 23 are sequentially provided on the side of the primary aerobic tank 21, and the primary aerobic tank 21, the secondary aerobic tank 22 and the secondary sedimentation tank 23 are sequentially connected.

[0028] The wastewater treatment system for the daily chemical industry also includes a dosing unit, which includes an alkali dosing device 31, a PAC dosing device 32 and a PAM dosing device 33. The sewage pipe between the air flotation machine 14 and the coagulation sedimentation tank 16 is equipped with a pipeline mixer 15. The alkali dosing device 31 is connected to the pipeline mixer 15 and the intermediate tank 19, the PAC dosing device 32 is connected to the air flotation machine 14 and the pipeline mixer 15, and the PAM dosing device 33 is connected to the air flotation machine 14. The alkali dosing device 31 is used to add alkali to the pipeline mixer 15 and the intermediate tank 19, the PAC dosing device 32 is used to add coagulant to the air flotation machine 14 and the pipeline mixer 15, and the PAM dosing device 33 is used to add flocculant to the air flotation machine 14.

[0029] The daily chemical industry wastewater treatment system also includes an aeration device 4, which is connected to the regulating tank 12, the pipeline mixer 15, the primary aerobic tank 21 and the secondary aerobic tank 22. The aeration device 4 can introduce air into the regulating tank 12, the pipeline mixer 15, the primary aerobic tank 21 and the secondary aerobic tank 22 to perform aeration treatment, thereby playing the role of water volume regulation, water quality homogenization, and increasing oxygen content.

[0030] The daily chemical industry wastewater treatment system also includes a sludge discharge device, which includes a sludge tank 51, a sludge discharge pump 52 and a sludge pipe, and the sludge discharge pump 52 is connected to the air flotation machine 14, the coagulation sedimentation tank 16, the secondary sedimentation tank 23 and the sludge tank 51 through the sludge pipe. Thus, the sludge in the air flotation machine 14, the coagulation sedimentation tank 16 and the secondary sedimentation tank 23 is discharged into the sludge tank 51 through the sludge discharge device to achieve sludge removal.

[0031] The working principle of the daily chemical industry wastewater treatment system described in this embodiment is as follows:

[0032] Daily chemical wastewater (hereinafter referred to as wastewater) first flows into the oil separator 11. Since the wastewater contains a large amount of oil substances, a large amount of organic pollutants are dissolved in the oil. By removing the tar substances, some organic pollutants can also be removed, thereby reducing the operation load of the subsequent process. The wastewater is separated from oil and water in the oil separator 11, and the separated heavy oil is deposited in the bottom oil bucket. After the oil separation and sedimentation treatment, the wastewater still contains a certain amount of floating oil and dispersed oil. The wastewater and floating oil at the upper part enter the regulating tank 12 through the flow holes, and are aerated by the aeration device 4 in the regulating tank 12 to adjust the water volume and homogenize the water quality.

[0033] Then the first lifting pump 13 pumps the wastewater in the regulating tank 12 to the flotation machine 14. In the flotation machine 14, the oil, protein, SS, etc. in the wastewater react with the added PAC (coagulant) and PAM (flocculant) to form flocs, and combine with the microbubbles generated by flotation to form scum, which is scraped off to achieve the purpose of separating the various phases in the emulsified oil. The effluent of the flotation machine 14 flows into the pipeline mixer 15 by gravity, reacts with the alkali and coagulant again in the pipeline mixer 15, and enters the coagulation sedimentation tank 16 for coagulation and sedimentation again, thereby removing most of the organic matter in the wastewater and reducing the pressure of subsequent process treatment.

[0034] The wastewater then enters the hydrolysis acidification tank 17 from the coagulation sedimentation tank 16, where it is pre-acidified using anoxic bacteria. The microbial action of the anoxic bacteria degrades the macromolecular organic matter into small molecular organic matter, which is eventually converted into methane, carbon dioxide, etc.

[0035] Next, the wastewater comes out of the hydrolysis acidification tank 17 and enters the transition tank 18 and the intermediate tank 19 in turn. The alkali dosing device 31 adds alkali to the intermediate tank 19 to perform an alkalization reaction to further remove the oil pollution in the wastewater. Then, the wastewater enters the primary aerobic tank 21 and the secondary aerobic tank 22 in turn. The wastewater uses the metabolism of aerobic microorganisms to remove most of the organic pollutants, and the total nitrogen is removed by nitrification and denitrification. After that, the effluent flows by gravity into the secondary sedimentation tank 23. Among them, the aeration device 4 performs aeration treatment in the primary aerobic tank 21 and the secondary aerobic tank 22. In the secondary sedimentation tank 23, the sludge in the sewage settles in the mud bucket at the bottom of the tank by gravity, and the supernatant is discharged by gravity through the pipeline to meet the discharge standards.

[0036] The wastewater treatment system for the daily chemical industry in the embodiment of the present application can achieve good wastewater treatment effects. It combines physical and chemical treatment processes with biochemical treatment processes to maximize the benefits of microbial metabolism, has low operating costs, and good treatment effects, and can achieve effective treatment of production wastewater in the daily chemical industry.

[0037] The wastewater treatment system for the daily chemical industry in this embodiment further includes a waste gas treatment device 6, which is used to collect and deodorize waste gas from the coagulation sedimentation tank 16, the hydrolysis acidification tank 17, the sludge tank 51 and the intermediate tank 19. By setting it in this way, it is also possible to prevent the odor generated during the wastewater treatment process from polluting the air, thereby improving the environmental protection of the treatment process.

[0038] Specifically, the waste gas treatment device 6 includes a waste gas pipe, a biological deodorization tower 61, a fan 62 and an exhaust pipe 63. One end of the waste gas pipe is connected to the coagulation sedimentation tank 16, the hydrolysis acidification tank 17, the sludge tank 51 and the intermediate tank 19, and the other end is connected to the air inlet of the biological deodorization tower 61. The fan 62 is arranged at the air outlet of the biological deodorization tower 61, and the exhaust pipe 63 is connected to the air outlet of the fan 62. The odor generated by the coagulation sedimentation tank 16, the hydrolysis acidification tank 17, the sludge tank 51 and the intermediate tank 19 enters the biological deodorization tower 61 for deodorization treatment, and then is discharged from the exhaust pipe 63.

[0039] Preferably, the wastewater treatment system for the daily chemical industry of this embodiment further includes a sewage return pipe 71, one end of which is connected to the sewage pipe between the intermediate tank 19 and the primary aerobic tank 21, and the other end is connected to the sewage pipe between the transition tank 18 and the hydrolysis acidification tank 17. Thus, the wastewater flowing out of the intermediate tank 19 can flow back to the transition tank 18 again and be treated again to ensure the decontamination effect.

[0040] Preferably, the wastewater treatment system for the daily chemical industry of this embodiment further includes a sludge return pipe 72, one end of which is connected to the sludge outlet of the sludge pump 52, and the other end is connected to the hydrolysis acidification tank 17 and the primary aerobic tank 21. The sludge is still mixed with some wastewater, and thus, the sludge is returned to the hydrolysis acidification tank 17 and the primary aerobic tank 21 for further treatment.

[0041] Preferably, both the coagulation sedimentation tank 16 and the intermediate tank 19 are provided with an online pH meter 81 to monitor the pH values ​​of the coagulation sedimentation tank 16 and the intermediate tank 19 to avoid excessive addition of alkali.

[0042] Preferably, the aeration device 4 includes a blower 41, an air pipe and a tubular aerator 42. The tubular aerator 42 is respectively arranged at the bottom of the regulating tank 12, the primary aerobic tank 21 and the secondary aerobic tank 22. The blower 41 transports air to the tubular aerator 42 through the air pipe. The aeration device 4 arranged in this way has a better aeration effect.

[0043] Preferably, the secondary sedimentation tank 23 is provided with an inclined tube filler 82. By using the inclined tube filler 82 in the secondary sedimentation tank 23, the processing capacity thereof can be effectively improved.

[0044] Preferably, a grid 83 is provided in the grease trap 11 to isolate larger impurities.

[0045] Preferably, the hydrolysis acidification tank 17, the intermediate tank 19, the primary aerobic tank 21 and the secondary aerobic tank 22 are all provided with soft fillers 84. The soft fillers 84 have the advantages of large specific surface area, high utilization rate, variable gaps without blockage, wide application range, low cost, low freight, etc., and can make the water body contact with a large amount of gas. This is conducive to the dissolution and exchange of oxygen in the water body and improves the oxygen content of the water body.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model manual self-centering vise. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A wastewater treatment system for daily chemical industry, characterized in that: include: A regulating tank, a first lifting pump, an air flotation machine, a coagulation sedimentation tank, a hydrolysis acidification tank, a transition tank, an intermediate tank and a primary aerobic tank are sequentially connected through a sewage pipe, a grease trap is disposed adjacent to the regulating tank, the grease trap is connected to the regulating tank through a flow hole, a secondary aerobic tank and a secondary sedimentation tank are sequentially disposed on the side of the primary aerobic tank, and the primary aerobic tank, the secondary aerobic tank and the secondary sedimentation tank are sequentially connected; A dosing unit, the dosing unit includes an alkali dosing device, a PAC dosing device and a PAM dosing device, the sewage pipe between the air flotation machine and the coagulation sedimentation tank is equipped with a pipeline mixer, the alkali dosing device is connected to the pipeline mixer and the intermediate tank, the PAC dosing device is connected to the air flotation machine and the pipeline mixer, and the PAM dosing device is connected to the air flotation machine; an aeration device, wherein the aeration device is connected to the regulating tank, the pipeline mixer, the primary aerobic tank and the secondary aerobic tank; And a sludge discharge device, the sludge discharge device comprises a sludge tank, a sludge discharge pump and a sludge pipe, the sludge discharge pump is connected to the flotation machine, the coagulation sedimentation tank, the secondary sedimentation tank and the sludge tank through the sludge pipe.

2. The daily chemical industry wastewater treatment system according to claim 1, characterized in that: It also includes a waste gas treatment device, which is used to collect waste gas from the coagulation sedimentation tank, hydrolysis acidification tank, sludge tank and intermediate tank and perform deodorization treatment.

3. The daily chemical industry wastewater treatment system according to claim 2 is characterized in that: It also includes a sewage return pipe, one end of which is connected to the sewage pipe between the intermediate tank and the primary aerobic tank, and the other end is connected to the sewage pipe between the transition tank and the hydrolysis acidification tank.

4. The daily chemical industry wastewater treatment system according to claim 3 is characterized by: It also includes a sludge return pipe, one end of which is connected to the sludge outlet of the sludge pump, and the other end is connected to the hydrolysis acidification tank and the primary aerobic tank.

5. The daily chemical industry wastewater treatment system according to claim 2, characterized in that: The waste gas treatment device includes a waste gas pipe, a biological deodorization tower, a fan and an exhaust pipe. One end of the waste gas pipe is connected to the coagulation sedimentation tank, the hydrolysis acidification tank, the sludge tank and the intermediate tank, and the other end converges to the air inlet of the biological deodorization tower. The fan is arranged at the air outlet of the biological deodorization tower, and the exhaust pipe is connected to the air outlet of the fan.

6. The daily chemical industry wastewater treatment system according to claim 1, characterized in that: The coagulation sedimentation tank and the intermediate tank are both provided with online pH meters.

7. The daily chemical industry wastewater treatment system according to claim 1, characterized in that: The aeration device comprises a blower, an air pipe and a tubular aerator. The tubular aerator is respectively arranged at the bottom of the regulating tank, the primary aerobic tank and the secondary aerobic tank. The blower conveys air to the tubular aerator through the air pipe.

8. The daily chemical industry wastewater treatment system according to claim 1, characterized in that: The secondary sedimentation tank is provided with an inclined tube filler.

9. The daily chemical industry wastewater treatment system according to claim 1, characterized in that: A grid is arranged in the grease trap.

10. The daily chemical industry wastewater treatment system according to any one of claims 1 to 9, characterized in that: The hydrolysis acidification tank, the intermediate tank, the primary aerobic tank and the secondary aerobic tank are all provided with soft fillers.

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