Chemical waste water treatment system

Abstract

The utility model provides a kind of chemical wastewater treatment system, carries out advanced treatment to chemical wastewater, reduces processing cost while improving wastewater treatment efficiency, finally can realize sewage discharge up to standard.The utility model includes fine grid channel, regulating basin, ozone oxidation pond, hydrolytic acidification pond, Phoredox pond, Fenton reaction pond, final sedimentation tank, denitrification filter tank and disinfection tank, fine grid channel, regulating basin, ozone oxidation pond, hydrolytic acidification pond, Phoredox pond, Fenton reaction pond, final sedimentation tank, denitrification filter tank, disinfection tank are sequentially connected;Phoredox pond is mainly composed of pre-anaerobic tank, anaerobic tank, anoxic tank I, aerobic tank I, anoxic tank II, aerobic tank II and MBR membrane pond, pre-anaerobic tank, anaerobic tank, anoxic tank I, aerobic tank I, anoxic tank II, aerobic tank II, MBR membrane pond are sequentially connected;The final sedimentation tank is mainly composed of coagulation tank, flocculation tank and sedimentation tank, coagulation tank, flocculation tank, sedimentation tank are sequentially connected.

Description

Technical Field

[0001] This utility model relates to a chemical wastewater treatment system and belongs to the field of wastewater treatment. Background Technology

[0002] With the rapid development of my country's chemical industry, industries with severe pollution, such as pharmaceuticals, chemicals, electroplating, and dyeing, discharge large amounts of chemical wastewater, leading to increasingly serious environmental pollution problems. Conventional treatment processes are insufficient to achieve stable compliance with discharge standards for this type of wastewater. Chemical wastewater is characterized by: containing substances toxic to microorganisms, high organic pollution, strong acid and alkali content, unbalanced nutrient ratios, and high salt content. Simple wastewater treatment processes are ineffective in treating it. Direct discharge of chemical wastewater into natural water bodies will deplete dissolved oxygen, causing the death of aquatic plants and animals. Therefore, chemical wastewater must be properly treated before discharge.

[0003] The main challenges in treating chemical wastewater are high COD concentration, high salinity, and fluctuating water quality and quantity, making treatment difficult and costly. Currently, a three-stage treatment process is generally employed.

[0004] 1. Pretreatment: Firstly, it removes suspended solids and other substances from the water, which can be achieved through processes such as coagulation and sedimentation. Secondly, it improves the biodegradability of the wastewater by employing advanced oxidation or pre-hydrolysis methods, thereby breaking down the molecular chains between organic matter. After the molecular weight of the organic matter is reduced, it becomes easier for subsequent biological treatment.

[0005] 2. Biochemical treatment: Most organic matter is degraded at this stage through the metabolism of microorganisms, and nitrogen and phosphorus are also removed to a certain extent. If a combined biochemical treatment process is used, the treatment effect on chemical wastewater will be stronger.

[0006] 3. Advanced treatment: The remaining organic matter after biochemical treatment is difficult to degrade further. Therefore, it is recommended to use advanced oxidation technology as an advanced treatment process for wastewater to further reduce COD concentration.

[0007] Existing conventional chemical wastewater treatment processes still have room for improvement in treatment efficiency and further reduction in treatment costs. Utility Model Content

[0008] The purpose of this invention is to overcome the above-mentioned shortcomings in the existing technology and provide a chemical wastewater treatment system with a reasonable structural design, which can perform deep treatment of chemical wastewater, improve wastewater treatment efficiency while reducing treatment costs, and ultimately achieve the goal of achieving wastewater discharge that meets standards.

[0009] The technical solution adopted by this utility model to solve the above problems is as follows: a chemical wastewater treatment system, including a fine screen channel, an equalization tank, an ozone oxidation tank, a hydrolysis acidification tank, a Phoredox tank, a Fenton reaction tank, a final sedimentation tank, a denitrification filter, and a disinfection tank, wherein the fine screen channel, equalization tank, ozone oxidation tank, hydrolysis acidification tank, Phoredox tank, Fenton reaction tank, final sedimentation tank, denitrification filter, and disinfection tank are connected in sequence; the Phoredox tank mainly consists of a pre-anaerobic tank, an anaerobic tank, an anoxic tank I, an aerobic tank I, an anoxic tank II, an aerobic tank II, and an MBR membrane tank, wherein the pre-anaerobic tank, anaerobic tank, anoxic tank I, aerobic tank I, anoxic tank II, aerobic tank II, and MBR membrane tank are connected in sequence; the final sedimentation tank mainly consists of a coagulation tank, a flocculation tank, and a sedimentation tank, wherein the coagulation tank, flocculation tank, and sedimentation tank are connected in sequence.

[0010] The fine screen channel described in this utility model is equipped with a solid-liquid separation device.

[0011] Submersible mixers are installed in the equalization tank, hydrolysis acidification tank, pre-anaerobic tank, anaerobic tank, anoxic tank I and anoxic tank II described in this utility model.

[0012] The ozone oxidation tank described in this utility model is equipped with an aeration device I.

[0013] The aerobic tank I and aerobic tank II described in this utility model are equipped with an aeration device II.

[0014] The MBR membrane tank described in this invention is equipped with an MBR membrane module.

[0015] The Fenton reaction tank, coagulation tank, and flocculation tank described in this invention are all equipped with mechanical stirring devices.

[0016] The present invention provides a neutralization aeration tank between the Fenton reaction tank and the final settling tank, and the neutralization aeration tank is equipped with an aeration and stirring device.

[0017] The sedimentation tank described in this utility model is equipped with a sludge scraping device and an outlet weir.

[0018] The denitrification filter of this invention is installed from top to bottom with quartz sand, pebbles, filter bricks and an aeration system.

[0019] Compared with the prior art, this utility model has the following advantages and effects:

[0020] (1) Use fine screen channels to separate larger particulate matter and fibrous materials (such as hair, paper scraps, branches and small plastic particles) in chemical wastewater, so as to avoid the suspension of matter clogging or wear of equipment and ensure the normal operation of subsequent processes.

[0021] (2) An ozone oxidation tank and a hydrolysis acidification tank are set up. Ozone is introduced into the chemical wastewater, which can destroy the molecular structure of recalcitrant pollutants and decompose them into small molecule organic matter, providing good conditions for subsequent biochemical treatment. The hydrolysis acidification tank can convert recalcitrant macromolecules into easily biodegradable small molecules, further improving the biodegradability of wastewater, reducing the difficulty of subsequent wastewater treatment, and improving wastewater treatment efficiency.

[0022] (3) Using the Phoredox pool, in A 2 Based on the O process, a pre-anaerobic tank, an anoxic tank II, and an aerobic tank II are added, the secondary sedimentation tank is eliminated, and an advanced membrane treatment process is adopted to achieve efficient removal of substances such as COD, phosphorus, and nitrogen, while reducing sludge volume and lowering treatment costs.

[0023] (4) The Fenton reactor can further remove phosphorus while treating organic matter that is difficult to biochemically process.

[0024] (5) Denitrification filters can efficiently remove nitrogen and ensure that the effluent meets the standards. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0026] Figure 2-1 and Figure 2-2 These are a plan view and a cross-sectional view of the fine grid channel according to an embodiment of this utility model.

[0027] Figure 3 This is a plan view of the regulating tank in an embodiment of the present invention.

[0028] Figure 4-1 and Figure 4-2 The figures shown are a plan view and a cross-sectional view of the ozone oxidation tank and the hydrolysis acidification tank, respectively, according to embodiments of this utility model.

[0029] Figure 5-1 and Figure 5-2 These are a plan view and a cross-sectional view of the Phoredox pool according to an embodiment of this utility model.

[0030] Figure 6-1 and Figure 6-2 These are a plan view and a cross-sectional view of the Fenton reaction cell according to an embodiment of this utility model.

[0031] Figure 7-1 and Figure 7-2 These are a plan view and a cross-sectional view of the final sedimentation tank according to an embodiment of this utility model.

[0032] Figure 8 This is a cross-sectional view of the denitrification filter in an embodiment of the present invention.

[0033] Figure 9 This is a plan view of the disinfection pool according to an embodiment of the present invention. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0035] like Figure 1 As shown, the embodiment of this utility model includes a fine screen channel 1, an equalization tank 2, an ozone oxidation tank 3, a hydrolysis acidification tank 4, a Phoredox tank 5, a Fenton reaction tank 6, a final sedimentation tank 7, a denitrification filter 8, and a disinfection tank 9, which are connected in sequence.

[0036] like Figure 2-1 and Figure 2-2 As shown, a solid-liquid separation device 10 is installed inside the fine screen channel 1. The solid-liquid separation device 10 is installed at an angle inside the sewage channel of the fine screen channel 1 to intercept and remove large suspended solids and floating objects in the sewage, so as to protect the normal operation of the water pump and subsequent treatment facilities. After being treated by the fine screen channel 1, the wastewater enters the equalization tank 2.

[0037] like Figure 3 As shown, a submersible mixer 11 is installed in the equalization tank 2. The submersible mixer 11 is driven by a motor to rotate the impeller, converting the kinetic energy of the water into mechanical energy. This causes the impeller to drive the surrounding water to generate strong circulation and tangential flow, thereby achieving the purpose of mixing, stirring, and promoting the flow of wastewater. Chemical wastewater has a complex composition and unstable flow rate. In the equalization tank 2, wastewater from different sources and at different times (such as rainwater) can be mixed to reduce fluctuations in water quality and flow rate, and reduce the impact on subsequent treatment units.

[0038] like Figure 4-1 and Figure 4-2 As shown, an aeration device I12 is installed in ozone oxidation tank 3. The aeration device I12 includes components such as an ozone generator, ozone aeration discs, a tail gas destruction device, and aeration pipes. The ozone generator is generally installed in an ozone equipment room, and its supporting equipment typically includes an air compressor, air tank, refrigerated dryer, oxygen generator, plate heat exchanger, power supply cabinet, and the generator itself; its main function is to supply ozone. The ozone aeration discs are generally made of titanium alloy and are usually installed at the bottom of ozone oxidation tank 3. Ozone is transported to the aeration discs via ozone aeration pipes. The aeration discs generate a large number of microbubbles through their microporous structure, increasing the contact opportunity between ozone and pollutants and improving oxidation efficiency. After the wastewater reacts with ozone, the molecules of recalcitrant pollutants are decomposed and transformed into small-molecule organic matter. Residual ozone is discharged from the top to the tail gas destruction device for harmless treatment.

[0039] The hydrolysis acidification tank 4 is equipped with a submersible mixer 11, which is used to mix, stir and push the wastewater. The wastewater is further improved in the hydrolysis acidification tank 4 to improve its biodegradability, reduce the difficulty of subsequent wastewater treatment and improve the wastewater treatment efficiency.

[0040] like Figure 5-1 and Figure 5-2 As shown, the Phoredox tank 5 mainly consists of a pre-anaerobic tank 13, an anaerobic tank 14, an anoxic tank I 15, an aerobic tank I 16, an anoxic tank II 17, an aerobic tank II 18, and an MBR membrane tank 19 connected in sequence. Submersible mixers 11 are installed in the pre-anaerobic tank 13, anaerobic tank 14, anoxic tank I 15, and anoxic tank II 17. Driven by a motor, the impeller rotates, converting the kinetic energy of the water into mechanical energy. This causes the impeller to drive the surrounding water to generate strong circulation and tangential flow, thereby achieving the purpose of mixing, stirring, and propulsing wastewater. Aerobic tanks I16 and II18 are equipped with aeration devices II21. Aeration device II21 includes a blower and a liftable tube aerator. The blower is an air-suspended blower, typically installed in the blower equipment room. The liftable tube aerator consists of an air supply pipe and a rubber membrane tube, achieving efficient gas-liquid mixing, improving the oxygen utilization rate of the aerobic tank, and allowing direct lifting to the water surface for maintenance. Cleaning or replacement can be completed without emptying the tank, reducing manual maintenance costs. The submersible mixer 11 can thoroughly mix chemical wastewater, and the aeration device II21 can simultaneously mix the wastewater and dissolve sufficient oxygen in the wastewater in the aerobic tank, improving the treatment efficiency of COD and ammonia nitrogen.

[0041] The MBR membrane tank 19 is equipped with an MBR membrane module 20. The membrane tank can maintain a high concentration of activated sludge, increase the organic load of biological treatment, thereby reducing the footprint of the wastewater treatment facility and reducing the amount of residual sludge by maintaining a low sludge load.

[0042] like Figure 6-1 and Figure 6-2 As shown, the Fenton reactor 6 is equipped with a mechanical stirring device 22. Concentrated sulfuric acid, hydrogen peroxide, and ferrous sulfate are added to the Fenton reactor 6. The mechanical stirring device 22 mixes the reagents and wastewater, and the reaction can further remove organic matter that is difficult to biochemically treat from the wastewater.

[0043] A neutralization aeration tank 23 is installed between the Fenton reactor 6 and the final settling tank 7, and an aeration and stirring device 24 is installed in the neutralization aeration tank 23. The wastewater from the Fenton reactor 6 then enters the neutralization aeration tank 23, where sodium hydroxide is added to adjust the pH, and the carbon dioxide produced by the Fenton reaction is removed by the aeration and stirring device 24 to avoid affecting the subsequent settling process.

[0044] like Figure 7-1 and Figure 7-2As shown, the final settling tank 7 mainly consists of a coagulation tank 25, a flocculation tank 26, and a sedimentation tank 27 connected in sequence. Both the coagulation tank 25 and the flocculation tank 26 are equipped with mechanical stirring devices 22, while the sedimentation tank 27 is equipped with a sludge scraping device 28 and an effluent weir 29. PAC is added to the coagulation tank 25, and after high-intensity stirring by the mechanical stirring device 22 for 3 minutes, the coagulant and raw water are rapidly mixed, destabilizing fine particles in the water and forming visible flocs. Anionic PAM is added to the flocculation tank 26, and with moderate stirring and sufficient retention time (usually 15-35 minutes), dense flocs are formed, significantly improving settling efficiency. The wastewater after dosing, mixing, and flocculation flows into the sedimentation tank 27. During horizontal flow, the flocs settle to the sludge zone at the bottom of the tank. The sludge scraping device 28 continuously scrapes the sludge to the sludge hopper, continuously accumulating and concentrating it, and periodically discharging it. The discharged sludge is then conditioned and filtered before being transported off-site. The clarified water after sedimentation flows out through the outlet weir 29 on the surface of the pool.

[0045] like Figure 8 As shown, the vertical space within the denitrification filter 8 is vertically arranged with quartz sand 30, pebbles 31, filter bricks 32, and an aeration system 33, from top to bottom. The filter media are arranged in a gradient from small to large at the bottom. The surface layer traps suspended solids, while the bottom layer completes the biological denitrification reaction (under facultative-anaerobic conditions, by adding an appropriate amount of carbon source, the denitrifying bacteria attached to the surface of the quartz sand 30 convert nitrate nitrogen into nitrogen gas). Filter bricks 32 support the installation of the filter media and improve the uniformity of air-water distribution. The aeration system 33, through combined air-water flushing, effectively removes blockages from the filter media layer, restoring the filter's filtration performance.

[0046] like Figure 9 As shown, the disinfection tank 9 is equipped with multiple guide walls 34, which can effectively improve the mixing efficiency of wastewater and disinfectant.

[0047] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent.

Claims

1. A chemical wastewater treatment system, characterized in that: The system includes a fine screen channel, equalization tank, ozone oxidation tank, hydrolysis acidification tank, Phoredox tank, Fenton reactor, final sedimentation tank, denitrification filter, and disinfection tank, which are connected in sequence. The Phoredox tank mainly consists of a pre-anaerobic tank, anaerobic tank, anoxic tank I, aerobic tank I, anoxic tank II, aerobic tank II, and MBR membrane tank, which are connected in sequence. The final sedimentation tank mainly consists of a coagulation tank, flocculation tank, and sedimentation tank, which are connected in sequence.

2. The chemical wastewater treatment system according to claim 1, characterized in that: The fine screen channel is equipped with a solid-liquid separation device.

3. The chemical wastewater treatment system according to claim 1, characterized in that: Submersible mixers are installed in the equalization tank, hydrolysis acidification tank, pre-anaerobic tank, anaerobic tank, anoxic tank I and anoxic tank II.

4. The chemical wastewater treatment system according to claim 1, characterized in that: The ozone oxidation tank is equipped with an aeration device I.

5. The chemical wastewater treatment system according to claim 1, characterized in that: Aeration device II is installed in aerobic tank I and aerobic tank II.

6. The chemical wastewater treatment system according to claim 1, characterized in that: The MBR membrane tank is equipped with an MBR membrane module.

7. The chemical wastewater treatment system according to claim 1, characterized in that: The Fenton reaction tank, coagulation tank, and flocculation tank are all equipped with mechanical stirring devices.

8. The chemical wastewater treatment system according to claim 1, characterized in that: A neutralization aeration tank is provided between the Fenton reaction tank and the final settling tank, and an aeration and stirring device is provided in the neutralization aeration tank.

9. The chemical wastewater treatment system according to claim 1, characterized in that: The sedimentation tank is equipped with a sludge scraping device and an outlet weir.

10. The chemical wastewater treatment system according to claim 1, characterized in that: The denitrification filter is equipped with quartz sand, pebbles, filter bricks and an aeration system from top to bottom.

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