High-salinity wastewater treatment system matched with production of ethylene oxide and ethylene glycol

Abstract

The utility model relates to the field of ethylene oxide and ethylene glycol production sewage treatment, and discloses a high-salt wastewater treatment system matched with ethylene oxide and ethylene glycol production for use, which comprises a high-salt regulating tank (22), an anoxic tank (23), a high-salt CBR tank (24), a high-salt ASR tank (25) and a high-salt secondary sedimentation tank (26) which are sequentially connected, and the high-salt secondary sedimentation tank (26) is connected with a final sedimentation tank (27); the sewage treatment system realizes high-efficiency treatment of high-salinity wastewater in ethylene oxide and ethylene glycol production, and is high in treatment efficiency and stable in operation; meanwhile, the reclaimed water recycling system (20) is matched for recycling clean water at multiple positions, so that water is saved, emission is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment in the production of ethylene oxide and ethylene glycol, specifically to a high-salt wastewater treatment system for use in the production of ethylene oxide and ethylene glycol. Background Technology

[0002] Ethylene glycol and ethylene oxide (EO and EG) are important raw materials for polyester production in chemical fiber enterprises. The main production technology related to ethylene oxide / ethylene glycol is the ethylene oxidation method, which uses ethylene and oxygen as raw materials to produce ethylene oxide (EO). EO is then converted to ethylene glycol (EG) through traditional hydration or catalytic hydrolysis. This production process continuously discharges large amounts of wastewater. This wastewater has a high concentration of organic matter, a high pH value, and a wide range of water quality fluctuations; it has a low concentration of dissolved solids; it is basically free of biologically toxic pollutants, and its BOD / COD ratio is between 0.4 and 0.6, making it suitable for biological treatment and reuse.

[0003] Existing technology, such as Chinese utility model patent application number CN201120138628.X, discloses an ethylene glycol wastewater treatment device, mainly composed of a collection well, a hydrolysis acidification tank, a biological fluidized bed reactor, a water purifier, and a clear water tank. This utility model device has low investment and low operating costs, but its treatment capacity is relatively low and its operation is not stable enough. From the perspectives of technological development trends and occupational safety and health, how to reduce wastewater discharge, lower enterprise production costs, improve the operating environment of wastewater treatment processes, and enhance the operational stability of treatment devices has become an urgent problem for chemical enterprises to solve. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a high-salt wastewater treatment system for ethylene oxide and ethylene glycol production. This wastewater treatment system achieves efficient treatment of high-salt wastewater from ethylene oxide and ethylene glycol production, with high treatment efficiency and stable operation. At the same time, it is combined with a greywater reuse system for multiple clean water reuses, saving water and reducing emissions, thus lowering operating costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production includes a high-salinity equalization tank, an anoxic tank, a high-salinity CBR tank, a high-salinity ASR tank, and a high-salinity secondary sedimentation tank connected in sequence. The high-salinity secondary sedimentation tank is connected to a final sedimentation tank to achieve high-salinity wastewater treatment.

[0007] As a preferred embodiment, it also includes a waste alkali solution tank, which is connected to a high-salt conditioning tank. The waste alkali solution is treated in the waste alkali solution tank and then enters the high-salt conditioning tank.

[0008] Preferably, the high-salt conditioning tank is equipped with a sludge suction device, which is connected to the sludge tank to recycle and treat the high-salt sludge.

[0009] Preferably, the final settling tank includes a coagulation reaction zone, a settling zone, and an effluent zone. The clear water at the top of the coagulation reaction zone is connected to the settling zone, the clear water at the top of the settling zone is connected to the effluent zone, and the sludge at the bottom of the settling zone is connected to a sludge tank so that the sludge can be discharged through the sludge tank.

[0010] Preferably, the effluent from the settling zone is sequentially connected to an ozone reaction tank, a high-salt post-CBR tank, and an effluent discharge tank. The effluent from the discharge tank is connected to the outlet of the sewage treatment plant and is discharged after passing the test.

[0011] Preferably, the ozone reaction tank includes at least three tanks, with a first circulating water device between adjacent tanks to achieve wastewater circulation treatment between the tanks.

[0012] Preferably, the effluent from the sludge tank is connected to a collection tank, and the effluent from the collection tank is reused in a greywater recycling system. The sludge at the bottom of the collection tank is connected to a screw press via a pump body to dewater the sludge before it is discharged.

[0013] Preferably, the screw press is connected to a filtrate tank, and the effluent from the filtrate tank is reused in a greywater recycling system.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model's wastewater treatment system achieves efficient treatment of high-salt wastewater from ethylene oxide and ethylene glycol production, with high treatment efficiency and stable operation; at the same time, it is combined with a greywater reuse system for multiple clean water reuses, saving water and reducing emissions, thus lowering operating costs. Attached Figure Description

[0016] Figure 1 This is a flowchart of the high-salinity wastewater treatment system.

[0017] Figure 2 This is a partial process flow of the high-salinity wastewater treatment system. Figure 1 .

[0018] Figure 3 This is a partial process flow of the high-salinity wastewater treatment system. Figure 2 .

[0019] Figure 4 This is a partial process flow of the high-salinity wastewater treatment system. Figure 3 .

[0020] Figure 5 This is the overall flow diagram of the wastewater treatment system.

[0021] In the attached diagram: 21-Waste alkaline solution tank, 22-High-salt equalization tank, 221-Sludge suction device, 23-Anoxic tank, 24-High-salt CBR tank, 25-High-salt ASR tank, 26-High-salt secondary sedimentation tank, 27-Final sedimentation tank, 271-Coagulation reaction zone, 272-Sedimentation zone, 273-Effluent zone, 28-Ozone reaction tank, 281-First circulating water equipment, 29-High-salt post-CBR tank, 291-Discharge tank; 30-Grey water reuse system, 4-Sludge tank, 5-Hard sludge removal tank, 6-Plate and frame filter press, 7-Filtration tank, 8-Collection tank, 9-Screw press. Detailed Implementation

[0022] Example 1: A preferred embodiment of this utility model provides a high-salt wastewater treatment system for ethylene oxide and ethylene glycol production, including a high-salt equalization tank 22, an anoxic tank 23, a high-salt CBR tank 24, a high-salt ASR tank 25, and a high-salt secondary sedimentation tank 26 connected in sequence. The high-salt secondary sedimentation tank 26 is connected to a final sedimentation tank 27 to achieve high-salt wastewater treatment. It also includes a waste alkali liquid tank 21, which is connected to the high-salt equalization tank 22. The waste alkali liquid is treated in the waste alkali liquid tank 21 and then enters the high-salt equalization tank 22. The high-salt equalization tank 22 is equipped with a sludge suction device 221, which is connected to a sludge tank 4 to recover and treat the high-salt sludge.

[0023] Example 2: A preferred embodiment of this utility model provides a high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production, which differs from the above embodiment only in that:

[0024] The final settling tank 27 includes a coagulation reaction zone 271, a settling zone 272, and an effluent zone 273. The clear water at the top of the coagulation reaction zone 271 is connected to the settling zone 272, and the clear water at the top of the settling zone 272 is connected to the effluent zone 273. The sludge at the bottom of the settling zone 272 is connected to a sludge tank 4 so that the sludge can be discharged through the sludge tank 4.

[0025] The effluent from the settling zone 272 is sequentially connected to the ozone reaction tank 28, the high-salt post-CBR tank 29, and the discharge tank 291. The effluent from the discharge tank 291 is connected to the outlet of the sewage treatment plant and is discharged after passing the test.

[0026] The ozone reaction tank 28 includes at least three tanks, and a first circulating water device is provided between adjacent tanks to realize the circulation and treatment of sewage between the tanks.

[0027] Example 3: A preferred embodiment of this utility model provides a high-salt wastewater treatment system for ethylene oxide and ethylene glycol production. The only difference between this system and the above embodiment is that: the effluent from the sludge tank 4 is connected to the collection tank 8, and the effluent from the collection tank 8 is reused in the greywater reuse system 20. The sludge at the bottom of the collection tank 8 is connected to the screw press 9 via a pump body to dewater the sludge before discharge. The filter water from the screw press 9 is connected to the filtrate tank 7, and the effluent from the filtrate tank 7 is reused in the greywater reuse system 20.

[0028] This wastewater treatment system achieves efficient treatment of high-salt wastewater from ethylene oxide and ethylene glycol production, with high treatment efficiency and stable operation. At the same time, it is combined with a greywater reuse system for multiple clean water reuses, saving water and reducing emissions, thus lowering operating costs.

[0029] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A high-salinity wastewater treatment system for use in the production of ethylene oxide and ethylene glycol, characterized in that, The system includes a high-salt equalization tank (22), an anoxic tank (23), a high-salt CBR tank (24), a high-salt ASR tank (25), and a high-salt secondary sedimentation tank (26) connected in sequence. The high-salt secondary sedimentation tank (26) is connected to a final sedimentation tank (27). The final sedimentation tank (27) includes a coagulation reaction zone (271), a settling zone (272), and an effluent zone (273). The clear water at the top of the coagulation reaction zone (271) is connected to the settling zone (272), and the clear water at the top of the settling zone (272) is connected to the effluent zone (273). The sludge at the bottom of the settling zone (272) is connected to a sludge tank (4) so ​​that the sludge can be discharged through the sludge tank (4) to achieve high-salt wastewater treatment.

2. The high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 1, characterized in that, It also includes a waste alkali solution tank (21), which is connected to a high-salt conditioning tank (22). The waste alkali solution is treated in the waste alkali solution tank (21) and then enters the high-salt conditioning tank (22).

3. The high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 2, characterized in that, The high-salt conditioning tank (22) is equipped with a sludge suction device (221), which is connected to the sludge tank (4) to recycle and process the high-salt sludge.

4. The high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production as described in claim 1, characterized in that, The effluent from the settling zone (272) is sequentially connected to the ozone reaction tank (28), the high-salt post-CBR tank (29), and the discharge tank (291). The effluent from the discharge tank (291) is connected to the outlet of the sewage treatment plant and is discharged after passing the test.

5. A high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production as described in claim 4, characterized in that, The ozone reaction tank (28) includes at least three tanks, and a first circulating water device (281) is provided between adjacent tanks to realize the sewage circulation treatment between the tanks.

6. A high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production as described in claim 3 or 4, characterized in that, The sludge tank (4) is connected to the water collection tank (8) for effluent. The effluent from the water collection tank (8) is reused in the greywater recycling system (20). The sludge at the bottom is connected to the screw press (9) via a pump body to dewater the sludge before it is discharged.

7. A high-salinity wastewater treatment system for ethylene oxide and ethylene glycol production as described in claim 6, characterized in that, The screw press (9) filters water and connects to the filtrate tank (7). The effluent from the filtrate tank (7) is recycled to the greywater recycling system (20) to reuse the filtered water.

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