Coke quenching wastewater treatment device and treatment process

Abstract

The invention relates to a coke quenching wastewater device which comprises a coagulation treatment system and a coagulation sludge treatment system, the coagulation treatment system comprises a coke quenching tank, a coagulation reaction tank, a horizontal sedimentation tank, a lift pump, a stirrer, a horizontal sedimentation tank mud scraper, a sludge lift pump and a dosing device, the coagulation sludge treatment system comprises a sludge concentration tank, a sludge concentration tank sludge scraper, a sludge dewatering machine, a sludge dewatering machine feeding pump and a cation PAM dosing device.The device is a self-designed coke quenching wastewater treatment device, is provided with the coagulation treatment system and the coagulation sludge treatment system, and has the characteristics of easy operation, simple process and low energy consumption; the problems of low suspended matter removal rate, high sludge treatment cost and the like are solved, and the problems of high operation cost, poor COD (Chemical Oxygen Demand), chromaticity and total cyanide removal efficiency and the like are solved. Sulfide, COD, ammonia nitrogen, cyanide and volatile phenol in water are effectively removed, it is guaranteed that water quality meets the national environmental protection standard, the PH of coke quenching wastewater is adjusted, and corrosion to related equipment is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection in coking production, and relates to a quenching wastewater treatment device and a treatment process. Background Art

[0002] The blended coal prepared according to certain indexes is tamped into a coal cake and then loaded into the coking chamber of the coke oven by a coal charging car for heating in an airtight manner. After going through stages such as drying, pyrolysis, melting, binding, solidification, and shrinkage, the center temperature of the coke cake reaches about 1000 ± 50 °C, and finally coke is obtained. When there are abnormalities in dry quenching coke production, the coke oven needs to maintain a normal production rhythm. Therefore, the red-hot coke needs to be water quenched, and a certain amount of water is used to extinguish the hot red coke to obtain coke with relatively low moisture content. The water after quenching contains a certain amount of sulfides, COD, ammonia nitrogen, cyanides, volatile phenols, and the pH of the quenching wastewater must be alkaline to reduce the corrosion of relevant equipment. At the same time, the coke dust, ash, etc. in the quenching wastewater will cause the turbidity of the quenching wastewater to rise.

[0003] During the production process of the coke oven, due to the influence of the dry quenching coke device, there will be a situation of water quenching coke. After the coke is water quenched, the water mixed with part of the coke flows into the quenching pond. Due to the influence of the coke, the pH, sulfides, COD, ammonia nitrogen, cyanides, and volatile phenols in the quenching wastewater will increase accordingly. Therefore, to ensure that the water quality in the quenching pond meets the national environmental protection standards, the water quality in the quenching pond must be treated. Moreover, the pH, sulfides, COD, ammonia nitrogen, cyanides, and volatile phenols in the quenching wastewater cannot be adjusted. Therefore, research is carried out on the quenching wastewater treatment process, and a treatment process that conforms to the current situation of the quenching wastewater of our company is invented. Summary of the Invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art, solve the problems that the suspended substances in the treatment of quenching wastewater are not thoroughly removed, the sulfides, COD, ammonia nitrogen, cyanides, and volatile phenols in the water cannot be adjusted, the quenching wastewater will corrode relevant equipment, and the sludge disposal cost is high, and provide a quenching wastewater treatment device and a treatment process.

[0005] The invention is realized through the following technical solutions: A quenching wastewater treatment device includes a coagulation treatment system and a coagulation sludge treatment system. The coagulation treatment system includes a quenching pond, a coagulation reaction tank, a horizontal flow sedimentation tank, a lift pump, a stirrer, a sludge scraper for the horizontal flow sedimentation tank, a sludge lift pump, and a chemical dosing device. The quenching pond consists of a first sedimentation tank, a second sedimentation tank, a third sedimentation tank, and a clear water tank. The quenching wastewater enters the first sedimentation tank and then overflows into the second sedimentation tank and the third sedimentation tank in sequence. A lift pump is arranged beside the third sedimentation tank. The lift pump sends the quenching wastewater to the coagulation reaction tank through a pipeline. A chemical dosing device is arranged on the coagulation reaction tank. The chemical dosing device consists of a coagulation and de-cyanation agent dosing device, an anionic polyacrylamide dosing device, and an activated carbon dosing device. A stirrer is arranged at the upper part of the coagulation reaction tank. The coagulation reaction tank is connected to the horizontal flow sedimentation tank through a pipeline. A sludge scraper for the horizontal flow sedimentation tank is arranged at the top of the horizontal flow sedimentation tank. A sludge lift pump is arranged beside the horizontal flow sedimentation tank. The sludge scraper for the horizontal flow sedimentation tank is connected to the inlet of the sludge lift pump. The sludge lift pump lifts the sludge deposited at the bottom of the tank and sends it to the sludge thickening tank. The horizontal flow sedimentation tank is connected to the clear water tank group through a pipeline. The coagulation sludge treatment system includes a sludge thickening tank, a sludge scraper for the sludge thickening tank, a sludge dewatering machine, a sludge dewatering machine feed pump, and a cationic PAM dosing device. The sludge thickening tank is connected to the outlet of the sludge lift pump. A cationic PAM dosing device is arranged on the sludge thickening tank. A sludge scraper for the sludge thickening tank is arranged at the top of the sludge thickening tank. The screw at the bottom of the sludge scraper for the sludge thickening tank stirs the sludge at the bottom of the sludge thickening tank. The inlet pipeline of the sludge dewatering machine feed pump is arranged at the bottom of the sludge thickening tank. The sludge dewatering machine feed pump is connected to the sludge dewatering machine and sends the sludge at the bottom of the sludge thickening tank to the sludge dewatering machine for dewatering.

[0006] Preferably, the coagulation reaction tank is internally partitioned and consists of a first coagulation reaction tank, a second coagulation reaction tank, a third coagulation reaction tank, and a fourth coagulation reaction tank.

[0007] Preferably, there are 4 stirrers, which are respectively arranged at the upper parts of the first coagulation reaction tank, the second coagulation reaction tank, the third coagulation reaction tank, and the fourth coagulation reaction tank. The stirrers are vertical stirrers, and the stirring speed is 10 - 80 rpm.

[0008] Preferably, the designed flow rate of the lift pump is 150 - 300 m 3 / h, the designed temperature is 100 - 110 °C, the designed head is 10 - 25 meters, and a filtering device and an aeration device are arranged at the inlet of the lift pump.

[0009] Preferably, the height of the overflow weir between the first sedimentation tank and the second sedimentation tank, and between the second sedimentation tank and the third sedimentation tank is 4 meters, and the height difference of the overflow weir between the third sedimentation tank and the clear water tank is not less than 4.5 meters.

[0010] Preferably, the designed linear velocity of the sludge scraper in the horizontal flow sedimentation tank is 0.5 - 2 m / min.

[0011] The coke quenching wastewater treatment process of the present invention comprises the following steps: S1. After the coke quenching wastewater enters the coke quenching tank, it sequentially overflows through the first sedimentation tank, the second sedimentation tank, and the third sedimentation tank; S2. The coke quenching wastewater in the third sedimentation tank is sent to the inlet of the coagulation reaction tank through a pipeline by a lift pump. After the coke quenching wastewater enters the first coagulation reaction tank, it sequentially enters the second coagulation reaction tank, the third coagulation reaction tank, and the fourth coagulation reaction tank through the gravity inlet. The coagulation de-cyaniding agent dosing device, the anionic polyacrylamide dosing device, and the activated carbon dosing device above the coagulation reaction tank send the agents into the upper part of the coagulation reaction tank through pipelines to react with the coke quenching wastewater. The stirrers in the upper part of the coagulation reaction tank are set with different stirring speeds according to the inlet water sequence to fully mix and react the agents with the coke quenching wastewater; S3. The coke quenching wastewater after the mixing reaction flows by gravity to the bottom of the horizontal flow sedimentation tank, and the muddy water is separated by reducing the flow rate. The separated supernatant enters the clear water tank by gravity through the pipeline at the outlet of the horizontal flow sedimentation tank. The sludge separated is sent to the inlet of the sludge lift pump by the reciprocating movement of the sludge scraper in the horizontal flow sedimentation tank, and the sludge is lifted to the sludge thickening tank by the sludge lift pump; S4. The sludge feed pump of the sludge dehydrator sends the sludge in the sludge thickening tank to the sludge dehydrator for sludge dewatering treatment. The cationic PAM dosing device sends the agent into the sludge thickening tank through a pipeline to react with the sludge. The supernatant generated by the dewatering returns to the horizontal flow sedimentation tank for cyclic treatment according to step S3, and the dewatered sludge is sent to the coal yard for coal blending use.

[0012] Preferably, the clear water in the clear water tank in step S3 is sent into the coke quenching tank by a coke quenching pump to complete the next round of coke quenching, and the coke quenching wastewater after coke quenching is cyclically treated according to steps S1 - S4.

[0013] Preferably, sodium hypochlorite agent is added when the supernatant enters the clear water tank by gravity through the pipeline at the outlet of the horizontal flow sedimentation tank in step S3.

[0014] By the above technical solution, the beneficial effects of the present invention are as follows: The present invention is a self-designed coke quenching wastewater treatment device, provided with a coagulation treatment system and a coagulation sludge treatment system, having the characteristics of easy operation, simple process, and low energy consumption, and solving the problems of low suspended solid removal rate and high sludge disposal cost, etc.

[0015] Solve the problems of high operating costs and poor removal efficiency of COD, chromaticity, and total cyanide. Effectively remove sulfides, COD, ammonia nitrogen, cyanide, and volatile phenols in water, ensure that the water quality meets national environmental protection standards, adjust the pH of the coke quenching wastewater, and avoid corrosion of related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the process flow diagram of the coke quenching wastewater treatment device of the present invention; Figure 2 is the internal structure schematic diagram of the coagulation reaction tank of the present invention.

[0017] The description of the reference numerals in the drawings is as follows: 1, coke quenching tank; 2, coagulation reaction tank; 3, horizontal flow sedimentation tank; 4, lift pump; 5, stirrer; 6, chemical dosing device; 7, sludge scraper of horizontal flow sedimentation tank; 8, sludge lift pump; 9, first sedimentation tank; 10, second sedimentation tank; 11, third sedimentation tank; 12, clear water tank; 13, sludge thickening tank; 14, sludge scraper of sludge thickening tank; 15, sludge dewatering machine; 16, sludge dewatering machine feed pump; 17, cationic PAM dosing device; 18, coagulation de-cyaniding agent dosing device; 19, anionic polyacrylamide dosing device; 20, activated carbon dosing device; 21, first coagulation reaction tank; 22, second coagulation reaction tank; 23, third coagulation reaction tank; 24, fourth coagulation reaction tank. DETAILED DESCRIPTION OF THE INVENTION

[0018] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1As shown in the figure, a quenching wastewater treatment device includes a coagulation treatment system and a coagulation sludge treatment system. The coagulation treatment system includes a quenching pond 1, a coagulation reaction tank 2, a horizontal flow sedimentation tank 3, a lift pump 4, a stirrer 5, a dosing device 6, a horizontal flow sedimentation tank sludge scraper 7, and a sludge lift pump 8. The quenching pond 1 is composed of a first sedimentation tank 9, a second sedimentation tank 10, a third sedimentation tank 11, and a clear water tank 12. After the quenching wastewater enters the first sedimentation tank 9, it overflows into the second sedimentation tank 10 and the third sedimentation tank 11 in sequence. A lift pump 4 is arranged beside the third sedimentation tank 11. The lift pump 4 sends the quenching wastewater to the coagulation reaction tank 2 through a pipeline. A dosing device 6 is arranged on the coagulation reaction tank 2. The dosing device 6 is composed of a coagulation de-cyaniding agent dosing device 18, an anionic polyacrylamide dosing device 19, and an activated carbon dosing device 20. A stirrer 5 is arranged at the upper part of the coagulation reaction tank 2. The coagulation reaction tank 2 is connected to the horizontal flow sedimentation tank 3 through a pipeline. A horizontal flow sedimentation tank sludge scraper 7 is arranged at the top of the horizontal flow sedimentation tank 3. A sludge lift pump 8 is arranged beside the horizontal flow sedimentation tank 3. The horizontal flow sedimentation tank sludge scraper 7 is connected to the inlet of the sludge lift pump 8. The sludge lift pump 8 lifts the sludge deposited at the bottom of the tank and sends it to the sludge thickening tank 13. The horizontal flow sedimentation tank 3 is connected to the clear water tank 12 through a pipeline; The coagulation sludge treatment system includes a sludge thickening tank 13, a sludge thickening tank sludge scraper 14, a sludge dehydrator 15, a sludge dehydrator feed pump 16, and a cationic PAM dosing device 17. The sludge thickening tank 13 is connected to the outlet of the sludge lift pump 8. A cationic PAM dosing device 17 is arranged on the sludge thickening tank 13. A sludge thickening tank sludge scraper 14 is arranged at the top of the sludge thickening tank 13. The screw at the bottom of the sludge thickening tank sludge scraper 14 stirs the sludge at the bottom of the sludge thickening tank 13. The inlet pipeline of the sludge dehydrator feed pump 16 is arranged at the bottom of the sludge thickening tank 13. The sludge dehydrator feed pump 16 is connected to the sludge dehydrator 15 to send the sludge at the bottom of the sludge thickening tank 13 to the sludge dehydrator 15 for dehydration.

[0021] In this embodiment, the coagulation reaction tank 2 is internally partitioned and is composed of a first coagulation reaction tank 21, a second coagulation reaction tank 22, a third coagulation reaction tank 23, and a fourth coagulation reaction tank 24.

[0022] In this embodiment, there are 4 stirrers 5, which are respectively arranged at the upper parts of the first coagulation reaction tank 21, the second coagulation reaction tank 22, the third coagulation reaction tank 23, and the fourth coagulation reaction tank 24. The stirrers 5 are vertical stirrers, and the stirring speed is 10 - 80 rpm, which can make the quenching wastewater and the medicament fully mixed.

[0023] In this embodiment, the designed flow rate of the lift pump 4 is 150 - 300 m 3 / h, the designed temperature is 100 - 110 °C, and the designed head is 10 - 25 meters. It can ensure the stable operation ability of the lift pump when there is an accident in the coke dry quenching and when the water temperature in the full water quenching pool is high. A filtering device and an aeration device are arranged at the inlet of the lift pump 4. When it is found that the flow rate of the lift pump 4 decreases, the aeration valve is opened to blow away the blocked coke at the water suction port of the lift pump 4.

[0024] In this embodiment, the overflow height between the first sedimentation tank 9 and the second sedimentation tank 10, and between the second sedimentation tank 10 and the third sedimentation tank 11 is 4 meters, and the height difference of the overflow between the third sedimentation tank 11 and the clear water tank 12 is not less than 4.5 meters.

[0025] In this embodiment, the designed linear speed of the sludge scraper 7 of the horizontal flow sedimentation tank is 0.5 - 2 m / min.

[0026] The coke quenching wastewater treatment process of the present invention includes the following steps: S1. After the coke quenching wastewater enters the coke quenching pool 1, it overflows and passes through the first sedimentation tank 9, the second sedimentation tank 10, and the third sedimentation tank 11 in sequence; the coke quenching wastewater first enters the first sedimentation tank 9, and large particles of coke fall to the bottom of the first sedimentation tank 9 under the action of gravity. The coke quenching wastewater after the first sedimentation overflows and enters the second sedimentation tank 10, where relatively medium-sized coke is separated under the action of gravity. Then, the coke quenching wastewater after precipitation overflows and enters the third sedimentation tank 11, where finer particles of coke are separated by precipitation again. S2. The coke quenching wastewater in the third sedimentation tank 11 is sent to the inlet of the coagulation reaction tank 2 through a pipeline by the lift pump 4. After the coke quenching wastewater enters the first coagulation reaction tank 21, it enters the second coagulation reaction tank 22, the third coagulation reaction tank 23, and the fourth coagulation reaction tank 24 in sequence through the gravity inlet. The total residence time is about 40 minutes. The coagulation de-cyaniding agent dosing device 18, the anionic polyacrylamide dosing device 19, and the activated carbon dosing device 20 above the coagulation reaction tank 2 send the medicaments into the upper part of the coagulation reaction tank 2 through pipelines to react with the coke quenching wastewater. The stirrers 5 in the upper part of the coagulation reaction tank 2 are set at different stirring speeds according to the water inlet sequence to fully mix and react the medicaments with the coke quenching wastewater; the main purpose of the full mixing and reaction of the medicaments with the coke quenching wastewater is to form larger flocs of the suspended solids in the coke quenching wastewater so as to facilitate separation from the wastewater. S3. After the mixed and reacted coke quenching wastewater undergoes flocculation reaction, it flows by gravity to the bottom of the horizontal flow sedimentation tank 3, and the muddy water is separated by reducing the flow rate. The separated supernatant enters the clear water tank 12 by gravity through the pipeline at the water outlet of the horizontal flow sedimentation tank 3. The separated sludge is sent to the inlet of the sludge lift pump 8 by the reciprocating movement of the sludge scraper 7 of the horizontal flow sedimentation tank, and the sludge is lifted to the sludge thickening tank 13 by the sludge lift pump 8. S4. The sludge feed pump 16 of the sludge dehydrator sends the sludge in the sludge thickening tank 13 to the sludge dehydrator 15 through a pipeline for sludge dewatering treatment. The cationic PAM dosing device 17 sends the reagent into the sludge thickening tank 13 through a pipeline to react with the sludge. The supernatant produced by dewatering is returned to the horizontal flow sedimentation tank 3 for cyclic treatment according to step S3. The dewatered sludge is sent to the coal yard for coal blending and use, and the blended combustion of sludge with coal reduces the disposal cost.

[0027] In this embodiment, the clear water in the clear water tank 12 in step S3 is sent into the coke quenching tank by the coke quenching pump to complete the next round of coke quenching. The quenching wastewater after coke quenching is cyclically treated according to steps S1 - S4 to realize the reuse of resources.

[0028] In this embodiment, when the supernatant in step S3 enters the clear water tank 12 by gravity through the pipeline at the water outlet of the horizontal flow sedimentation tank 3, sodium hypochlorite reagent is added, which can effectively remove ammonia nitrogen and ensure the water quality index of the effluent.

[0029] Through the above treatment, the sulfide, COD, ammonia nitrogen, cyanide, and volatile phenol in the quenching wastewater are reduced, and the pH value of the quenching wastewater is adjusted so that the above data are all within the water quality treatment index requirements of the country.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A quenching wastewater treatment device, comprising a coagulation treatment system and a coagulation sludge treatment system. The coagulation treatment system includes a quenching pond (1), a coagulation reaction tank (2), a horizontal flow sedimentation tank (3), a lift pump (4), a stirrer (5), a chemical dosing device (6), a horizontal flow sedimentation tank sludge scraper (7), and a sludge lift pump (8). The quenching pond (1) consists of a first sedimentation tank (9), a second sedimentation tank (10), a third sedimentation tank (11), and a clear water tank (12). After the quenching wastewater enters the first sedimentation tank (9), it overflows into the second sedimentation tank (10) and the third sedimentation tank (11) in sequence. A lift pump (4) is arranged beside the third sedimentation tank (11), and the lift pump (4) sends the quenching wastewater to the coagulation reaction tank (2) through a pipeline. A chemical dosing device (6) is arranged on the coagulation reaction tank (2). The chemical dosing device (6) consists of a coagulation de-cyaniding agent dosing device (18), an anionic polyacrylamide dosing device (19), and an activated carbon dosing device (20). A stirrer (5) is arranged on the upper part of the coagulation reaction tank (2). The coagulation reaction tank (2) is connected to the horizontal flow sedimentation tank (3) through a pipeline. A horizontal flow sedimentation tank sludge scraper (7) is arranged on the top of the horizontal flow sedimentation tank (3). A sludge lift pump (8) is arranged beside the horizontal flow sedimentation tank (3). The horizontal flow sedimentation tank sludge scraper (7) is connected to the inlet of the sludge lift pump (8), and the sludge lift pump (8) lifts the sludge deposited at the bottom of the tank and sends it to the sludge thickening tank (13). The horizontal flow sedimentation tank (3) is connected to the clear water tank (12) through a pipeline. The coagulation sludge treatment system includes a sludge thickening tank (13), a sludge thickening tank sludge scraper (14), a sludge dehydrator (15), a sludge dehydrator feed pump (16), and a cationic PAM dosing device (17). The sludge thickening tank (13) is connected to the outlet of the sludge lift pump (8). A cationic PAM dosing device (17) is arranged on the sludge thickening tank (13). A sludge thickening tank sludge scraper (14) is arranged on the top of the sludge thickening tank (13). The screw at the bottom of the sludge thickening tank sludge scraper (14) stirs the sludge at the bottom of the sludge thickening tank (13). The inlet pipeline of the sludge dehydrator feed pump (16) is arranged at the bottom of the sludge thickening tank (13). The sludge dehydrator feed pump (16) is connected to the sludge dehydrator (15) to send the sludge at the bottom of the sludge thickening tank (13) to the sludge dehydrator (15) for dehydration.

2. The coking wastewater treatment device according to claim 1, characterized in that The coagulation reaction tank (2) is internally partitioned and consists of a first coagulation reaction tank (21), a second coagulation reaction tank (22), a third coagulation reaction tank (23), and a fourth coagulation reaction tank (24).

3. The coke quenching wastewater treatment device according to claim 2, characterized in that There are 4 stirrers (5), which are respectively arranged on the upper parts of the first coagulation reaction tank (21), the second coagulation reaction tank (22), the third coagulation reaction tank (23), and the fourth coagulation reaction tank (24). The stirrers (5) are vertical stirrers, and the stirring speed is 10 - 80 rpm.

4. A coke quenching wastewater treatment device according to claim 1, characterized in that, The designed flow rate of the lift pump (4) is 150 - 300 m 3 / h, the designed temperature is 100 - 110 °C, and the designed head is 10 - 25 meters. A filtering device and an aeration device are arranged at the inlet of the lift pump (4).

5. The coke quenching wastewater treatment device according to claim 1, characterized in that The overflow height between the first sedimentation tank (9) and the second sedimentation tank (10), and between the second sedimentation tank (10) and the third sedimentation tank (11) is 4 meters, and the height difference of the overflow between the third sedimentation tank (11) and the clear water tank (12) is not less than 4.5 meters.

6. The coke quenching wastewater treatment device according to claim 1, characterized in that, The designed linear speed of the sludge scraper in the horizontal flow sedimentation tank (7) is 0.5 - 2 m / min.

7. The coking wastewater treatment device according to claim 2, characterized in that, The treatment process of this device includes the following steps: S1. After the coke quenching wastewater enters the coke quenching tank (1), it overflows and passes through the first sedimentation tank (9), the second sedimentation tank (10), and the third sedimentation tank (11) in sequence; S2. The coke quenching wastewater in the third sedimentation tank (11) is sent to the inlet of the coagulation reaction tank (2) through a pipeline by a lift pump. After the coke quenching wastewater enters the first coagulation reaction tank (21), it enters the second coagulation reaction tank (22), the third coagulation reaction tank (23), and the fourth coagulation reaction tank (24) in sequence through the gravity inlet. The coagulation de-cyaniding agent dosing device (18), the anionic polyacrylamide dosing device (19), and the activated carbon dosing device (20) above the coagulation reaction tank (2) send the medicaments into the upper part of the coagulation reaction tank (2) through pipelines to react with the coke quenching wastewater. The agitator (5) in the upper part of the coagulation reaction tank (2) sets different stirring speeds according to the water inlet sequence to make the medicaments fully mix and react with the coke quenching wastewater; S3. The coke quenching wastewater after the mixing reaction flows by gravity to the bottom of the horizontal flow sedimentation tank (3), and the muddy water is separated by reducing the flow rate. The separated supernatant enters the clear water tank (12) by gravity through the pipeline at the outlet of the horizontal flow sedimentation tank (3). The sludge separated is sent to the inlet of the sludge lift pump (8) by the reciprocating movement of the sludge scraper in the horizontal flow sedimentation tank (7), and the sludge is lifted to the sludge thickening tank (13) by the sludge lift pump (8); S4. The sludge feed pump (16) of the sludge dewatering machine sends the sludge in the sludge thickening tank (13) to the sludge dewatering machine (15) for sludge dewatering treatment. The cationic PAM dosing device (17) sends the medicament into the sludge thickening tank (13) through a pipeline to react with the sludge. The supernatant generated after dewatering returns to the horizontal flow sedimentation tank (3) for cyclic treatment according to step S3, and the dewatered sludge is sent to the coal yard for coal blending use.

8. A coke quenching wastewater treatment process according to claim 7, characterized in that, In step S3, the clear water in the clear water tank (2) is sent into the coke quenching tank by the coke quenching pump to complete the next round of coke quenching, and the coke quenching wastewater after coke quenching is cyclically treated according to steps S1 - S4.

9. A coke quenching wastewater treatment process according to claim 7, characterized in that, When the supernatant enters the clear water tank (12) by gravity through the pipeline at the outlet of the horizontal flow sedimentation tank (3) in step S3, sodium hypochlorite medicament is added.

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