Coal coking produces high turbidity wastewater treatment system

Abstract

The utility model discloses a coal coking output high turbidity wastewater treatment system, including rough grating machine, fine grating machine, sedimentation tank, cyclone, aeration tank and multimedium filter and mould filter group that communicate in proper order, the utility model has the advantageous effects that: through with the coal coking output high turbidity wastewater is introduced in proper order to grating machine, fine grating machine, sedimentation tank, cyclone group, aeration tank and multimedium filter and mould filter group the linkage treatment system that is formed can effectively purify high turbidity wastewater and make it reach the reusable standard, not only avoid the waste of water resources, reduce wastewater discharge pressure, simultaneously, the purified water source is introduced into the production system again and uses, can reduce production low cost input.

Description

Technical Field

[0001] This utility model belongs to the field of coal coking wastewater treatment, and in particular relates to a treatment system for high-turbidity wastewater produced by coal coking. Background Technology The coal coking process generates a large amount of wastewater, primarily from coal-to-coke, coal gas purification, and coking product recovery. This wastewater is complex in composition and highly turbid. Untreated discharge of large quantities of coking wastewater will cause serious damage to the ecological environment.

[0002] Currently, coal coking plants generally use a combination of biochemical degradation and coagulation sedimentation to treat wastewater. However, the treated water still has high turbidity, resulting in poor water purification. This treated water can only be used in operations with low water quality requirements, such as wet quenching and coal yard wastewater treatment. Introducing it into system equipment leads to the formation of a fouling layer on equipment surfaces. Sludge adhering to the inner walls of pipes reduces the cross-sectional area for water flow, increases flow resistance, and lowers equipment operating efficiency. Simultaneously, the sludge forms oxygen concentration cells, accelerating the corrosion of metal equipment and further shortening its lifespan. To alleviate excessive turbidity and water quality deterioration, production plants are forced to implement large-scale water replacement measures, further increasing water consumption, water fees, sewage discharge fees, and labor, consumable, and operation and maintenance costs due to frequent maintenance. Furthermore, large-scale water replacement not only results in a serious waste of water resources but also increases the pressure on wastewater treatment, contradicting current energy conservation and emission reduction policies. Summary of the Invention

[0003] The purpose of this invention is to provide a treatment system for highly turbid wastewater produced by coal coking, and to overcome the shortcomings of the prior art. It effectively solves the existing problem of poor purification effect of highly turbid wastewater produced by coal coking.

[0004] The present invention relates to a high-turbidity wastewater treatment system for coal coking, comprising a coarse bar screen, a fine bar screen, a sedimentation tank, a hydrocyclone, an aeration tank, a multi-media filter, and a modular filter assembly connected in sequence. A first bypass is connected to the clear liquid output pipeline of the modular filter assembly, and the output end of the first bypass is connected to a first water storage tank. The output pipeline of the first water storage tank is connected to a chemical dosing room, and multiple output pipelines of the chemical dosing room are respectively connected to the sedimentation tank and the aeration tank.

[0005] Furthermore, the backwash water supply pipelines of both the multi-media filter and the modular filter group are connected to the first water storage tank.

[0006] Furthermore, a second bypass is connected to the pipeline connecting the multi-media filter and the modular filter group, and the second bypass is connected to the second water storage tank. The backwash water supply pipelines of the coarse bar screen and the fine bar screen are both connected to the second water storage tank.

[0007] Furthermore, the backwash water supply pipeline of the hydrocyclone assembly is connected to the second water storage tank.

[0008] Furthermore, the solid waste conveying lines of both the coarse bar screen and the fine bar screen are connected to the solid waste pool.

[0009] Furthermore, the sludge conveying lines of both the sedimentation tank and the hydrocyclone group are connected to the sludge tank.

[0010] Furthermore, the drain pipes of the hydrocyclone, the multi-media filter, and the modular filter assembly are all connected to the wastewater tank.

[0011] The beneficial effects of this utility model are as follows: By sequentially introducing the highly turbid wastewater produced by coal coking into a linkage treatment system consisting of a bar screen, a fine bar screen, a sedimentation tank, a hydrocyclone group, an aeration tank, a multi-media filter, and a modular filter group, the highly turbid wastewater can be effectively purified to meet the standard of reusability. This not only avoids the waste of water resources and reduces the pressure of wastewater discharge, but also allows the purified water to be reintroduced into the production system for reuse, thereby reducing production costs. Attached Figure Description

[0012] Figure 1 This is a system view of the present invention; In the diagram, 1 is a coarse bar screen, 2 is a fine bar screen, 3 is a sedimentation tank, 4 is a hydrocyclone, 5 is a multi-media filter, 6 is a filter module, 7 is a first bypass, 8 is a first water storage tank, 9 is a chemical dosing room, 10 is a second bypass, 11 is a second water storage tank, 12 is a solid waste tank, 13 is a sludge tank, and 14 is a wastewater tank. Detailed Implementation

[0013] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings: like Figure 1 As shown, the high-turbidity wastewater treatment system for coal coking includes a coarse bar screen 1, a fine bar screen 2, a sedimentation tank 3, a hydrocyclone 4, an aeration tank 5, a multi-media filter 6, and a modular filter group 7 connected in sequence. A first bypass 8 is connected to the clear liquid output pipeline of the modular filter group 7. The output end of the first bypass 8 is connected to a first water storage tank 9. The output pipeline of the first water storage tank 9 is connected to a chemical dosing room 10. Multiple output pipelines of the chemical dosing room 10 are respectively connected to the sedimentation tank 3 and the aeration tank 5.

[0014] Specifically, by introducing the highly turbid wastewater produced by coal coking into a treatment system consisting of a bar screen 1, a fine bar screen 2, a sedimentation tank 3, a hydrocyclone group 4, an aeration tank 5, a multi-media filter 5, and a filter module group 7, the highly turbid wastewater can be effectively purified.

[0015] In actual use, the high-turbidity wastewater produced by coal coking is first introduced into the coarse screen 1 to remove large particulate pollutants, reducing the mechanical wear and clogging risk of the subsequent fine screen. The filtered wastewater is then transported to the fine screen 2 for the separation and removal of small particulate pollutants, avoiding blockage or efficiency reduction in the conveying pipeline due to small impurities in subsequent processes. Under the dual filtration of the two screens, solid impurities larger than 50 mm in the wastewater can be filtered out, thus completing the pretreatment of the wastewater. When the wastewater is transported to the subsequent sedimentation tank 3, the suspended solids (such as silt, metal particles, etc.) carried in the wastewater gradually settle to the bottom of the tank by gravity, effectively reducing the concentration of suspended solids in the water and creating better conditions for subsequent treatment processes. When the wastewater is transported to the hydrocyclone 4, the centrifugal force generated by the high-speed rotating water flow is used to separate and discharge the remaining suspended solids in the wastewater in a very short time, further improving the purification effect and thus completing the primary treatment of the wastewater. After the wastewater is transported to the subsequent aeration tank 5, the wastewater pollutants are degraded by the activated sludge in the tank. When the wastewater is further transported to the multi-media filter 6, the residual fine suspended solids can be further adsorbed by the double-layer filter media such as quartz sand and anthracite, thus completing the intermediate stage of wastewater treatment. When the wastewater is transported to the subsequent filter module 7, the nanofiltration membrane and reverse osmosis membrane can remove residual organic matter, microorganisms and some dissolved salts from the water, making the water quality reach a level that can be reused. The first bypass 8 can transport part of the purified water to the first storage tank 9 for storage, and then use it to prepare reagents in the dosing room 10 before being fed into the sedimentation tank 3 and aeration tank 5. This realizes the reuse of purified wastewater and reduces the cost of the wastewater treatment system.

[0016] like Figure 1As shown, in the coal coking wastewater treatment system, the backwash water supply pipelines of the multi-media filter 6 and the modular filter group 7 are both connected to the first water storage tank 9; a second bypass 11 is connected to the conveying pipeline between the multi-media filter 6 and the modular filter group 7, and the output end of the second bypass 11 is connected to the second water storage tank 12; the backwash water supply pipelines of the coarse bar screen 1 and the fine bar screen 2 are both connected to the second water storage tank 12; the backwash water supply pipeline of the hydrocyclone 4 is connected to the second water storage tank 12; the solid waste conveying lines of the coarse bar screen 1 and the fine bar screen 2 are both connected to the solid waste tank 13; the sludge conveying lines of the sedimentation tank 3 and the hydrocyclone 4 are both connected to the sludge tank 14; the backwash discharge pipelines of the hydrocyclone 4, the multi-media filter 6, and the modular filter group 7 are all connected to the wastewater tank 15. Specifically, by transporting a portion of the purified water to the first reservoir 9 and the second reservoir 12 for storage and using it for backwashing of the wastewater treatment equipment, not only is wastewater purification and reuse achieved, but the maintenance cost of the wastewater treatment equipment is also reduced.

[0017] In actual use, when the operating resistance of the multi-media filter 6 and the modular filter group 7 increases and backwashing is required, the corresponding backwashing water supply pipeline will extract the clean water stored in the first water storage tank 9 and use it for the backwashing of the multi-media filter 6 and the modular filter group 7. When the operating resistance of the coarse bar screen 1 and the fine bar screen 2 increases and backwashing is required, since the water quality requirements for backwashing water are not high, part of the water filtered by the multi-media filter 6 can be transported to the second water storage tank 12 through the second bypass 11 and used for the backwashing of the coarse bar screen 1 and the fine bar screen 2. When the hydrocyclone 4 needs backwashing, water from the second water storage tank 12 is also extracted for use. Solid impurities filtered by coarse bar screen 1 and fine bar screen 2 can be transported to solid waste tank 13 for centralized temporary storage; sludge produced by sedimentation tank 3 and hydrocyclone 4 can be transported to sludge tank 14 for centralized temporary storage; additional wastewater generated during backwashing of hydrocyclone 4, multi-media filter 6, and filter module 7 can be transported to wastewater tank 15 for temporary storage. Through the above processes, solid waste generated in each stage of the high-turbidity wastewater treatment system can be centrally stored and treated, thereby improving the operating efficiency of the wastewater treatment system and reducing maintenance costs. The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-turbidity wastewater treatment system for coal coking products, characterized in that: The system includes a coarse bar screen (1), a fine bar screen (2), a sedimentation tank (3), a hydrocyclone (4), an aeration tank (5), a multi-media filter (6), and a modular filter group (7) connected in sequence. A first bypass (8) is connected to the clear liquid output pipeline of the modular filter group (7). The output end of the first bypass (8) is connected to the first water storage tank (9). The output pipeline of the first water storage tank (9) is connected to the chemical dosing room (10). The multiple output pipelines of the chemical dosing room (10) are respectively connected to the sedimentation tank (3) and the aeration tank (5).

2. The high-turbidity wastewater treatment system for coal coking products according to claim 1, characterized in that: The backwash water supply lines of the multi-media filter (6) and the modular filter group (7) are both connected to the first water storage tank (9).

3. The high-turbidity wastewater treatment system for coal coking products according to claim 1, characterized in that: A second bypass (11) is connected in the conveying pipeline between the multi-media filter (6) and the module filter group (7). The output end of the second bypass (11) is connected to the second water storage tank (12). The backwash water supply pipelines of the coarse bar screen (1) and the fine bar screen (2) are both connected to the second water storage tank (12).

4. The coal coking wastewater treatment system according to claim 3, characterized in that: The backwash water supply line of the hydrocyclone (4) is connected to the second water storage tank (12).

5. The coal coking wastewater treatment system according to claim 1, characterized in that: The solid waste conveying lines of both the coarse bar screen (1) and the fine bar screen (2) are connected to the solid waste pool (13).

6. The high-turbidity wastewater treatment system for coal coking products according to claim 1, characterized in that: The sludge transport lines of the sedimentation tank (3) and the hydrocyclone (4) are both connected to the sludge tank (14).

7. The coal coking wastewater treatment system according to claim 1, characterized in that: The backwashing drain pipes of the hydrocyclone (4), the multi-media filter (6), and the modular filter group (7) are all connected to the wastewater tank (15).

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