A treatment system and method for recycling wastewater from comprehensive utilization of steel slag

Abstract

This application relates to a treatment system and method for circulating wastewater in the comprehensive utilization of steel slag, belonging to the technical field of sewage treatment. The treatment system includes: a wastewater treatment pipeline, the inlet of the wastewater treatment pipeline is connected to a circulating water user; a precipitation unit, the precipitation unit is connected to the outlet of the wastewater treatment pipeline; a clarification unit, the clarification unit is connected to the precipitation unit; a temporary storage unit, the temporary storage unit is connected to the clarification unit; a wastewater reuse pipeline, the wastewater reuse pipeline is connected to the circulating water user; the precipitation unit and the clarification unit are used in cooperation to make the reused wastewater meet the requirements of each turbidity circulating water user in the steel slag comprehensive utilization production line. After the wastewater is treated, it is recycled, the consumption of fresh water is greatly reduced, there is no external drainage, and environmental pollution is reduced.

Description

Technical Field

[0001] This application relates to the field of sewage treatment, and particularly to a treatment system and method for comprehensively utilizing and recycling wastewater from steel slag. Background Art

[0002] In the project of comprehensive utilization of steel slag, the combined treatment process of roll pressing and vertical hot stewing has been gradually popularized and applied due to its advantages such as good slag discharge stability and low free calcium oxide content (<3%). The roll pressing and hot stewing system requires a large amount of water for cooling and dust reduction during production. At the same time, a large amount of hot smoke and dust containing water vapor is generated. In order to prevent environmental pollution caused by the smoke and dust, a wet dust removal and purification system is configured. It is used to capture a large amount of dust-containing water vapor generated during production. After being collected through the dust removal pipeline, it enters the washing tower of the wet variable-flow dust removal and dehydration facility. In the washing tower, the production water condenses the water vapor through steam nozzles and water nozzles. The purified clean gas with a qualified dust concentration is discharged into the atmosphere, and the wastewater is collected and treated for reuse.

[0003] In the project of comprehensive utilization of steel slag, the consumption of the turbidity circulating water is about 10000m 3 / d. The suspended solid concentration of the process facility return wastewater is relatively high, about 800 - 1500mg / L, and the suspended solid particle size ≤ 300um. The suspended solid concentration of the dust removal facility return wastewater is 1500 - 2500mg / L. The above wastewater has a complex composition and belongs to scaling wastewater with high suspended solids, high alkalinity, and high hardness. Especially, the dust-containing suspended solids in the water have small particle sizes and low specific gravities, making it difficult to settle. Currently, using the conventional processes of filtration and precipitation for treatment, scaling and corrosion frequently occur in the pipelines after the treated water is reused in the slag treatment equipment, seriously affecting production operation. Summary of the Invention

[0004] This application provides a treatment system and method for comprehensively utilizing and recycling wastewater from steel slag to solve the problems of high turbidity of the treated wastewater and serious scaling during reuse.

[0005] In the first aspect, this application provides a treatment system for comprehensively utilizing and recycling wastewater from steel slag.

[0006] Specifically, the treatment system includes:

[0007] A wastewater treatment pipeline, the inlet of which is connected to the circulating water user;

[0008] A precipitation unit for precipitating the wastewater. The precipitation unit is connected to the outlet of the wastewater treatment pipeline and is used to receive the wastewater generated by the circulating water user;

[0009] A clarification unit for clarifying the wastewater. The clarification unit is connected to the precipitation unit and is used to receive the wastewater treated by the precipitation unit;

[0010] A temporary storage unit for temporarily storing the treated wastewater. The temporary storage unit is connected to the clarification unit to receive the treated wastewater.

[0011] A wastewater reuse pipeline that is connected to the circulating water users to reuse the treated wastewater to the circulating water users.

[0012] As an optional implementation manner, the sedimentation unit is a multi-stage sedimentation tank.

[0013] As an optional implementation manner, the multi-stage sedimentation tank includes:

[0014] At least two horizontal flow sedimentation zones for sedimenting the sludge in the wastewater. At least two of the horizontal flow sedimentation zones are connected step by step through inclined tube sedimentation zones, and the inclined tubes are inclined upward in the wastewater treatment direction.

[0015] A suction well that is connected to the last sedimentation zone to receive the supernatant of the last sedimentation zone.

[0016] As an optional implementation manner, the number of the horizontal flow sedimentation zones is two.

[0017] As an optional implementation manner, the clarification unit includes:

[0018] A coagulator for mixing the wastewater and the medicament. The coagulator is connected to the sedimentation unit to receive the wastewater after sedimentation treatment.

[0019] A chemical dosing unit that is connected to the coagulator to add the medicament to the coagulator.

[0020] A clarifier for clarifying the sedimented wastewater. The clarifier is connected to the coagulator to receive the wastewater mixed with the medicament.

[0021] As an optional implementation manner, the coagulator is an electromagnetic coagulator; the clarifier is an inclined plate clarifier.

[0022] As an optional implementation manner, the treatment system further includes: a sludge treatment unit for treating the sludge generated by the clarification unit.

[0023] As an optional implementation manner, the circulating water users include steel slag treatment turbidity circulating water users and / or wet dust removal turbidity circulating water users.

[0024] In a second aspect, the present application provides a method for treating steel slag comprehensive utilization circulating wastewater, which uses the steel slag comprehensive utilization circulating wastewater treatment system according to any one of the embodiments in the first aspect to treat the wastewater.

[0025] Specifically, the method includes:

[0026] Performing sedimentation treatment on the wastewater;

[0027] Performing clarification treatment on the wastewater after sedimentation treatment;

[0028] Reusing the clarified wastewater to the circulating water users.

[0029] As an optional implementation manner, the performing clarification treatment on the wastewater after sedimentation treatment specifically includes:

[0030] Mixing the wastewater after sedimentation treatment with a chemical agent to obtain mixed wastewater;

[0031] Performing clarification treatment on the mixed wastewater;

[0032] Wherein, the chemical agent includes: a coagulant and a flocculant aid.

[0033] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0034] The treatment system for the circulating wastewater in the comprehensive utilization of steel slag provided by the embodiment of the present application uses a sedimentation unit in combination with a clarification unit, enabling the reused wastewater to meet the requirements of each turbidity circulating water user in the steel slag comprehensive utilization production line. The wastewater is recycled after treatment, the consumption of fresh water is greatly reduced, there is no external drainage, and environmental pollution is reduced. Description of the Drawings

[0035] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a schematic structural diagram of the system provided by the embodiment of the present application;

[0038] Figure 2 It is a flowchart of the method provided by the embodiment of the present application. Specific Embodiments

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0041] like Figure 1 As shown, an embodiment of the present application provides a treatment system for circulating wastewater from comprehensive utilization of steel slag, characterized in that the treatment system includes: a wastewater treatment pipeline, a sedimentation unit, a clarification unit, a temporary storage unit and a wastewater reuse pipeline.

[0042] A wastewater treatment pipeline, the inlet of which is connected to a circulating water user;

[0043] Specifically, the circulating water users include slag treatment turbid circulating water users and / or wet dust removal turbid circulating water users.

[0044] A sedimentation unit, used for sedimentation treatment of wastewater, the sedimentation unit is connected to the outlet of the wastewater treatment pipeline, and is used for receiving wastewater generated by the circulating water user;

[0045] In some embodiments, the sedimentation unit is a multi-stage sedimentation tank.

[0046] Furthermore, the multi-stage sedimentation tank comprises:

[0047] At least two levels of horizontal flow sedimentation zones are used to settle the sludge in the wastewater. The at least two levels of horizontal flow sedimentation zones are connected step by step through inclined tube sedimentation zones, and the inclined tubes are inclined upward according to the wastewater treatment direction. Regarding the inclined tube sedimentation zone, its horizontal inclination angle should be 60° and its length should not be less than 0.3m.

[0048] A water absorption well is connected to the sedimentation zone of the last stage and is used for receiving the supernatant of the sedimentation zone of the last stage.

[0049] Optionally, the entire bottom of the multi-stage sedimentation tank is paved with steel rails 24 .

[0050] In order to facilitate the cleaning of sludge in the multi-stage sedimentation tank, in this embodiment, the multi-stage sedimentation tank is equipped with a single-beam grab crane 17 to grab the sedimentation sludge to the slag pool 16, and finally the sludge is transported out for centralized treatment. The slope of the bottom of the slag pool is not less than 2%; optionally, a steel pipe is pre-buried at the tail of the slag pool, and the filtrate is returned to the multi-stage sedimentation tank for further treatment.

[0051] In this embodiment, the number of the horizontal flow sedimentation zones is two levels.

[0052] A clarification unit for clarifying the wastewater. The clarification unit is connected to the sedimentation unit to receive the wastewater treated by the sedimentation unit.

[0053] In some embodiments, the clarification unit includes:

[0054] A coagulator for mixing the wastewater and the medicament. The coagulator is connected to the sedimentation unit to receive the wastewater after sedimentation treatment.

[0055] A chemical dosing unit. The chemical dosing unit is connected to the coagulator to add the medicament into the coagulator.

[0056] A clarifier for clarifying the wastewater after sedimentation. The clarifier is connected to the coagulator to receive the wastewater mixed with the medicament.

[0057] In this embodiment, the coagulator is an electromagnetic coagulator; the clarifier is an inclined plate clarifier.

[0058] In this embodiment, the inlet water of the inclined plate clarifier realizes uniform water distribution by using a chute. The bottom sludge of the inclined plate clarifier is discharged by a screw sludge conveyor. The inclined plate clarifier is equipped with a sludge storage pump house, and a sludge storage tank and a slurry pump are arranged in the pump house; and / or a stirrer is arranged in the storage tank.

[0059] A temporary storage unit for temporarily storing the treated wastewater. The temporary storage unit is connected to the clarification unit to receive the treated wastewater.

[0060] A wastewater reuse pipeline. The wastewater reuse pipeline is connected to the circulating water user to reuse the treated wastewater to the circulating water user.

[0061] In some embodiments, the treatment system further includes: a sludge treatment unit for treating the sludge generated by the clarification unit.

[0062] The sludge dewatering equipment of the sludge treatment unit adopts a diaphragm plate and frame filter press.

[0063] As Figure 2 shown, based on one general inventive concept, the embodiments of the present application further provide a method for treating the circulating wastewater for comprehensive utilization of steel slag.

[0064] The treatment method for the circulating wastewater in the comprehensive utilization of steel slag is realized based on the above treatment system for the circulating wastewater in the comprehensive utilization of steel slag. The specific steps of the treatment method for the circulating wastewater in the comprehensive utilization of steel slag can refer to the above embodiments. Since the treatment method for the circulating wastewater in the comprehensive utilization of steel slag adopts some or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0065] Specifically, the method includes:

[0066] S1. Perform sedimentation treatment on the wastewater;

[0067] In this embodiment, the wastewater to be treated enters the multi-stage sedimentation tank 25 for treatment. After being treated by multi-stage sedimentation cooperation, the suspended solid content in the supernatant is less than 1500 mg / L, and the particle size of the suspended particles is less than 60 um. Specifically, the wastewater to be treated enters the first horizontal flow sedimentation area 1 of the multi-stage sedimentation tank 25, and the suspended solids in the wastewater are preliminarily settled, mainly removing the sludge with a specific gravity greater than 2.5 t / m 3 in the wastewater discharged from the steel slag comprehensive utilization facilities. Then it enters the intermediate inclined tube sedimentation area 2. The horizontal inclination angle of the inclined tube is 60°, and the length is not less than 0.3 m. On the one hand, it is a supplement to the first-stage sedimentation, and on the other hand, it is for uniform water distribution in the second-stage sedimentation area to prevent bottom sludge disturbance. The wastewater enters the second horizontal flow sedimentation area 3 to further remove the sludge with a specific gravity greater than 2 t / m 3 Finally, the supernatant enters the suction well 4 and is lifted to the high-efficiency inclined plate clarifier for treatment by the water pump 5. The residence time of the wastewater in the multi-stage sedimentation tank is not less than 10 min, and the aspect ratio of the sedimentation tank is 1.2 - 1.5; the height of the sediment part of the sedimentation tank is not less than 1 m, the effective water depth is 1 - 3 m, and the protection height is not less than 1 m.

[0068] Controlling the residence time not less than 10 min can ensure sufficient sedimentation time to achieve better solid-liquid separation. Controlling the aspect ratio of the sedimentation tank to be 1.2 - 1.5 can ensure stable water flow and reduce disturbance.

[0069] S2. Perform clarification treatment on the wastewater after sedimentation treatment;

[0070] In some embodiments, the clarification treatment of the wastewater after sedimentation treatment specifically includes:

[0071] S2.1. Mix the wastewater after sedimentation treatment with the medicament to obtain mixed wastewater;

[0072] S2.2. Perform clarification treatment on the mixed wastewater;

[0073] Among them, the medicament includes: coagulant and flocculant aid.

[0074] In this embodiment, the coagulant is selected as polyaluminum chloride (PAC), and the coagulant aid is polyacrylamide (PAM).

[0075] Generally, the dosages of the coagulant and the coagulant aid are as follows: the dosage of the coagulant (concentration 5% - 10%) is 20 - 40 mg / L, and the dosage of the coagulant aid (concentration 2‰) is 1 - 3 mg / L.

[0076] In this embodiment, after the supernatant in the water absorption well 4 is pressurized and passes through the electromagnetic coagulator 20, it enters the high - efficiency inclined - plate clarifier 6 through the water distribution chute 26, further removing the dust - containing wastewater with fine particle size and difficult precipitation discharged from the wet dust removal facility. The suspended solid content of the effluent is less than 100 mg / L, and the pH is 6 - 8, meeting the water quality requirements of the steel - slag comprehensive utilization turbidity - cycle water users. The underflow slurry at the bottom of the clarifier is discharged to the sludge pool, and the moisture content of the underflow slurry is 60 - 70%; specifically, the water discharged from the multi - stage sedimentation tank 25 is quickly mixed with the liquid medicine in the coagulant dosing device 18 and the coagulant - aid dosing device 19 in the electromagnetic coagulation device 20. After the water is rectified and evenly distributed through the chute 26, it enters the high - efficiency inclined - plate clarifier 6. Using the shallow - layer sedimentation theory of dispersed particles, the dust - like suspended solids with a particle size less than 60 μm are further effectively reduced. To ensure the treatment effect and optimize the equipment configuration at the same time, the sedimentation time should not be greater than 15 min, and the surface load should not be greater than 3 m 3 / m 2 ·h. The effluent of the high - efficiency inclined - plate clarifier 6 flows by gravity into the temporary storage pool 7. The underflow sludge at the bottom of the above - mentioned high - efficiency inclined - plate clarifier 6 is transported to the sludge storage pool 11 by the screw sludge conveyor 10. The moisture content of the underflow slurry is 60 - 70%. According to the actual production situation, the sludge is discharged at least once per shift, and each time it is usually designed according to the operation of a single - screw sludge conveyor.

[0077] S3. Reuse the clarified wastewater to the circulating - water user 21.

[0078] In this embodiment, the qualified water is stored in the temporary storage pool 7, pressurized by the water pump group 8 and sent to the steel - slag treatment turbidity - cycle user 23, and pressurized by the water pump group 9 and sent to the wet - dust - removal turbidity - cycle water user 22. The turbidity - cycle wastewater discharged after the above users use it returns to the multi - stage sedimentation tank 25 for treatment, and there is no external drainage throughout the process. During the recycling and treatment of the wastewater, about 10% of the circulating treatment water volume is lost. It is advisable to supplement the production fresh water in the temporary storage pool 7, and the liquid level gauge is interlocked with the electric water - filling valve for control.

[0079] Regarding the treatment of sludge, in this embodiment, the sludge in the sludge storage pool 11 is lifted to the diaphragm plate - and - frame filter press 14 by the slurry pump 13. The solid content of the dehydrated sludge is not less than 70%. The dehydrated sludge is transported out for centralized treatment, and the filtrate flows back to the multi - stage sedimentation tank 25 for further treatment. Generally, a stirring device 12 is provided in the sludge storage pool.

[0080] With the above design, through processes such as multi-stage sedimentation tanks, high-efficiency inclined plate clarifiers, chemical dosing, sludge treatment, and recycled water lifting. The suspended solids in the effluent are less than 100 mg / L, and the pH is 6 - 8. The effluent quality meets the water quality requirements of each turbidity circulating water user in the steel slag comprehensive utilization production line. After the wastewater is treated and recycled, the consumption of fresh water is greatly reduced, there is no external drainage, and environmental pollution is reduced. It can effectively overcome the characteristics of the dispersed particle size and specific gravity of the suspended solids in the incoming wastewater. The multi-stage sedimentation tank preferentially removes suspended mud and slag with a particle size greater than 60 um and a particle specific gravity greater than 2. The high-efficiency inclined plate clarifier focuses on removing light dust-like suspended solids with a particle size less than 60 um and a specific gravity less than 1. Through chemical dosing and precipitation, the characteristics of high alkalinity and high hardness of the incoming wastewater can be effectively overcome at the same time. The entire method has a short process flow, a short sedimentation time, a compact layout, and is convenient for operation and maintenance. It can efficiently reduce various wastewaters containing high suspended dust and mud and slag, and is applicable to the treatment of wastewaters generated by various steel slag comprehensive utilization and flue gas treatment production lines.

[0081] The following will further elaborate on this application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate this application and not to limit the scope of this application. The experimental methods without specific conditions noted in the following embodiments are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0082] Embodiment

[0083] The wastewater to be treated in this embodiment is the turbidity circulating wastewater from the deep treatment production line of converter slag in a certain steel plant, with a water volume of 14400 m 3 / d, and the suspended solid concentration in the influent is about 4200 mg / L. Among them, the particles with a particle size greater than 150 um account for 17%, the suspended particles with a particle size between 75 - 150 um account for 44%, and the others are suspended particles with a particle size less than 74 um.

[0084] S1, the wastewater to be treated enters the multi-stage sedimentation tank 25 for treatment. After being treated by the coordinated multi-stage sedimentation of the primary horizontal flow sedimentation tank 1, the intermediate inclined tube filter 2, and the secondary horizontal flow sedimentation tank 3 respectively, the suspended solid content in the supernatant is about 1300 mg / L, and the particle size of the suspended particles is less than 60 um.

[0085] S2, the coagulant dosing device 18 uses polyaluminum chloride (PAC), and the coagulant aid dosing device 19 uses polyacrylamide (PAM) to be rapidly mixed with the incoming water in the electromagnetic coagulation device 20 to form flocs. Among them, the magnetic field strength is greater than 200 mT, the water filling depth is 350 mm, the magnetic path is 100 mm, and the exciting current DA is 25 A. Then it enters the high-efficiency inclined plate clarifier 6 through the water distribution chute 26, the sedimentation time is 15 min, and the surface load is taken as 2.5 m 3 / m 2·h can effectively remove the fine-sized and difficult-to-precipitate suspended particulate matter such as soot in the wastewater treatment station. The suspended solid content in the effluent is less than 100 mg / L, and the pH is 6 - 8, meeting the water quality requirements of the turbidity loop water users for comprehensive utilization of steel slag.

[0086] The water qualified by S3 is stored in the temporary storage pool 7, pressurized by the water pump group 8 and sent to the turbidity loop users for steel slag treatment, and pressurized by the water pump group 9 and sent to the turbidity loop water users for wet dust removal. The turbidity loop wastewater discharged after the above users use it returns to the multi-stage sedimentation tank 25 for treatment, and there is no external drainage throughout the process. During the recycling and treatment of wastewater, the water loss is about 60 m 3 / h, and it is supplemented with newly produced water. On the one hand, it ensures the water quality of the circulating water, and on the other hand, it reduces the forced sewage discharge of the system.

[0087] S4, the sludge in the sludge storage tank 11 is lifted to the diaphragm plate and frame filter press 14 by the slurry pump 13. The solid content of the dehydrated sludge is not less than 70%, and the dehydrated sludge is transported out for centralized treatment, and the filtrate flows back to the multi-stage sedimentation tank 25 for re-treatment. The slurry pump 13 and the diaphragm plate and frame filter press 14 are in one-to-one correspondence to ensure that the sludge dewatering work is not affected by equipment maintenance.

[0088] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and the individual values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and the individual numbers within that range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any recited number (fraction or integer) within the indicated range.

[0089] In this application, unless otherwise stated, the orientation terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Additionally, in the description of this application's specification, the terms "include", "comprise", etc. mean "include but not limited to". In this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In this text, "and / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. In this text, "at least one" means one or more, and "a plurality" means two or more. "At least one kind", "at least one (item) of the following", or similar expressions refer to any combination of these items, including any combination of single items (items) or plural items (items). For example, "at least one (item) of a, b, or c", or, "at least one (item) of a, b, and c" can both represent: a, b, c, a - b (i.e., a and b), a - c, b - c, or a - b - c, where a, b, and c can be single or multiple respectively.

[0090] The above description is only the specific implementation manners of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A treatment system for circulating wastewater in the comprehensive utilization of steel slag, characterized in that, The processing system includes: A wastewater treatment pipeline, the inlet of which is connected to the circulating water user; A sedimentation unit for sedimenting the wastewater. The sedimentation unit is connected to the outlet of the wastewater treatment pipeline to receive the wastewater generated by the circulating water user; A clarification unit for clarifying the wastewater. The clarification unit is connected to the sedimentation unit to receive the wastewater treated by the sedimentation unit; A temporary storage unit for temporarily storing the treated wastewater. The temporary storage unit is connected to the clarification unit to receive the treated wastewater; A wastewater reuse pipeline connected to the circulating water user to reuse the treated wastewater to the circulating water user; The sedimentation unit is a multi-stage sedimentation tank, including: At least two horizontal flow sedimentation areas for sedimenting the sludge in the wastewater. At least two of the horizontal flow sedimentation areas are connected step by step through inclined tube sedimentation areas. The inclined tubes are inclined upward in the wastewater treatment direction, with a horizontal inclination angle of 60° and a length of not less than 0.3 m; A suction well connected to the last sedimentation area to receive the supernatant of the last sedimentation area; The clarification unit includes: A coagulator for mixing the wastewater and the reagent. The coagulator is connected to the sedimentation unit to receive the wastewater after sedimentation treatment; A reagent adding unit connected to the coagulator to add the reagent into the coagulator; A clarifier for clarifying the sedimented wastewater. The clarifier is connected to the coagulator to receive the wastewater mixed with the reagent; The coagulator is an electromagnetic coagulator; the clarifier is an inclined plate clarifier.

2. The treatment system for the recycled wastewater from the comprehensive utilization of steel slag according to claim 1, wherein, The number of the horizontal flow sedimentation areas is two.

3. The treatment system for the circulating wastewater from the comprehensive utilization of steel slag according to claim 1, wherein, The processing system further includes: a sludge treatment unit for treating the sludge generated by the clarification unit.

4. The treatment system for the circulating wastewater in the comprehensive utilization of steel slag according to claim 1, wherein, The circulating water user includes a steel slag treatment turbidity circulating water user and / or a wet dust removal turbidity circulating water user.

5. A treatment method for the recycled wastewater in the comprehensive utilization of steel slag, characterized in that, Using the processing system for circulating wastewater in comprehensive utilization of steel slag according to any one of claims 1 to 4; the method includes: Performing sedimentation treatment on the wastewater; Performing clarification treatment on the wastewater after sedimentation treatment; Reusing the clarified wastewater to the circulating water user.

6. The treatment method of the circulating wastewater for comprehensive utilization of steel slag according to claim 5, characterized in that, The performing clarification treatment on the wastewater after sedimentation treatment specifically includes: Mixing the wastewater after sedimentation treatment and the reagent to obtain mixed wastewater; Performing inclined plate clarification treatment on the mixed wastewater; Wherein, the reagent includes: a coagulant and a flocculant aid.

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