Efficient magnetic flocculation sedimentation treatment equipment and wastewater treatment method

Abstract

The invention discloses efficient magnetic flocculation sedimentation treatment equipment and a wastewater treatment method. The equipment comprises a first reaction tank, a second reaction tank, a dosing system, a magnetic sedimentation area, a magnetic separation and recovery area and a post-sedimentation area, the first reaction tank, the second reaction tank and the magnetic precipitation area are adjacently arranged in sequence and are communicated, and the dosing system is respectively connected with the first reaction tank and the second reaction tank; the magnetic separation and recovery area and the rear precipitation area are adjacently arranged and communicated, and are adjacently arranged and communicated with the magnetic precipitation area; a sludge return pipeline with a bent structure is arranged at the bottom of the magnetic separation and recovery area, the sludge return pipeline is horizontally arranged, a communicated magnetic powder recovery box is arranged at the upper part of a pipe body, and the magnetic separation and recovery area is communicated with the second reaction tank through the sludge return pipeline; and an inclined tube sedimentation tank structure is arranged in the rear sedimentation area. The equipment can effectively improve the utilization rate of the medicament and the recovery efficiency of the magnetic powder, reduce the operation cost and enable the system to efficiently and stably operate.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment equipment, and specifically relates to a high-efficiency magnetic flocculation sedimentation treatment equipment and a wastewater treatment method. Background Art

[0002] The process of purifying sewage to meet the water quality requirements for discharge into a water body or reuse is sewage treatment. Magnetic flocculation sedimentation technology is a physical and chemical treatment technology in the field of sewage treatment. Magnetic powder is added to the ordinary coagulation sedimentation process to enhance the flocculation effect, and combined with the special effects of flocculants to form magnetic flocs and accelerate the sedimentation process. The principle of magnetic flocculation sedimentation is to separate or remove colloids and dispersed particles in water by magnetic field based on the magnetic sensitivity of the pollutants themselves or the addition of magnetic materials. Magnetic flocculation sedimentation treatment is widely used in municipal sewage, water environment management and other fields, and has broad application prospects.

[0003] The existing magnetic flocculation sedimentation water treatment device technology is prone to the following problems: At present, the magnetic flocculation sedimentation technology mostly adopts civil engineering structure. When faced with short construction period, temporary emergency, transition, limited construction space, etc., civil engineering or integrated steel structure forms limit the application of magnetic flocculation sedimentation technology; the utilization rate of existing common magnetic flocculation sedimentation coagulants and coagulants is low, the overall system treatment efficiency is low, which is not conducive to the efficient and stable operation of the system, the demand for reagent addition is large, and the overall operating cost is high; when adding reagents and magnetic powder to the system, it is usually estimated or manually Rough methods such as weighing are used for addition, and the dosage is mostly adjusted based on experience. There is an error in each addition, which affects the treatment efficiency of the magnetic flocculation sedimentation technology. In application, the magnetic powder is not easy to separate from the sludge, and the separation effect of the flocs and the magnetic medium is poor, which affects the magnetic powder recovery efficiency, increases the operating cost, and affects the stability of the sewage treatment effect. The area division of the magnetic flocculation sedimentation treatment device is not clear, and when personnel operate, it is easy to have problems with different treatment procedures operating in the same area. The water treatment steps are easily confused or omitted by the operators, which affects the sludge sedimentation effect and causes poor effluent quality. Summary of the invention

[0004] Purpose of the invention: In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a high-efficiency magnetic flocculation sedimentation treatment equipment and a wastewater treatment method, which can effectively improve the utilization rate of coagulants and coagulants in the magnetic coagulation sedimentation system and the magnetic powder recovery efficiency, reduce operating costs, and make the system operate efficiently and stably.

[0005] Technical solution: In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] A high-efficiency magnetic flocculation sedimentation treatment equipment comprises a first reaction tank, a second reaction tank, a dosing system, a magnetic precipitation area, a magnetic separation recovery area and a post-precipitation area; the first reaction tank, the second reaction tank and the magnetic precipitation area are arranged adjacent to each other in sequence and are connected, and the dosing system is connected to the first reaction tank and the second reaction tank respectively; the magnetic separation recovery area and the post-precipitation area are arranged adjacent to each other and are connected, and both are arranged adjacent to and connected to the magnetic precipitation area; a sludge return pipeline with a curved structure is arranged at the bottom of the magnetic separation recovery area, the sludge return pipeline is arranged horizontally, and a connected magnetic powder recovery box is arranged on the upper part of the pipe body, and the magnetic separation recovery area is connected to the second reaction tank through the sludge return pipeline; an inclined tube sedimentation tank structure is arranged inside the post-precipitation area.

[0007] As a specific implementation scheme, the first reaction tank, the second reaction tank and the magnetic precipitation area are connected in sequence through a water pipe at the bottom; the magnetic precipitation area and the post-precipitation area are connected through the holes in the side wall, and the magnetic precipitation area and the magnetic separation recovery area are connected through the water pipe at the bottom; the post-precipitation area and the magnetic separation recovery area are connected through the water pipe at the bottom.

[0008] As a specific implementation scheme, the sludge return pipeline with a curved structure, wherein the curved structure is a continuous "S"-shaped curved structure; the magnetic powder recovery box has a built-in magnet for adsorbing magnetic powder.

[0009] As a specific implementation scheme, the magnetic precipitation area and the bottom of the second reaction tank are also connected with a sludge return pipeline.

[0010] As a specific implementation scheme, the side wall of the first reaction tank is connected to a water inlet pipe, and the side wall of the post-precipitation area is connected to a water outlet pipe.

[0011] As a specific implementation scheme, each area in the high-efficiency magnetic flocculation sedimentation treatment equipment is a skid-mounted structure.

[0012] As a specific implementation scheme, the dosing system is provided with a PLC control system, which can adjust the amount of drugs added to the first reaction tank and the second reaction tank according to different sewage types.

[0013] The present invention also provides a method for treating wastewater using the high-efficiency magnetic flocculation sedimentation treatment equipment, comprising the following steps:

[0014] Step 1: The dosing system adds coagulant and flocculant to the first reaction tank, and adds magnetic powder to the second reaction tank. The sewage treated in the two reaction tanks becomes magnetic sludge;

[0015] Step 2: The magnetic sludge enters the magnetic precipitation area, part of the magnetic sludge in the magnetic precipitation area returns to the second reaction tank to continue the reaction, part of the magnetic sludge enters the magnetic separation recovery area, and the sewage enters the post-precipitation area;

[0016] Step 3: The magnetic separation recovery area separates the magnetic powder in the magnetic sludge through a magnetic powder recovery box, and the separated magnetic powder is reused in the second reaction tank, and the separated sludge is returned to the second reaction tank through a sludge return pipeline;

[0017] Step 4: The post-sedimentation area precipitates the sewage through an inclined tube sedimentation tank structure, and the precipitate enters the magnetic separation recovery area for magnetic separation, and the supernatant is discharged.

[0018] As a specific implementation, the coagulant is selected from polyaluminium chloride PAC, and the flocculant is selected from NJS-715 and NJS-705.

[0019] Beneficial effects: Compared with the prior art, the equipment of the present invention adopts a skid-mounted structural design, integrating a coagulation reaction area (including a first reaction tank and a second reaction tank), a magnetic sedimentation area, a post-sedimentation area and a magnetic separation recovery area. The equipment occupies a small area as a whole, saves space, has a compact structure, can achieve overall migration, and has a high reuse rate. A sludge return pipeline with a special structure is designed to improve the magnetic powder recovery rate, which reaches more than 99.9%, reduces operating costs, reduces the impact of magnetic powder on subsequent treatment systems, and improves sewage treatment efficiency. A post-sedimentation system is added, the structure of the inclined tube sedimentation tank is optimized, and the laminar flow principle is used to improve the sedimentation tank treatment capacity, shorten the particle settling distance, shorten the sedimentation time, and increase the sedimentation area. The magnetic powder in the residual sludge is intercepted by post-sedimentation to separate flocs and magnetic media. A PLC control system is applied to improve the system control efficiency, and the dosage of PAC, PAM, magnetic powder, etc. can be adjusted according to the concentration of different sewage types to achieve precise dosage and remote control. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the high-efficiency magnetic flocculation sedimentation treatment equipment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] A high-efficiency magnetic flocculation sedimentation treatment equipment, such as Figure 1As shown, it includes a first reaction tank 1, a second reaction tank 2, a dosing system 3, a magnetic precipitation area 4, a magnetic separation recovery area 5 and a post-precipitation area 6; the first reaction tank 1, the second reaction tank 2 and the magnetic precipitation area 4 are arranged adjacent to each other in sequence and are connected, and the dosing system 3 is connected to the first reaction tank 1 and the second reaction tank 2 respectively; the magnetic separation recovery area 5 and the post-precipitation area 6 are arranged adjacent to each other and are connected, and both are arranged adjacent to and connected with the magnetic precipitation area 4; a continuous "S"-shaped curved sludge return pipeline 51 is arranged at the bottom of the magnetic separation recovery area 5, the sludge return pipeline 51 is arranged horizontally, and a connected magnetic powder recovery box 52 is arranged on the upper part of the pipe body, and the magnetic powder recovery box 52 has a built-in magnet for adsorbing magnetic powder. Under the action of gravity, the sludge will not enter the inside of the magnetic powder box, and the remaining magnetic powder in the sludge is adsorbed to the inside of the magnetic powder box by the magnet in the magnetic powder box; the magnetic separation recovery area 5 is connected to the second reaction tank 2 through the sludge return pipeline 51; an inclined tube sedimentation tank structure 61 is arranged inside the post-precipitation area 6. The magnetic precipitation area 4 and the bottom of the second reaction tank 2 are also connected with a sludge return pipeline.

[0024] The first reaction tank 1, the second reaction tank 2 and the magnetic precipitation area 4 are connected in sequence through the water pipe at the bottom; the magnetic precipitation area 4 and the post-precipitation area 6 are connected through the holes in the side wall, and the magnetic precipitation area 4 and the magnetic separation recovery area 6 are connected through the water pipe at the bottom; the post-precipitation area 4 and the magnetic separation recovery area 5 are connected through the water pipe at the bottom.

[0025] The side wall of the first reaction tank 1 is connected to a water inlet pipe 11 , and the side wall of the post-precipitation area 6 is connected to a water outlet pipe 62 .

[0026] The various treatment areas in the high-efficiency magnetic flocculation sedimentation treatment equipment are integrated and designed as a skid-mounted structure. The dosing system 3 is equipped with a PLC control system, which can adjust the amount of drugs added to the first reaction tank 1 and the second reaction tank 2 according to different sewage types. The sludge in the sludge return pipeline 51 is returned to the second reaction tank 2, and part of the magnetic sludge in the magnetic precipitation area 4 is returned to the second reaction tank 2, which can be driven by a reflux pump arranged on the pipeline.

[0027] Example 2

[0028] The method for treating wastewater using the high-efficiency magnetic flocculation sedimentation treatment equipment of Example 1 comprises the following steps:

[0029] Step 1: sewage enters the first reaction tank 1 through the water inlet pipe 11, and the dosing system 3 adds coagulant and flocculant to the first reaction tank 1, wherein the coagulant is selected from polyaluminium chloride PAC, and the flocculant is selected from NJS-715 and NJS-705, and magnetic powder is added to the second reaction tank 2, and the sewage treated in the two reaction tanks becomes magnetic sludge;

[0030] The first reaction tank 1 pre-treats the sewage and flocculates it, and the flocculated sewage enters the second reaction tank 2 to generate magnetic sludge. The sewage passes through the first reaction tank 1 and the second reaction tank 2 to fully react with the coagulant, magnetic powder and flocculant, thereby improving the utilization rate of the coagulant, magnetic powder and coagulant aid, and at the same time enabling the sewage to settle better, thereby realizing the separation of sludge and water.

[0031] Step 2: The magnetic sludge enters the magnetic precipitation area 4, part of the magnetic sludge in the magnetic precipitation area 4 returns to the second reaction tank 2 to continue the reaction, part of the magnetic sludge enters the magnetic separation recovery area 5, and the sewage enters the post-precipitation area 6;

[0032] Step three, the magnetic separation recovery area 5 separates the magnetic powder in the magnetic sludge through the magnetic powder recovery box 52, and the separated magnetic powder is reused in the second reaction tank 2 (the separated magnetic powder can be taken out manually and then added to the dosing system 3 for dosing), and the separated sludge is returned to the second reaction tank 2 through the sludge return pipeline 51; in actual application, a magnetic powder recovery box 52 is set above the curved sludge return pipeline 51 to recover the magnetic powder, the magnetic powder dosage is 5,000 mg / L, the recovery amount reaches 4995 mg / L, and only 5 mg / L of supplementation is required.

[0033] Step 4: The post-sedimentation area 6 precipitates the sewage through the inclined tube sedimentation tank structure 61, and the precipitate enters the magnetic separation recovery area 5 for magnetic separation, and the supernatant is discharged.

[0034] The implementation modes of the present invention have been described in detail above in conjunction with specific embodiments, but the present invention is not limited to the above-mentioned implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A high-efficiency magnetic flocculation sedimentation treatment equipment, characterized in that: The invention comprises a first reaction tank (1), a second reaction tank (2), a dosing system (3), a magnetic precipitation area (4), a magnetic separation recovery area (5) and a post-precipitation area (6); the first reaction tank (1), the second reaction tank (2) and the magnetic precipitation area (4) are arranged adjacent to each other in sequence and are connected, and the dosing system (3) is connected to the first reaction tank (1) and the second reaction tank (2) respectively; the magnetic separation recovery area (5) and the post-precipitation area (6) are arranged adjacent to each other and are connected, and both are arranged adjacent to and connected to the magnetic precipitation area (4); a sludge return pipeline (51) with a curved structure is arranged at the bottom of the magnetic separation recovery area (5), the sludge return pipeline (51) is arranged horizontally, and a connected magnetic powder recovery box (52) is arranged on the upper part of the pipe body; the magnetic separation recovery area (5) is connected to the second reaction tank (2) through the sludge return pipeline (51); and an inclined tube sedimentation tank structure (61) is arranged inside the post-precipitation area (6).

2. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1 is characterized in that: The first reaction pool (1), the second reaction pool (2) and the magnetic precipitation area (4) are connected in sequence through a water pipe at the bottom; the magnetic precipitation area (4) and the post-precipitation area (6) are connected through holes in the side wall; the magnetic precipitation area (4) and the magnetic separation recovery area (5) are connected through a water pipe at the bottom; and the post-precipitation area (6) and the magnetic separation recovery area (5) are connected through a water pipe at the bottom.

3. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1 is characterized in that: The sludge return pipeline (51) has a curved structure, wherein the curved structure is a continuous "S"-shaped curved structure; and the magnetic powder recovery box (52) has a built-in magnet for adsorbing magnetic powder.

4. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1 is characterized in that: The magnetic precipitation area (4) and the bottom of the second reaction tank (2) are also connected to a sludge return pipeline.

5. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1 is characterized in that: The side wall of the first reaction tank (1) is connected to a water inlet pipe (11), and the side wall of the post-precipitation area (6) is connected to a water outlet pipe (62).

6. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1, characterized in that: Each area in the high-efficiency magnetic flocculation sedimentation treatment equipment is a skid-mounted structure.

7. The high-efficiency magnetic flocculation sedimentation treatment equipment according to claim 1 is characterized in that: The drug adding system (3) is provided with a PLC control system, which can adjust the amount of drug added to the first reaction tank (1) and the second reaction tank (2) according to different sewage types.

8. A method for treating wastewater using the high-efficiency magnetic flocculation sedimentation treatment equipment according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: The dosing system (3) adds coagulant and flocculant to the first reaction tank (1), and adds magnetic powder to the second reaction tank (2), and the sewage treated in the two reaction tanks becomes magnetic sludge; Step 2: the magnetic sludge enters the magnetic sedimentation area (4), part of the magnetic sludge in the magnetic sedimentation area (4) returns to the second reaction tank (2) to continue the reaction, part of the magnetic sludge enters the magnetic separation recovery area (5), and the sewage enters the post-sedimentation area (6); Step three, the magnetic separation recovery area (5) separates the magnetic powder in the magnetic sludge through the magnetic powder recovery box (52), the separated magnetic powder is recycled to the second reaction tank (2), and the separated sludge is recycled to the second reaction tank (2) through the sludge return pipeline (51); Step 4: The post-sedimentation area (6) precipitates the sewage through the inclined tube sedimentation tank structure (61), and the precipitate enters the magnetic separation recovery area (5) for magnetic separation, and the supernatant is discharged.

9. The method according to claim 8, characterized in that In step 1, the coagulant is selected from polyaluminium chloride PAC, and the flocculant is selected from NJS-715 and NJS-705.

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