Integrated treatment device for electrolytic aluminum production wastewater

Abstract

The utility model provides an electrolytic aluminum production wastewater integrated treatment device which comprises a box body and a water inlet pipe connected with the box body, a flocculation regulating tank, a reaction transition tank, an air floatation tank, a sand filter tank, an activated carbon filter tank and a clear water tank are sequentially arranged in the box body in a separated mode through partition plates, and a filter frame defined by grids is arranged on the upper portion in the flocculation regulating tank. The water inlet pipe is communicated with the filtering frame, an intercepting net bag is sleeved in the filtering frame, and the aperture of the intercepting net bag is smaller than that of the grating; according to the utility model, integrated equipment is adopted, so that the occupied area is small, the construction cost is low, the water treatment efficiency is not influenced, and the discharge index of main pollutants in effluent meets the water quality control standard of taking reclaimed water as circulating cooling water in Design Specification of Wastewater Recycling Engineering GB50335-2002; according to the utility model, the grating and the intercepting net bag with smaller aperture are adopted for intercepting, so that sundries can be intercepted more effectively and are convenient to clean; the design is reasonable and the process is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an integrated treatment device for electrolytic aluminum production wastewater. Background Art

[0002] The production wastewater of an electrolytic aluminum plant mainly comes from equipment cooling water, waste water discharged from the waste heat boiler room and chemical water treatment, backwashing water of the circulating water system, and floor flushing water of each workshop during the production process. It is characterized by high suspended solids and high dissolved salts.

[0003] Due to the complex process and long flow of the electrolytic aluminum production system, some production water systems are open systems, and sundries such as branches and stones often enter. Therefore, a grille needs to be set in the production return water system. However, the existing system usually uses a coarse grille, which cannot completely block the sundries in the production wastewater system.

[0004] Secondly, the current treatment process is as follows: after the grid residues are intercepted by the grille, they are concentrated and stacked and then transported out. After the wastewater is lifted by the lift pump after passing through the grille, it enters the regulation tank, and the coagulant PAC (poly aluminum chloride) and the coagulant aid PAM (acrylamide) are respectively added through the metering chemical dosing pump, and the chemical dosing amount of the automatic control chemical dosing equipment is controlled. The wastewater added with the coagulant and the flocculant is fully mixed in the pipeline mixer and then enters the integrated water purifier to achieve sedimentation separation and filtration. This process equipment has the problems of large floor area and high energy consumption. Content of the Utility Model

[0005] The utility model aims to provide an integrated treatment device for electrolytic aluminum production wastewater, which can solve the problem that the grille cannot completely block the sundries in the production wastewater system, and at the same time is convenient for collecting sundries, has a small floor area, strong treatment capacity, low energy consumption, and the effluent water quality can meet the water quality control standard for reclaimed water as circulating cooling water in the Design Code for Reclaimed Water Reuse Project GB50335 - 2002.

[0006] For this reason, the technical solution adopted by the present utility model is as follows: An integrated treatment device for electrolytic aluminum production wastewater includes a box body and a water inlet pipe connected to the box body. Inside the box body, a flocculation adjustment tank, a reaction transition tank, a flotation tank, a sand filtration tank, an activated carbon filtration tank, and a clear water tank are sequentially separated by partition plates. In the upper part of the flocculation adjustment tank, a filter frame surrounded by a grid is provided. The water inlet pipe is connected to the filter frame. An interception net bag is sleeved inside the filter frame. The aperture of the interception net bag is smaller than that of the grid. Outside the flocculation adjustment tank, a PAC dosing device and a PMC dosing device are provided. The bottom of the flocculation adjustment tank is connected to the reaction transition tank through a water passing hole. An upper part of the partition plate between the reaction transition tank and the flotation tank is provided with a water passing hole. The bottom of the flotation tank is provided with a water passing hole connected to the bottom of the sand filtration tank. In the middle of the sand filtration tank, a filler rack is provided, and filter sand is filled in the filler rack. The bottom of the sand filtration tank is provided with a sedimentation inclined plate. An upper part of the partition plate between the sand filtration tank and the activated carbon filtration tank is provided with a water passing hole. The bottom of the activated carbon filtration tank is connected to the clear water tank through a water passing hole. Outside the clear water tank, a disinfectant dosing device is provided.

[0007] Further preferably, the gap of the grid of the filter frame is 8 - 10 cm, and the gap of the interception net bag is 2 cm * 2 cm. A border is formed by the grid, and then the interception net bag with a smaller aperture is placed inside the filter frame, which can ensure that impurities in the water do not enter the flocculation adjustment tank. When there are too many impurities, the interception net bag can be taken out for cleaning and then used again, which is convenient for collecting sundries.

[0008] Further preferably, both the PAC dosing device and the PMC dosing device include a medicine storage tank. The medicine storage tank is connected to the upper dosing port of the flocculation adjustment tank through a dosing pipe, and a metering pump is provided on the dosing pipe. It can achieve automatic metering and dosing.

[0009] Further preferably, a submersible agitator is provided on one side of the bottom of the flocculation sedimentation tank away from the reaction transition tank. A submersible agitator is provided in the flocculation adjustment tank to ensure that the sewage in the flocculation adjustment tank can fully contact with the medicine and react. A submersible pump is provided between the sand filtration tank and the activated carbon filtration tank to ensure that the wastewater in the flotation tank can smoothly enter the activated carbon filtration tank after being filtered by the sand layer, ensuring the filtration effect.

[0010] Further preferably, a sludge discharge pipe is provided at the bottom of the sand filtration tank, and a backwash pipe is provided at the top of the sand filtration tank. The backwash pipe is connected to the clear water tank, and a backwash pump is provided on the backwash pipe. The sand and gravel filler in the sand filtration tank is backwashed through the backwash pipe to ensure the filtration effect.

[0011] More preferably, the disinfectant dosing device also includes a medicine storage box, which is connected to the upper dosing port of the clean water tank through a dosing pipe, and a metering pump is provided on the dosing pipe, so that automatic metering dosing can be achieved.

[0012] The utility model has the following beneficial effects: the utility model adopts integrated equipment, occupies a small area, has low construction cost, and does not affect the water treatment efficiency. The emission indicators of major pollutants in the effluent meet the water quality control standards for recycled water as circulating cooling water in the "Design Code for Wastewater Recycling Engineering" GB50335-2002; the utility model adopts grids and interception net bags with smaller apertures to intercept, which can more effectively intercept debris and facilitate cleaning; the design is reasonable and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, an integrated treatment device for wastewater from electrolytic aluminum production includes a box body 1 and a water inlet pipe 10 connected to the box body 1. A flocculation adjustment tank 2, a reaction transition tank 3, an air flotation tank 4, a sand filter tank 5, an activated carbon filter tank 6, and a clean water tank 7 are sequentially separated by a partition in the box body 1. A filter frame 8 surrounded by a grille 801 is arranged on the upper part of the flocculation adjustment tank 2. The water inlet pipe 10 is connected to the filter frame 8. An interception net bag 802 is sleeved in the filter frame 8. The aperture of the interception net bag 802 is smaller than the aperture of the grille 801. A PAC dosing device 201 and a PMC dosing device are arranged outside the flocculation adjustment tank 2. 202, the bottom of the flocculation adjustment tank 2 is connected with the reaction transition tank 3 through a water hole, the upper part of the partition between the reaction transition tank 3 and the flotation tank 4 is provided with a water hole, the bottom of the flotation tank 4 is provided with a water hole connected with the bottom of the sand filter tank 5, the middle part of the sand filter tank 5 is provided with a stuffing rack, the stuffing rack is filled with filter sand, the bottom of the sand filter tank 5 is provided with a sedimentation inclined plate 502, the upper part of the partition between the sand filter tank 5 and the activated carbon filter tank 6 is provided with a water hole, the bottom of the activated carbon filter tank 6 is connected with the clean water tank 7 through the water hole, and a disinfectant dosing device 701 is provided outside the clean water tank 7.

[0016] The gap between the grid 801 of the filter frame 8 is 8 to 10 cm, and the gap between the interception net bag 802 is 2 cm*2 cm. The grid 801 forms a frame, and the interception net bag 802 with a smaller aperture is placed in the filter frame 8, which can ensure that impurities in the water do not enter the flocculation adjustment tank 2. When there are too many impurities, the interception net bag 802 can be taken out and cleaned before continuing to use, which is convenient for collecting debris.

[0017] Both the PAC dosing device 201 and the PMC dosing device 202 include a chemical storage tank. The chemical storage tank is connected to the upper chemical dosing port of the flocculation adjustment tank 2 through a chemical dosing pipe, and a metering pump is provided on the chemical dosing pipe. Automatic metering and chemical dosing can be achieved.

[0018] A submersible agitator 11 is provided at the bottom of the flocculation sedimentation tank on the side far from the reaction transition tank 3. A submersible agitator 11 is provided in the flocculation adjustment tank 2 to ensure that the sewage in the flocculation adjustment tank 2 can fully contact the drug and react; a submersible pump is provided between the sand filtration tank 5 and the activated carbon filtration tank 6. Through the power of the submersible pump, the wastewater in the sand filtration tank 5 is transported to the activated carbon filtration tank 6 for adsorption treatment with activated carbon, ensuring that the wastewater in the air flotation tank 4 can smoothly enter the activated carbon filtration tank 6 after passing through the sand layer filtration, and preventing the wastewater in the sand filtration tank 5 from not being able to enter the activated carbon filtration tank 6 through the water passing holes due to excessive sludge accumulation in the sand filtration tank 5, thus ensuring the filtration effect.

[0019] A sludge discharge pipe 501 is provided at the bottom of the sand filtration tank 5, and a backwash pipe 9 is provided at the top of the sand filtration tank 5. The backwash pipe 9 is connected to the clear water tank, and a backwash pump is provided on the backwash pipe 9. Backwashing is carried out on the sand and gravel filler in the sand filtration tank 5 through the backwash pipe 9 to ensure the filtration effect. A sedimentation inclined plate 502 is provided at the bottom of the sand filtration tank 5 to facilitate the sedimentation and removal of sludge.

[0020] The disinfectant dosing device 701 also includes a chemical storage tank. The chemical storage tank is connected to the upper chemical dosing port of the clear water tank through a chemical dosing pipe, and a metering pump is provided on the chemical dosing pipe. Automatic metering and chemical dosing can be achieved.

[0021] The utility model adopts an integrated device, which has a small floor area, low construction cost, and does not affect the water treatment efficiency. The discharge indexes of the main pollutants in the effluent meet the water quality control standards for reclaimed water as circulating cooling water in the "Code for Design of Sewage Reclamation and Reuse Engineering" GB50335 - 2002; the utility model uses a grille 801 and an interception net bag 802 with a smaller aperture for interception, which can intercept sundries more effectively and is convenient for cleaning; the design is reasonable and the process is simple.

[0022] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. An integrated treatment device for electrolytic aluminum production wastewater, characterized in that: The invention comprises a housing (1) and a water inlet pipe (10) connected to the housing (1); a flocculation adjustment tank (2), a reaction transition tank (3), an air flotation tank (4), a sand filter tank (5), an activated carbon filter tank (6), and a clean water tank (7) are sequentially arranged in the housing (1) through a partition plate; a filter frame (8) surrounded by a grille (801) is arranged at the upper part of the flocculation adjustment tank (2); the water inlet pipe (10) is connected to the filter frame (8); an interception net bag (802) is sleeved in the filter frame (8); the aperture of the interception net bag (802) is smaller than the aperture of the grille (801); a PAC dosing device (201) and a PMC dosing device (202) are arranged outside the flocculation adjustment tank (2); The bottom of the flocculation adjustment tank (2) is connected to the reaction transition tank (3) through a water hole, the upper part of the partition between the reaction transition tank (3) and the flotation tank (4) is provided with a water hole, the bottom of the flotation tank (4) is provided with a water hole connected to the bottom of the sand filter tank (5), the middle part of the sand filter tank (5) is provided with a filling frame, the filling frame is filled with filter sand, the bottom of the sand filter tank (5) is provided with a sedimentation inclined plate (502), the upper part of the partition between the sand filter tank (5) and the activated carbon filter tank (6) is provided with a water hole, the bottom of the activated carbon filter tank (6) is connected to the clean water tank (7) through the water hole, and a disinfectant dosing device (701) is provided outside the clean water tank (7).

2. The integrated treatment device for electrolytic aluminum production wastewater according to claim 1 is characterized in that: The gap between the grille (801) of the filter frame (8) is 8 to 10 cm, and the gap between the intercepting net bag (802) is 2 cm*2 cm.

3. The integrated treatment device for electrolytic aluminum production wastewater according to claim 1 is characterized in that: The PAC dosing device (201) and the PMC dosing device (202) both comprise a drug storage box, the drug storage box being connected to the upper drug adding port of the flocculation adjustment tank (2) via a drug adding pipe, and a metering pump is provided on the drug adding pipe.

4. The integrated treatment device for electrolytic aluminum production wastewater according to any one of claims 1 to 3, characterized in that: A submersible flow propeller (11) is provided on one side of the bottom of the flocculation adjustment tank (2) away from the reaction transition tank (3).

5. The integrated treatment device for electrolytic aluminum production wastewater according to claim 4 is characterized in that: A mud discharge pipe (501) is provided at the bottom of the sand filter tank (5), a backwash pipe (9) is provided at the top of the sand filter tank (5), the backwash pipe (9) is connected to the clean water tank (7), and a backwash pump is provided on the backwash pipe (9).

6. The integrated treatment device for electrolytic aluminum production wastewater according to claim 5 is characterized in that: The disinfectant dosing device (701) also comprises a medicine storage box, which is connected to the upper dosing port of the clean water tank (7) via a dosing pipe, and a metering pump is provided on the dosing pipe.

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