Auxiliary purification device for circulating water of paint spray booth

Abstract

The utility model relates to an auxiliary purification device for circulating water of a spray booth, and belongs to the field of water pollution control and water treatment. The utility model discloses an auxiliary purification device for circulating water of a spray booth. The auxiliary purification device comprises a mounting chassis, a regulating unit, a flocculation unit, an electro-Fenton treatment unit, a secondary flocculation unit, a precipitation unit and a reflux device, wherein the regulating unit comprises a water inlet pipe, a turbidity monitor I, an automatic water inlet valve, a regulating tank, an acid-base regulator I and a stirring device I; one end of the water inlet pipe is connected with the water inlet end of the adjusting tank, the other end of the water inlet pipe is directly connected with the paint spray booth water containing tank, and the automatic water inlet valve is arranged on the water inlet pipe and controlled by the first turbidity monitor to be opened and closed. According to the utility model, the backflow device, the detachable module and the like are adopted, so that the generation amount of iron mud in the traditional Fenton oxidation process is greatly reduced, the disassembly is simple and convenient, local modules can be replaced, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of spraying industrial wastewater treatment and reuse, in particular to an auxiliary purification device for circulating water in a spray booth, belonging to the field of water pollution control and water treatment. Background Art

[0002] At present, industrial spraying operations are usually carried out in a water curtain spray booth. Utilizing the characteristic that water-based paint is miscible with water, in actual spraying operations, the water curtain in the spray booth flows into a sump after absorbing paint mist, and then is discharged into a circulation water tank through a water pump for cyclic absorption and use.

[0003] The resulting absorption wastewater will show phenomena such as high turbidity, complex composition, deterioration, and odor after multiple cycles, affecting the normal progress of production. If directly discharged, it will cause serious environmental hazards, and the research on treatment processes has become an urgent problem to be solved.

[0004] At present, in practice, biochemical treatment or physicochemical treatment methods are mostly used for wastewater purification. For the first method, microorganisms are used to decompose organic matter in the wastewater, thereby purifying the spray painting wastewater. However, it is necessary to domesticate microorganisms for a long time, and the biological toxicity of the wastewater is relatively high, and the sludge age is relatively short. Its treatment time is long, the treatment effect is unstable, and the treatment cost is relatively high. For the second method, liquid products are directly added to the wastewater. Its principle is the adsorption and decomposition method. Agent A and Agent B are used in combination to remove the paint viscosity and then coagulate the paint slag to float, forming the effect of paint-water separation. After that, the paint slag is removed by manual fishing to achieve wastewater purification. If the paint slag cannot be fished out in time after floating, a large amount of paint slag will sink to the bottom, easily causing the paint slag to accumulate at the bottom of the water tank, making the fishing operation more difficult, and the water content of the paint slag is relatively large after being fished out, resulting in relatively high subsequent treatment costs.

[0005] Therefore, there is an urgent need to provide an auxiliary purification device for circulating water in a spray booth to solve the problems of treating circulating water in the existing spraying process. Summary of the Utility Model

[0006] To solve the above problems, the utility model proposes an auxiliary purification device for circulating water in a spray booth, which reduces the discharge of iron-containing sludge, saves the dosage of Fe2+ in the Fenton oxidation unit in the advanced treatment of sewage, reduces the treatment cost, effectively increases the effective circulation times of the circulating water in the water curtain spray booth, and reduces the water use cost, solving the problems raised in the background art.

[0007] To achieve the above object, the utility model proposes an auxiliary purification device for circulating water in a spray booth, comprising:

[0008] Installation chassis, adjustment unit, flocculation unit, electro-Fenton treatment unit, secondary flocculation unit, sedimentation unit, and reflux device: The adjustment unit includes a water inlet pipe, a first turbidity monitor, an automatic water inlet valve, an adjustment tank, a first acid-base regulator, and a first stirring device. One end of the water inlet pipe is connected to the water inlet end of the adjustment tank, and the other end is directly connected to the water storage tank of the spray booth. The automatic water inlet valve is arranged on the water inlet pipe and is controlled by the first turbidity monitor to open and close. The water outlet end of the adjustment unit is connected to the water inlet pipe of the flocculation unit. The flocculation unit includes a second stirring device and a primary flocculation tank. The water outlet end of the flocculation unit is connected to the water inlet pipe of the electro-Fenton treatment unit. The electro-Fenton treatment unit includes an electro-Fenton treatment tank, a second acid-base regulator, an energy supply power source, a reaction cathode, and a reaction anode. The water outlet end of the electro-Fenton treatment unit is connected to the water inlet pipe of the secondary flocculation unit. The secondary flocculation unit includes the secondary flocculation tank, a third acid-base regulator, and a third stirring device. The water outlet end of the secondary flocculation unit is connected to the water inlet pipe of the sedimentation unit. The sedimentation unit includes a secondary sedimentation tank, a water inlet baffle, a water outlet valve, and a second turbidity monitor. The water outlet valve is connected to the circulating water tank of the spray booth and is controlled by the second turbidity monitor. The reflux device includes a sludge reflux device and a water outlet reflux device. Among them, the sludge reflux device includes a sludge reflux pipe, a sludge discharge pipe, and a sludge reflux pump. The sludge reflux device is connected to the bottom of the secondary sedimentation tank and is used to reflux the sludge to the electro-Fenton treatment unit for reuse. The water outlet reflux device includes a water outlet pipe, a water outlet reflux switch, a water outlet reflux pipe, and a water outlet reflux pump. The water outlet reflux device is controlled by the second turbidity monitor to reflux the water outlet to the flocculation unit for re-treatment. Each unit is connected by a flexible hose. Each unit is loaded on an independent chassis, and the chassis are connected by detachable nuts.

[0009] Beneficial effects

[0010] The modular design adopted by the present utility model makes the disassembly, replacement, and maintenance of the equipment convenient and fast. When a local failure occurs, it can be replaced at any time to ensure the water treatment efficiency.

[0011] The sludge reflux device adopted by the present utility model enables the iron ions in the iron sludge to be recycled, reduces the chemical agent cost and the sludge treatment cost, and has low emissions and low pollution.

[0012] The water outlet reflux device adopted by the present utility model enables the water outlet to be recycled, reaches the artificially set water quality index, realizes the qualified discharge of water quality, thereby greatly improving the water quality recycling rate and reducing the water resource consumption. Description of the drawings

[0013] Figure 1 It is a three-dimensional structure schematic diagram of the present new type.

[0014] Figure 2Schematic diagram of the three - dimensional sectional structure of the first turbidity monitor, installation chassis and regulation tank of the present utility model.

[0015] Figure 3 Schematic diagram of the three - dimensional sectional structure of the power supply, reaction cathode and reaction anode of the present utility model.

[0016] Figure 4 Schematic diagram of the three - dimensional sectional structure of the third acid - base regulator, secondary flocculation tank and third stirring device of the present utility model.

[0017] Figure 5 Schematic diagram of the three - dimensional sectional structure of the secondary sedimentation tank and the inlet baffle of the present utility model.

[0018] Figure 6 Schematic diagram of the three - dimensional sectional structure of the sludge discharge pipe, sludge return pipe and sludge return pump of the present utility model.

[0019] Figure 7 Schematic diagram of the three - dimensional sectional structure of the outlet pipe, outlet water return switch and outlet water return pipe of the present utility model.

[0020] The markings in the figure are: 1 - inlet pipe, 2 - first turbidity monitor, 3 - automatic inlet valve, 4 - installation chassis, 5 - regulation tank, 6 - first acid - base regulator, 7 - first stirring device, 8 - detachable nut, 9 - second stirring device, 10 - primary flocculation tank, 11 - electro - Fenton treatment tank, 1101 - third stirring device, 1102 - second acid - base regulator, 12 - power supply, 13 - reaction cathode, 14 - reaction anode, 15 - secondary flocculation tank, 1501 - third acid - base regulator, 16 - secondary sedimentation tank, 1601 - second turbidity monitor, 17 - inlet baffle, 18 - sludge return pipe, 19 - sludge discharge pipe, 20 - sludge return pump, 21 - outlet pipe, 22 - outlet water return switch, 23 - outlet water return pipe, 24 - outlet water return pump. Specific embodiments

[0021] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings.

[0022] For a clearer understanding of the technical features, objectives and effects of the present utility model, the specific embodiments of the present utility model are now described with reference to the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0023] Refer to Figure 1-7 As shown, the present utility model provides an auxiliary purification device for the circulating water in a spray booth, including: installation chassis 4, regulation unit, flocculation unit, electro - Fenton treatment unit, secondary flocculation unit, sedimentation unit;

[0024] Each unit is loaded on an independent chassis, and the independent chassis are connected by detachable nuts 8.

[0025] The regulating unit is used to regulate the water volume and water quality of the device for water inlet, and is internally provided with a first stirring device 7 for stirring the water body to make the water body in a uniformly mixed state. When the first turbidity monitor 2 detects that the turbidity of the water body in the paint spraying booth sump exceeds a certain index, the automatic water inlet valve 3 is opened to introduce the spray process wastewater into the regulating tank 5, and the pH value of the wastewater is adjusted to 8.5 - 9 by the first acid-base regulator 6. After the adjustment is completed, the wastewater flows into the primary flocculation tank 10.

[0026] A second stirring device 9 is provided in the flocculation unit. After the wastewater enters the primary flocculation tank 10, flocculant PAC and coagulant aids CaCl2 and Ca2+ are added to demulsify the spray wastewater. Among them, PAC combines with the suspended substances in the wastewater to form flocs, and most of the suspended substances in the water are removed through the flocculation mechanism, reducing the load on the subsequent electro-Fenton treatment. Subsequently, it flows through the water outlet into the electro-Fenton treatment unit for in-depth treatment.

[0027] An electro-Fenton treatment device is provided on the electro-Fenton treatment tank 11. The electro-Fenton treatment device includes a reaction cathode 13 and a reaction anode 14. The anode is a replaceable iron sheet, and the cathode is a replaceable graphite plate. The pH of the wastewater is adjusted to 4 - 5 by the second acid-base regulator 1102, then the catalyst ferrous sulfate required for the electro-Fenton reaction is added, and the power supply 12 and the third stirring device 1101 are turned on for reaction. After 2 hours of reaction, the wastewater flows through the water outlet into the secondary flocculation tank 15.

[0028] The main function of the secondary flocculation tank 15 is to adjust the pH value of the wastewater through the third acid-base regulator 1501, so that a large amount of iron ions in the wastewater form iron hydroxide precipitates for removal. The secondary flocculation tank 15 only needs to add sodium hydroxide and hydrochloric acid to adjust the pH, and there is no need to add additional flocculants.

[0029] The wastewater with the acid-base adjustment completed is introduced into the secondary sedimentation tank 16 for sedimentation. An inlet baffle 17 is provided at the water inlet end of the sedimentation tank to prevent the water flow from being too large and affecting sedimentation, resulting in a decrease in treatment efficiency. The precipitated iron sludge is discharged through the bottom sludge discharge pipe 19. Among them, part of the sludge is refluxed to the electro-Fenton treatment unit for iron sludge reuse under the action of the sludge reflux pipe 18 and the sludge reflux pump 20. The treated wastewater is monitored by the second turbidity monitor 1601 at the water outlet end. After passing the monitoring, it is discharged into the circulating water tank of the water curtain paint spraying booth for use. If the turbidity of the wastewater is still too high, the water outlet reflux switch 22 is turned on under the action of the turbidity monitor, and it is refluxed to the primary flocculation tank 10 for cyclic treatment through the water outlet reflux pipe 23 and the water outlet reflux pump 24 until the turbidity meets the effluent standard.

[0030] The above embodiments are only for illustrating the technical concept and features of the present utility model, and the purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. It is not intended to limit the protection scope of the present utility model. Any equivalent changes or modifications made according to the spirit of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. An auxiliary purification device for circulating water in a paint spraying room, comprising a mounting chassis (4), a regulating unit, a flocculation unit, an electro-Fenton treatment unit, a secondary flocculation unit, a sedimentation unit, and a reflux device; the regulating unit comprises a water inlet pipe (1), a No. 1 turbidity monitor (2), an automatic water inlet valve (3), a regulating tank (5), a No. 1 acid-base regulator (6), and a No. 1 stirring device (7); the flocculation unit comprises a No. 2 stirring device (9) and a primary flocculation tank (10); the electro-Fenton treatment unit comprises an electro-Fenton The invention relates to a treatment tank (11), a second acid-base regulator (1102), an energy supply (12), a reaction cathode (13) and a reaction anode (14); the secondary flocculation unit comprises a secondary flocculation tank (15), a third acid-base regulator (1501) and a third stirring device (1101); the sedimentation unit comprises a secondary sedimentation tank (16), a water inlet baffle (17), a water outlet valve and a second turbidity monitor (1601); the reflux device comprises a sludge reflux device and a effluent reflux device; wherein, The sludge return device comprises a sludge return pipe (18), a sludge discharge pipe (19) and a sludge return pump (20), and the outlet water return device comprises an outlet water pipe (21), an outlet water return switch (22), an outlet water return pipe (23) and an outlet water return pump (24); the characteristics are: One end of the water inlet pipe (1) is connected to the water inlet end of the regulating tank (5), and the other end is directly connected to the water storage tank of the paint spraying room. The automatic water inlet valve (3) is arranged on the water inlet pipe (1), and is opened and closed by the No. 1 turbidity monitor (2); the water outlet end of the regulating unit is connected to the water inlet pipe (1) of the flocculation unit; the water outlet end of the flocculation unit is connected to the water inlet pipe (1) of the electro-Fenton treatment unit; the water outlet end of the electro-Fenton treatment unit is connected to the water inlet pipe (1) of the secondary flocculation unit; the water outlet end of the secondary flocculation unit is connected to the water inlet pipe (1) of the sedimentation unit; the water outlet valve is connected to the circulating water tank of the paint spraying room; the sludge return device is connected to the bottom of the secondary sedimentation tank (16); The effluent return device is connected to the primary flocculation tank.

2. An auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: The opening and closing of the automatic water inlet valve is controlled by the No. 1 turbidity monitor (2).

3. The auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: The effluent return device is controlled by a turbidity monitor.

4. The auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: The sludge return device can return the sludge generated by the sedimentation unit to the electro-Fenton treatment unit for reuse.

5. The auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: The outlet valve, under the control of the No. 2 turbidity monitor (1601), returns the outlet water to the flocculation unit for further treatment.

6. The auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: Each unit is connected by a hose.

7. The auxiliary purification device for circulating water in a paint spraying room according to claim 1, characterized in that: Each unit is mounted on an independent chassis, and the chassis are connected by detachable nuts (8).

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