Paint spraying sewage treatment process and equipment

Abstract

The invention provides a paint spraying sewage treatment process and equipment. The paint spraying sewage treatment process comprises the following steps: S1, sewage pretreatment: pH adjustment: adjusting the pH of sewage to 6.0-6.5 by using caustic soda flakes or hydrochloric acid; s2, adding a water purifying agent: carrying out adsorption reaction, namely adding the water purifying agent according to 0.5-1% of the volume of the sewage, and stirring for 20 minutes at the stirring rotating speed of 300rpm; s3, addition of an auxiliary agent: flocculent precipitation: adding the auxiliary agent according to 0.1-0.3% of the volume of the sewage, stirring for 10 minutes at the stirring rotating speed of 50 rpm, and standing for 30 minutes; s4, paint slag separation: air flotation separation: the paint slag floats upwards through an air flotation machine and is collected and treated through a slag scraper; and S5, clear water recycling: deeply filtering, namely filtering the clear water through a multi-medium filter, and recycling the filtered clear water. The paint spraying sewage treatment process and equipment provided by the invention have the advantages of being relatively environment-friendly and relatively high in treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a process and equipment for treating sewage from spray painting. Background Art

[0002] In the treatment of paint wastewater, most of the paint wastewater treatments currently used in the market are chemical treatments, with the main raw materials being melamine, formaldehyde, and hydrochloric acid as agent A, and anionic polyacrylamide or cationic polyacrylamide as agent B. A small number of paint wastewater treatments are treated with lithium-based bentonite as agent A, but the disadvantage is that the melamine formaldehyde method for treating paint wastewater causes metal salts and organic matter to accumulate in the wastewater, and it cannot be recycled for a long time. Lithium-based bentonite can also treat paint wastewater, but the paint residue is fine, and the effect of removing the paint residue mechanically or manually is poor.

[0003] Therefore, it is necessary to provide a new paint spraying wastewater treatment process and equipment to solve the above technical problems. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a paint spraying wastewater treatment process and equipment which is more environmentally friendly and has higher treatment efficiency.

[0005] In order to solve the above technical problems, the paint spraying wastewater treatment process and equipment provided by the present invention include the following steps:

[0006] S1: Wastewater pretreatment:

[0007] pH adjustment: Use caustic soda flakes or hydrochloric acid to adjust the wastewater pH to 6.0-6.5;

[0008] S2: Water purification agent addition:

[0009] Adsorption reaction: add water purifier at 0.5%-1% of the sewage volume, stir for 20 minutes, and the stirring speed is 300rpm;

[0010] S3: Addition of additives:

[0011] Flocculation sedimentation: add additives at 0.1%-0.3% of the sewage volume, stir for 10 minutes at a stirring speed of 50rpm, and let stand for 30 minutes;

[0012] S4: Paint residue separation:

[0013] Air flotation separation: paint residue is floated by air flotation machine and collected and processed by scraper;

[0014] S5: Clean water reuse:

[0015] Deep filtration: Clean water is filtered through a multi-media filter and then reused.

[0016] Preferably, in S1, NaOH or HCl is used to adjust the pH of the sewage to 6.0-6.5.

[0017] Preferably, the multi-media filter is made of quartz sand and activated carbon, with a filtration accuracy of 10 μm and a flow rate of 5 m 3 / h.

[0018] The present invention also provides a paint spraying wastewater treatment device, including a treatment box 1, wherein the treatment box 1 is provided with a mixing and stirring area 2, an air flotation separation area 3 and a paint residue separation area 4, and one side of the treatment box 1 is provided with a paint residue collection box 16 connected to the paint residue separation area 4, and a multi-media filter 18 is fixedly installed on the paint residue collection box 16.

[0019] Preferably, a mounting plate 5 is provided on the top of the mixing and stirring zone 2, a stirring motor 6 is fixedly installed on the top of the mounting plate 5, a stirring rod 7 is fixedly installed on the output shaft of the stirring motor 6, and the bottom end of the stirring rod 7 extends into the mixing and stirring zone 2 and is fixedly installed with a plurality of stirring blades 8.

[0020] Preferably, a main air pipe 10 of a flotation machine is provided at the top of the flotation separation zone 3, and a plurality of linearly distributed branch pipes 11 are fixedly installed at the bottom end of the main air pipe 10 of the flotation machine. The bottom end of the branch pipe 11 extends into the flotation separation zone 3 and is fixedly installed with a flotation head 12. A submersible pump 9 is provided in the flotation separation zone 3, and the water inlet end of the submersible pump 9 is connected to the mixing and stirring zone 2. An inclined plate 13 is provided on the side of the flotation separation zone 3 away from the mixing and stirring zone 2.

[0021] Preferably, a scraper is fixedly installed on the top of the paint residue separation area 4 , and the scraper includes a scraper conveyor belt 14 , and a plurality of scrapers 15 are fixedly installed on the outer side of the scraper conveyor belt 14 .

[0022] Preferably, the inner wall of the bottom of the paint residue collection box 16 is inclined, and a separation cylinder 17 is fixedly installed at the bottom of the paint residue collection box 16. The top of the separation cylinder 17 extends into the paint residue collection box 16, and a plurality of filter holes are opened on the top of the separation cylinder 17.

[0023] Preferably, a water pump 19 is fixedly installed in the multi-media filter 18, the water inlet end of the water pump 19 is connected to the separation cylinder 17, the water outlet end of the water pump 19 is located in the multi-media filter 18, quartz sand and activated carbon are provided in the multi-media filter 18, a drain pipe 20 is provided on one side of the multi-media filter 18, a valve is provided in the drain pipe 20, one end of a recovery pipe 21 is provided at the bottom of the multi-media filter 18, a water tank 22 is fixedly installed on the other end of the recovery pipe 21, the water tank 22 is fixedly connected to the treatment box 1, and the water tank 22 is connected to the treatment box 1.

[0024] Preferably, a plurality of feed pipes 23 are provided in the processing box 1 , a bottom plate 24 is fixedly mounted on the bottom of the processing box 1 , and the multi-media filter 18 is fixedly mounted on the top of the multi-media filter 18 .

[0025] Compared with the related art, the paint spraying wastewater treatment process and equipment provided by the present invention have the following beneficial effects:

[0026] The present invention provides a paint spraying wastewater treatment process and equipment, which can quickly and conveniently treat paint residues, the water content of the obtained paint residues is less than 40%, the COD removal rate is 90%, the clean water reuse rate is 85%, and the treatment cycle can be shortened to less than 2 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of the paint spraying wastewater treatment process provided by the present invention;

[0028] Figure 2 A schematic diagram of the structure of the paint spraying wastewater treatment equipment provided by the present invention;

[0029] Figure 3 for Figure 2 The cross-sectional structural diagram shown;

[0030] Figure 4 for Figure 3 The schematic diagram of the installation structure of the mounting plate, stirring motor, stirring rod and stirring blade shown in the figure;

[0031] Figure 5 for Figure 3 The structural schematic diagram of the inclined plate shown;

[0032] Figure 6 for Figure 3 The structural schematic diagram of the scraper shown;

[0033] Figure 7 for Figure 3 Schematic diagram of the connection structure of the paint residue collection box and the separation cylinder shown.

[0034] Numbers in the figure: 1. treatment box, 2. mixing and stirring area, 3. flotation separation area, 4. paint residue separation area, 5. mounting plate, 6. stirring motor, 7. stirring rod, 8. stirring blade, 9. submersible pump, 10. main air pipe, 11. branch pipe, 12. flotation head, 13. inclined plate, 14. scraper conveyor belt, 15. scraper, 16. paint residue collection box, 17. separation cylinder, 18. multi-media filter, 19. water pump, 20. drain pipe, 21. recovery pipe, 22. water tank, 23. feed pipe, 24. bottom plate. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0036] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 ,in, Figure 1 A flow chart of the paint spraying wastewater treatment process provided by the present invention; Figure 2 A schematic diagram of the structure of the paint spraying wastewater treatment equipment provided by the present invention; Figure 3 for Figure 2 The cross-sectional structural diagram shown; Figure 4 for Figure 3 The schematic diagram of the installation structure of the mounting plate, stirring motor, stirring rod and stirring blade shown in the figure; Figure 5 for Figure 3 The structural schematic diagram of the inclined plate shown; Figure 6 for Figure 3 The structural schematic diagram of the scraper shown; Figure 7 for Figure 3 The schematic diagram of the connection structure of the paint residue collection box and the separation cylinder is shown. The paint spraying wastewater treatment process and equipment include the following steps:

[0037] S1: Wastewater pretreatment:

[0038] pH adjustment: Use caustic soda (NaOH) or hydrochloric acid (HCl) to adjust the wastewater pH to 6.0-6.5;

[0039] S2: Water purification agent addition:

[0040] Adsorption reaction: add water purifier at 0.5%-1% of the sewage volume, stir for 20 minutes, and the stirring speed is 300rpm;

[0041] S3: Addition of additives:

[0042] Flocculation sedimentation: add additives at 0.1%-0.3% of the sewage volume, stir for 10 minutes at a stirring speed of 50rpm, and let stand for 30 minutes;

[0043] S4: Paint residue separation:

[0044] Air flotation separation: paint residue is floated by air flotation machine and collected and processed by scraper;

[0045] S5: Clean water reuse:

[0046] Deep filtration: Clean water is filtered through a multi-media filter and then reused.

[0047] The multi-media filter is made of quartz sand and activated carbon, with a filtration accuracy of 10 μm and a flow rate of 5 m3 / h.

[0048] The separated paint residue can be dehydrated by a belt filter press to control the water content of the paint residue to ≤40%.

[0049] The present invention also provides a paint spraying wastewater treatment device, including a treatment box 1, wherein the treatment box 1 is provided with a mixing and stirring area 2, an air flotation separation area 3 and a paint residue separation area 4, and one side of the treatment box 1 is provided with a paint residue collection box 16 connected to the paint residue separation area 4, and a multi-media filter 18 is fixedly installed on the paint residue collection box 16.

[0050] A probe of a pH online monitor may be arranged in the mixing and stirring zone 2 to quickly detect the pH value of the mixing and stirring zone 2 .

[0051] A mounting plate 5 is provided on the top of the mixing and stirring zone 2, a stirring motor 6 is fixedly mounted on the top of the mounting plate 5, a stirring rod 7 is fixedly mounted on the output shaft of the stirring motor 6, and the bottom end of the stirring rod 7 extends into the mixing and stirring zone 2 and is fixedly mounted with a plurality of stirring blades 8.

[0052] A main air pipe 10 of a flotation machine is provided at the top of the flotation separation zone 3, and a plurality of linearly distributed branch pipes 11 are fixedly installed at the bottom end of the main air pipe 10 of the flotation machine. The bottom end of the branch pipe 11 extends into the flotation separation zone 3 and is fixedly installed with a flotation head 12. A submersible pump 9 is provided in the flotation separation zone 3, and the water inlet end of the submersible pump 9 is connected to the mixing and stirring zone 2. An inclined plate 13 is provided on the side of the flotation separation zone 3 away from the mixing and stirring zone 2.

[0053] A scraper is fixedly installed on the top of the paint residue separation area 4 , and the scraper includes a scraper conveyor belt 14 , and a plurality of scrapers 15 are fixedly installed on the outer side of the scraper conveyor belt 14 .

[0054] The inner wall of the bottom of the paint residue collection box 16 is inclined, and a separation cylinder 17 is fixedly installed at the bottom of the paint residue collection box 16. The top of the separation cylinder 17 extends into the paint residue collection box 16, and a plurality of filtering holes are opened on the top of the separation cylinder 17.

[0055] A water pump 19 is fixedly installed in the multi-media filter 18, the water inlet end of the water pump 19 is connected to the separation cylinder 17, the water outlet end of the water pump 19 is located in the multi-media filter 18, quartz sand and activated carbon are provided in the multi-media filter 18, a drain pipe 20 is provided on one side of the multi-media filter 18, a valve is provided in the drain pipe 20, one end of a recovery pipe 21 is provided at the bottom of the multi-media filter 18, a water tank 22 is fixedly installed on the other end of the recovery pipe 21, the water tank 22 is fixedly connected to the treatment box 1, and the water tank 22 is connected to the treatment box 1.

[0056] A plurality of feed pipes 23 are disposed in the processing box 1 . A bottom plate 24 is fixedly mounted on the bottom of the processing box 1 . The multi-media filter 18 is fixedly mounted on the top of the multi-media filter 18 .

[0057] Compared with the related art, the paint spraying wastewater treatment process and equipment provided by the present invention have the following beneficial effects:

[0058] The present invention provides a paint spraying wastewater treatment process and equipment, which can quickly and conveniently treat paint residues, the water content of the obtained paint residues is less than 40%, the COD removal rate is 90%, the clean water reuse rate is 85%, and the treatment cycle can be shortened to less than 2 hours.

[0059] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A paint spraying wastewater treatment process, characterized in that: The following steps are involved: S1: Wastewater pretreatment: pH adjustment: Use caustic soda flakes or hydrochloric acid to adjust the wastewater pH to 6.0-6.5; S2: Water purification agent addition: Adsorption reaction: add water purifier at 0.5%-1% of the sewage volume, stir for 20 minutes, and the stirring speed is 300rpm; S3: Addition of additives: Flocculation sedimentation: add additives at 0.1%-0.3% of the sewage volume, stir for 10 minutes at a stirring speed of 50rpm, and let stand for 30 minutes; S4: Paint residue separation: Air flotation separation: paint residue is floated by air flotation machine and collected and processed by scraper; S5: Clean water reuse: Deep filtration: Clean water is filtered through a multi-media filter and then reused.

2. The paint spraying wastewater treatment process according to claim 1, characterized in that: In S1, NaOH or HCl is used to adjust the pH of the sewage to 6.0-6.

5.

3. The paint spraying wastewater treatment process according to claim 1, characterized in that: The multi-media filter is made of quartz sand and activated carbon, with a filtration accuracy of 10 μm and a flow rate of 5 m 3 / h.

4. A paint spraying wastewater treatment equipment, characterized in that: The paint spraying wastewater treatment process as described in 1 comprises a treatment box 1, wherein the treatment box 1 is provided with a mixing and stirring zone 2, an air flotation separation zone 3 and a paint residue separation zone 4, and one side of the treatment box 1 is provided with a paint residue collection box 16 connected to the paint residue separation zone 4, and a multi-media filter 18 is fixedly installed on the paint residue collection box 16.

5. The paint spraying wastewater treatment equipment according to claim 4 is characterized in that: A mounting plate 5 is provided on the top of the mixing and stirring zone 2, a stirring motor 6 is fixedly mounted on the top of the mounting plate 5, a stirring rod 7 is fixedly mounted on the output shaft of the stirring motor 6, and the bottom end of the stirring rod 7 extends into the mixing and stirring zone 2 and is fixedly mounted with a plurality of stirring blades 8.

6. The paint spraying wastewater treatment equipment according to claim 5 is characterized in that: A main air pipe 10 of a flotation machine is provided at the top of the flotation separation zone 3, and a plurality of linearly distributed branch pipes 11 are fixedly installed at the bottom end of the main air pipe 10 of the flotation machine. The bottom end of the branch pipe 11 extends into the flotation separation zone 3 and is fixedly installed with a flotation head 12. A submersible pump 9 is provided in the flotation separation zone 3, and the water inlet end of the submersible pump 9 is connected to the mixing and stirring zone 2. An inclined plate 13 is provided on the side of the flotation separation zone 3 away from the mixing and stirring zone 2.

7. The paint spraying wastewater treatment equipment according to claim 4 is characterized in that: A scraper is fixedly installed on the top of the paint residue separation area 4 , and the scraper includes a scraper conveyor belt 14 , and a plurality of scrapers 15 are fixedly installed on the outer side of the scraper conveyor belt 14 .

8. The paint spraying wastewater treatment equipment according to claim 4 is characterized in that: The inner wall of the bottom of the paint residue collection box 16 is inclined, and a separation cylinder 17 is fixedly installed at the bottom of the paint residue collection box 16. The top of the separation cylinder 17 extends into the paint residue collection box 16, and a plurality of filtering holes are opened on the top of the separation cylinder 17.

9. The paint spraying wastewater treatment equipment according to claim 8, characterized in that: A water pump 19 is fixedly installed in the multi-media filter 18, the water inlet end of the water pump 19 is connected to the separation cylinder 17, the water outlet end of the water pump 19 is located in the multi-media filter 18, quartz sand and activated carbon are provided in the multi-media filter 18, a drain pipe 20 is provided on one side of the multi-media filter 18, a valve is provided in the drain pipe 20, one end of a recovery pipe 21 is provided at the bottom of the multi-media filter 18, a water tank 22 is fixedly installed on the other end of the recovery pipe 21, the water tank 22 is fixedly connected to the treatment box 1, and the water tank 22 is connected to the treatment box 1.

10. The paint spraying wastewater treatment equipment according to claim 4, characterized in that: A plurality of feed pipes 23 are disposed in the processing box 1 . A bottom plate 24 is fixedly mounted on the bottom of the processing box 1 . The multi-media filter 18 is fixedly mounted on the top of the multi-media filter 18 .

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