Comprehensive treatment system for paint spraying wastewater

Abstract

The utility model relates to the technical field of wastewater treatment devices, and discloses a comprehensive treatment system for paint spraying wastewater, which comprises the paint spraying wastewater, a paint spraying wastewater collection tank, an oil separation sedimentation tank, a dissolved air flotation machine, an SBR (sequencing batch reactor) reaction tank, a sludge tank and a plate-and-frame filter press, and gas is injected into the paint spraying wastewater collecting tank. According to the comprehensive treatment system for the paint spraying wastewater, sewage is collected through the paint spraying wastewater collecting tank, meanwhile, the sewage is settled through the oil separation settling tank, demulsification and oil removal treatment is conducted through the dissolved air flotation machine, aeration is conducted on the sewage through the SBR reaction tank, it is ensured that sewage treatment is more sufficient, and meanwhile solid-liquid separation can be conducted on the treated sewage through the filter pressing device; therefore, the paint spraying wastewater is effectively treated, the treatment investment cost is saved, and up-to-standard discharge is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment device technical field, concretely is a kind of comprehensive treatment system of paint spraying wastewater. BACKGROUND

[0002] Paint spraying wastewater is mainly derived from wet paint spraying chamber water washing paint spraying chamber operating area air, paint and organic solvent in air are transferred to water to form paint spraying wastewater, wastewater contains a large number of paint particles, and its water quality is determined by the coating (mainly nitro paint, amino paint, alkyd paint and epoxy paint), solvent (such as ethanol, acetone, ester, benzene) and additive. There are two forms of wastewater: one is that a part of circulating water is discharged as wastewater, and a sufficient amount of fresh water is supplemented; the second is that the water is completely renewed after a certain cycle.

[0003] And usually in the process of treating paint spraying wastewater, the existing pretreatment equipment generally uses single device to filter, neutralize or aerate sewage, which leads to insufficient wastewater treatment due to the single treatment device, so that the pretreatment device has low treatment efficiency, and the pretreatment effluent has high SS index. And the conventional treatment device needs to transport the treated wastewater to another area after treating the sewage to different flow, so that the site required in the process of treating sewage is increased, causing the treatment device to occupy a large area, affecting the subsequent treatment effect and discharge index. Therefore, we provide a comprehensive treatment system for paint spraying wastewater. UTILITY MODEL CONTENT

[0004] In view of the deficiencies of the existing comprehensive treatment system for paint spraying wastewater, the utility model provides a comprehensive treatment system for paint spraying wastewater, which has the advantages of ensuring that the liquid formed after wastewater treatment can be directly discharged, and the solid impurities generated can be treated after transportation, forming a complete treatment method, ensuring the efficiency and sufficiency of wastewater treatment, and solving the problems raised in the above background technology.

[0005] The utility model provides the following technical scheme: A kind of comprehensive treatment system of paint spraying wastewater, including paint spraying wastewater, paint spraying wastewater collection tank, oil separation sedimentation tank, dissolved air flotation machine, SBR reaction tank, sludge tank and plate-and-frame filter press, the paint spraying wastewater is injected into the inside of paint spraying wastewater collection tank by material conveying pipeline, the inside of paint spraying wastewater collection tank is injected with gas, gas is injected into the inside of paint spraying wastewater collection tank by a group of first air pipe simultaneously using the gas generated by first air blower, the paint spraying wastewater collection tank is transmitted power by catch basin booster pump, and sewage is simultaneously transmitted to the inside of oil separation sedimentation tank by first sewage lifting pipeline, sludge is generated after sludge deposition in the inside of oil separation sedimentation tank, liquid and oil, liquid is transported to the inside of dissolved air flotation machine by sewage pipeline, the dissolved air flotation machine is transmitted to the inside of SBR reaction tank by intermediate booster pump and second sewage lifting pipeline, sludge discharge pipeline is installed in the lower portion of oil separation sedimentation tank, dissolved air flotation machine and SBR reaction tank, the sludge discharge pipeline extends to the inside of sludge tank, the sludge in the inside of sludge tank is transmitted to the inside of plate-and-frame filter press by sludge feeding pump and sludge feeding pipe.

[0006] Preferably, the dissolved air flotation machine and the inside of the sludge tank are respectively provided with a dosing device and a lime dosing port, the lime dosing port extends to the inside of the sludge tank through a dosing pipeline, and the dosing device comprises a demulsifier dosing device, an alkali dosing device, and a hardening agent dosing device.

[0007] Preferably, the end of the other group of first air pipes is provided with a microporous aerator, the microporous aerator is installed at the bottom end inside the SBR reaction tank, and the SBR reaction tank is provided with a drainage pipeline.

[0008] Preferably, a second air blower is installed on one side of the sludge tank through a second air pipe, and the end of the second air pipe extends to the lower end inside the sludge tank.

[0009] Preferably, the inside of the paint spraying wastewater collection tank comprises a wastewater collection tank and an oil collection tank, and the waste oil discharge pipeline extends to the inside of the oil collection tank.

[0010] Preferably, the plate-and-frame filter press generates filter liquid and sludge after filtering the sludge, the plate-and-frame filter press is externally connected to a filter liquid output pipe and a filter sludge conveying pipe, the sludge is transmitted to the inside of the sludge transportation device through the filter sludge conveying pipe, and the filter liquid is carried back to the inside of the paint spraying wastewater collection tank through the filter liquid output pipe.

[0011] Preferably, the oil separation sedimentation tank drives sewage deposition, and the oil generated by deposition is carried back to the inside of the paint spraying wastewater collection tank through the waste oil discharge pipeline.

[0012] Compared with the existing comprehensive treatment system of paint spraying wastewater, the utility model has the following beneficial effects:

[0013] 1. The paint spraying wastewater comprehensive treatment system, through the paint spraying wastewater collecting pool, the sewage is collected, and meanwhile the oil separation sedimentation tank is used for sedimentation, the dissolved air flotation machine is used for demulsification and oil removal treatment, the SBR reaction tank is used for aeration, so that the sewage treatment is more sufficient, and the pressure filtration device is used for solid-liquid separation of the treated sewage, so that the efficiency of impurity concentration treatment is improved, the paint spraying wastewater is effectively treated, the treatment investment cost is saved, and the discharge standard is realized.

[0014] 2. The paint spraying wastewater comprehensive treatment system, through the paint spraying wastewater collecting pool, the oil separation sedimentation tank, the dissolved air flotation machine, the SBR reaction tank, the sludge tank and the plate and frame filter press, the paint spraying wastewater is treated in sequence, solid impurities and liquid that can be directly discharged are generated after treatment of the wastewater, the sufficiency of treatment is ensured, the liquid generated after pressure filtration of the equipment is backflowed to the inside of the paint spraying wastewater collecting pool, the efficiency and comprehensiveness of treatment are further improved after treatment of the liquid, the phenomenon of insufficient treatment is effectively avoided, and the whole realizes a comprehensive whole, so that the operation such as transfer is not needed in the treatment process, and the operation cost and space are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the comprehensive treatment system of the utility model;

[0016] Figure 2 It is a partial enlarged schematic view of the dosing device of the utility model.

[0017] In the drawing: 1, paint spraying wastewater collecting pool; 2, paint spraying wastewater; 3, material conveying pipeline; 4, first air blower; 5, first air pipe; 6, collecting pool lifting pump; 7, first sewage lifting pipeline; 8, oil separation sedimentation tank; 9, waste oil discharge pipeline; 10, sewage pipeline; 11, dissolved air flotation machine; 12, dosing device; 121, demulsifier dosing device; 122, alkali dosing device; 123, hardening agent dosing device; 13, intermediate lifting pump; 14, second sewage lifting pipeline; 15, SBR reaction tank; 16, drainage pipeline; 17, sludge discharge pipeline; 18, sludge tank; 19, second air blower; 20, second air pipe; 21, lime dosing port; 22, dosing pipeline; 23, sludge feeding pump; 24, sludge feeding pipe; 25, plate and frame filter press; 26, pressure filtration filtrate output pipe; 27, pressure filtration sludge conveying pipe; 28, sludge external transport device; 29, microporous aerator. DETAILED DESCRIPTION

[0018] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0019] Please refer to Figure 1 and Figure 2 , a paint spraying wastewater comprehensive treatment system, comprising paint spraying wastewater 2, paint spraying wastewater collection tank 1, oil separation sedimentation tank 8, dissolved air flotation machine 11, SBR reaction tank 15, sludge tank 18 and plate and frame filter press 25, paint spraying wastewater 2 is injected into the inside of paint spraying wastewater collection tank 1 through feed pipe 3, paint spraying wastewater 2 drives paint wastewater to be transmitted, paint spraying wastewater collection tank 1 is injected into the inside of paint spraying wastewater collection tank 1 through the gas generated by first air blower 4, and the gas is injected into the inside of paint spraying wastewater collection tank 1 through a group of first air pipes 5 at the same time, first air pipes 5 drive the gas to be transmitted to the inside of paint spraying wastewater collection tank 1, and the wastewater in paint spraying wastewater collection tank 1 is stirred, paint spraying wastewater collection tank 1 transmits power through catch basin booster pump 6, and at the same time, drives the wastewater to be transmitted to the inside of oil separation sedimentation tank 8 through first wastewater lifting pipe 7, oil separation sedimentation tank 8 drives the wastewater to be deposited, and after the sludge in the inside of oil separation sedimentation tank 8 is deposited, sludge, liquid and oil are generated, the liquid is transported to the inside of dissolved air flotation machine 11 through wastewater pipe 10, dissolved air flotation machine 11 treats the wastewater, and at the same time, realizes oil stain separation, dissolved air flotation machine 11 drives the wastewater to be transmitted to the inside of SBR reaction tank 15 through intermediate booster pump 13 and second wastewater lifting pipe 14, SBR reaction tank 15 drives the wastewater to be aerated again, and sludge pipes 17 are installed at the lower parts of oil separation sedimentation tank 8, dissolved air flotation machine 11 and SBR reaction tank 15, sludge pipes 17 extend to the inside of sludge tank 18, the sludge in the inside of sludge tank 18 is transmitted to the inside of plate and frame filter press 25 through sludge feeding pump 23 and sludge feeding pipe 24, plate and frame filter press 25 performs pressure filtration treatment on the sludge, and the solid impurities transmitted by pressure filtration are transported, and the liquid is returned to the inside of paint spraying wastewater collection tank 1 to be treated again.

[0020] Please refer to Figure 2 , and lime feeding port 21 is extended to the inside of sludge tank 18 through dosing pipe 22, dosing device 12 comprises demulsifier dosing device 121, alkali dosing device 122 and hardening aid dosing device 123, dosing device 12 and lime feeding port 21 are respectively installed in the inside of dissolved air flotation machine 11 and sludge tank 18, that is, in the process of treating the sludge and wastewater, the impurities in the liquid, wastewater and sludge are neutralized, and the treatment efficiency is ensured.

[0021] Referring to Figure 1 , the end of another group of first air pipes 5 is provided with a microporous aerator 29, which is installed at the bottom end inside the SBR reaction tank 15, and the inside of the SBR reaction tank 15 is provided with a drainage pipeline 16. Two groups of first air pipes 5 are installed outside the first air blower 4, one group of first air pipes 5 extends to the inside of the paint spraying wastewater collection tank 1, that is, the aeration device can preliminarily treat the sewage inside the paint spraying wastewater collection tank 1, and the subsequently treated wastewater is transported to the inside of the SBR reaction tank 15. The microporous aerator 29 is extended to the inside of the SBR reaction tank 15 through the first air pipe 5, which ensures the cleanliness of the liquid discharged through the drainage pipeline 16 and avoids pollution of the environment by the discharged wastewater.

[0022] Referring to Figure 1 , the second air blower 19 is installed on one side of the sludge tank 18 through the second air pipe 20, and the end of the second air pipe 20 extends to the lower end inside the sludge tank 18. By installing the second air blower 19 on one side of the sludge tank 18, the high-pressure gas carried by the second air pipe 20 can be used to aerate the sludge in the sludge tank 18 when the second air blower 19 is started, thereby ensuring that the medicament discharged from the lime dosing port 21 is fully mixed with the sludge.

[0023] Referring to Figure 1 , the inside of the paint spraying wastewater collection tank 1 comprises a wastewater collection tank and an oil collection tank, and the sludge discharge pipeline 9 extends to the inside of the oil collection tank. By providing the wastewater collection tank and the oil collection tank in the paint spraying wastewater collection tank 1, the wastewater collection tank can collect and treat wastewater, and the oil collection tank can collect and treat recovered oil.

[0024] Referring to Figure 1 , the plate-and-frame filter press 25 generates filter press liquid and sludge after filtering the sludge, and the outside of the plate-and-frame filter press 25 is connected with a filter press liquid output pipe 26 and a filter press sludge conveying pipe 27. The sludge is transported to the inside of the sludge external transport device 28 through the filter press sludge conveying pipe 27, and the filter press liquid is carried by the filter press liquid output pipe 26 to flow back to the inside of the paint spraying wastewater collection tank 1. By transporting the treated sludge to the inside of the plate-and-frame filter press 25, the plate-and-frame filter press 25 is used to filter the sludge, and the sludge cake after filtering is transported to the inside of the sludge external transport device 28 through the filter press sludge conveying pipe 27. The sludge external transport device 28 can treat the generated sludge cake, and the filter press generates wastewater, and the wastewater contains impurities. Therefore, the filter press liquid output pipe 26 is used to carry the generated wastewater back to the inside of the paint spraying wastewater collection tank 1, and the paint spraying wastewater collection tank 1 is used to treat the wastewater again, thereby ensuring the efficiency of wastewater treatment.

[0025] Referring to Figure 1The oil liquid generated by the sedimentation is returned to the inside of the paint spraying wastewater collecting tank 1 through the oil discharge pipeline 9, and after the sedimentation of the wastewater is driven by the oil separation tank 8, the oil discharge pipeline 9 is installed in the inside of the oil separation tank 8, the oil liquid floating on the upper layer is returned to the inside of the paint spraying wastewater collecting tank 1 through the oil discharge pipeline 9, and the influence of the oil liquid on the treatment of the wastewater is effectively avoided.

[0026] Working principle: in use, the paint spraying wastewater is discharged into the paint spraying wastewater collecting tank 1, the aeration device in the paint spraying wastewater collecting tank 1 is driven by the first air pipe 5 to mix the wastewater uniformly by the air supply of the first air blower 4; the wastewater is treated by the oil separation tank 8 through the collecting tank lifting pump 6, the oil is stored in the inside of the oil collecting tank in the paint spraying wastewater collecting tank 1 by the oil discharge pipeline 9, and the oil sludge is settled at the bottom and discharged to the dissolved air flotation machine 11 through the wastewater pipeline 10 for treatment; the water outlet of the wastewater pipeline 10 flows into the dissolved air flotation machine 11, the oil pollution in the wastewater is separated by adding the reagent through the reagent adding device 12, the separation is carried out through the flotation of the air flotation machine, and the dregs and sludge are discharged into the sludge tank for treatment; the water outlet of the air flotation machine is temporarily stored in the intermediate tank and then lifted to the SBR reaction tank 15 through the lifting pump, the COD and other pollutants in the water are removed through intermittent aeration, so that the treated wastewater meets the discharge standard; the sludge stored in the sludge tank is treated by adding lime and using the micro-porous aerator 29, and is transported to the plate and frame filter press 25 through the sludge feeding pump, the sludge is treated by the water pressure filtration, the sludge is regularly cleaned and transported, and the filtrate is returned to the paint spraying wastewater collecting tank 1.

[0027] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A comprehensive treatment system for paint spraying wastewater, comprising paint spraying wastewater (2), paint spraying wastewater collection tank (1), oil-water separation sedimentation tank (8), dissolved air flotation unit (11), SBR reactor (15), sludge tank (18), and plate and frame filter press (25), characterized in that: The paint spraying wastewater (2) is injected into the paint spraying wastewater collection tank (1) through the conveying pipe (3). Gas is injected into the paint spraying wastewater collection tank (1). The gas generated by the first blower (4) is simultaneously injected into the paint spraying wastewater collection tank (1) through a set of first air ducts (5). The paint spraying wastewater collection tank (1) is powered by the water collection tank lift pump (6), which simultaneously drives the sewage to be transported to the oil separation sedimentation tank (8) through the first sewage lift pipe (7). After the sludge settles in the oil separation sedimentation tank (8), sludge, liquid and oil are generated. The oil separation sedimentation tank (8) is equipped with an oil discharge pipe. The liquid is transported through the sewage pipe (10) to the interior of the dissolved air flotation machine (11). The dissolved air flotation machine (11) drives the sewage to the interior of the SBR reactor (15) through the intermediate lift pump (13) and the second sewage lift pipe (14). The lower part of the oil-water separation sedimentation tank (8), the dissolved air flotation machine (11) and the SBR reactor (15) are all equipped with sludge discharge pipes (17). The sludge discharge pipes (17) extend to the interior of the sludge tank (18). The sludge inside the sludge tank (18) is transported to the interior of the plate and frame filter press (25) through the sludge feed pump (23) and the sludge feed pipe (24).

2. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: The dissolved air flotation machine (11) and the sludge tank (18) are respectively equipped with a dosing device (12) and a lime dosing port (21). The lime dosing port (21) extends into the sludge tank (18) through a dosing pipe (22). The dosing device (12) includes a demulsifier dosing device (121), an alkali dosing device (122), and a hardening agent dosing device (123).

3. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: Another set of the first air duct (5) is equipped with a microporous aerator (29) at the end. The microporous aerator (29) is installed at the bottom of the SBR reactor (15). The SBR reactor (15) is equipped with a drainage pipe (16).

4. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: A second blower (19) is installed on one side of the sludge tank (18) via a second air duct (20), the end of which extends to the lower end of the interior of the sludge tank (18).

5. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: The interior of the paint spraying wastewater collection tank (1) includes a wastewater collection tank and an oil collection tank, and the sludge discharge pipe (9) extends into the interior of the oil collection tank.

6. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: The plate and frame filter press (25) filters the sludge to generate filter liquid and sludge. The plate and frame filter press (25) is externally connected to a filter liquid output pipe (26) and a filter sludge conveying pipe (27). The sludge is transported to the inside of the sludge transport device (28) through the filter sludge conveying pipe (27). The filter liquid is carried back to the inside of the paint wastewater collection tank (1) through the filter liquid output pipe (26).

7. The comprehensive treatment system for paint spraying wastewater according to claim 1, characterized in that: The oil-water separation sedimentation tank (8) causes the sewage to settle, and the oil produced by the sedimentation flows back to the interior of the paint spraying wastewater collection tank (1) through the sludge discharge pipe (9).

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