CN107265787A - Vehicle coating wastewater handling process and Wastewater Disposal Line of Automobile Coating - Google Patents

Abstract

The invention discloses an automobile painting wastewater treatment process and an automobile painting wastewater treatment system, and relates to the field of industrial wastewater treatment. The invention provides a treatment process for automobile painting wastewater, comprising: Pretreatment step, coagulation reaction step, precipitation removal step, hydrolysis acidification step and molecular decomposition step. The invention also provides an automobile painting wastewater treatment system using the automobile painting wastewater treatment process. The automobile painting wastewater treatment process and the automobile painting wastewater treatment system provided by the invention have simple structure and good sewage purification effect. At the same time, it has the characteristics of small footprint, low investment and operating costs, convenient operation and management, and has good social and economic benefits.

Description

Automobile painting wastewater treatment process and automobile painting wastewater treatment system

technical field

The invention relates to the field of industrial wastewater treatment, in particular to a process for treating wastewater from automobile painting and a system for treating wastewater from automobile painting.

Background technique

There are many types of pollutants in the coating wastewater, the discharge volume is large, and there is no fixed discharge law, and it contains heavy metal ions, etc., which are the focus and difficulty of pollution control. At present, more than 90% of the outer surfaces of automobiles and motorcycles need to be painted. The painting of automobile body and parts is one of the links in the production of automobile industry that produces the most types of pollutants and the largest amount of wastewater discharge.

The existing automobile painting wastewater treatment process is relatively complicated, and the structure of the automobile painting wastewater treatment system is relatively complicated, and it is not convenient for the treatment of automobile painting wastewater. At the same time, the existing automobile painting wastewater treatment process requires a large area, and the investment and operation costs are relatively high.

Contents of the invention

The object of the present invention is to provide a treatment process for automobile painting wastewater, which has simple steps and good sewage purification effect. At the same time, it has good social and economic benefits.

Another object of the present invention is to provide an automobile painting wastewater treatment system, which has a simple structure and a good sewage purification effect. At the same time, it has the characteristics of small footprint, low investment and operating costs, convenient operation and management, and has good social and economic benefits.

The invention provides a technical solution:

The invention relates to an automobile painting wastewater treatment process, which is used for treating the automobile painting wastewater. Automotive painting wastewater includes degreasing wastewater, phosphating and passivation wastewater, electrophoresis wastewater and painting wastewater. The automotive painting wastewater treatment process includes: pretreatment steps: degreasing the degreasing wastewater, precipitating the phosphating and passivating wastewater, precipitating the electrophoresis wastewater and pretreating the painting wastewater, and degreasing the treated degreasing wastewater Wastewater, phosphating and passivation wastewater, electrophoresis wastewater and painting wastewater are introduced into the coagulation reaction tank to form wastewater to be treated. Coagulation reaction step: coagulation reaction is performed on the wastewater to be treated. Sediment removal step: import the untreated wastewater after the coagulation reaction into the inclined tube sedimentation tank, settle the untreated wastewater entering the inclined tube sedimentation tank, and remove the sludge containing sediment from the inclined tube sedimentation tank. Hydrolysis and acidification step: import the wastewater to be treated after the precipitation removal step into a hydrolysis tank, and perform hydrolysis and acidification on the wastewater to be treated in the hydrolysis tank, so as to convert high-molecular organic matter in the wastewater to be treated into small-molecular organic matter. Molecular decomposition step: the waste water to be treated after the hydrolysis and acidification step is introduced into the biofilter, and small molecular organic matter is decomposed.

Further, the above-mentioned pretreatment step includes degreasing the degreasing waste water by using a belt oil scoop machine.

Further, the above-mentioned degreasing wastewater treatment step also includes further removing grease in the degreasing wastewater by ultrafiltration equipment.

Further, the above coagulation reaction step includes putting alkalized substances into the coagulation reaction tank to adjust the pH value in the coagulation reaction tank to 11.0-12.0.

Further, the above automobile painting wastewater treatment process also includes a sludge concentration step, and the sludge concentration step includes introducing the sludge in the inclined tube sedimentation tank into a sludge concentration tank, and performing concentration treatment.

Further, the above sludge thickening step also includes introducing the thickened sludge into a coagulation reaction tank through a sedimentation circulation pump.

An automobile painting wastewater treatment system adopts an automobile painting wastewater treatment process. Automotive painting wastewater includes degreasing wastewater, phosphating and passivation wastewater, electrophoresis wastewater and painting wastewater. The automotive painting wastewater treatment process includes: pretreatment steps: degreasing the degreasing wastewater, precipitating the phosphating and passivating wastewater, precipitating the electrophoresis wastewater and pretreating the painting wastewater, and degreasing the treated degreasing wastewater Wastewater, phosphating and passivation wastewater, electrophoresis wastewater and painting wastewater are introduced into the coagulation reaction tank to form wastewater to be treated. Coagulation reaction step: coagulation reaction is performed on the wastewater to be treated. Sediment removal step: import the untreated wastewater after the coagulation reaction into the inclined tube sedimentation tank, settle the untreated wastewater entering the inclined tube sedimentation tank, and remove the sludge containing sediment from the inclined tube sedimentation tank. Hydrolysis and acidification step: import the wastewater to be treated after the precipitation removal step into a hydrolysis tank, and perform hydrolysis and acidification on the wastewater to be treated in the hydrolysis tank, so as to convert high-molecular organic matter in the wastewater to be treated into small-molecular organic matter. Molecular decomposition step: the waste water to be treated after the hydrolysis and acidification step is introduced into the biofilter, and small molecular organic matter is decomposed. The automobile painting wastewater treatment system includes a pretreatment system, a coagulation reaction tank, an inclined tube sedimentation tank, a hydrolysis tank and a biological filter. The pretreatment system is connected to the coagulation reaction tank, and the coagulation reaction tank is connected to the inclined tube sedimentation tank. The pipe sedimentation tank is connected with the hydrolysis tank, and the hydrolysis tank is connected with the biofilter.

Further, the above pretreatment system includes degreasing wastewater treatment equipment, phosphating and passivation wastewater treatment equipment, electrophoresis wastewater treatment equipment and spray painting wastewater treatment equipment, degreasing wastewater treatment equipment, phosphating and passivation wastewater treatment equipment, electrophoresis wastewater treatment equipment and spray paint The waste water treatment equipment is connected with the coagulation reaction tank.

Further, the above biofilter includes a filter body, a sewage inlet pipe, a water outlet pipe, a fan, a detection component, a stirring component, an air valve component and a heating component. The filter body includes a bottom wall, a side wall and a top wall, one end of the side wall is fixedly connected with the bottom wall, and the other end of the side wall is rotatably connected with the top wall. The sewage inlet pipe communicates with the inner cavity of the filter tank body to lead the sewage into the filter tank body. The detection component is installed on the side wall. The fan is installed on the top wall. The stirring assembly includes a slide rail, a stirring piece and a driving piece. The slide rail is installed on the side wall, and the extension direction of the slide rail is consistent with the extending direction of the side wall. The driving piece is connected with the stirring piece, and the driving piece can drive the stirring piece to slide along the slide rail. . The heating assembly communicates with the inner cavity of the filter body through the air valve assembly. The water outlet pipe communicates with the inner cavity of the filter body to lead the treated sewage out of the filter body.

Further, the above-mentioned automobile painting wastewater treatment system also includes a sludge concentration tank, and both the inclined tube sedimentation tank and the hydrolysis tank are connected to the sludge concentration tank.

Compared with the prior art, the beneficial effects of the automobile painting wastewater treatment process and the automobile painting wastewater treatment system provided by the invention are:

The pretreatment system is used for degreasing treatment of degreasing wastewater, precipitation treatment of phosphating and passivation wastewater, precipitation treatment of electrophoresis wastewater and pretreatment of spray painting wastewater, and the treated degreasing wastewater, phosphorus Passivation wastewater, electrophoresis wastewater and painting wastewater are introduced into the coagulation reaction tank to form wastewater to be treated. The coagulation reaction tank is used for coagulation reaction of the wastewater to be treated. The inclined tube sedimentation tank is used to introduce the untreated wastewater after the coagulation reaction into the inclined tube sedimentation tank, settle the untreated wastewater entering the inclined tube sedimentation tank, and remove the sludge containing sediment from the inclined tube sedimentation tank. The hydrolysis tank is used to introduce the wastewater to be treated after the precipitation removal step into the hydrolysis tank, and perform hydrolysis and acidification of the wastewater to be treated in the hydrolysis tank, so as to convert the high molecular organic matter in the wastewater to be treated into small molecular organic matter. The biofilter is used to introduce the waste water to be treated after the hydrolysis and acidification step into the biofilter, and decompose small molecular organic matter. The automobile painting wastewater treatment process and the automobile painting wastewater treatment system provided by the invention have simple structure and good sewage purification effect. At the same time, it has the characteristics of small footprint, low investment and operating costs, convenient operation and management, and has good social and economic benefits.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following will briefly introduce the drawings used in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the invention and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the schematic structural view of the automobile painting wastewater treatment system provided by the first embodiment of the present invention;

Fig. 2 is the structural representation of the biofilter for sewage treatment provided by the first embodiment of the present invention;

Fig. 3 is a schematic structural view of the stirring member provided by the first embodiment of the present invention;

4 is a schematic structural view of the air valve assembly provided by the first embodiment of the present invention;

Fig. 5 is a schematic cross-sectional structure diagram of the heating assembly provided by the first embodiment of the present invention.

Icons: 10-automobile painting wastewater treatment system; 100-biological filter; 110-filter body; 111-bottom wall; 112-side wall; 113-top wall; 120-sewage inlet pipe; 130-water outlet pipe; 140-fan; 150-detection component; 151-thermometer; 152-barometer; 160-stirring component; 161-sliding rail; 162-stirring piece; 1621-threaded hole; - air valve assembly; 171 - the first air guide tube; 172 - the second air guide tube; 173 - the third air guide tube; 174 - the first air guide valve; 175 - the second air guide valve; 176 - the third air guide valve; 177-tee pipe; 1771-first connecting part; 1772-second connecting part; 1773-third connecting part; 180-heating assembly; 181-heating cavity; 182-heating element; Tube sedimentation tank; 400-coagulation reaction tank; 500-pretreatment system.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right" etc. are based on those shown in the accompanying drawings. Orientation or positional relationship, or the orientation or positional relationship that is usually placed when the product of the invention is used, or the orientation or positional relationship that is commonly understood by those skilled in the art, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise specified and limited, terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection or a Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

first embodiment

Please refer to FIG. 1 , this embodiment provides an automobile painting wastewater treatment system 10 , which has a simple structure and good sewage purification effect. At the same time, it has the characteristics of small footprint, low investment and operating costs, convenient operation and management, and has good social and economic benefits.

The automobile painting wastewater treatment system 10 provided in this embodiment includes a pretreatment system 500 , a coagulation reaction tank 400 , an inclined tube sedimentation tank 300 , a hydrolysis tank 200 and a biological filter tank 100 .

The pretreatment system 500 provided in this embodiment is connected to the coagulation reaction tank 400, the coagulation reaction tank 400 is connected to the inclined tube sedimentation tank 300, the inclined tube sedimentation tank 300 is connected to the hydrolysis tank 200, and the hydrolysis tank 200 is connected to the biofilter 100 .

It can be understood that the coagulation reaction tank 400 is used for coagulation reaction. The inclined tube sedimentation tank 300 is used to basically remove the sediment in the automobile painting wastewater, and make the turbidity of the effluent meet the effluent requirements. The hydrolysis tank 200 is used to hydrolyze and acidify the organic matter in the wastewater. The biofilter 100 is used to completely decompose small molecular organic matter.

In this embodiment, the automobile painting wastewater includes degreasing wastewater, phosphating and passivating wastewater, electrophoresis wastewater and painting wastewater. The pretreatment system 500 is used to pretreat degreasing wastewater, phosphating and passivation wastewater, electrophoresis wastewater and painting wastewater, and import the treated wastewater into the coagulation reaction tank 400 .

In this embodiment, the pretreatment system 500 includes degreasing wastewater treatment equipment, phosphating and passivation wastewater treatment equipment, electrophoresis wastewater treatment equipment and spray paint wastewater treatment equipment, degreasing wastewater treatment equipment, phosphating and passivation wastewater treatment equipment, electrophoresis wastewater treatment equipment The equipment and the spray paint wastewater treatment equipment are all connected to the coagulation reaction tank 400 .

In this embodiment, the degreasing waste water is subjected to degreasing treatment by a belt oil skimmer (not shown), and the grease in the degreasing waste water is further removed by an ultrafiltration device (not shown).

Please refer to FIG. 2 , the biofilter 100 provided in this embodiment includes a filter body 110 , a sewage inlet pipe 120 , a water outlet pipe 130 , a fan 140 , a detection unit 150 , an agitation unit 160 , an air valve unit 170 and a heating unit 180 .

It can be understood that the sewage to be treated enters the inner cavity of the filter body 110 through the sewage inlet pipe 120 and continuously accumulates in the inner cavity of the filter body 110 . The detection component 150 detects the sewage contained in the inner cavity of the filter body 110 and the state of the inner cavity of the filter body 110 , and the user can make corresponding judgments and operations according to the detection results of the detection component 150 . Driven by the driving member 163 , the stirring member 162 slides along the slide rail 161 to stir the sewage contained in the inner cavity of the filter body 110 , thereby promoting the reaction in the biofilter 100 . The heating assembly 180 introduces the heated gas into the inner cavity of the filter body 110 through the gas valve assembly 170 , thereby adjusting the temperature in the inner cavity of the filter body 110 and further controlling the chemical reaction in the filter body 110 . The treated sewage flows out from the inner cavity of the filter body 110 through the water outlet pipe 130 and enters the next link of sewage treatment.

The filter body 110 includes a bottom wall 111 , a side wall 112 and a top wall 113 . One end of the side wall 112 is fixedly connected to the bottom wall 111 , and the other end of the side wall 112 is rotatably connected to the top wall 113 .

In this embodiment, the shape enclosed by the side wall 112 is a cylinder. That is to say, the filter body 110 provided in this embodiment is cylindrical. Of course, it is not limited thereto. In other embodiments of the present invention, the side wall 112 may also be surrounded by other shapes, such as a rectangular parallelepiped.

It can be understood that the rotatable connection between the side wall 112 and the top wall 113 can make the top wall 113 open more conveniently, so that it is convenient to inject medicine into the filter body 110, and it is also convenient for the user to adjust the filter during use. The inner cavity of the body 110 is observed.

In this embodiment, the rotational connection between the top wall 113 and the side wall 112 is realized by hinge connection. Of course, it is not limited thereto. In other embodiments of the present invention, the top wall 113 and the side wall 112 may also be rotatably connected by other connection methods, such as bearings.

The sewage inlet pipe 120 communicates with the inner cavity of the filter tank body 110 to introduce sewage into the filter tank body 110 . The water outlet pipe 130 communicates with the inner cavity of the filter body 110 to lead the treated sewage out of the filter body 110 .

In this embodiment, the sewage inlet pipe 120 is located at the upper end of the filter body 110 , and the water outlet pipe 130 is located at the lower end of the filter body 110 . The water outlet pipe 130 is located at the lower end of the filter body 110 so that sewage can leave the filter body 110 under the action of gravity, thereby reducing the use of water pumps and other components, thereby saving energy and cost.

The detection component 150 is installed on the side wall 112 and is used for detecting the state of the sewage and the inner cavity of the filter body 110 .

In this embodiment, the detection component 150 includes a thermometer 151 for detecting a temperature value and a barometer 152 for detecting an air pressure value, and both the thermometer 151 and the barometer 152 are installed on the side wall 112 . Of course, it is not limited thereto. In other embodiments of the present invention, the detection component 150 may also include other detection devices, such as a hygrometer.

The fan 140 is installed on the top wall 113, and is used to deliver oxygen to the inner cavity of the filter body 110 while blowing air to the filter body 110, so that the oxygen content in the filter body 110 can be indirectly controlled by controlling the fan 140 , and further control the reaction in the filter body 110 .

The stirring assembly 160 includes a slide rail 161, a stirring member 162 and a driving member 163, the sliding rail 161 is installed on the side wall 112, and the extending direction of the sliding rail 161 is consistent with the extending direction of the side wall 112, and the driving member 163 is connected with the stirring member 162, The driving member 163 can drive the stirring member 162 to slide along the slide rail 161 .

In this embodiment, the slide rail 161 is a lead screw. Of course, it is not limited thereto, and in other embodiments of the present invention, the sliding rail 161 may also have other structures, which will not be repeated here.

In this embodiment, in order to make the agitator 162 move more smoothly, there are at least two slide rails 161 , and the slide rails 161 are evenly arranged around the side wall 112 .

Please refer to FIG. 3 , in this embodiment, the stirring member 162 is provided with a threaded hole 1621 cooperating with the slide rail 161 and a plurality of stirring through holes 1622 , and the plurality of stirring through holes 1622 are evenly spaced.

It can be understood that the cooperation between the threaded hole 1621 and the lead screw can drive the stirring member 162 to move linearly along the lead screw when the lead screw rotates.

In this embodiment, the number of threaded holes 1621 is two, that is, the number of slide rails 161 provided in this embodiment is also two. Of course, it is not limited thereto. In other embodiments of the present invention, the number of threaded holes 1621 may also be other numbers, such as three.

In this embodiment, the heating assembly 180 communicates with the inner cavity of the filter body 110 through the air valve assembly 170 .

Please refer to FIG. 2 and FIG. 4 in conjunction. In this embodiment, the air valve assembly 170 includes a first air guide tube 171, a second air guide tube 172, a third air guide tube 173, a first air guide valve 174, a second air guide valve 175, the third air guide valve 176 and the three-way pipe 177. The first air guiding valve 174 is installed on the first air guiding tube 171 to control the opening or closing of the first air guiding tube 171 . The second air guiding valve 175 is installed on the second air guiding tube 172 to control the conduction or closing of the second air guiding tube 172 . The third air guiding valve 176 is installed on the third air guiding tube 173 to control the conduction or closing of the third air guiding tube 173 . One end of the first air duct 171 is connected to the heating assembly 180, one end of the second air duct 172 is connected to the side wall 112, the end of the first air duct 171 is away from the heating assembly 180, and the end of the second air duct 172 is away from the side wall 112. The third air duct 173 communicates with it.

In this embodiment, the first airway tube 171 , the second airway tube 172 and the third airway tube 173 are connected through a three-way tube 177 .

The tee tube 177 provided in this embodiment includes a first connecting portion 1771, a second connecting portion 1772 and a third connecting portion 1773, the first connecting portion 1771 is connected to the first air duct 171, the second connecting portion 1772 is connected to the second air duct The air tube 172 is connected, and the third connection part 1773 is connected with the third air tube 173 .

Referring to FIG. 5 , in this embodiment, the heating assembly 180 includes a heating chamber 181 and a heating element 182 , the heating element 182 is located in the heating chamber 181 , and the air valve assembly 170 communicates with the heating chamber 181 .

There are multiple heating elements 182 , and the plurality of heating elements 182 are evenly spaced and connected to the heating chamber 181 .

It can be understood that, in order to timely control the air pressure and temperature in the heating chamber 181, in other embodiments of the present invention, the heating assembly 180 also includes a temperature detection element (not shown in the figure) and an air pressure detection element (not shown in the figure), In order to detect the air pressure and temperature in the heating chamber 181 in real time.

In other embodiments of the present invention, the automobile painting wastewater treatment system 10 further includes a sludge thickening tank (not shown in the figure), and both the inclined tube sedimentation tank 300 and the hydrolysis tank 200 are connected to the sludge thickening tank. It can be understood that the function of the sludge thickening tank is to introduce the sludge sediment in the inclined tube sedimentation tank 300 and the hydrolysis tank 200 into the sludge thickening tank for cleaning, so as to keep the inclined tube sedimentation tank 300 and the hydrolysis tank 200 better purification effect.

The beneficial effects of the automobile painting wastewater treatment system 10 provided in this embodiment are: the pretreatment system 500 is used to degrease the coating wastewater, degrease the degreasing wastewater, precipitate the phosphating and passivation wastewater, and precipitate the electrophoresis wastewater. Treating and pre-treating the painting wastewater, and introducing the treated degreasing wastewater, phosphating and passivating wastewater, electrophoresis wastewater and painting wastewater into the coagulation reaction tank 400 to form wastewater to be treated. The coagulation reaction tank 400 is used for coagulation reaction of the wastewater to be treated. The inclined tube sedimentation tank 300 is used to introduce the untreated wastewater after the coagulation reaction into the inclined tube sedimentation tank 300, settle the untreated wastewater entering the inclined tube sedimentation tank 300, and transfer the sludge containing sediment from the inclined tube sedimentation tank 300 removed. The hydrolysis tank 200 is used to introduce the wastewater to be treated after the precipitation removal step into the hydrolysis tank 200, and perform hydrolysis and acidification on the wastewater to be treated in the hydrolysis tank 200, so as to convert the high molecular organic matter in the wastewater to small molecular organic matter. The biofilter 100 is used to introduce the wastewater to be treated after the hydrolysis and acidification step into the biofilter 100 to decompose small molecular organic matter. The automobile painting wastewater treatment system 10 provided in this embodiment has a simple structure and a good sewage purification effect. At the same time, it has the characteristics of small footprint, low investment and operating costs, convenient operation and management, and has good social and economic benefits.

second embodiment

This embodiment provides a process for treating automobile painting wastewater, which is used to treat automobile painting wastewater. The steps are simple and the sewage purification effect is good. At the same time, it has good social and economic benefits.

The automobile painting wastewater treatment process provided in this embodiment is carried out by using the automobile painting wastewater treatment system 10 provided in the first embodiment.

The automobile painting wastewater treatment process provided in this embodiment includes: a pretreatment step, a coagulation reaction step, a precipitation removal step, a hydrolysis acidification step and a molecular decomposition step.

Pretreatment steps: degreasing the degreasing wastewater, precipitating the phosphating and passivating wastewater, precipitating the electrophoresis wastewater and pretreating the painting wastewater, and treating the degreasing wastewater, phosphating and passivating wastewater, The electrophoresis wastewater and painting wastewater are introduced into the coagulation reaction tank 400 to form wastewater to be treated.

In this embodiment, the degreasing wastewater is degreased by using degreasing wastewater treatment equipment. Phosphating passivation wastewater treatment equipment is used for precipitation treatment of phosphating passivation wastewater. Electrophoresis wastewater treatment equipment is used for precipitation treatment of electrophoresis wastewater. The spray paint wastewater is pretreated by using the spray paint wastewater treatment equipment.

In this embodiment, the pretreatment step includes degreasing the degreasing wastewater by using a belt type oil extraction machine. The degreasing wastewater treatment step also includes further removing grease in the degreasing wastewater by ultrafiltration equipment.

Coagulation reaction step: Coagulation reaction is carried out on the wastewater to be treated to remove phosphate ions, heavy metal ions (Zn2+, Ni+, Mn2+, etc.), paint substances, suspended solids and colloidal substances, etc.

In this embodiment, the coagulation reaction step includes adding alkalized substances into the coagulation reaction tank 400 to adjust the pH value in the coagulation reaction tank 400 to 11.0-12.0. Turn on 8 mixers at the same time to remove phosphate, nickel and manganese ions; after 10 minutes, add acid to adjust the pH value to 8.5-9.5 to remove Zn ions, and put in PAC and PAM after 10 minutes to remove paint, suspended particles and colloids Substance etc.

Precipitation removal step: import the wastewater to be treated after the coagulation reaction into the inclined tube sedimentation tank 300, settle the wastewater to be treated entering the inclined tube sedimentation tank 300, and remove the sludge containing sediment from the inclined tube sedimentation tank 300 .

In this embodiment, the sediment removal step can remove the sediment generated by the coagulation reaction, and the removal rate is as high as about 85%. If the SS index cannot be reached, it is led back to the coagulation reaction tank 400 through the sedimentation circulating water pump for circulation treatment; when it is qualified, the pH value is adjusted to acidity to provide guarantee for the subsequent hydrolysis and acidification steps.

Hydrolysis and acidification step: import the wastewater to be treated after the precipitation removal step into the hydrolysis tank 200, and perform hydrolysis and acidification on the wastewater to be treated in the hydrolysis tank 200, so as to convert the high molecular organic matter in the wastewater to small molecular organic matter.

It should be noted that the hydrolysis and acidification step can decompose high-molecular organic matter into small-molecular organic matter.

Molecular decomposition step: the waste water to be treated after the hydrolysis and acidification step is introduced into the biofilter 100 to decompose small molecular organic matter.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of vehicle coating wastewater handling process, for handling vehicle coating wastewater, the vehicle coating wastewater bag Include degreasing waste water, phosphatization passivating wastewater, electrophoresis waste water and painting wastewater, it is characterised in that the vehicle coating wastewater handles work Skill includes：

Pre-treatment step：Respectively to the degreasing waste water carry out ungrease treatment, to the phosphatization passivating wastewater carry out precipitation process, Precipitation process is carried out to the electrophoresis waste water and the painting wastewater is pre-processed, and the degreasing after processing is given up Water, the phosphatization passivating wastewater, the electrophoresis waste water and the painting wastewater import coagulation reaction tank, pending useless to be formed Water；

Coagulating step：Coagulating is carried out to the pending waste water；

Precipitate removal step：The pending waste water after coagulating will be carried out and import tube settler, sunk to entering inclined tube The pending waste water in shallow lake pond is precipitated, and the sludge containing the precipitation is removed from the tube settler；

Hydrolysis acidification step：The pending waste water after precipitation removal step will be carried out and import hydrolytic tank, and to the hydrolysis Acidifying is hydrolyzed in the pending waste water in pond, and the macromolecule organic in the pending waste water is changed into small point Sub- organic matter；

Molecule decomposition step：The pending waste water after acidification step will be hydrolyzed and imports biofilter, and to described small Molecular organic is decomposed.

2. vehicle coating wastewater handling process according to claim 1, it is characterised in that the pre-treatment step includes logical Cross belt involving swab machine and ungrease treatment is carried out to the degreasing waste water.

3. vehicle coating wastewater handling process according to claim 2, it is characterised in that the degreasing waste water treatment step Also include further removing the grease in the degreasing waste water by ultrafiltration apparatus.

4. vehicle coating wastewater handling process according to claim 1, it is characterised in that the coagulating step includes Alkali compound is put into the coagulation reaction tank to adjust the pH value in the coagulation reaction tank to 11.0-12.0.

5. the vehicle coating wastewater handling process according to any one in claim 1-4, it is characterised in that the automobile Coating wastewater handling process also includes sludge condensation step, and the sludge condensation step is included the institute in the tube settler State sludge and import sludge concentration tank, and carry out concentration.

6. vehicle coating wastewater handling process according to claim 5, it is characterised in that the sludge condensation step is also wrapped The sludge after concentration will be carried out and pass through the precipitation circulating pump importing the coagulation reaction tank by including.

7. a kind of Wastewater Disposal Line of Automobile Coating, using the vehicle coating wastewater as described in any one in claim 1-6 Handling process, it is characterised in that the Wastewater Disposal Line of Automobile Coating includes pretreatment system, coagulation reaction tank, inclined tube and sunk Shallow lake pond, hydrolytic tank and biofilter, the pretreatment system are connected with the coagulation reaction tank, the coagulation reaction tank with it is described Tube settler is connected, and the tube settler is connected with the hydrolytic tank, and the hydrolytic tank is connected with the biofilter.

8. Wastewater Disposal Line of Automobile Coating according to claim 7, it is characterised in that the pretreatment system includes de- Fat sewage treatment equipment, phosphatization passivating wastewater processing equipment, electrophoresis sewage treatment equipment and painting wastewater processing equipment, it is described de- At fat sewage treatment equipment, the phosphatization passivating wastewater processing equipment, the electrophoresis sewage treatment equipment and the painting wastewater Reason equipment is connected with the coagulation reaction tank.

9. Wastewater Disposal Line of Automobile Coating according to claim 8, it is characterised in that the biofilter includes filter tank Body, sewage induction pipe, water export pipe, blower fan, detection components, mixing component, air-valve assembly and heating component；

The filter tank body includes bottom wall, side wall and roof, and one end of the side wall is fixedly connected with the bottom wall, the side wall The other end be rotatably coupled with the roof；

The connects with the internal cavities of the sewage induction pipe and the filter tank body, the filter tank body is imported by the sewage；

The detection components are installed on the side wall；

The assembling is in the roof；

The mixing component includes slide rail, stirring parts and actuator, the slide rail is installed on the side wall, and the slide rail prolongs Stretch direction consistent with the bearing of trend of the side wall, the actuator is connected with the stirring parts, and the actuator can drive institute Stirring parts are stated to slide along the slide rail；

The connects with the internal cavities that the heating component passes through the air-valve assembly and the filter tank body；

The connects with the internal cavities of the water export pipe and the filter tank body, the treated sewage is exported described Filter tank body.

10. Wastewater Disposal Line of Automobile Coating according to claim 7, it is characterised in that at the vehicle coating wastewater Reason system also includes sludge concentration tank, and the tube settler and the hydrolytic tank are connected with the sludge concentration tank.