Complete process for treating coated industrial waste water

Abstract

A complete treating technology for the coating sewage includes such steps as regulating pH value of said sewage, adding flocculant, coagulating reaction, separating out supernatant by slant-tube depositor, removing floating dregs by combined air-floating unit, biochemical treating by elastic filler YDT and biomembrane reactor, disinfecting, and reusing the resultant water.

Description

technical field

[0001] The invention relates to the treatment technology of industrial wastewater, in particular to the technical field of coating wastewater treatment. Background technique

[0002] Automobile (or other mechanical equipment) painting is the main measure to protect and decorate automobiles (or other mechanical equipment), and it is one of the very important manufacturing processes. The water pollutants discharged during the coating process, such as resins, surfactants, phosphates, and high-concentration organic matter, can cause serious pollution. Due to the complex composition of coating wastewater and irregular discharge, the water quality changes greatly, the treatment equipment has a long process, many types, covers a large area, time-consuming and labor-intensive operation, and high operating costs. Water cannot be reused for production. Contents of the invention

[0003] The purpose of the present invention is to invent a complete treatment process ...

Examples

Embodiment Construction

[0029] As shown in Figure 1:

[0030] 1. Pretreatment of waste liquid discharged from phosphating and passivation processes:

[0031] Add medicine to the waste liquid discharged from the phosphating and passivation process to precipitate phosphide, and use an inclined tube precipitator to separate the supernatant; mix the supernatant into the wastewater to be treated.

[0032] According to the different components of the phosphating and passivation waste liquid, lime milk can be added to the phosphating and passivation waste liquid to precipitate phosphide, or calcium chloride and sodium hydroxide can be added to precipitate phosphide.

[0033] 2. Pretreatment of waste liquid discharged from electrophoresis, topcoat and degreasing processes:

[0034] Add inorganic flocculant salts such as ferric chloride or aluminum chloride to the waste liquid discharged from the electrophoresis, topcoat, and degreasing processes to precipitate solid suspended matter and other heavy metal hy...

technical field

[0001] The invention relates to the treatment technology of industrial wastewater, in particular to the technical field of coating wastewater treatment. Background technique

[0002] Automobile (or other mechanical equipment) painting is the main measure to protect and decorate automobiles (or other mechanical equipment), and it is one of the very important manufacturing processes. The water pollutants discharged during the coating process, such as resins, surfactants, phosphates, and high-concentration organic matter, can cause serious pollution. Due to the complex composition of coating wastewater and irregular discharge, the water quality changes greatly, the treatment equipment has a long process, many types, covers a large area, time-consuming and labor-intensive operation, and high operating costs. Water cannot be reused for production. Contents of the invention

[0003] The purpose of the present invention is to invent a complete treatment process ...

Examples

Embodiment Construction

[0029] As shown in Figure 1:

[0030] 1. Pretreatment of waste liquid discharged from phosphating and passivation processes:

[0031] Add medicine to the waste liquid discharged from the phosphating and passivation process to precipitate phosphide, and use an inclined tube precipitator to separate the supernatant; mix the supernatant into the wastewater to be treated.

[0032] According to the different components of the phosphating and passivation waste liquid, lime milk can be added to the phosphating and passivation waste liquid to precipitate phosphide, or calcium chloride and sodium hydroxide can be added to precipitate phosphide.

[0033] 2. Pretreatment of waste liquid discharged from electrophoresis, topcoat and degreasing processes:

[0034] Add inorganic flocculant salts such as ferric chloride or aluminum chloride to the waste liquid discharged from the electrophoresis, topcoat, and degreasing processes to precipitate solid suspended matter and other heavy metal hy...

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