Coating wastewater treatment process

A technology of coating wastewater and process flow, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex wastewater components, environmental pollution, hazards, etc., and achieve improvement Environmental quality, simple process, and the effect of improving utilization rate

Inactive Publication Date: 2015-09-02
SUZHOU RUIYUTE AUTOMATION TECH
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  • Abstract
  • Description
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Problems solved by technology

[0002] Coating is widely used in machinery, automobiles, elevators, home appliances, fixtures, and electronics industries. Coating wastewater is extensive. The coating industry is a key sewage discharge industry in the environmental protection industry, which is harmful to the environment. There are many types of wastewater produced in the coating industry. Workpiece pretreatment, degreasing, surface adjustment, phosphating treatment, passivation treatment, electrophoresis, spraying, and painting processes all produce wastewater. The composition of the wastewater is complex, and the wastewater contains resins, surfactants, heavy metal ions, and paint block pigments. substances, pigments are toxic, and also contain carcinogens such as nickel ions, if not handled properly, it will cause serious pollution to the environment

Method used

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Embodiment Construction

[0022] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0023] Described painting wastewater treatment technological process comprises the following steps:

[0024] Step 1: Filter the rust, copper rust blocks, and other massive objects generated during the pre-painting process of the workpiece through the coarse fence and the fine fence to remove the massive particles and scum.

[0025] Step 2: Pre-treat the grease wastewater generated during the workpiece coating process. The grease-containing wastewater is treated using physical methods, using an emulsifiable oil absorption machine to absorb grease.

[0026] The third step: after the second step of the oil-containing wastewater treatment, the oil-containing wastewater is concentrated in the grease-...

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Abstract

The invention discloses a coating wastewater treatment process which comprises the following steps: filtering through a crude fence and a fine fence, carrying out demulsification treatment on grease wastewater, dewatering sludge for recovery, carrying out surface phosphating on the workpiece, carrying out centralized treatment on electrophoresis wastewater, carrying out centralized treatment on the high-polymer resins, pigments, powder, surfactant and assistants in the coating wastewater, floating, carrying out aeration purification, mixing with low-concentration wastewater, carrying out batch treatment on the wastewater, inoculating into a biological oxidation pool, carrying out secondary treatment on the wastewater, trapping high-molecular organic substances by a membrane separation technique, adding sodium hypochlorite into ammonia nitrogen, recovering salts, filtering through drift sand, filtering the wastewater through activated carbon, and discharging the purified water. The coating wastewater treatment process is simple in technique and enhances the wastewater recovery and utilization ratio.

Description

technical field [0001] The invention relates to the field of painting automation, in particular to a painting wastewater treatment process. Background technique [0002] Coating is widely used in machinery, automobiles, elevators, home appliances, fixtures, and electronics industries. Coating wastewater is extensive. The coating industry is a key sewage discharge industry in the environmental protection industry, which is harmful to the environment. There are many types of wastewater produced in the coating industry. Workpiece pretreatment, degreasing, surface adjustment, phosphating treatment, passivation treatment, electrophoresis, spraying, and painting processes all produce wastewater. The composition of the wastewater is complex, and the wastewater contains resins, surfactants, heavy metal ions, and paint block pigments. Substances and pigments are toxic and contain carcinogens such as nickel ions. If not handled properly, they will cause serious pollution to the enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 王华
Owner SUZHOU RUIYUTE AUTOMATION TECH
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