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Method for pre-treating inverted trough water of electroplating pre-treatment

A pre-treatment and pre-treatment technology for electroplating, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc.

Active Publication Date: 2012-02-15
ZHEJIANG HI TECH ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The oil-water separation technology is only suitable for chemical degreasing and separation of oil stains with heavy oil slicks, and its ability to remove oil stains in an emulsified state is poor; while the Fenton oxidation method has high treatment costs, a large amount of mud, and is difficult to control

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  • Method for pre-treating inverted trough water of electroplating pre-treatment
  • Method for pre-treating inverted trough water of electroplating pre-treatment
  • Method for pre-treating inverted trough water of electroplating pre-treatment

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Embodiment Construction

[0018] In this embodiment, the electroplating tank liquid with high organic pollution load and difficult treatment is selected as the processing object, and the acid analysis-three-dimensional electrolysis technology is used to pretreat the tank water. The specific process is called: see figure 1

[0019] (1) Processing object

[0020] Degreasing tank water and wax removing tank water of an electroplating factory in Wenzhou, Zhejiang, among which degreasing tank water COD Cr =8180mg / L; COD of wax removal tank water Cr =52600mg / L; the pH value is around 10.

[0021] (2) Process flow

[0022] A: acid analysis process

[0023] Dewaxing and pouring tank water: Take the water sample in a red plastic bucket, add concentrated sulfuric acid while stirring, adjust the pH value to 2.0, stir for 5 minutes, let it stand, take the supernatant liquid, and the waste wax in the lower layer is processed by a professional oil company Recycle.

[0024] Degreasing and pouring tank water: Ta...

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Abstract

The invention provides a method for pre-treating inverted trough water of electroplating pre-treatment. The method is characterized by comprising the following steps of: combining acid out and three-dimensional electrolysis technologies; slowly adding concentrated sulfuric acid into the wax-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking supernatant; slowly adding the concentrated sulfuric acid into oil-removing inverted trough water, regulating pH to be 2.0, stopping adding, standing, and demixing; taking subnatant; and mixing two clear solutions, and feeding the mixture in a three-dimensional electrolysis device for electrolysis treatment. According to the method, waste oil and waste wax in the inverted trough can be effectively reclaimed, catalytic decomposition of organic matters in the waste water can be improved, and the biochemical performance of the waste water can be improved.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a pretreatment method for treating poured tank water before electroplating. technical background [0002] The pretreatment of the plated parts in the electroplating process is an important link, mainly to remove the grease and wax on the surface of the plated parts. Some basic compounds are commonly used in the process of electroplating degreasing. For parts with particularly serious oil pollution, organic solvents such as kerosene, gasoline, acetone, toluene, trichloroethylene, and carbon tetrachloride are sometimes used to degrease, and then chemical alkaline degreasing. In order to remove certain mineral oils, a certain amount of emulsifier, such as OP emulsifier, AE emulsifier, triethanolamine oleic acid soap, etc., is usually added to the oil removal solution. Therefore, the cleaning wastewater and renewal waste liquid produced in the degreasing process are alkaline wastewat...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16
Inventor 楼洪海刘祥虎吴玉华何晓杰夏其武王闻超
Owner ZHEJIANG HI TECH ENVIRONMENTAL TECH
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