Electronic electroplating wastewater recycling advanced treatment technology

A technology for advanced treatment of electroplating wastewater, applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficulty in selecting functional bacteria, high cost of chemicals, and few examples

Inactive Publication Date: 2010-06-16
苏州市环境工程有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of the chemical method are: cumbersome operation and management, high cost of chemicals, and easy to produce secondary pollution; it is difficult to select functional bacteria by the biological method; although the adsorption method and ion exchange method in the physical chemical method can effectively treat heavy metal-containing wastewater, when When it regenerates, the pollutants are regenerated
At present, only some enterprises consider reuse of wastewater that meets the standards for domestic water (toilet flushing or greening) and production flushing water that does not have strict water quality requirements. There are few examples of wastewater reuse for production processes that require strict water quality. Technology that has not been popularized and applied

Method used

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  • Electronic electroplating wastewater recycling advanced treatment technology
  • Electronic electroplating wastewater recycling advanced treatment technology
  • Electronic electroplating wastewater recycling advanced treatment technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: An advanced treatment process for reuse of electronic electroplating wastewater

[0034] The technological process of this technical scheme is as attached figure 1 shown.

[0035] Taking copper-containing cleaning wastewater generated in the production process of printed circuit board (PCB) enterprises as an example, advanced wastewater treatment and reuse are carried out.

[0036] (1) pH adjustment + microfiltration membrane treatment system

[0037] Taking the copper-containing cleaning wastewater generated by PCB enterprises as the treatment object, after the wastewater is discharged into the storage tank, the raw water quality monitoring structure is as follows: the pH value of the wastewater is 4.5, the COD is 173mg / l, and the Cu is 136mg / l. First, pump the cleaning wastewater to the first pH adjustment tank, add sodium hydroxide to the first pH adjustment tank to control the pH value at about 9-10, then pump the wastewater to the coagulation tank, ...

Embodiment 2

[0047] Example 2: An advanced treatment process for reuse of electronic electroplating wastewater

[0048] One, process flow chart copper embodiment one

[0049] Electroplating wastewater for the following water quality indicators:

[0050] (1) The chemical oxygen demand is 184mg / l;

[0051] (2) The copper content is 127mg / l, and the nickel content is 0.5mg / l;

[0052] (3) Conductivity less than or equal to 2400μs / cm;

[0053] Take the following steps to process:

[0054] The first step: adjust the pH value of the treated electronic electroplating wastewater to 9.7, then add a coagulant to it and stir, so that the metal ions in the electronic electroplating wastewater react to form metal hydroxides and then precipitate; after adding the coagulant And the pH value is maintained at 9-10 during the stirring process; the coagulant is ferric chloride.

[0055] The second step: using the microfiltration membrane to process the treatment liquid obtained in the first step under t...

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Abstract

The invention relates to an electronic electroplating wastewater recycling advanced treatment technology. The technology uses a large amount of rinse-wastewater with heavy metals in the production process of the electronic electroplating industry as the main object, adopts a combined technology of pH adjustment-microfiltration membrane treatment-pretreatment-reverse osmosis membrane treatment, is mainly characterized by the joint application of DF membrane technology and RO membrane technology and can achieve the aim of reusing wastewater and reducing the emission of heavy metals; and the reuse water reaches the production demand of process water, thus saving the fresh water consumption of the industry, effectively reducing the production cost of the industry, solving the pollution problem of heavy metals, increasing the clean production level of the electronic electroplating industry and having remarkable social environmental and economic benefits.

Description

technical field [0001] The invention relates to an advanced treatment process for reuse of electronic electroplating wastewater, which is mainly used for treating heavy metal cleaning wastewater produced in the electronic electroplating industry, and belongs to the technical field of wastewater treatment. Background technique [0002] The electronic electroplating industry is an industry with large water consumption and serious pollution. Taking the electronic information and precision machinery industries as examples, in the process of product manufacturing and processing, various types of wastewater with complex pollutants are produced, among which the pollution of heavy metals is particularly serious. Heavy metal wastewater It is a potentially extremely harmful category of wastewater in the electronic electroplating industry. It mainly contains copper (Cu), nickel (Ni), etc. If these electronic electroplating wastewater containing a large amount of heavy metal pollutants a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 邵正锋程育红孙荣生陈慧科俞强郭菊花沈娟
Owner 苏州市环境工程有限责任公司
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