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Method for treating electronic waste recovery wastewater

A technology for electronic waste and waste water, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficulty in recycling, waste of resources, pollution of the environment, etc., and achieve technical stability Good, high recycling efficiency, low cost effect

Inactive Publication Date: 2019-06-04
FAREAST KINGSTAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of electronic waste recycling, wastewater treatment has generally received attention. At present, recycling companies pay more attention to and research the recovery and treatment of valuable metals, but there are a large number of other metal salts in wastewater. Due to the difficulty of recycling and high processing costs, many companies Abandon recycling and adopt direct discharge, which pollutes the environment and wastes resources

Method used

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Examples

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Embodiment Construction

[0011] The following is a specific embodiment of the present invention. This embodiment comprises the following steps:

[0012] (1) Membrane separation process treatment: Metal salt wastewater is treated by membrane separation process to obtain purified water and concentrated water, which can be recycled.

[0013] (2) Concentrated water treatment: The concentrated water obtained after the membrane separation process is subjected to a high-temperature 50-150°C evaporation process and a low-temperature -150-25°C crystallization process in sequence, so that the salt in the concentrated water is crystallized and recovered. .

[0014] (3) Mother liquor circulation treatment: The mother liquor after salt crystallization in concentrated water is selectively returned to the concentrated water treatment step.

[0015] The pH of the metal salt wastewater is 5.5-10, and the content of each heavy metal is less than 2 mg / L.

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Abstract

The invention relates to the technical field of wastewater treatment, particularly to a method for treating electronic waste recovery wastewater. The method comprises: (1) treatment through membrane separation process: treating metal salt wastewater by using a membrane separation process to obtain purified water and concentrated water, wherein the purified water can be recycled; (2) concentrated water treatment: sequentially carrying out high-temperature evaporation process (50-150 DEG C) and low-temperature crystallization process (-150-25 DEG C) on the concentrated water obtained by the membrane separation process to crystallize and precipitate the salt in the concentrated water; and (3) mother liquor circulation treatment: making the mother liquor obtained in the step (2) selectively return to the concentrated water treatment step. The method of the present invention has advantages of high recovery efficiency, low cost and good technical stability.

Description

(1) Technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for recycling waste water from electronic waste. (2) Background technology [0002] With the rapid development of electronic waste recycling, wastewater treatment has generally attracted attention. At present, recycling companies pay more attention to and research the recovery and treatment of valuable metals, but there are a large number of other metal salts in wastewater. Due to the difficulty of recycling and high processing costs, many companies Abandoning recycling and adopting direct discharge will pollute the environment and waste resources. (3) Contents of the invention [0003] In order to make up for the deficiencies of the prior art, the invention provides a method for recycling waste water from electronic waste with a high recovery rate. [0004] The present invention is achieved through the following technical solutions: [0005] A meth...

Claims

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Application Information

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IPC IPC(8): C02F9/10
Inventor 孙志强
Owner FAREAST KINGSTAR CHEM