Method for separating salt from coal-chemical-industry wastewater through electroosmosis technique

A technology of coal chemical wastewater and electrodialysis, applied in chemical instruments and methods, general water supply conservation, inorganic chemistry, etc., can solve the problems of no application reports, avoid solid waste landfill, improve secondary utilization value, and realize repeated use The effect of using

Active Publication Date: 2016-08-31
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the application of electrodialysis in the field of desalination of coal chemical wastewater.

Method used

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  • Method for separating salt from coal-chemical-industry wastewater through electroosmosis technique
  • Method for separating salt from coal-chemical-industry wastewater through electroosmosis technique
  • Method for separating salt from coal-chemical-industry wastewater through electroosmosis technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The electrodialysis equipment used in this example is the CJED-90*210-5 type equipment produced by Hefei Kejia Polymer Material Technology Co., Ltd. The electrodialysis cation exchange membrane and anion exchange membrane used are respectively Hefei Kejia polymer CJMC and CJMA membranes produced by Material Science and Technology Co., Ltd.

[0024] The raw water of coal chemical industry wastewater is pretreated, including removal of organic matter, removal of heavy metals, softening treatment, filtration, and RO concentration, so that the TDS of the RO concentrate is 45000-55000mg / L, and the COD content is 550-700mg / L.

[0025] The electrodialysis experiment of the present embodiment is the COD and salt in the separation waste water of one-stage electrodialysis, specifically, the waste water of different concentrations is taken and processed in batches, and each batch of waste water (electrodialysis desalination chamber) is 6L, in order to improve the concentrated solut...

Embodiment 2

[0030]Concentrate again for the primary electrodialysis concentrated water (TDS is 91500 mg / L) in Example 1. The concentration methods here are generally multi-effect evaporation and MVR, but the operation energy consumption of these two processes is relatively high, and electrodialysis is an ideal concentration method. Therefore, in this embodiment, the concentrated water of the first-stage electrodialysis is reconcentrated by the second-stage electrodialysis. The electrodialysis equipment is the same as the equipment in Example 1. During the operation of the second-stage electrodialysis, the voltage is fixed at 6V, and the feed materials of the concentration chamber and the desalination chamber are concentrated water of the first-stage electrodialysis, and the volume ratio of the concentration chamber and the desalination chamber is 1. :4 and 1:5, the experiment runs until the TDS of the second-stage electrodialysis fresh water drops below 30000mg / L, stops the concentration,...

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Abstract

The invention discloses a method for separating a salt from coal-chemical-industry wastewater through an electroosmosis technique. The method for separating the salt from the coal-chemical-industry wastewater through the electroosmosis technique is characterized by comprising the following steps of firstly, carrying out pretreatment on raw water of the coal-chemical-industry wastewater, then introducing the wastewater subjected to the pretreatment into primary electroosmosis, so as to realize the separation between the salt and a COD (Chemical Oxygen Demand), afterwards, introducing thick water subjected to the primary electroosmosis into secondary electroosmosis to carry out concentration, and separating out sodium sulfate and sodium chloride from an obtained concentrated solution through post-treatment, thereby completing treatment. According to the method provided by the invention, by applying the characteristic that the salt can be separated and concentrated through electroosmosis, the COD and the salt in the coal-chemical-industry wastewater which is subjected to the pretreatment are separated; afterwards, the separated salt is concentrated; the difficult problems of the separation and the recovery of the salt in the coal-chemical-industry wastewater are solved; the sufficient utilization of a solid salt resource is realized; further, a whole technical process is free from the emission of pollutants and is green and environmentally-friendly; the zero emission, in a real sense, of the coal-chemical-industry wastewater can be realized.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a high-salt coal chemical wastewater treatment process. Background technique [0002] In recent years, with the rapid development of the coal chemical industry, the wastewater produced in the coal chemical process has an increasing impact on the environment. zero emission". Coal chemical industry wastewater is mainly high-concentration coal gas washing wastewater, and also includes coking wastewater, coal gasification black water, coal direct / indirect liquefaction wastewater, and wastewater generated during the preparation of synthesis gas conversion catalysts. Wastewater contains a large amount of toxic and harmful substances such as phenol, cyanide, oil, ammonia nitrogen, etc. The huge discharge of waste water seriously restricts the continued development of the coal chemical industry. At present, coal chemical wastewater treatment methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01D3/06C01D5/00
CPCY02A20/131C02F9/00C01D3/06C01D5/00C02F1/001C02F1/441C02F1/4693C02F5/00C02F2301/08
Inventor 汪耀明颜海洋李为周永明吴亮李传润张勤
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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