Process and device for zero discharge treatment of coal chemical wastewater

A coal chemical wastewater and treatment process technology, applied in the field of water treatment, can solve the problems of calcium and magnesium reverse osmosis, scaling of evaporation devices, low utilization of solid waste, etc., and achieve the effects of reducing pollution, avoiding scaling, and improving floating efficiency

Active Publication Date: 2017-11-03
SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low utilization of solid waste and easy fouling of reverse osmosis and evaporation devices caused by calcium and magnesium in the process of zero discharge of high-salt wastewater in coal chemical industry, and propose a zero discharge treatment of coal chemical wastewater Process and device

Method used

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  • Process and device for zero discharge treatment of coal chemical wastewater
  • Process and device for zero discharge treatment of coal chemical wastewater
  • Process and device for zero discharge treatment of coal chemical wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0089] In the first step, 0.05wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 0.8cm, and the current density is 3.5A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 200s; the electrocoagulation sludge is sent to dehydration and incineration;

[0090] Step 2: Pre-adding acid to control the pH value of the water produced by electricity regulation flocculation is 4-6, and through aeration to make the dissolved oxygen of the wastewater 2mg / L, send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 1h; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filings to powder...

Embodiment 2

[0096] In the first step, 0.2wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 1.2cm, and the current density is 5.5A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 350s; the electrocoagulation sludge is sent to dehydration and incineration;

[0097] Step 2: Pre-adding acid to control the pH value of the water produced by electric regulation and flocculation is 4 to 6, and through aeration to make the dissolved oxygen of the wastewater 3mg / L, and send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 2.5h; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filing...

Embodiment 3

[0103] In the first step, 0.1wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 1.0m, and the current density is 4.0A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 200-350s; the electrocoagulation sludge is sent to dehydration and incineration;

[0104] Step 2: Pre-adding acid to control the pH value of the water produced by electricity regulation flocculation is 4-6, and through aeration to make the dissolved oxygen of the wastewater 2mg / L, send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 2 hours; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filings ...

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Abstract

The invention relates to a process and device for zero discharge treatment of coal chemical wastewater and belongs to the technical field of water treatment. The process comprises the steps of adding a bio-surfactant into coal wastewater, and then causing the bio-surfactant to undergo electric flocculation treatment; causing electric flocculation sludge to undergo dehydration and incineration treatment; sending water generated by the electric flocculation into an iron carbon microelectrolysis tower for oxidation treatment; adding NaOH and Na2CO3 into the water generated by iron carbon microelectrolysis, and causing calcium and magnesium in salt-containing wastewater to precipitate; sending the obtained wastewater into a ceramic ultrafiltration membrane to be filtered, and sending a concentrated solution of a nanofiltration membrane into a first evaporator for evaporation and crystallization, and obtaining recycled Na2SO4; sending water generated by the nanofiltration membrane into a reverse osmosis membrane for filtration, sending a concentrated solution of the reverse osmosis membrane for evaporation and crystallization, and obtaining recycled NaCl.

Description

technical field [0001] The invention relates to a zero-discharge treatment process and device for coal chemical wastewater, belonging to the technical field of water treatment. Background technique [0002] The modern coal chemical industry is a new type of industry that takes coal as raw material, converts coal into gas, liquid and solid products through chemical processing, and further processes it into a series of chemical products. It mainly includes coal gasification, coal liquefaction, tar chemistry, and calcium carbide acetylene chemistry. In recent years, the coal chemical industry has developed rapidly. The problem of environmental protection has become increasingly prominent, especially in areas with a lot of drought and little rain. Therefore, the environmental protection problems of coal chemical industry urgently need to be solved. [0003] Wastewater in the coal chemical industry mainly includes two types, one is process wastewater, domestic sewage, etc. Cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/001C02F1/04C02F1/441C02F1/442C02F1/444C02F1/463C02F1/4672C02F1/5236C02F9/00C02F2301/08
Inventor 毛强平
Owner SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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