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A salt separation process for industrial wastewater

A technology for industrial wastewater and coal chemical wastewater, which is applied in general water supply conservation, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of reducing emissions, simple and feasible technical solutions, and reducing costs and pressures

Active Publication Date: 2017-07-14
INNER MONGOLIA CHINACOAL YUANXING ENERGY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although this technology can achieve the goal of "zero discharge" of sewage / wastewater, its biggest disadvantage is that the crystalline salt is a mixed miscellaneous salt, which contains a variety of inorganic substances and a large amount of organic substances, and the miscellaneous salt is extremely soluble. Poor stability and solidification, can seep out with the rain, causing secondary pollution
In addition, miscellaneous salt is hazardous waste, and the treatment cost is high. At present, the treatment cost of hazardous solid waste is about 3,000 yuan / ton, which greatly increases the operating cost of the enterprise.

Method used

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  • A salt separation process for industrial wastewater
  • A salt separation process for industrial wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 1. Coal chemical wastewater pretreatment

[0060] (1) will 100m 3 The TDS / h is 5560mg / L coal chemical wastewater into the high-density clarifier, and add 2kg / m 3 A mixture of an appropriate amount of polyferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide, and polyacrylamide (the weight ratio of polyferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide, and polyacrylamide is: 50: 20:10:5:5), filter the sediment, soften the water;

[0061] (2) the water to be treated in step (1) passed through ozone for 1 hour, then measure the B / C value;

[0062] (3) The wastewater oxidized by ozone in step (2) flowed to the biochemical pool for reaction for 12 hours;

[0063] (4) When the oxygen supply is 95%, the waste water in step (3) is filtered and adsorbed through the MBR membrane biological reaction tank; then the filtered water is sent to the ion exchanger for deep softening treatment, and sent Go to the next step of desalination treatment;...

Embodiment 2

[0081] 1. Coal chemical wastewater pretreatment

[0082] (1) will 200m 3 The TDS / h is 5560mg / L coal chemical wastewater into the high-density clarifier, and add 5kg / m 3 The mixture of polymerized ferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide and polyacrylamide (the weight ratio of polymerized ferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide and polyacrylamide is: 175:60: 30:15:12), filter sediment, water softening;

[0083] (2) the water to be treated in step (1) passed through ozone for 2 hours, then measure the B / C value;

[0084] (3) The wastewater oxidized by ozone in step (2) flowed to the biochemical pool for reaction for 18 hours;

[0085] (4) When the oxygen supply is 100%, the waste water in step (3) is filtered and adsorbed through the MBR membrane bioreactor; then the filtered water is sent to the ion exchanger for deep softening treatment, and sent Go to the next step of desalination treatment; the ion exchanger is r...

Embodiment 3

[0103] 1. Coal chemical wastewater pretreatment

[0104] (1) will be 300m 3 The TDS / h is 7280mg / L coal chemical wastewater into the high-density clarifier, and add 8kg / m 3 A mixture of polymeric ferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide and polyacrylamide (the weight ratio of polymeric ferric sulfate, sodium carbonate, calcium hydroxide, sodium hydroxide and polyacrylamide is 300:100:50 :25:20), filter sediment, water softening;

[0105] (2) the water to be treated in step (1) was passed through ozone for 1-3 hours, then measure the B / C value;

[0106] (3) The wastewater oxidized by ozone in step (2) flowed to the biochemical pool for reaction for 24 hours;

[0107] (4) When the oxygen supply is 100%, the waste water in step (3) is filtered and adsorbed through the MBR membrane bioreactor; then the filtered water is sent to the ion exchanger for deep softening treatment, and sent Go to the next step of desalination treatment; the ion exchanger i...

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Abstract

The invention discloses a salt separation process for industrial wastewater, which belongs to the field of high-salt wastewater treatment. The present invention is aimed at coal chemical industry wastewater and coal mine drainage water. The first step is to reduce the amount through the double-membrane method, and the second step is a "zero discharge" salt separation system, which further concentrates the reduced high-concentration brine, evaporates and crystallizes it. Salt separation treatment, to achieve the goal of "zero discharge" of wastewater, resource utilization of crystalline salt, and reduction of miscellaneous salt. The anhydrous sodium sulfate produced by the technical scheme of the present invention meets the first-class standard of Class I of GB / T 6009-2014 "Industrial Anhydrous Sodium Sulfate", and the sodium chloride meets the standard of GB / T 5462-2015 "Industrial Salt" refined industrial salt The first grade salt standard, the technical solution is simple and feasible, and the operation is convenient and suitable for further large-scale promotion and application.

Description

technical field [0001] The invention belongs to the field of high-salt wastewater treatment, and relates to a salt separation process for industrial waste water, in particular to a salt separation process for coal chemical industry waste water and coal mine drainage water. Background technique [0002] In recent years, with the development of industrial and agricultural production and the improvement of urban people's living standards, the discharge of industrial wastewater and urban sewage is increasing. The resulting environmental pollution has seriously affected environmental ecology and human health, especially high-salt The discharge of high-concentration organic wastewater is becoming more and more serious, which is one of the important reasons for water environment pollution. The main ion contained in high-salt organic wastewater is Cl - , SO 4 2- 、Na + , Ca 2+ and other salts. High-concentration ions will inhibit and poison microorganisms, mainly manifested in:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCY02A20/131
Inventor 唐多钦杨俊殷智葛向辉杨怀忠韩舜才包双峰张波权秋红张建飞石维平王志稳张普寨周辉郭以果黄瑞
Owner INNER MONGOLIA CHINACOAL YUANXING ENERGY CHEM CO LTD
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