Treatment method of high saline wastewater

A treatment method and high-salt technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Water quality treatment standards and other issues, to achieve significant economic and social benefits, efficient economic treatment and recycling

Active Publication Date: 2015-06-10
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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AI Technical Summary

Problems solved by technology

Often a single stage of reverse osmosis or stage two stage cannot meet the water quality treatment standard
[0008] The above-mentioned single process is often difficult to overcome its own shortcomings when dealing with high-salt wastewater. Therefore, it is impossible to reduce costs and efficiently treat high-salt wastewater

Method used

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  • Treatment method of high saline wastewater
  • Treatment method of high saline wastewater
  • Treatment method of high saline wastewater

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Embodiment 1

[0068] Highly salty wastewater discharged from a chemical industry park, the wastewater COD≤200mg / L, TDS≤3000mg / L, NaCl≤3000mg / L, NaCl≤3000mg / L, Na 2 SO 4 ≤6000mg / L, total hardness ≤800mg / L,.

[0069] (1) chemical softening

[0070] Chemical softening uses the addition of NaOH and carbon dioxide to remove calcium and magnesium ions in wastewater. After the high-salt wastewater is precipitated by 25% NaOH and a certain amount of carbon dioxide, 8% to 12% polyferric sulfate (coagulant) and 0.8% PAM (coagulant) are added to the sedimentation tank for mixing. Most of the hardness and calcium and magnesium ions in coagulation precipitation, solid-liquid separation, and high-salt wastewater are removed. The added carbon dioxide comes from the exhaust gas of a certain factory in the industrial park. This method not only reduces the operating cost, but also enables the resource utilization of the exhaust gas of the factory. The treatment conditions and treatment results of chemica...

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Abstract

The invention discloses a treatment method of high saline wastewater, and relates to the treatment technology. The method comprises the following steps: preparing high saline wastewater, regulating in a regulating pond, chemically pre-treating in a settling pond, filtering in a V-shaped filter pond, the first section ion exchange softening, ultrafiltering in an ultrafiltration system, reverse osmosis treating through a first section reverse osmosis system, the second ion exchange softening, nano-filtering through a high-pressure nano-filtration system, nano-filtering to produce water, reverse osmosis treating through a second section reverse osmosis system, concentrating through a first section high-pressure flat film system, MVR evaporating and crystallizing to obtain the industrial level sodium chloride; nano-filtering to concentrate water, concentrating through a second section high pressure flat film system, freezing and crystallizing to obtain the industrial level mirabilite. The ultra-filtration, the nano-filtration, the reverse osmosis and high-pressure flat film methods are reasonably coupled to combine with the MVR crystallization and freezing crystallization to treat the high saline wastewater, the defect of single technology is overcome, the combination advantage is developed, the problems of efficiently and economically treating and recycling the high saline wastewater can be solved, and the treatment method has obvious economic benefit and social benefit.

Description

technical field [0001] The invention relates to a treatment method for high-salt wastewater, in particular to a treatment method for high-salt wastewater treatment and resource utilization. Background technique [0002] In recent years, with the development of society and the improvement of environmental protection awareness, the "National Environmental Protection "Eleventh Five-Year" Plan" clearly requires the promotion of waste water recycling in heavy industries such as iron and steel, electric power, chemical industry, and coal, and strives to achieve zero discharge of waste water. [0003] The high-salt waste water in the present invention mainly comes from the gas washing waste water in the chemical production process, the discharge water from the circulating water system, the discharge water from the chemical water station and a small amount of organic waste water after biochemical treatment. It is characterized by high concentrations of suspended solids (SS) and tota...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/06C01D5/16
Inventor 王俊辉王成端刘兴勇张峰臻赛世杰杭天浜刘慧刘丹茹孟庆军李思序李乐郭默然姚红锐
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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