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Recycling treatment process for coal coking high-salinity wastewater

A technology of high-salt wastewater and treatment process, which is applied in the direction of oxidized water/sewage treatment, multi-stage water treatment, water/sewage treatment, etc., which can solve the problem of increasing the scaling risk of subsequent membrane systems and evaporation crystallization systems and increasing the economic burden of enterprises , No fouling substances and other issues are considered to achieve the effect of reducing ozone dosage, realizing zero emission and resource utilization, and reducing TOC and chroma

Pending Publication Date: 2019-12-24
CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes limited pretreatment of organic matter in wastewater, but does not consider scaling substances such as fluoride ions, calcium magnesium ions, and silicon in wastewater, which will increase the risk of fouling in subsequent membrane systems and evaporation crystallization systems, and will These impurities are also mixed in the crystallized salt produced
[0007] It can be seen from the above that the prior art coal coking high-salt wastewater zero discharge project only concentrates and crystallizes the salt into mixed salt, which has no reuse value, and is managed as hazardous waste, and the disposal cost is high, which increases the economic burden of the enterprise

Method used

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  • Recycling treatment process for coal coking high-salinity wastewater

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Embodiment 1

[0050] RO concentrated water of coking wastewater advanced treatment system in a coal coking plant, water quality: pH 7~8, fluoride ion 100~150mg / L, silicon content 15~25mg / L, chloride 2000~2800mg / L, sulfate 6000~6500mg / L L, total hardness 300-500mg / L, TDS 13000-15000mg / L, COD 300-500mg / L. The waste water flow rate is 30t / h, and it runs for 20 hours per day.

[0051] Include the following steps:

[0052] (1) Fluoride removal: the fluoride ion content of the raw water is 115mg / L, and the pH is 7.84. Calcium chloride and 50ppm ferric chloride are added to the first-level defluoridation coagulation tank according to the calcium-fluorine molar ratio of 1.2:1, and the residence time is 15 minutes before entering the first-level flocculation tank; Secondary sedimentation tank; the residence time of the first-level sedimentation tank is 2h, and the effluent overflows into the second-level defluoridation coagulation tank. The pH is adjusted to 7.50 by sodium hydroxide, and calcium c...

Embodiment 2

[0065] RO Concentrated Water Quality of Coal Coking Wastewater Advanced Treatment System of a Coal Coking Plant: pH 7~8, Fluoride Ion 150~200mg / L, Silicon Content 20~30mg / L, Chloride 2300~2900mg / L, Sulfate 6500~7200mg / L L, total hardness 300~500mg / L, TDS 12000~14000mg / L, COD 250~400mg / L. The waste water flow rate is 20t / h, and it runs 22 hours a day.

[0066] Include the following steps:

[0067] (1) Fluoride removal: the fluoride ion content of the raw water is 179mg / L, and the pH is 7.26. Calcium chloride and 50ppm ferric chloride are added to the first-level defluoridation coagulation tank according to the calcium-fluorine molar ratio of 1.2:1, and the residence time is 15 minutes before entering the first-level flocculation tank; Grade-1 sedimentation tank; the residence time of the first-level sedimentation tank is 2h, and the effluent overflows into the second-level defluoridation coagulation tank. The pH is adjusted to 7.50 by sodium hydroxide, and calcium chloride an...

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Abstract

The invention relates to a recycling treatment process for coal coking high-salinity wastewater. The process comprises the following steps: (1) fluorine removing; (2) silicon removing; (3) softening;(4) treatment with a multi-medium filter; (5) ultrafiltration; (6) resin softening; (7) FDG; (8) nanofiltration and salt separation; (9) reverse osmosis concentration; (10) advanced oxidation; (11) resin adsorption; and (12) evaporative crystallization. The process has the advantages that the process of pretreatment, nanofiltration salt separation, reverse osmosis concentration, advanced oxidationand evaporative crystallization is adopted, so that zero emission and quality-divided resource utilization of the coal coking high-salinity wastewater are realized.

Description

technical field [0001] The invention relates to a high-salt wastewater resource treatment process in the coal coking industry, which belongs to the technical field of wastewater treatment. Background technique [0002] After years of continuous development, the coal coking industry has become an important part of the clean and efficient utilization of coal in my country. However, the traditional coal coking industry consumes a lot of water, has a high content of pollutants, and has relatively complex components. In addition, in recent years, the shortage of water resources and the increasingly serious problem of water pollution have led to the tightening of national environmental protection policies, requiring the coking industry to recycle and reuse coking wastewater to achieve Zero discharge of coking wastewater saves water resources to the greatest extent and reduces environmental pollution without affecting local economic and social development and ecological environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/14C02F101/30
CPCC02F1/001C02F1/04C02F1/20C02F1/28C02F1/441C02F1/442C02F1/444C02F1/5236C02F1/56C02F1/66C02F1/725C02F1/78C02F9/00C02F2001/007C02F2001/425C02F2101/14C02F2101/30C02F2301/08
Inventor 刘佳高康罗嘉豪熊江磊陈琳媛安庆
Owner CHINA ELECTRONICS INNOVATION ENVIRONMENTAL TECH CO LTD
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