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Method and system for treating high-salt degradation-resistant wastewater

A technology for wastewater treatment and refractory degradation, applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc. The effect of reducing energy consumption

Pending Publication Date: 2022-05-10
河北奥思德环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method and system for treating high-salt refractory wastewater, which solves the problems of secondary pollution and high energy consumption in the existing common technologies

Method used

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  • Method and system for treating high-salt degradation-resistant wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0057] A chemical company has high-salt wastewater containing sodium chloride and sodium sulfate, with a total salt content of 1% to 2%, COD500mg / L or so, and the water body is light yellow.

[0058] S1. Filtration to remove impurities, the waste water is passed through a plate filter to filter out particulate matter and suspended matter. S2. After the first-stage wet catalytic oxidation treatment of the wastewater, the COD can be reduced to below 50mg / L or even below 10mg / L (realized by adjusting the amount of oxidant), and the treated effluent is clear and colorless. S3. After softening and removing hardness, flocculation and precipitation, Ca 2+ , Mg 2+ Plasma content can be reduced to below 50mg / L. S4. The high salt water is initially filtered through the ultrafiltration system. S5. In the first stage of reverse osmosis, the purified water produced reaches the reuse standard for reuse. After the first stage of reverse osmosis concentration, the concentrated water COD re...

Embodiment 2

[0060] A coking enterprise has wastewater containing sodium chloride, the salt content is about 2%, the COD is about 1800mg / L, and the water body is orange-yellow.

[0061] S1. Filtration to remove impurities, the waste water is passed through a plate filter to filter out particulate matter and suspended matter. S2. After the waste water is treated by wet catalytic oxidation in the first stage, the COD can be reduced to below 50 mg / L, and the effluent after treatment is basically colorless. S3. After softening and removing hardness, flocculation and precipitation, Ca 2+ , Mg 2+ Plasma content can be reduced to below 50mg / L. S4. The high salt water is initially filtered through the ultrafiltration system. S5. In the first stage of reverse osmosis, the purified water produced reaches the reuse standard for reuse. After the first stage of reverse osmosis concentration, the concentrated water COD reaches about 200mg / L, and the salt content is greater than 6%. Enter S6. The seco...

Embodiment 3

[0063] A certain enterprise has wastewater containing sodium chloride, the salt content is about 1.5%, the COD is about 1000mg / L, and the water body is yellow.

[0064] S1. Filtration to remove impurities, the waste water is passed through a plate filter to filter out particulate matter and suspended matter. S2. After the waste water is treated by wet catalytic oxidation in the first stage, the COD can be reduced to about 40mg / L, and the effluent after treatment is clear and colorless. S3. After softening and removing hardness, flocculation and precipitation, Ca 2+ , Mg 2+ Plasma content can be reduced to below 50mg / L. S4. The high salt water is initially filtered through the ultrafiltration system. S5. In the first stage of reverse osmosis, the purified water produced reaches the reuse standard for reuse. After the first stage of reverse osmosis concentration, the concentrated water COD reaches about 200mg / L, and the salt content is about 5%. Enter S6. The second stage We...

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Abstract

The invention provides a method and a system for treating high-salt degradation-resistant wastewater, and relates to the technical field of wastewater treatment. The method is used for treating high-salt degradation-resistant wastewater into recyclable water, and comprises the steps of filtration and impurity removal, first-stage wet catalytic oxidation, softening, ultrafiltration, first-stage reverse osmosis, second-stage wet catalytic oxidation, second-stage reverse osmosis, post-treatment and the like. According to the method, organic pollutants are efficiently degraded through an LDO advanced oxidation technology, secondary pollution is not generated, the problems that secondary pollution is generated and operation is unstable in a conventional oxidation technology are effectively solved, and the problem that energy consumption of a common reverse osmosis system is high is effectively solved through an energy recovery device, system kinetic energy is recovered and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method and system for treating high-salt refractory wastewater. Background technique [0002] At this stage, the main technologies used for the treatment of high-salt refractory wastewater include advanced oxidation + membrane concentration or advanced oxidation + evaporation crystallization. Advanced oxidation technology often uses Fenton oxidation. Iron is used as a flocculant, and flocculation will produce a large amount of "iron slime" precipitation. Since the precipitation contains a large amount of pollutants, it is generally treated as hazardous waste, which is costly. [0003] At the present stage, the combined application of reverse osmosis + nanofiltration + electrodialysis is commonly used in the membrane concentration of high-salt wastewater to realize the resource utilization of wastewater. In the evaporation technology, the mother liquor produced dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/66C02F1/56C02F1/52C02F1/44C02F5/02
CPCC02F9/00C02F1/001C02F1/725C02F1/722C02F1/66C02F1/5236C02F1/56C02F1/444C02F1/441C02F5/02C02F2301/08C02F2209/08
Inventor 赵少欣吴海鸥纪运广李洪涛杨玉淮张少兵
Owner 河北奥思德环保科技有限公司
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