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Method for treatment of salt-containing wastewater by forward osmosis membrane distillation

A technology for salty wastewater and reverse osmosis concentrated water, which is applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Substance concentration, pressure cannot be increased indefinitely, etc., to achieve the effect of reducing content, reducing impurities and improving quality

Active Publication Date: 2019-12-31
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reverse osmosis method has the following disadvantages: because the pressure applied to the raw water side cannot be increased infinitely (too high pressure may cause adverse consequences such as semi-permeable membrane rupture), resulting in the inability to fully concentrate the salts in the raw water, resulting in The concentration of the salt solution cannot meet the requirements of subsequent processing

Method used

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  • Method for treatment of salt-containing wastewater by forward osmosis membrane distillation
  • Method for treatment of salt-containing wastewater by forward osmosis membrane distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 1. Characteristics of pesticide wastewater

[0038]This technical solution concentrates and recovers the salt substances of the pesticide wastewater. In this example, the pesticide wastewater is formed after conventional treatment to remove suspended solids. The characteristic parameters of the water quality are as follows: pH 8.0, COD 30933mg / L, conductivity 3891μs / cm, total phosphorus 897mg / L, NH 3 -N 108mg / L. The salt substances in the pesticide wastewater are mainly sodium chloride and sodium sulfate, and the content of the salt substances is 1.9w.t%.

[0039] Among them, COD is the abbreviation of Chemical Oxygen Demand, which refers to chemical oxygen demand, which refers to the amount of oxidant consumed when treating water samples with strong oxidants. It is an index indicating the amount of reducing substances in water. The reducing substances in water mainly refer to organic matter. COD is an indicator to measure the content of organic matter in water, NH ...

Embodiment 2

[0051] This example is basically the same as Example 1, except that the dosage ratio of anti-blocking agent and supernatant is 5mg:1L.

Embodiment 3

[0053] This example is basically the same as Example 1, except that the dosage ratio of anti-blocking agent and supernatant is 10mg:1L.

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Abstract

Belonging to the field of chemical wastewater treatment, the invention relates to a method for treatment of salt-containing wastewater, in particular to a method for treatment of salt-containing wastewater by forward osmosis electrodialysis. The method includes the two steps of reverse osmosis and electrodialysis, specifically, pretreated pesticide wastewater is subjected to reverse osmosis treatment to obtain reverse osmosis concentrated water; and the reverse osmosis concentrated water is subjected to circulating electrodialysis treatment until the electrical conductivity of the electrodialysis concentrated water is greater than or equal to a set threshold value, thus obtaining high-salinity water. The method provided by the invention combines reverse osmosis and electrodialysis for fullenrichment and concentration of salt substances in pesticide wastewater, and realizes recovery of salt substances in the pesticide wastewater. The technical scheme provided by the invention can be applied to treatment of pesticide wastewater and the like so as to realize zero-pollution emission and resource recycling.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and relates to a method for treating medium-concentration saline wastewater, in particular to a method for reverse osmosis electrodialysis treatment of saline wastewater. Background technique [0002] The composition of wastewater produced in the process of pesticide production is relatively complex, including production raw materials, by-products, intermediate products and a large amount of salt substances. Industrial waste. If the salt substances in pesticide wastewater are discharged directly without desalination, it will cause great harm to the water quality of the receiving water body, and even cause secondary salinization. However, the salt itself can be recycled as a renewable resource, so the enrichment treatment and recovery of the salt in the pesticide wastewater is of great significance to environmental protection and resource regeneration. [0003] Reverse osmosis (RO) r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/30
CPCC02F1/441C02F1/4693C02F2101/30C02F2101/306
Inventor 阳杨倾彩霞林辉荣毛小英何睿鸣令狐磊
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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