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Reverse osmosis electrodialysis method for treating saline wastewater

A technology for saline wastewater and reverse osmosis concentrated water, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. Problems such as rupture, pressure cannot increase indefinitely, etc.

Active Publication Date: 2022-02-22
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Description
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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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  • Reverse osmosis electrodialysis method for treating saline wastewater

Examples

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Comparison scheme
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

The invention belongs to the field of chemical wastewater treatment, and relates to a method for treating saline wastewater, in particular to a method for treating saline wastewater by reverse osmosis electrodialysis, comprising two steps of reverse osmosis and electrodialysis, and performing reverse osmosis treatment on the pretreated pesticide wastewater Reverse osmosis concentrated water is obtained; the reverse osmosis concentrated water is subjected to cyclic electrodialysis treatment until the conductivity of the electrodialysis concentrated water is greater than or equal to the set threshold value, and high brine is obtained. This method combines reverse osmosis and electrodialysis to fully enrich and concentrate the salt substances in the pesticide wastewater, and realizes the recovery of the salt substances in the pesticide wastewater. The technical solution can be applied to the treatment of pesticide waste water and the like, so as to realize zero pollution discharge 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 Patents(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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