Treatment method for salt-containing wastewater

Abstract

The invention relates to a treatment device and a treatment method for salt-containing wastewater. The treatment device comprises a pump, a cooling and water-washing tower, an oxidation and flocculation pool, a precipitation pool, and a filter, wherein the salt-containing wastewater enters in the cooling and water-washing tower of a wet-method flue gas desulfurization device and adequately contacts with sulphur dioxide-containing flue gas to react at first, and then is subjected to the subsequent treatments of oxidation, flocculation, neutralization, precipitation, filter and the like; the treated wastewater can be used as replenishing water for circulation water or be discharged up to the standards. Compared with the prior art, the method disclosed by the invention is wider in sewage application range, as well as capable of effectively reducing the hardness, COD (chemical oxygen demand) and turbidity of the salt-containing wastewater, reducing industrial water, increasing the utilization rate of the industrial water, and achieving the effects of saving water and reducing discharge.

Description

technical field [0001] The invention relates to a treatment method for saline wastewater, in particular to a treatment method for saline wastewater such as reverse osmosis concentrated water and circulating water drainage. Background technique [0002] my country is one of the countries with severe shortage of water resources. With the development of industrialization, the serious shortage of water resources and the deterioration of water environment have become important factors restricting the development of my country's economy and society. With the in-depth development of "water saving and emission reduction", the rational use of sewage by using sewage reuse technology can not only save a lot of water resources, but also greatly reduce the discharge of sewage, which is of great significance to the sustainable development of the economy. [0003] In industrial enterprises, some users who have high requirements for salt in water often use electrodialysis, reverse osmosis, ...

AI Technical Summary

Problems solved by technology

However, these methods have disadvantages: the antiscalant and bactericide added to the concentrated water before the reverse osmosis treatment can inhibit the biochemical system; the conventional physical and chemical methods such as flocculation and filtration have unsatisfactory effects; Distillation only separates and transfers pollutants from water, but does not really remove pollutants; activated carbon adsorption treatment is costly and economically unfeasible

The disadvantage is that the added catalyst contains a large amount of metal ions, and because the pH value required by the oxidation reaction is low, it may cause the dissolution of heavy metal ions and form secondary pollution; in addition, the addition of oxidants and catalysts greatly improves sewage treatment. the cost of

The disadvantages are: no removal effect on the salt content in wastewater; no catalyst involved in the oxidation process, the efficiency is greatly reduced, the amount of oxidant is large, and the treatment cost increases

Due to the low desulfurization efficiency of the circular semi-dry method and the large amount of solid waste generated, it is difficult to meet the increasingly stringent environmental protection requirements, and the application is less and less

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