Wastewater treatment process of caustic soda device in chemical industry

Abstract

The invention discloses a wastewater treatment process of a caustic soda device in the chemical industry. A simple, practical and economical wastewater treatment scheme is established by adopting a method of reducing emission and grading before treatment for backwashing and regenerating wastewater from an electrolytic resin tower, dilute brine from an electrolytic outlet tank, primary brine refining wastewater, chlorine and hydrogen treatment washing liquid, evaporation liquid, frozen condensate, other unorganized discharge water and sewage discharged from a circulating water device, and the wastewater treatment process is reasonable and scientific to achieve the purpose of comprehensively purifying wastewater.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a waste water treatment process of a caustic soda plant in the chemical industry. Background technique [0002] In recent years, the rapid development of my country's chlor-alkali industry has also brought about environmental problems. Among them, the waste water generated in the production process of caustic soda equipment will have a great impact on the environment if it is directly discharged. Strictly speaking, enterprises are also actively thinking of ways to invest more and more in wastewater treatment every year. How to turn waste into treasure and pay attention to water conservation while protecting the environment is a research topic. [0003] Modern wastewater treatment technologies can be divided into chemical methods, physical methods and biological methods according to their working principles. (1) Chemical treatment methods include neutrali...

AI Technical Summary

Problems solved by technology

As far as caustic soda production enterprises are concerned, it includes primary brine, secondary brine and electrolysis, hydrogen chloride treatment, hydrogen chloride synthesis, liquid chlorine, finished product tank farm, water freezing, circulating water and other processes, which will produce various sewage, so investing in sewage The treatment device collects all the water for treatment and reuse. On the one hand, the investment is relatively large, and the treatment method is complicated, which is obviously unreasonable and needs to be improved.