Method for recovering waste water from sodium dichloroisocyanurate production

Abstract

The invention provides a method for recovering waste water from sodium dichloroisocyanurate production, which comprises the following steps: waste water from sodium dichloroisocyanurate production is added with hydrochloric acid for acidifying, then chlorine in the waste water is blown out, active carbon fiber adsorbs cyanuric acid, alkali regenerates active carbon fiber and recovers sodium cyanurate, sodium cyanurate is sent to the sodium dichloroisocyanurate production process, brine is sent to chlor-alkali production process. waste water is subjected to the adsorption treatment, and can be salt-dissolving water in the chlor-alkali production operation for repetitive usage. The active carbon fiber is capable of being regenerated multiple times, the repetitive usage is realized, the cost is low, the method process is simple and the industrial method is easy to realize.

Description

Technical field [0001] The invention relates to a method for recovering wastewater from the production of sodium dichloroisocyanurate. Background technique [0002] Sodium dichloroisocyanurate is a product of chlor-alkali companies and is a broad-spectrum, high-efficiency, low-toxicity organic chlorine disinfectant with a wide range of uses. The product can slowly release hypochlorous acid when sprayed on the surface of crops, which can cause the pathogenic bacteria to die quickly by denaturing the bacterial protein, changing the membrane permeability, interfering with the physiological and biochemical processes of the enzyme system and affecting DNA synthesis. This product has the advantages of fast dissolution, good sterilization performance, weak acid pH, low irritation, low toxicity, and stable storage. It has been developed rapidly in recent years. The United States Federal Food and Drug Administration (FDA) and Environmental Protection Agency (EPA) ) Has been formally appr...

AI Technical Summary

Problems solved by technology

Due to the high nitrogen content, the total nitrogen content of these waste water is about 600mg / L, so it cannot be reused as salt water (salt water has high requirements for ammonia nitrogen: inorganic ammonia ≤ 1mg / L; total ammonia nitrogen ≤ 4mg / L); if directly On the one hand, a large amount of process water is wasted. On the other hand, because the wastewater contains cyanuric acid, sodium dichloroisocyanurate, organic chlorine and other components, the content of organic carbon and ammonia nitrogen far exceeds the national discharge standard, so it cannot direct discharge, must be treated

The existing treatment methods include concentrated evaporation, crystallization, decomposition, adsorption and other processes, but the investment and operation costs are very high

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