Treatment process for high-concentration ammonium-nitrogen waste water

Abstract

The invention discloses a treatment process for high-concentration ammonium-nitrogen waste water. The treatment process includes the following steps: (1), pre-treating the high-concentration ammonium-nitrogen waste water; (2), performing heat exchange treatment and densification heating treatment on the ammonium-nitrogen waste water after being pre-treated sequentially; (3), adopting stripping steam to perform steam stripping treatment on the ammonium-nitrogen waste water after densification heating to obtain ammonium-containing steam and deammoniated waste water; (4), subjecting part of the ammonium-containing steam to densification heating treatment of step (2), performing densification heating on the ammonium-nitrogen waste water after heat exchange treatment, condensing the other part of the ammonium-containing steam, enabling part of condensed liquid to flow back into steam stripping treatment of step (3), and taking the other part of the condensed liquid as a finished ammonia water product for storage. The treatment process is simple in step, small in equipment investment, high in ammonium-nitrogen removing efficiency and low in steam single consumption of ammonium-nitrogen waste water treatment, standard reaching emission can be realized through only one-time treatment by the treatment process, and the finished ammonia water product having economic value can be recycled.

Description

technical field [0001] The invention belongs to the technical field of ammonia-nitrogen wastewater treatment, and in particular relates to a treatment process for high-concentration ammonia-nitrogen wastewater. Background technique [0002] With the rapid development of my country's economy, the problem of water pollution is becoming more and more serious, and the pollution of ammonia nitrogen wastewater is becoming more and more serious. At present, chemical industry, metallurgy, petrochemical, pharmaceutical, food and other industries all produce a large amount of high-concentration ammonia nitrogen wastewater. The discharge of a large amount of ammonia nitrogen wastewater has led to intensified eutrophication of the water body, resulting in black and odorous water bodies and a large number of fish deaths. The resulting major water crises occur from time to time, seriously affecting people's normal life, and even endangering people's health, which has a huge social impact...

AI Technical Summary

Problems solved by technology

[0005] However, there are many technical problems in the steam stripping method, which limit its wide application in industry: On the one hand, the traditional steam stripping ammonia removal technology, for the ammonia nitrogen wastewater with a concentration of 3000-8000mg / L, after one treatment, The concentration of ammonia nitrogen is usually reduced to 100-300mg / L, which cannot meet the requirements of national emission standards; Wastewater), the concentration of ammonia water after treatment is generally about 5%, which cannot meet the concentration requirements of finished ammonia water, and has no economic value

In addition, the traditional steam stripping method usually uses plate towers or random packed towers, which have the problems of high tower body and easy fouling and blockage of tower equipment

These defects lead to large equipment investment and high operating costs when using the traditional steam stripping method, which makes enterprises unwilling or unable to bear the processing costs

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