Treatment Technology of High Concentration Ammonia Nitrogen Wastewater

Abstract

The invention discloses a treatment process for high-concentration ammonia-nitrogen wastewater, which comprises the following steps: (1) pretreating high-concentration ammonia-nitrogen wastewater; (2) treating the pretreated ammonia-nitrogen wastewater by heat exchange and then increasing concentration and temperature (3) Using stripping steam to strip the concentrated and heated ammonia-nitrogen wastewater to obtain ammonia-containing steam and deammonized wastewater; (4) Send the ammonia-containing steam part to the concentration and temperature-increasing treatment of step (2) , to increase the concentration and temperature of the ammonia-nitrogen waste water after the heat exchange treatment, condense another part of the ammonia-containing steam, and part of the obtained condensate is refluxed to the stripping treatment in step (3), and the other part of the condensate is stored as the finished product of ammonia water . The treatment process of the present invention has simple steps, less equipment investment, high ammonia nitrogen removal efficiency, low steam unit consumption for ammonia nitrogen wastewater treatment, can achieve standard discharge after one treatment, and can recycle finished ammonia water with economic value.

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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