Method for depriving nitrogen nutritive salt in surface water

Abstract

The invention relates to a method for depriving nitrogen nutritive salt in surface water. In a biofilter, natural zeolite is taken as filter medium for apposition growth of denitrifying microorganism. Commercial ethanol solution is thrown in influent water of the biofilter to supplement carbon source needed by denitrification, at the same time when the denitrification reaction is ended, the small amount of ammonia nitrogen contained in the influent water is absorbed by the physical absorption action of the natural zeolite filter medium and the purified water flows into surface water bodies such as lakes. In the invention, nitrate denitrification and ammonia nitrogen absorption are combined to fast and efficiently remove ammonia nitrogen and nitrate in surface water, improve the quality of treated water, and lower probability of occurrence of algal bloom in receptive lake water bodies.

Description

technical field [0001] The invention relates to a method for removing nitrogenous nutrient salts in surface water, in particular to a method for removing nitrogenous nutrient salts in surface water by using a zeolite type biological filter. The invention belongs to the technical field of micro-polluted surface water treatment of environmental engineering. Background technique [0002] Most of the urban landscape lakes in my country are facing the serious situation of water pollution and lake eutrophication. From East Lake in Wuhan, Xuanwu Lake in Nanjing, West Lake in Huizhou, Slender West Lake in Yangzhou, Bayi Lake in Nanchang, Jianhu Lake in Shaoxing, to South Lake in Changchun, Hongfeng Lake in Guizhou and a series of urban lakes, the ministry is planning or implementing lake water pollution control and enrichment. Nutrientization Control Engineering. Treatment measures include sediment dredging, water flushing and ecological restoration. Water diversion, as an import...

AI Technical Summary

Problems solved by technology

However, the quality of surface water is very different from that of sewage, and the content of organic matter is very low, which does not meet the basic conditions for biological denitrification.

At present, ecological technology is generally used for denitrification treatment of slightly polluted surface raw water. However, the efficiency of ecological technology is low and the area is large. Large-scale engineering application in landscape lake areas with very limited land conditions is not realistic.

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