Method for removing nitrate of surface water

Abstract

The invention relates to a method for removing nitrate of surface water, which organically combines a biofilter and an ecological gravel bed. In the biofilter, light ceramic particles are adopted as a filtering medium and used for attaching and growing denitrification microorganisms. Commercial methanol solution is added into inlet water of the biofilter to supplement a carbon source needed for denitrification; after the denitrification reaction is finished, outlet water of the biofilter enters the ecological gravel bed; gravel, zeolite and other natural filtering media are filled in the gravel bed; residual organisms in the outlet water of the biofilter is degraded through biological function; meanwhile, little ammonia and nitrogen contained in the inlet water is adsorbed through the physical adsorption of the natural zeolite; and purified water flows into a surface water body of a lake. The method can rapidly and efficiently remove the nitrate in the surface water body, improve the quality of water after being treated and reduce the probability of occurrence of algal blooms of the water body of a receiving lake.

Description

technical field [0001] The invention relates to a method for removing nitrate from surface water. By combining a biological filter with an ecological gravel bed process, the removal of nitrate from surface water can be realized, the environmental quality of surface water can be improved, and algae in the surface water can be reduced. The probability of Hua happening. The invention belongs to the technical field of environmental engineering micropollution water treatment. Background technique [0002] Most cities in my country have surface landscape water bodies of various sizes. Many of these water bodies have become a city's historical and cultural symbols and integrated into an inseparable part of urban culture. For example, West Lake, as a historical and cultural symbol of Hangzhou, has become a model of urban landscape lakes in my country. However, due to the rapid development of social economy and other reasons, most of my country's urban landscape lakes are facing t...

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, in the pretreatment process of nitrogen-contaminated surface raw water, biological aerated filter or biological contact oxidation process is often used to convert ammonia nitrogen into nitrate nitrogen through nitrification process, but the content of total nitrogen in the treated water has not been effectively reduced.

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