Method and system for deep denitrification of sewage

Abstract

The invention relates to the field of water treatment, in particular to a method and system for deep denitrification of sewage. The method includes the following steps: 1) subjecting the water body to be treated by membrane-based microorganisms; 2) under the catalytic action of nano-metals and hydrogen supported on the carrier membrane, reducing nitrous nitrogen in the water body obtained from the membrane-based microbial treatment to nitrogen gas . The system includes: a first membrane reaction zone for treating water body to be treated with membrane-based microorganisms, and a first membrane assembly is arranged in the first membrane reaction zone; microorganisms are attached to the membrane in the first membrane assembly; A second membrane reaction zone in which nitrous nitrogen in the treated water body is reduced to nitrogen, a second membrane assembly is arranged in the second membrane reaction zone; nano-metals are attached to the membrane in the second membrane assembly; the second membrane reaction zone reacts with the first membrane zone is in fluid communication. The invention realizes short-range nitrification and denitrification, so that the total nitrogen pollutant removal rate of the treated sewage reaches 95%, and the discharge standard of quasi-four types of water is reached.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method and system for deep denitrification of sewage, which couples microbial metabolism and nano-catalysis to realize deep denitrification of sewage. Background technique [0002] With the rapid development of my country's economy, the problem of water pollution is becoming more and more serious. In 2018, the total amount of sewage produced in my country has exceeded 70 billion tons, of which domestic sewage accounts for more than 70%, becoming the main source of sewage. Domestic sewage is often rich in nitrogen pollutants and phosphorus pollutants. If the discharge does not meet the standards, it will cause eutrophication of natural water bodies. In 2015, the total amount of ammonia nitrogen discharged from urban domestic sewage in my country reached 1.341 million tons, accounting for 60% of the total discharge of all types of sewage. Therefore, denitrification is still a maj...

AI Technical Summary

Problems solved by technology

This kind of traditional biological treatment technology is mature and easy to operate, but it often faces the problem of unstable denitrification process and limited deep denitrification capacity

In particular, my country's sewage treatment plants often face the problem of low COD in sewage. Since the denitrification process needs to consume carbon sources, when the sewage itself has insufficient carbon sources, it is necessary to add additional carbon sources. Additional carbon sources will not only increase treatment costs, but also bring The risk of effluent COD exceeding the standard

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