Influence of Influent CN Ratio on N2O Release and Its Reduction Control in Sewage Biological Denitrification

Abstract

At present, the problem of eutrophication of water bodies is becoming more and more prominent, and
the technology of biological denitrification of sewage has been developed rapidly, but N20 will be
produced in this process. N20 is an important greenhouse gas. Its greenhouse effect is 310 times that of
CO:, and it continues to grow at a rate of 0.25% per year. It has an important impact on the global
environment and climate change. N20 can also deplete ozone, destroy the ozone layer, seriously affect
the natural ecosystem and threaten human survival. Studies have shown that biological denitrification of
sewage is an important man-made source of N20 release. It is of great significance to study the pollutant
removal effect and N20 release in the sewage biological denitrification system. Different sewage
treatment processes will cause different amounts of nitrous oxide emissions. Controlling the inflow
method is an effective way to reduce nitrous oxide emissions: at the same time, temperature, ammonia
oxidation rate, and dissolved oxygen concentration will all affect the amount of nitrous oxide. The
emissions of dinitrogen have a more obvious impact. It is possible to reduce the emission of nitrous
oxide and reduce the impact of nitrous oxide on the greenhouse effect by selecting the sewage treatment
process with less nitrous oxide emission and controlling the process operating parameters.