What kind of technology has better nitrogen removal effect?

In view of the present situation of water pollution, the source of nitrogen and its main hazards are briefly introduced, and the reaction principles, advantages and disadvantages of physical and chemical denitrification and biological denitrification are briefly compared. Biological denitrification is widely used because of its low cost, simple operation, good treatment effect and no secondary pollution. On this basis, several biological denitrification processes widely used at home and abroad are introduced, and finally the development trend of wastewater denitrification is briefly explained.