A pilot scale experiment of ozone/activated carbon/denitrifying biofilter was conducted for biological nitrogen removal from the secondary treatment effluent of Jiuxianqiao WWTP.

Aimed at a wastewater treatment project in the north of Zhejiang Province,the pilot study was conducted for nitrogen and phosphorus removal from municipal wastewater by submerged pre-denitrification filter/submerged aerobic filter/deep bed Denite filter.

Based on the biology, offers to use the biological methods such as biological nitrification-antidigesting reaction, planting the water plant in natural water bodies, sewage irrigation, lagoon and so on, to get rid of N, P in water bodies, thus to avoid the appearance of eutrophication of water bodies.

In the paper,biological denitrification,selection of electron donor and reactor in the treatment of drinking water and their application were introduced.

It was shown that the biological denitrification process with cotton and paper as carbon source and reaction media could remove nitrate from the underground water successfully,but that with rice straw and wood flour as carbon source and reaction media had poorer effect;pH values in the effluent of four reactors had smaller chang.

The carbon source satisfied with biological denitrification process.