The principle of simultaneous nitrification and denitrification and factors affecting it are given,such as carbon source,DO,the property of activated sludge ect.

• 并对反硝化除磷、同时硝化与反硝化、短程硝化反硝化、厌氧氨氧化等生物脱氮除磷新技术的相关工艺及其特点进行了评述。