The concept of biochemical treatment is relative to ecological treatment. Biochemical treatment usually consists of two important elements:
　　1. A large amount of aeration in the water to supply oxygen to support the survival of microorganisms.
　　2. Use microorganisms to decompose organic matter in sewage to purify sewage. Biochemical treatment is the core of most traditional wastewater treatment processes. Most municipal wastewater treatment plants in China use biochemical treatment technology.
　　Let us act, a warm world!