CO2 Emission on the Process of Sewage Treatment during "11th Five-Year Plan" Period

China established a national level of principle pollutions emission that 10 percent reduction of SO₂ and COD discharges by priority projects, structural adjustment, and environmental management during the "11^th Five-Year plan" period. This paper focused on the induced effect to CO₂ emission on the process of urban sewage treatment. CO₂ emission related to two parts of treatment process: municipal wastewater treatment plant construction and operation. Energy consumption play an important role when calculate CO₂ emission on the process of urban sewage treatment construction and operation by using input-output model. It came up with that 30.95 tons CO₂ emission when reduce 1ton COD on average during the "11^th Five-Year plan" period.