Abstract: The treatment process of domestic wastewater and industry wastewater is one of strong CH₄ sources in waste treatment. According to the statistic data, IPCC model, and China local special emission factors, the characteristics of CH₄ emissions from the wastewater treatment process were predicted analyzed. The driven factors of the CH₄ emissions were also analyzed. And CH₄ emission trend and potential were predicted and analyzed according to the current situations of China wastewater treatment. The results show that CH₄ emissions from the treatments of domestic wastewater and industry wastewater is 611.0 thousand and 1623.7 thousand t respectively in 2010. Of which, CH₄ emissions of the eight major industries, accounting for more than 92%. And the emission increased gradually from 2005 to 2010. If the scenario is under the controlling management in 2020, the CH₄ emissions from the treatments of domestic wastewater and industry wastewater will be 1.0136 and 2.3393 million t, respectively. The emission reductions potential will be respectively 0.0763 and 0.2599 million t, the CH₄ emission from the treatments of domestic wastewater and industry wastewater will increase by 66% and 44% respectively relative to 2010.

Key words: domestic wastewater, industry wastewater, CH₄ emissions, emission reductions potential