Primary Study On Methane Emission From Domestic Wastewater

Climate change issue is the major problem which relevant to human survival and development, and all countries in the world is facing these serious challenges and should solve it together. The global warming caused by the increaseing in the concentration of greenhouse gases has a serious impact on the natural ecosystems and human living environment. Climate change is an environmental issue, and its essence is about political and economic issues, ultimately is a development issue. Therefore, the analysis and reveal the greenhouse gas emission sources and sinks is an essitial work for addressing climate change. In the IPCC Fourth Assessment report, the methane emissions from waste treatment is the third largest emissions source of methane in the world, and it is also an important renewable energy. The GHGs emissions form waste water treatment is a very important emissions source, including industrial wastewater, domestic and commercial wastewater. Therefore, the methane emission from domestic and commercial wastewater is very important part of national greenhouse gas inventories, and has an important role and significance for addressing climate change.In this paper, the mechanism of methane from domestic wastewater treatment and emissions was elaborated, the inter-annual variation and regional distribution of active data in China was discussed, based on" IPCC Good Practice Guidance and Uncertainty Management in National Greenhouse Gas Inventories" and "2006 IPCC Guidelines for National Greenhouse Gas Inventories", the inter-annual variation and regional distribution of CH4 emissions was analyzed, and methane emission from different sizes wastewater treatment plants were discussed.The results show that, (1) there was regional difference BOD/COD value, domestic wastewater emission was increasing year by year, domestic COD was gradually reducing, the domestic wastewater and COD emission trend declined from south to north and from east to west. Since 2000, domestic wastewater treatment system developed rapidly, and COD removal in the amount was sustainably growing. (2) Methane emission from domestic wastewater increased year by year.. Distribution trend was that, methane emission was decreasing from the overall economic development from the southeast coast, population density and water-rich areas to the northwest slow economic growth, sparse population and water scarcity areas. Domestic wastewater was major emission source of methane emission and recovery source.