Nguyen Lan Huong, Mohan Geetha, Jian Pu, Takemoto Kazuhiko, Fukushi Kensuke
Graduate Program in Sustainability Science-Global Leadership Initiative (GPSS-GLI), Graduate School of Frontier Sciences, The University of Tokyo, Chiba 277-8563, Japan.
Integrated Research System for Sustainability Science (IR3S), The University of Tokyo, Tokyo 113-8654, Japan.
ScientificWorldJournal. 2016;2016:6523217. doi: 10.1155/2016/6523217. Epub 2016 Sep 8.
Currently in many cities and rural areas of Vietnam, wastewater is discharged to the environment without any treatment, which emits considerable amount of greenhouse gas (GHG), particularly methane. In this study, four GHG emission scenarios were examined, as well as the baseline scenario, in order to verify the potential of GHG reduction from domestic wastewater with adequate treatment facilities. The ArcGIS and ArcHydro tools were employed to visualize and analyze GHG emissions resulting from discharge of untreated wastewater, in rural areas of Vu Gia Thu Bon river basin, Vietnam. By applying the current IPCC guidelines for GHG emissions, we found that a reduction of GHG emissions can be achieved through treatment of domestic wastewater in the studied area. Compared with baseline scenario, a maximum 16% of total GHG emissions can be reduced, in which 30% of households existing latrines are substituted by Japanese Johkasou technology and other 20% of domestic wastewater is treated by conventional activated sludge.
目前在越南的许多城市和农村地区，废水未经任何处理就排放到环境中，这会排放大量温室气体（GHG），尤其是甲烷。在本研究中，研究了四种温室气体排放情景以及基准情景，以验证具备适当处理设施的生活污水减少温室气体排放的潜力。利用ArcGIS和ArcHydro工具对越南武嘉秋盆河流域农村地区未经处理的废水排放所产生的温室气体排放进行可视化和分析。通过应用当前政府间气候变化专门委员会（IPCC）的温室气体排放指南，我们发现通过处理研究区域内的生活污水可以实现温室气体排放的减少。与基准情景相比，温室气体总排放量最多可减少16%，其中现有30%的家庭厕所被日本小型污水处理系统技术取代，另外20%的生活污水采用传统活性污泥法处理。
