Abstract
Decentralized and separated waste water treatment system (DSWWTS) is a new proposed system that consists of a non-flushing toilet (composting toilet) which converts excreta into fertilizer and some compositional units such as slant soil treatment system for grey water including wastewater from kitchen, bath and cleaning. According to environmental assessment, the pollution loads such as BOD, T-N and T-P were estimated to be significantly reduced comparing with conventional sewage system or GAPPEI-JOUKASOU system. Life Cycle Assessment (LCA) method was also used to assess the energy consumption as environmental load in terms of construction stage to operation stage. As a result, the energy required for DSWWTS was estimated to be smaller than those for two conventional systems.
