This US Webinar is on decentralized waste water system designs. It briefly describes the waste water characterization, primary treatment, soil based treatment and distribution design for soil dispersal.
D’AMATO, V. FRANKENBERGER, J. (2010): Decentralized Wastewater Treatment Systems: Processes, Design, Management, and Use. Conservation Technology Information Center (CTIC), Environmental Protection Agency (EPA), Tetra Tech URL [Accessed: 20.03.2014]