A model system for participatory communal waste water treatment system was developed in densely populated area of Yogyakarta special province. After the community member's awareness for sanitation and motivation for the system was developed, affordable technology was carefully selected. As the community member's income was low and the available space for the system was very limited, rotating biological contactors with three dimensional lattice media was selected. The technology was also characterized with easiness of operation. After short training of operation and maintenance, the system has been continuously operated by community members with their own expense.

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