Low cost wastewater treatment for the world
Before you read on, consider the level of treatment you require and whether only primary treatment of the effluent is required (removal of solids followed by disposal to soak pit or soakage trenches) or whether secondary treatment is required (to produce high quality effluent for surface irrigation). See the How it works page and the System types page.
These Construction pages provide advice for building a domestic system that irrigates domestic wastewater to the soil surface for feeding the soil and growing plants.
Below is a diagram of a full tertiary treatment domestic wastewater treatment system. This includes a primary digester, a secondary vermifilter, a tertiary treatment vermifilter and a pumpout tank:
See the video below of a working tertiary treatment system: