System Template 7
This system is characterized by the use of a household-level technology to remove and digest settleable solids from the Blackwater, and a Simplified or Solids-Free Sewer system to transport the Effluent to a (Semi-) Centralized Treatment facility. Inputs to the system can include Faeces, Urine, Flushwater, Anal Cleansing Water, Dry Cleansing Materials and Greywater.
This system is especially appropriate for urban settlements where the soil is not suitable for the infiltration of Effluent. Since the sewer network is shallow and (ideally) watertight, it is also applicable for areas with high groundwater tables.