Faecal Sludge that is removed can be transported to a dedicated faecal Sludge treatment facility (T.13-T.17)([[Sedimentation - Thickening Ponds]], [[Unplanted Drying Beds]], [[Planted Drying Beds]], [[Co-composting]], [[Anaerobic Biogas Reactor]]).
In the event that the treatment facility is not easily accessible, the faecal Sludge can be discharged to a [[Transfer Station (- Underground Holding Tank)|Transfer Station]] (C.7).From there, it will be transported to the treatment facility by a motorized vehicle (C.3). A technology selection tree for faecal Sludge treatment plants is provided in Strande et al., 2014 (see Sector Development Tools, p. 9). (Semi-) Centralized Treatment technologies (T.1-T.17) produce both Effluent and Sludge, which may require further treatment prior to Use and/or Disposal. For example, Effluent from a faecal Sludge treatment facility could be co-treated with wastewater in [[Waste Stabilization Pond | Waste Stabilization Ponds]] (T.5) or Constructed Wetlands (T.7-T.9) such as a [[Free-Water Surface Constructed Wetland]], a [[Horizontal Subsurface Flow Constructed Wetland]], or a [[Vertical Flow Constructed Wetland]].
From the Transfer Station the Faecal Sludge must be transported to a dedicated Faecal Sludge treatment facility ([[Sedimentation - Thickening Ponds]], [[Unplanted Drying Beds]], [[Planted Drying Beds]], [[Co-composting]], [[Anaerobic Biogas Reactor]])) by a [[Motorized Emptying and Transport|motorized vehicle]].
All (Semi-) Centralized Treatment Technologies produce both Effluent and faecal Sludge, which require further treatment prior to Use and/or Disposal. Technologies for the Use and/or Disposal of the treated Effluent include [[Irrigation]], [[Aquaculture Ponds]], [[Floating Plant (- Macrophyte) - Pond|Macrophyte Pond]] or [[Water Disposal - Groundwater Recharge|Discharge to a water body or Recharge to groundwater]]. After adequate
treatment, Sludge can either be used in agriculture (D.5) or brought to a Storage/Disposal site (D.12).
===Considerations===
This system should be chosen only where there is either enough space to continuously dig new pits or when there is an appropriate way to empty, treat and dispose of the faecal Sludge. In dense urban settlements, there may not be sufficient space to access a pit for desludging or to make a new pit. This system is, therefore, best suited to rural and peri-urban areas where the soil is appropriate for digging pits and absorbing the leachate. It is not recommended for areas prone to heavy rains or flooding, which may cause pits to overflow.
when digging pits in order to avoid contaminating it. Although different types of pits are common in most parts of the world, a well-designed pit-based system with appropriate transport, treatment and use or disposal is rare.
[[Functional Groups|More on the Functional Groups: U, S, C, T, or D]]<br>
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