Changes

A composting chamber can be designed in various configurations and constructed above or below ground, indoors or with a separate superstructure. A design value of 300 L/person/year can be used to calculate the required chamber volume. Ventilation channels (air ducts) under the heap can be beneficial for aeration. More complex designs can include a small ventilation fan, a mechanical mixer, or multiple compartments to allow for increased storage and degradation time. A sloped bottom and a chamber for compost withdrawal facilitate access to the final product. A drainage system is important to ensure the removal of leachate. Excessive ammonia from urine inhibits the microbial processes in the chamber. The use of a [[Urine Diverting Dry Toilet | Urine-Diverting Dry Toilet]] (UDDT, U.2) or [[Urinal | Urinal]] (U.3) can, therefore, improve the quality of the compost.