ISO IWA 28

Description / Abstract: This document specifies requirements and test methods to ensure safety, performance and sustainability of community-scale resource-oriented faecal sludge treatment units that serve approximately 1 000 to 100 000 people. This document applies to treatment units that:

a) primarily treat faecal sludge;

b) are able to operate in non-sewered and off-grid environments;

c) are prefabricated.

This document does not apply to sanitation treatment units requiring sewer infrastructure, or to those requiring electric grid access during steady state operation.

Treatment units to which this document applies exhibit resource recovery capability (e.g. recovering energy, reusable water, soil amendment) and are capable of being energy neutral or energy net positive.