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Most of the sanitation options used are on-site dry or those that use limited quantities of water (pour flush). There don’t tend to be the interconnected sewerage networks that you need to accumulate large quantities of wastewater so we tend to focus on faecal sludge management rather than wastewater management per se but there are exceptions. Orangi Pilot Project in Pakistan is one. There are also examples of decentralised wastewater treatment facilities in Nepal.

On the wastewater reuse front we have got a small number of programmes in Nepal who use wastewater from washing utensils for watering of kitchen gardens. The approach makes use of a natural gradient in these communities. There may be other larger scale examples that form part of urban programming.

I’m copying in Ada, Timeyin and Remi who will know more than I do about this.