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Hi Sanjay,

even though the idea of re-utilization of human excrement is not (or seems to be) part of what you are looking for, I think the concept is worth a consideration. It reduces the need of handling, transportation and disposal:

https://www.agroecology.org/Case%20Studies/humanmanure.html

An additional thought is the Arborloo latrine.

https://www.ecosanres.org/pdf_files/PM_Report/Appendix1_The_Arborloo_book_a.pdf

Human excrement as compost is not a common idea and often frowned upon by communities but it does have great benefits. Particularly making use of a resource that people generally spend way too much money and effort disposing of when it can be a great asset.

'nando