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The first stop for information about sanitation I think should be Duncan Mara's website: https://www.personal.leeds.ac.uk/~cen6ddm/
SANDEC also have a number of useful publications: https://www.eawag.ch/en/department/sandec/
As do the IWA: https://www.iwawaterwiki.org/xwiki/bin/view/Articles/DevelopingCountriesTitlesfromIWAPublishingFreetoDownload
https://bookboon.com/en have a number or free to download textbooks that may also be of interest.