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Although not specifically for emergencies the technical brief at https://www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-htm/lcsahgt.htm may be of interest.
I expect that you are aware of https://wedc.lboro.ac.uk/publications/details.php?book=1%2084380%20005%205&keyword=%sanitation%&subject=0&sort=TITLE and https://wedc.lboro.ac.uk/publications/details.php?book=978%201%2084380%20113%209&keyword=%excreta%&subject=1&sort=AUTHOR_EDITOR which may have some advice.
Brian