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WHO has a range of useful publications. The one I know best is a bit old "Guidelines for the safe use of wastewater and excreta in agriculture and aquaculture" https://apps.who.int/iris/bitstream/10665/41681/1/9241542489.pdf but I see they also have SANITATION SAFETY PLANNING,MANUAL FOR SAFE USE AND DISPOSAL OF WASTEWATER,GREYWATER AND EXCRETA downloadable at https://apps.who.int/iris/bitstream/10665/171753/1/9789241549240_eng.pdf?ua=1 which is more recent. Suggest browsing their publications to see what is most appropriate to your needs.