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WHO standards for biogas construction of school toilet

Hi, I am a RedR member working in Haiti and we are working in Biogas construction connected to a school toilet. I would like to know if you could help me to find the WHO standards which we are using for waste water.

The biogas is producing gas and fertilizer ( slurry ) after 60 days of fermentation. I would like to do a test analysis of the slurry after the fermentation time to find which kind of microbe will still be there and what can be the consequences to the people who could use the slurry in agriculture.

Best regards Flory