Hello Amrit and Upendra,

Greetings from Samoa. I have some problems with the calculation or estimation of fecal output per person by you and the value quoted by Jacky from the Guidebook on biogas development (ESCAP, 1980). I will presume that fecal output is dependent on food digestibility which in turn is related to other intrinsic qualities of food, including level of intake, age, sex and other status.  In China I will estimate digestibility at 75% and higher food intake because of the low fibre diet of an average Chinese and therefore lower fecal output. However, the trend will be the reverse in the refuge camp, that is lower digestibility, moderate food intake, lower activity level and therefore higher fecal output.

What this means is that knowledge of food intake and approximate digestibility values will suffice to calculate fecal output for any community, the same extrapolation could be done for urinal output based on water intake etc. Today mankind has got so much access to information and knowledge that biological logic could be easily incorporated into any concept.

Have a nice day.

Asifo (Ph.D.)