If methane provided from anaerobic digestion of food waste is used for energy, how many pounds of food waste would a family of 5 people have to generate per day to provide this energy to heat water (lb/day)? The United Nations states that the minimum potable water requirement to provide drinking water, sanitation, and hygiene is 20 L per person per day. Assume the water has an initial temperature of 25C and you must raise the temperature to 100C to produce potable water. The energy required to raise water up 1 C is equal to 4,200 J/L-C and there is 39 MJ of energy per m of methane. Assume that 1 metric ton of food waste produces 600 m of total gas and digester gas is approximately 60 percent methane