Food waste contains 60% moisture. Based on elemental composition analysis (organic dry matter basis), its molecular formula could be expressed as C5H1003No.5S0.05. The theoretical CH4 and CO2 contents after digestion could be estimated using the Buswell equation as shown: - CcHhON,Ss + 1/4(40 - h - 20 +3n + 2s)H20 1/8(4C - h + 20 +3n + 2s)CO2 + 1/8(4C + h - 20 -3n - 2s)CH4 + nNH3 + SH2S) Organic dry matter of the food waste is 30%, in which 80% is biodegradable. i) ii) Calculate how much methane (litres) is produced from per ton food waste (3 marks) When a Combined Heat and Power (CHP) unit with an electrical efficiency of 35% is used, how much electricity could be generated from each ton of food waste? (1 mark) If the heat recovery efficiency from CHP is 45%, is the heat recovered sufficient to heat the food waste from ambient temperature at 10 C to 55 C for anaerobic digestion? Assume the specific heat capacity of the food waste is the same as that of the water. (2 marks) iii)