Municipal solid waste (MSW) is separated by a mechanical sorting plant into a combustible
fraction (30%) and another fraction (70%) that is digested by a subsequent biochemical
process. Approximately half of the latter fraction is transformed to biogas during the anaerobic
treatment.
1.1 Draw the system as a material flow diagram. Assume that MSW total input: 100 kg/d.
1.2 The concentrations of mercury (Hg) are: MSW input, 1.5 mg/kg; combustible fraction, 1.0
mg/kg; biogas, 0.005 mg/kg; digestion product, 3.4 mg/kg. Calculate all the transfer coefficients
for Hg.