A city generates1000 tonnes waste/day:15% recycled,40% composted,25% sent to RDF production at 80% mass efficiency, and the rest landfilled. RDF heating value15 MJ/kg and electricity efficiency20%. Find electricity in MWh/day, to two decimals.
RDF feed is 250 tonnes/day and RDF product is $.8(250)=200$ tonnes/day=200000 kg/day. Thermal energy is $200000(15)=3000000$ MJ/day. Electrical output is 20% of that,600000 MJ/day. Since1 MWh=3600 MJ, output is **166.67 MWh/day**. The other waste streams do not add to RDF energy.
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