The Problem Green City, population of 560,000, is going to build a Material Recovery Facility (MRF) for its recyclables. Your first task is to design an MRF for the city. The city is also considering combustion and anaerobic digestion as alternatives to landfilling. The by- products from any of these processes would still need to be landfilled. Your second task is thus to compare the following two options and recommend one to the city: A. MRF + anaerobic digester + landfill (you will only be able to have the yard waste and food waste go to the digester) B. MRF + combustor + landfill. The waste composition for Green City is: Component Percent by Weight Food 20 Paper 26 Textiles 8 Yard 12 Wood 6 Steel 4 Glass 4 Aluminum Plastic 6 14 I recommend setting up a spreadsheet to do repetitive calculations. Pay attention to significant digits - no more than 3 significant digits. Part 1. MRF Design Citizens separate out paper, steel, glass, aluminum, and plastics. Assume a 45% recycling participation rate (45% of the recyclables in the waste stream are separated out and sent to the MRF; the other 55% remain part of the waste stream with the refuse go to the combustor, digester, or landfill). The MRF will include the following unit operations, targeted to separate out the material in parentheses: Hand sorting (plastics) • Trommel screen (glass) • Eddy current separator (aluminum) Magnet (steel) Air classifier (paper) Shredder after the air classifier, to shred the separated paper. • Roll crusher after the magnet, to flatten cans.