3.1 Estimate the maximum number of residences it can be served per week by a typical compactor truck that has a capacity of 28 yd. The truck can make three trips per day, works for 6 days per week. Assume a generation rate of 4.5 Ib/capita/day, each residence contains 3.5 capita, and the density of solid waste in the truck is 500 Ib/cubic yard.

To treat solid waste generated from a town of population 80000, a landfill is designed. The per capita solid waste generation is 1.8 kg/day/person and density of compacted solid waste is 1250 kg/m3. The solid waste cover factor is 3.0. Estimate the area of landfill required in hectares for 15 years of operation. Assume depth of landfill as 5 m.

For the following wastewater and biomass characteristics: Q0 = 50 m3/d S0 = 60 mg NH4+-N/l Xi0 = 20 mg/l k= 2.5 mg NH4+-N/mg VSS-d K = 1 mg/l Y = 0.34 g VSS/g NH4+-N b = 0/day Calculate the volume of the CSTR required for 50 and 98% removal of ammonia by oxidation to nitrate.