Question

A community of 50000 single family dwellings, with an average of 5 persons per dwelling, intends to use a collection system in which two containers are to be used. The two container system will consist of one container, A, for combined recyclables and a second container, B, used for the remainder of the wastes. Given the following data: Waste generation rate of 2.0 kg/cap.d The recyclables in A, with a density of 75 kg/m3, constitute 31% of the total weight of solid waste generated. The remaining solid waste collected in B has a density of 120 kg/m3. Recovery and participation factors to be 100% Collection frequency: twice-a-week Collection vehicle: Loading volume = 12 m3; Pay-load = 8 t Working days in a week: 5 The collection vehicle will collect only the wasted material (Container B). It will be able to make 3 trips a day to the landfill site which is 30 km from the collection region. (Alternate arrangements are in place for collection of recyclables in Container A). (1) Recommend suitable sizes for the two containers, A and B, for use in each dwelling. (ii) How many collection vehicles are required for proper collection of the wasted materials (Container B) from the area?

Answer 1