The local waste management agency has proposed to set up a waste combustion facility next to the existing landfill to maximize the life span of the landfill. Given the following information, determine how much the life span of the landfill is increased by the combustion.

(a) Composition of MSW as given in column 1 of Table 3-4.

(b) Estimated landfill capacity remaining = 300,000 yd3

(c) Capacity of combustion facility = 50 ton waste/h

(d) Effective on-line combustion time per day = 22 h

(e) Initial specific weight of waste = 287 lb/yd3

(f) Final specific weight of waste (MSW and ash) in landfill = 1200 lb/yd3

TABLE 3-4 Typical physical composition of residential MSW excludinn ranualan hazardous wastes. b Twenty percent of the households in the United States are assumed to have food waste grinders. Additionally, it is assumed that the percentage of food waste ground up and discharged with wastewater is 25 percent. Current (1990) recycling rate for the United States assumed to be 11 percent. "Adapted in part from Ref. 10. Based on measurements made over a five-year period (1985 to 1990) during the first two weeks of October (see Table 3-9)