Assignment: (MRF design) A materials recovery facility is to be designed to process 150 ton/day of source-separated paper with a composition as shown in Table 1. The process flow diagram is shown in Figure 1. Based on a 7 hr/day operation, determine the number of workers required for manual sorting, assuming that an average worker can manually sort approximately 2.5 ton/hr. Evaluate the hourly recovery rates of respective materials from the baler and assess whether the baler would be capable of baling all of the materials within a day of operation (the baler is fed in batches by a front end loader when a minimum of 4 tons of material have been accumulated). Table 1: Composition of source separated paper Components (%) Recovery factor Mixed paper and cardboard Collection vehicle Receiving area Front-end loader used to spread waste for presorting Presorting area Bulky items Front-end loader, floor and inclined conveyor Manual sorting Contaminants Mixed Nowsprint Cardboard paper Old newsprint 71 Paper (mixed) 14 Old corrugated 13 cardboard Contaminants 2 0.95 0.95 2 0.95 Baling Forklift Indoor storage of balad paper Forklift Shipping Figure 1. Process flow