In 2014, Logan City collected approximately 7236 tons of recyclable material fro

Question

In 2014, Logan City collected approximately 7236 tons of recyclable material from the residential curbside and commercial recycling programs. Assume that recyclable material was 72% mixed paper, 20% mixed plastic, and 8% metal. a) Using the values in Table 10.5 below calculate the energy value (MJ) of the paper and plastic recyclable material. b) If the average energy content of coal is 28.5 MJ/kg, what is the amount of coal (tons) equivalent to the recyclable paper and plastic, based on energy content?  This is an environmental engineering problem

Table 10.5 Common Physical/Chemical characteristics of solid-waste components Moisture Energy Energy Carbon Hydrogen oxygen Nitrogen sulfur by by Ash by Value as value after by by dry Received Drying dry mass) dry dry dry wet mass) mass) mass m mass) mass) (MJ/kg) (MJ/kg) 37.6 13.9 Food wastes 0.1 38.6 32.9 12.7 12.2 4.1 Magazines 44.3 17.6 43.4 Paper (mixed) 10 15.8

Explanation / Answer

from literature ,calorific value = 13.5 MJ/kg, plastic = 41 Mj/Kg and metal =0.49 Kj/kg

Calorific value of mixed stream =7236*1000 kgs (0.72*13.5+41*0.2+49*0.08)=72.36*103*21.84 Mj=1580342 MJ

coal caloric value = 28.5 MJ/kg

kg of coal required = 1580342/28.5 = 55450.6 Kg

tons of coal required= 55450.6/1000= 55.45 tons

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