1) Problem 1: Hobson reported that they composted 3.5 tons of organic waste in a

Question

1) Problem 1: Hobson reported that they composted 3.5 tons of organic waste in a windrow that was 2 m high, 10 m long, and 3 m wide. What is the SG gravity of the compost? What is the density in kg/m3, g/cm3, and lbm/ft3? Skills: unit conversions, geometries, specific gravity 2) Problem 2: Hobson reported that the emissions of methane from a composting windrow that was 2 m high, 10 m long, and 3 m wide placed on a cement slab and containing 3.5 tons of compostable material were the following Window CH4 Flux in Day mg/m /h 7 6.604 14 4.142 21 1.055 35 6.12 50 5.02 64 0.862 78 0.05 92 0.215 What were the total emissions of methane in kg CH4 kg compostable material over the 92 days of the experiment? Skills: logic, approximating missing data

Explanation / Answer

Ans 1

Mass of organic waste = 3.5 tons x 1000kg/ton = 3500 kg

Volume of windrow = height x length x width

= 2 x 10 x 3 = 60 m3

Density in kg/m3 = mass /volume

= 3500 kg / 60 m3

= 58.33 kg/m3

Density in g/cm3 = (58.33 kg/m3) x (1000g/kg) x (1m/100cm)3

= 0.0583 g/cm3

Density in lbm/ft3

= (58.33 kg/m3) x (2.205lb/kg) x (1m/3.28084ft)3

= 3.642 lbm/ft3

Specific gravity = Density in kg/m3 / density of water in kg/m3

= 58.33 kg/m3 / 1000 kg/m3

= 0.0583

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