Question

Determine the amount of air required to compost 7 tons of solid
wastes using in vessel composting systemwith forces aeration.
Assume that the composition of the organic fraction of the MSW to
be composted is given by
C_{60}H_{100}O_{40}N. Assume that:

a. Moisture content or organic fraction of MSW:25%

b. Biodegradable volatile solids = 0.60 x TS

c. Air contains 21%
oxygen and the specific weight of air is 1.2 kg/m^{3} at 20
^{o}C.

Answer #1

**1. Determine the mass of biodegradable volatile solids
in 7 tons of solid waste**

Biodegradable volatile solids = 0.60 x TS

Moisture content or organic fraction of MSW:25%

TS(TOTAL SOLIDS ) = 75%

**mass of biodegradable volatile solids
(BVS)=** 0.6*0.75*7*1000 kg = 3150kg

2.**Determine the amount of oxygen required for
decomposition of 1 kg of BVS**

C_{60}H_{100}O_{40}N + 64.25
O2 → 60.0 CO2+ 48.5 H2O + N

Molecular wt of C_{60}H_{100}O_{40}N
=1474g

Molecular wt 64.25 O2 = 2056g

O2 required =2056/ 1474 = 1.39 kgO2 /kgBVS

3.**Determine the total amount of air required for 7 ton
of MSW, containing 3150 kg of BVS, as determined in Step
1**

**Air Required= (3150kg*1.390)/(0.21*1.2kg/m ^{3})=
17375m^{3}**

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