Organic Waste Recycling

144 Organic waste recycling: technology and management

Total solids (TS) content = 20% of TWW

Organic compound (as C 10 H 19 O 2 N) = 50% of TS

Fecal coliforms = 10^6 no./100 g

Bacteriophages = 10^4 no./100 g

For continuous compost reactor:
Detention time = 1 day
Temperature inside reactor = 45°C
TS of composted product = 50%

You are to determine the follows:

a) Size and dimensions of this continuous compost reactor suitable for

treating this garbage. Draw schematic diagram of this continuous

compost reactor.

b) The amount of composted product (in kg/day) that needs to be recycled

to maintain the optimum TS content of the compost mixture of 40% at

the inlet of the continuous compost reactor. Assuming that bulk density

of the composted product and the compost mixture is also 1.2 kg/L.

(See Figure 3.5)

c) The amount of air needed to be applied to this continuous compost

reactor to compost the garbage. Assume that the following equation is

applicable.

C 10 H 19 O 3 N + 12.5O 2 ĺ 10CO 2 + 8H 2 O + NH 3

Note: Air contains 20% O 2 by weight and specific weight of air is 1.2 g/L at

25 °C and 1 atmosphere.

d) Based on the public health and scientific point of view, discuss whether

the composted product of this continuous compost reactor is suitable

for use as fertilizer give the reasons (See Figure 3.1)