Calculate the energy content of solid waste sample for the composition given below. What is the content on dry basis and ash free dry basis?

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written 9.6 years ago by

teamques10 ★ 70k

• modified 9.6 years ago

Assume 100 kg of sample.

Component	% by mass	Energy KJ/kg	Total Energy (KJ)
(1)	(2)	(3)	(4) (2*3)
Paper	40	17770	710800
Cardboard	12	15800	189600
Plastics	12	16400	196800
Good wastes	16	5000	80000
Garden wastes	8	7000	56000
Wood	6	19000	114000
Tin cans	6	600	3600
-	100%	-	1350800 KJ

1) Unit Energy Content$= 1350800/100 \\ =13508 KJ/kg$

2) Energy content on dry basis:

Component	% by mass	Moisture content	Dry content,(100-m)%	Total mass
(1)	(2)	(3)	(4)	(5) (4*2)
Paper	40	6	94	37.6
Cardboard	12	5	95	11.4
Plastics	12	2	98	11.76
Good wastes	16	20	80	12.8
Garden wastes	8	60	40	3.2
Wood	6	20	80	4.8
Tin cans	6	3	97	5.82
-	100%	-	-	87.38

Moisture content$= (100-87.38/100)*100 \\ =12.62%$

Energy on dry basis$= (100*13508/100-12.62) \\ =15458.91 KJ/kg$

3) Energy on ash free dry basis:

Assume ash content =5%

Energy content$=(100*13508/100-5-12.62) \\ = 16397.18 KJ/kg.$

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