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?

3.1kviews

written 8.5 years ago by

teamques10 ★ 68k

• modified 8.5 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$=(100*13508/100-5-12.62) \\ = 16397.18 KJ/kg.$

ADD COMMENT EDIT