Environmental Engineering Reference
In-Depth Information
Table 4 Fuel characteristics of mine MSW
Mined
MSW
As received MSW
(WIRC
2010
)
ASTM
Proximate analysis (wt%)
Moisture content
a
1.23
46.34
D 3173-87
Volatile matter
b
74.82
41.62
D 3175-89a
Fixed carbon
b
6.95
0.82
D3172-89
Ash
b
18.23
11.22
D 317489-
b
Ultimate analysis
(wt%)
C
53.60
46.10
D 3178-89
H
6.03
6.38
D 3178-89
N
Not detected
1.10
D 3179-89
S
0.16
0.12
D 4239-85c
Other properties
Bulk density (kg/m
3
)
a
90
128.91
Lower heating value (MJ/kg)
b
25.82
8.03
D 3286-91
a
As received basis
b
Dry basis
From Table
3
, mined MSW contains high quantity of soil (43.50 wt%) and
plastic waste (39.98 wt%). Other compositions are paper,
textile/rubber, and
organic waste, as well as non-combustible materials.
After separation of non-combustible material, a mined MSW sample was used to
determine its moisture content, proximate and ultimate analysis, and heating value
according to the ASTM standard. Table
4
shows the fuel characteristics of mined
MSW in comparison with as received MSW. It can be seen that the moisture
content of mined MSW is much lower than that of the as received waste, whereas
volatile matter and ash of mined MSW are higher than those of as received waste
since the decomposition of moist kitchen waste into soil-like material and high
content of plastic waste in mined MSW, consequently, higher heating value.
2.2 Method
2.2.1 Feedstock Preparation
Feedstock used in this study is Refuse Derived Fuel (RDF) from mined MSW.
After solar drying and separation process, mined MSW was cut into the small size
with a width of 5 cm and a length of 15 cm by the 30 hp-shredder. The small size
mined MSW was thereafter heat extruded into the cylinder form with a diameter of
4 cm by a 480 kg/day extruder. Finally, extruded mined MSW was cut to the length
of 5
7 cm which is called dense-RDF, as shown in Fig.
2
.
-
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