25
2015). These items consist of casings, screens, touch screens, batteries, and mainboards. The older generation of mobile phones was easier to disassemble. A battery
removal was simple. Currently, the batteries are integrated into the devices and
manual removal requires a long time. In such a case, the labor cost exceeds potential
revenues (Terazono et al. 2015).
Estimation of economic efficiency indicator W p
t for a disassembly and recycling
line in a plant can be calculated using the following formula – 1 (Nowakowski 2017):
W
r
c
p
t
i
d
j
m i
i j
i
d
j
m i
i j
=
=
=
( )
=
=
( )
∑ ∑
∑ ∑
1
1
1
1
,
,
(2.1)
where W p
t , the efficiency indicator of processing waste equipment using t technology; t, a number of the technology in the recycling plant; r i,j , revenues after sale of
j-th material to third parties [euro]; m(i), a number of raw materials acquired after
processing i-th piece of waste; d, a number of waste equipment for processing; and
c i,j , total cost of disassembly and processing (labor, energy, depreciation, and others)
of i-th the piece of waste for j-th material using t technology.
And total efficiency indicator W p for all disassembly lines in a plant can be calculated by formula – 2:
W
W
p
i
T
t
p
t
=
⋅
=
∑
1
α
(2.2)
where T
t
T
=
…
{ :
}
1 2
, , , , set of disassembly technology numbers, and T , a number
of disassembling technologies.
Fig. 2.3 Copper components from manual disassembly (left) and copper fraction from the processing line. This material comes from refrigerators and cooling appliances
2 Reconfigurable Recycling Systems of E-waste