10 07 29 Master thesis Juliana Leon - e-Waste. This guide

The ISC allows the boost of sales figures in an attempt to take into account the
informal market in developing countries that involves activities such as illegal import,
local assembly of non-branded products, and electronic equipments bought abroad
by travellers (Equation 3). For a completely formal market, the ISC is equal to 1, and
for a country where informal sales amount to the number of formal sales, the ISC is
equal to 2. The RWC is integrated in an effort to take into account repair and
refurbishment activities that feed a low-cost second-hand market by adding the
additional waste generated by these activities (Equation 4). If the average lifespan for
the second-hand devices is called ls 2 H
, then, the RWC would be the percentage of
the WEEE generated and re-entering the market in the year
accounted for as waste in the year t .
€
!
WEEE generation DC
(t) = ISC " Sales(t # ls) + RWC € " Sales(t # ls # ls 2 H
)
€
ISC = f (illegal import, non branded, travellers equipments...)
!
The parameters used for the model calculations are shown in Table 3.
t − ls 2 H
that is again
Table 3: Parameters for the market supply method adapted to developing countries used in
this study for the three different computer waste generation scenarios.
Parameter Description
PC waste generation scenarios
Lower Middle Upper
ISC Increase of sales data due to informal sales 1 1.2 1.4
RWC
!
RWC = f (Waste from 2nd hand PCs)
Second-hand PCs sold at the year
t − ls 2 H 0% 15% 30%
ls 2 H
Second-hand equipment lifespan - 4 4
(2)
(3)
(4)
€
2.1.3 Data collection and assumptions
€
Historical market data for desktop and laptop PCs was obtained from publications
citing IDC Colombia (Ott, 2008 and CCIT, 2009). As information for sales of CRTand
LCD-monitors was not available, it was assumed that with every CPU there was
one monitoƒr (CRT or LCD) sold, and that the fraction of LCD-/CRT-monitors sold
each year was the same as in Chile (Steubing, 2007). According to this, Figure 3
shows the historical and projected sales for the “Middle” scenario. Projections of
market evolution were made according to Table 4.
9