Abstract
The amounts discarded laptop PC for home and business use from 1989-2025, desktop PC for home and business use from 1989-2025, mobile phone from 1991-2025 and PHS (handy phone system) from 1996-2025 have been estimated using population balance model. It is found that the discarded amounts of home PC are still increasing after 2010, while that increase rates in case of mobile phone and PHS are slight. The amounts of elements in all the discarded products have been estimated too using literatures and measured values. The impacts of the elements are discussed based on the comparison with domestic demands, the values weighted by total materials requirement (TMR) and the elemental concentration in the products normalized by that in crude ore.
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