The main limit of the above formulation is the absence of
differentiation between different waste commodities. Mansini and
Speranza [54] overcome such a limit by generalising it to the case
of separate collection of different types of refuse (organic waste,
glass, paper, etc.). As recyclable materials (such as glass and paper)
may have a longer accumulation period, the authors are able to
reduce peak by 18.5% in the considered case study.