Bio-mechanical treatments are extensively used for municipal solid waste
management. One of the problems that can be found in this sector can be related to the change of
the MSW characteristics during the lifetime of the plant. This problem is only partially related to
the dynamics of composition of the generated MSW, as the main source of fluctuation of the
input of the plant is the effect of the implementation of the strategies of selective collection. The
present paper wants to be a contribution of the understanding of this potential problem
presenting a preliminary analysis of a case-study based on the present and expected situation in a
Romanian municipality. The choice of the case-study has been related to the fact that Romania
has just entered into the European Union and than should modify its MSW management strategy
changing from a near zero selective collection scenario to a new scenario that must comply with
the principles of recycling proposed by the European Union directives
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