Sorting serves to split the waste volume into separate fractions which will undergo different measures of treatment.
Transportation and transshipment are necessary to span the physical distance between consecutive processes of reverse logistics.
Warehousing takes place before transportation, transshipment or processing ac- tivities. It is mainly necessary in order to receive lot sizes that fully utilize transportation or processing facilities. As waste has little or no value, capital lockup in stock does not have same importance as in traditional warehousing
Processing activities result in the transformation of waste into reusable products or into a condition in which it is harmless to the environment.