To recycle a material there must be a procedure of prior selection, the separation of the general waste paper, plastic, glass, metal, organic and non-recyclable. A selection process is currently well known selective collection, which is nothing more than a garbage disposal made selectively.
After separation of waste, it is necessary to make a new separation into subtypes materials so that they have an interest. Then, all recyclable materials are selected in subtypes, usually by screening plants such as the City of São Paulo or cooperatives that after this procedure, compress materials to facilitate transport and sell to recycling industries.
To recycle, not enough to separate the materials from each other. We must keep in mind the three basic R of recycle. There are :
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