Discussion
Which is performed by physical means and involved separation, wasting griding, remelting and processing plastic wastes ?
Answer: A
The process is mechanical recycling.
Mechanical recycling recovers plastics by physical means only. The waste is collected, sorted and separated, washed, ground into flakes, then melted and re-processed (extruded or pelletised) into new products. The polymer's chemical structure is not deliberately changed.
Chemical recycling breaks the polymer down into monomers or feedstock by processes such as pyrolysis, gasification or depolymerisation. Thermal recycling usually means energy recovery by burning the plastic. Biological recycling uses microorganisms or enzymes to degrade the plastic. Each of these changes the material chemically, unlike the process described.
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