In recent three decades, the global productions of plastic and
the waste generated by householders and industries have grown
exponentially. Dealing with the enormous waste is now a major
task worldwide. Plastics degrade slowly and incineration may generate
toxic emissions and bottom ash (Curlee and Das, 1991). Recycling
has become the primary policy for treating plastic waste in
many countries. However, due to the low-grade uses of recycled
plastics, most of the facilities which adopt material recycling method
for treating plastic waste in Taiwan simply use filter placed in
local ventilation system to treat the melting fumes generated from
electrically-heated extruders. Although some of these plants additionally
use scrubbers to treat the exhaust, both fumes and odor
eliminations are unsatisfactory. These emissions may contain some
toxicants which threaten the health of nearby residents and always
cause sensory annoyance.