| Summary: | 碩士 === 國立成功大學 === 環境工程與科學系 === 85 === Styrene and butadiene are used in large quantities by the chemical industry, mainly as a starting material for synthetic polymers such as polystyrene, polybutadiene, and styrene-butadiene rubber. Transfer of these compounds to plant air typically occurs during drying operation at ABS plastics manufacturing facilities. Airborne emissions of stgrenne and butadiene often cause problems, even at low concentrations, due to the malodorous and hazardous properties of these compounds.
The purpose of this research is to evaluate the elimination efficiency, total organic load, and elimination capacity of styrene and butadiene by various types of biofilter systems. capacity of styrene and butadiene by various types of biofilter ysytems. The pig waste compost and pig waste compost mixed with activated carbon seeding with activated sludge or butadiene degrading bacteria were used as the materials of biofilters.
For styrene removing experiments, it had shown that no matter if the biofilter media were mixed with activated carbon or not, the elimination efficiency and elimination capacity of these biofilters have no obvious difference. Under 20-840 ppm of inlet gas concentration, and 2.26 minute of residence time, the elimination effciiencyof the pig waste compost biofilter was found between 70-100%, and the performance of pig waste compost mixed with activated carbon filters were found between 65-100%. The maximum elimination capacity of the biofilters were found between 75± 10 g/m3.hr.
For butadiene removing experiments, the biofliler of pig waste compost mixed with activated carbon and seeding with butadiene degrading becteria had the maximum elimination efficiency and capacity. Under 40-1420 ppm of inlet gas concentration, and 2.26 minute of residence time, the elimination efficiency was found between 70-100%, and the maximum elimination capacity was about 65 g/m3.hr. The results showed that adding activated carbon to pig waste compost and seeding with butadiene degrading bacteria can help arising the elimination efficiency and capacity of butadiene.
For mixed styrene and butadiene removing experiments, the pig waste compost mixed with activated carbon, seeding with activated sludge and butadiene degrading bacteria filter had shown the 95% elimination efficiency of srene under 80-270 ppm of styrene and 40-430 ppm of butadiene inlet concentration and 2.26 minutes of residence time. However, the elimination efficiency of butadiece significantly decreased from 95% to 25% while the inlet concentration of butadiene increased to above 220 ppm. This result indicated that the styrene appeared apparent inhibition effect to the butadiene in the biofilter.
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