| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 92 === This study investigates the treatment of BTEX contaminated-sediments using bioremediation processes in aerobic, denitrifying, and iron reducing environments. Batch tests were conducted for BTEX degradations in sea water containing enriched bacteria, 0.05% (w/v) sediment slurries, and 10% (w/v) sediment slurry. Data from biodegradations of individual BTEX compounds in sea water were analyzed to determine Monod biokinetic parameters. The bioavailiability factor developed by Zhang (1998) was modified with Monod constants, which was used to model the biodegradations of BTEX and estimate the mass of cultures degrading individual BTEX compounds in the 0.05% sediment slurry.
Results showed that in 0.05% sediment slurries the highest reaction rate for aerobic process is toluene, while for denitrifying is benzene and for iron-reducing is toluene. The results also indicated that to total aerobic bacteria the mass ratios of particular aerobic bacteria that could degrade benzene, toluene, ethylenebenzene, and xylene are 11.1~16.7%, 3.5~5.7%, 1~1.4% and 13.9~17.1% respectively. And the mass ratios of particular denitrifying bacteria, in degrading benzene, toluene, ethylenebenzene, and xylene, to total denitrifying bacteria are 7.5~9.3%, 5.1~13.75%, 1.1~10% and 5~6.9% respectively. The predicted curve of individual BTEX biodegradations in 10% sediment slurry was in good agreement with measurements by using the estimated biomass and modified bioavailiability factor. The findings from this study can be applied in-situ bioremediation of sediments contaminated with BTEX.
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