Abstract
The objective of this study was to assess the potential of applying enhanced bioremediation on the treatment of petroleum-hydrocarbon contaminated soils. Microcosm experiments were conducted to determine the optimal biodegradation conditions. The control factors included oxygen content, nutrient addition, addition of commercially available mixed microbial inocula, addition of wood chip and rice husk mixtures (volume ratio=1:1 ) as bulking agents, and addition of organic amendments (chicken manures). Results indicate that the supplement of microbial inocula or chicken manures could significantly increase the microbial populations in soils, and thus enhance the efficiency of total petroleum hydrocarbon (TPH) removal (initial TPH=5,500 mg/kg ). The highest first-order TPH decay rate and removal ratio were approximately 0.015 day−1 and 85%, respectively, observed in microcosms containing microbial inocula (mass ratio of soil to inocula=50:1 ), nutrient, and bulking agent (volume ratio of soil to bulking agen...
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