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|Title:||Enhancement of oil biodegradation in beach sediments using slow-release fertilizers|
|Citation:||Xu, R.,Obbard, J.P. (2004). Enhancement of oil biodegradation in beach sediments using slow-release fertilizers. Remediation of Contaminated Sediments - 2003: Proceedings of the Second International Conference on Remediation of Contaminated Sediments : 299-304. ScholarBank@NUS Repository.|
|Abstract:||Acceleration of the indigenous hydrocarbon biodegradation process may be achieved by amending key nutrients to oil-contaminated beach sediment on the intertidal foreshore environment. This study was undertaken to investigate the stimulatory effect of the slow-release fertilizers Osmocote (Os) and Inipol EAP-22 (Ip) combined with inorganic nutrients on the bioremediation of oil-spiked beach sediments using an open irrigation system with artificial seawater over a 45-d period. Nutrient concentrations (i.e., NH3-N, NO3-N, and total P) in seawater leachate from the sediments treated with Os were maintained at higher levels and resulted in higher metabolic dehydrogenase activity (DHA) of the microbial biomass than the other treatments throughout the 45-d experiment. Therefore, losses of both aliphatics and target PAHs were significantly greater (total loss between 95 and 97% for aliphatics, 81 and 91% for PAHs) in sediments treated with Os alone or in combination with other nutrient amendments, compared with the unamended oil-spiked control or sediments treated with the other nutrient amendments (26-65% aliphatic loss and 42.0-45.8% PAH loss). In summary, the slow release fertilizer Os was the most favorable nutrient source for the enhanced biodegradation of petroleum hydrocarbons in leached, oil-contaminated sediments in this study.|
|Source Title:||Remediation of Contaminated Sediments - 2003: Proceedings of the Second International Conference on Remediation of Contaminated Sediments|
|Appears in Collections:||Staff Publications|
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