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Application of a Slow-Release Fertilizer for Oil Bioremediation in Beach Sediment

^a Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576
^b Tropical Marine Science Institute, 14 Kent Ridge Road, Singapore 119223

View larger version (35K): [in a new window]   Fig. 1. Concentrations of NH+4–N, NO–3–N, and PO3–4–P in sediment pore water extracts during the 105-d period experiment. Error bars represent ±1 standard deviation unit. C, control samples; Os, Osmocote-treated samples.

View larger version (20K): [in a new window]   Fig. 2. Dehydrogenase activity of microbial biomass in oil-spiked control (C) and Osmocote-treated (Os) sediments. Error bars represent ±1 standard deviation unit.

View larger version (20K): [in a new window]   Fig. 3. First-order decline in total recoverable petroleum hydrocarbons (TRPH). Error bars represent ±1 standard deviation unit. C, control samples; Os, Osmocote-treated samples.

View larger version (17K): [in a new window]   Fig. 4. First-order decline in total n-alkanes. Error bars represent ±1 standard deviation unit. C, control samples; Os, Osmocote-treated samples. C/CH, hopane-normalized concentration of total n-alkanes.

View larger version (16K): [in a new window]   Fig. 5. First-order decline in total target polycyclic aromatic hydrocarbons (PAHs) (i.e., two- to six-ring PAHs and C1 to C4 alkyl homologs of two- and three-ring PAHs). Error bars represent ±1 standard deviation unit. C, control samples; Os, Osmocote-treated samples. C/CH, hopane-normalized concentration of total n-alkanes.