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http://dx.doi.org/10.5394/KINPR.2016.40.6.441

A Pilot Scale Biostimulation Study for In-situ Remediation of Organic Pollutants and PAHs contained in Coastal Sediment  

Bae, Byung-Uk (Department of Environmental Engineering, Daejeon University)
Woo, Jung-Hui (Nuclear Power Equipment Research Center, Korea Maritime and Oean University)
Subha, Bakthavachallam (Department of Environmental Engineering, Korea Maritime and Oean University)
Song, Young-Chae (Department of Environmental Engineering, Korea Maritime and Oean University)
Abstract
A pilot scale biostimulation experiment was performed under field conditions to degrade organic pollutants and PAHs (Polycyclic Aromatic Compounds) in contaminated coastal sediment. During the experiment, the seawater temperature around the sediment varied from $16.5^{\circ}C$ to $21^{\circ}C$, while the sediment pH was stable at 8.4-8.5. The experiment was conducted over a one year period with a control group and a sample group with a applied biostimulant composed of acetate, sulfate, and nitrate. Chemical oxygen demand decreased 39% in the control group and 79% in the sample group. Volatile solids were reduced from 15 to 7 g/kg in the control group and 2.5 g/kg in the sample group. Out of the 2-, 3- ,4- ,5-, and 6-rings of the 16 vital PAHs, the compound including naphthalene (2-ring), took 2 months to degrade completely, while the degradation efficiency was 55.6% in the control group during the same period. In the case of the 3-ring and 4-ring PAHs, complete degradation in the sample and 46% - 100% degradation in control was observed after one year of the experiment. The 5-ring and 6-ring PAHs were degraded to about 77%-100% in the sample group and 26%-87% in the control group during the one year of the experiment. The study results show that biostimulation is a very effective method to improve the degradation rate of organic pollutants and PAHs (Polycyclic Aromatic Compounds) in contaminated coastal sediment.
Keywords
Contaminated Coastal Sediment; PAHs; Biostimulant; Organic Pollutants; Bioremediation;
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