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Anaerobic Degradation of Petroleum Hydrocarbons in Soil by Application of a Digestion Sludge  

Lee, Tae-Ho (Department of Environmental Engineering, Pusan National University)
Byun, Im-Gyu (Institute for Environmental Technology and Industry, Pusan National University)
Park, Jeung-Jin (Department of Environmental Engineering, Pusan National University)
Park, Hyun-Chul (Department of Environmental Engineering, Pusan National University)
Park, Tae-Joo (Department of Environmental Engineering, Pusan National University)
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Abstract
Anaerobic degradation of petroleum hydrocarbons in a soil artificially contaminated with 10,000 mg/kg soil of diesel fuel was tested by adding an anaerobic sludge taken from a sludge digestion tank. Treatments of soil(50 g) with 15 mL/kg soil and 30 mL/kg soil of the digestion sludge(2,000 mg/L of vss(volatile suspended solids)) showed 37.2% and 58.0% of total petroleum hydrocarbons(TPH) removal during 90 days incubation, respectively. In evaluation of several anaerobic conditions including nitrate reducing, sulfate reducing, methanogenic, and mixed electron accepters condition, treatments with the digested sludge showed significant degradation of diesel fuel under all anaerobic conditions compare to a control treatment of soil without the sludge and a treatment of autoclaved soil treatment with autoclaved digestion sludge. The rate of diesel fuel degradation was the highest in the treatment with the sludge and mixed electron accepters (75% removal of TPH) for 120 days incubation followed in order by sulfate reducing, nitrate reducing, methanogenic condition as 67%, 53%, 43%, respectively. However, the removal rate of non-biodegradable isoprenoid was the highest in the sulfate reducing condition. These results suggest that anaerobic degradation of diesel fuel in soil with digested sludge is effective for practical remediation of soil contaminated with petroleum hydrocarbons.
Keywords
Soil Contamination; Diesel Fuel; Bioaugmentation; Anaerobic Digestion Sludge; Electron Accepters;
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