title: Bioremediation of diesel and lubricant oil-contaminated soils using enhanced landfarming system.
abstract: Lubricant and diesel oil-polluted sites are difficult to remediate because they have less volatile and biodegradable characteristics. The goal of this research was to evaluate the potential of applying an enhanced landfarming to bioremediate soils polluted by lubricant and diesel. Microcosm study was performed to evaluate the optimal treatment conditions with the addition of different additives (nutrients, addition of activated sludge from oil-refining wastewater facility, compost, TPH-degrading bacteria, and fern chips) to enhance total petroleum hydrocarbon (TPH) removal. To simulate the aerobic landfarming biosystem, air in the microcosm headspace was replaced once a week. Results demonstrate that the additives of activated sludge and compost could result in the increase in soil microbial populations and raise TPH degradation efficiency (up to 83% of TPH removal with 175 days of incubation) with initial (TPH = 4100 mg/kg). The first-order TPH degradation rate reached 0.01 1/d in microcosms with additive of activated sludge (mass ratio of soil to inocula = 50:1). The soil microbial communities were determined by nucleotide sequence analyses and 16S rRNA-based denatured gradient gel electrophoresis. Thirty-four specific TPH-degrading bacteria were detected in microcosm soils. Chromatograph analyses demonstrate that resolved peaks were more biodegradable than unresolved complex mixture. Results indicate that more aggressive remedial measures are required to enhance the TPH biodegradation, which included the increase of (1) microbial population or TPH-degrading bacteria, (2) biodegradable carbon sources, (3) nutrient content, and (4) soil permeability.
authors.affiliation: Institute of Environmental Engineering, Kaohsiung, Taiwan.
authors.forename: Sih-Yu
authors.initials: SY
authors.lastname: Wang
authors.affiliation: Formosa Petrochemical Co., Kaohsiung, Taiwan.
authors.forename: Yu-Chia
authors.initials: YC
authors.lastname: Kuo
authors.affiliation: Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, USA.
authors.forename: Andy
authors.initials: A
authors.lastname: Hong
authors.affiliation: Institute of Environmental Engineering and Management, National Taipei University of Technology, Taiwan.
authors.forename: Yu-Min
authors.initials: YM
authors.lastname: Chang
authors.affiliation: Institute of Environmental Engineering, Kaohsiung, Taiwan. Electronic address: jkao@mail.nsysu.edu.tw.
authors.forename: Chih-Ming
authors.initials: CM
authors.lastname: Kao
mesh_terms: D001419:Bacteria / Q000235:genetics / Q000378:metabolism*; D001673:Biodegradation, Environmental; D006838:Hydrocarbons / Q000378:metabolism*; D054327:Lubricants / Q000032:analysis / Q000378:metabolism*; D010578:Petroleum / Q000032:analysis / Q000378:metabolism*; D059392:Petroleum Pollution / Q000032:analysis*; D012336:RNA, Ribosomal, 16S; D012722:Sewage / Q000382:microbiology; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D013624:Taiwan
chemical_list: D006838:Hydrocarbons; D054327:Lubricants; D010578:Petroleum; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants
keywords: Enhanced bioremediation; Landfarming; Soil contamination; Total petroleum hydrocarbon