title: Combined effects of DOM and biosurfactant enhanced biodegradation of polycylic armotic hydrocarbons (PAHs) in soil-water systems.
abstract: This study systematically investigated the interactive effects of dissolved organic matter (DOM) and biosurfactant (rhamnolipid) on the biodegradation of phenanthrene (PHE) and pyrene (PYR) in soil-water systems. The degradations of two polycyclic aromatic hydrocarbons (PAHs) were fitted well with first order kinetic model and the degradation rates were in proportion to the concentration of biosurfactant. In addition, the degradation enhancement of PHE was higher than that of PYR. The addition of soil DOM itself at an environmental level would inhibit the biodegradation of PAHs. However, in the system with co-existence of DOM and biosurfactant, the degradation of PAHs was higher than that in only biosurfactant addition system, which may be attributed to the formation of DOM-biosurfactant complex micelles. Furthermore, under the combined conditions, the degradation of PAH increased with the biosurfactant concentration, and the soil DOM added system showed slightly higher degradation than the compost DOM added system, indicating that the chemical structure and composition of DOM would also affect the bioavailability of PAHs. The study result may broaden knowledge of biosurfactant enhanced bioremediation of PAHs contaminated soil and groundwater.
authors.affiliation: MOE Key Laboratory of Regional Energy Systems Optimization, S&C Academy of Energy and Environmental Research, North China Electric Power University, Beijing, 102206, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Yu
authors.forename: Guo-He
authors.initials: GH
authors.lastname: Huang
authors.forename: Huining
authors.initials: H
authors.lastname: Xiao
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
mesh_terms: D000150:Acinetobacter / Q000378:metabolism*; D000704:Analysis of Variance; D001673:Biodegradation, Environmental; D004785:Environmental Pollutants / Q000032:analysis / Q000378:metabolism*; D005618:Fresh Water / Q000737:chemistry*; D006017:Glycolipids / Q000494:pharmacology*; D006812:Humic Substances; D007700:Kinetics; D008823:Micelles; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000378:metabolism*; D011721:Pyrenes; D012525:Saskatchewan; D012987:Soil / Q000737:chemistry*; D013501:Surface-Active Agents / Q000494:pharmacology*
chemical_list: D004785:Environmental Pollutants; D006017:Glycolipids; D006812:Humic Substances; D008823:Micelles; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012987:Soil; D013501:Surface-Active Agents; C418382:rhamnolipid; C031181:phenanthrene; C030984:pyrene