title: Remediation of phthalates in river sediment by integrated enhanced bioremediation and electrokinetic process.
abstract: The objective of this study was to evaluate the feasibility of enhanced bioremediation coupling with electrokinetic process for promoting the growth of intrinsic microorganisms and removing phthalate esters (PAEs) from river sediment by adding an oxygen releasing compound (ORC). Test results are given as follows: Enhanced removal of PAEs was obtained by electrokinetics, through which the electroosmotic flow would render desorption of organic pollutants from sediment particles yielding an increased bioavailability. It was also found that the ORC injected into the sediment compartment not only would alleviate the pH value variation due to acid front and base front, but would be directly utilized as the carbon source and oxygen source for microbial growth resulting in an enhanced degradation of organic pollutants. However, injection of the ORC into the anode compartment could yield a lower degree of microbial growth due to the loss of ORC during the transport by EK. Through the analysis of molecular biotechnology it was found that both addition of an ORC and application of an external electric field can be beneficial to the growth of intrinsic microbial and abundance of microflora. In addition, the sequencing result showed that PAEs could be degraded by the following four strains: Flavobacterium sp., Bacillus sp., Pseudomonas sp., and Rhodococcus sp. The above findings confirm that coupling of enhanced bioremediation and electrokinetic process could be a viable remediation technology to treat PAEs-contaminated river sediment.
authors.affiliation: Center for Emerging Contaminants Research, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC; Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
authors.forename: Gordon C C
authors.initials: GCC
authors.lastname: Yang
authors.affiliation: Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC. Electronic address: harm360@gmail.com.
authors.forename: Sheng-Chih
authors.initials: SC
authors.lastname: Huang
authors.affiliation: Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Jen
authors.affiliation: Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, ROC.
authors.forename: Pei-Shin
authors.initials: PS
authors.lastname: Tsai
mesh_terms: D001419:Bacteria / Q000302:isolation & purification / Q000378:metabolism; D001673:Biodegradation, Environmental; D055664:Electrochemical Techniques; D004952:Esters; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology*; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D010795:Phthalic Acids / Q000378:metabolism*; D045483:Rivers / Q000737:chemistry / Q000382:microbiology*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D004952:Esters; D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; D010100:Oxygen
keywords: Electrokinetic process; Enhanced bioremediation; Molecular biotechnology; Oxygen releasing compound; Phthalate esters; Sediment