title: Application of sewage sludge and intermittent aeration strategy to the bioremediation of DDT- and HCH-contaminated soil.
abstract: Adding organic amendments to stimulate the biodegradation of pesticides is a subject of ongoing interest. The effect of sewage sludge on the bioremediation of dichlorodiphenyltrichloroethane (DDT) and hexachlorocyclohexane (HCH) contaminated soil was investigated in bench scale experiments, and intermittent aeration strategy was also used in this study to form an anaerobic-aerobic cycle. Bioremediation of DDT and HCH was enhanced with the addition of sewage sludge and the intermittent aeration. The removal rates of HCH and DDT were raised by 16.8%-80.8% in 10 days. Sewage sludge increased the organic carbon content from 6.2 to 218 g/kg, and it could also introduce efficient degradation microbes to soil, including Pseudomonas sp., Bacillus sp. and Sphingomonas sp. The unaerated phase enhanced the anaerobic dechlorination of DDT and HCH, and anaerobic removal rates of β-HCH, o,p'-DDT and p,p'-DDT accounted for more than 50% of the total removal rates, but the content of α-HCH declined more in the aerobic phase.
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: liangq.08s@igsnrr.ac.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Liang
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: leim@igsnrr.ac.cn.
authors.forename: Mei
authors.initials: M
authors.lastname: Lei
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Tongbin
authors.initials: T
authors.lastname: Chen
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wan
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Sucai
authors.initials: S
authors.lastname: Yang
mesh_terms: D001673:Biodegradation, Environmental; D003634:DDT / Q000737:chemistry* / Q000378:metabolism; D001556:Hexachlorocyclohexane / Q000737:chemistry* / Q000378:metabolism; D010100:Oxygen; D012722:Sewage; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry* / Q000378:metabolism; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D003634:DDT; D010100:Oxygen
keywords: Aeration strategy; Bioremediation; Dichlorodiphenyltrichloroethane (DDT); Hexachlorocyclohexane (HCH); Sewage sludge