title: Enhanced reductive dechlorination of polychlorinated biphenyl-contaminated soil by in-vessel anaerobic composting with zero-valent iron.
abstract: Anaerobic dechlorination is an effective degradation pathway for higher chlorinated polychlorinated biphenyls (PCBs). The enhanced reductive dechlorination of PCB-contaminated soil by anaerobic composting with zero-valent iron (ZVI) was studied, and preliminary reasons for the enhanced reductive dechlorination with ZVI were investigated. The results show that the addition of nanoscale ZVI can enhance dechlorination during in-vessel anaerobic composting. After 140 days, the average number of removed Cl per biphenyl with 10 mg g(-1) of added nanoscale ZVI was 0.63, enhancing the dechlorination by 34 % and improving the initial dechlorination speed. The ZVI enhances dechlorination by providing a suitable acid base environment, reducing volatile fatty acid inhibition and stimulating the microorganisms. The C/N ratios for treatments with the highest rate of ZVI addition were smaller than for the control, indicating that ZVI addition can promote compost maturity.
authors.affiliation: Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
authors.forename: Yu-Yang
authors.initials: YY
authors.lastname: Long
authors.forename: Chi
authors.initials: C
authors.lastname: Zhang
authors.forename: Yao
authors.initials: Y
authors.lastname: Du
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Tao
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Shen
mesh_terms: D000693:Anaerobiosis; D019149:Bioreactors; D052918:Environmental Restoration and Remediation / Q000379:methods*; D054879:Halogenation; D007501:Iron / Q000737:chemistry*; D011078:Polychlorinated Biphenyls / Q000737:chemistry / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls; D007501:Iron