title: Contributions of Abiotic and Biotic Dechlorination Following Carboxymethyl Cellulose Stabilized Nanoscale Zero Valent Iron Injection.
abstract: A pilot scale injection of nanoscale zerovalent iron (nZVI) stabilized with carboxymethyl cellulose (CMC) was performed at an active field site contaminated with a range of chlorinated volatile organic compounds (cVOC). The cVOC concentrations and microbial populations were monitored at the site before and after nZVI injection. The remedial injection successfully reduced parent compound concentrations on site. A period of abiotic degradation was followed by a period of enhanced biotic degradation. Results suggest that the nZVI/CMC injection created conditions that stimulated the native populations of organohalide-respiring microorganisms. The abundance of Dehalococcoides spp. immediately following the nZVI/CMC injection increased by 1 order of magnitude throughout the nZVI/CMC affected area relative to preinjection abundance. Distinctly higher cVOC degradation occurred as a result of the nZVI/CMC injection over a 3 week evaluation period when compared to control wells. This suggests that both abiotic and biotic degradation occurred following injection.
authors.affiliation: ∥CH2M HILL Canada Limited, 72 Victoria Street, Kitchener, Ontario N2G 4Y9, Canada.
authors.forename: Chris M D
authors.initials: CM
authors.lastname: Kocur
authors.forename: Line
authors.initials: L
authors.lastname: Lomheim
authors.forename: Hardiljeet K
authors.initials: HK
authors.lastname: Boparai
authors.forename: Ahmed I A
authors.initials: AI
authors.lastname: Chowdhury
authors.affiliation: §Environmental Sciences Group, Chemistry and Chemical Engineering, Royal Military College of Canada, P.O. Box 17000, Station Forces, Kingston, Ontario K7K 7B4, Canada.
authors.forename: Kela P
authors.initials: KP
authors.lastname: Weber
authors.affiliation: ∥CH2M HILL Canada Limited, 72 Victoria Street, Kitchener, Ontario N2G 4Y9, Canada.
authors.forename: Leanne M
authors.initials: LM
authors.lastname: Austrins
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Edwards
authors.affiliation: ⊥Civil Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada.
authors.forename: Brent E
authors.initials: BE
authors.lastname: Sleep
authors.forename: Denis M
authors.initials: DM
authors.lastname: O'Carroll
mesh_terms: D001673:Biodegradation, Environmental; D002266:Carboxymethylcellulose Sodium / Q000737:chemistry*; D041862:Chloroflexi / Q000235:genetics / Q000302:isolation & purification; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation / Q000379:methods*; D054879:Halogenation; D007501:Iron / Q000737:chemistry*; D009864:Ontario; D055549:Volatile Organic Compounds / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D055549:Volatile Organic Compounds; D007501:Iron; D002266:Carboxymethylcellulose Sodium