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• W2037268518 abstract "Pretreatment zones (PTZs) composed of sand, 10% zero-valent iron [Fe(0)]/sand, and 10% pyrite (FeS2)/sand were examined for their ability to prolong Fe(0) reactivity in above ground column reactors and a subsurface permeable reactive barrier (PRB). The test site had an acidic, oxic aquifer contaminated with tetrachloroethylene (PCE) and trichloroethylene (TCE). The 10% FeS2 and 10% Fe(0) PTZs removed dissolved oxygen and affected the pH and E(h) in the PTZ. None of the PTZs had any effect on pH or E(h) in the 100% Fe(0) zone. Nitrate and sulfate were removed more quickly in the Fe(0) zones preceded by either the 10% Fe(0) PTZ or 10% FeS2. PCE first-order degradation rate constants (k(obs)) decreased significantly (> 80%) with increasing column pore volumes regardless of the PTZ material used. k(obs) finally leveled off after approximately 1 yr of operation. The column results predict that the PRB will experience a breakthrough of PCE in 3-5 yr and illustrate the importance of incorporating temporal variations in degradation rate constants when designing PRBs." @default.
• W2037268518 created "2016-06-24" @default.
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• W2037268518 date "2003-05-15" @default.
• W2037268518 modified "2023-10-15" @default.
• W2037268518 title "Use of Pretreatment Zones and Zero-Valent Iron for the Remediation of Chloroalkenes in an Oxic Aquifer" @default.
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• W2037268518 doi "https://doi.org/10.1021/es0207302" @default.
• W2037268518 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12854726" @default.
• W2037268518 hasPublicationYear "2003" @default.
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