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首页> 外文期刊>Environmental Science & Technology: ES&T >Temperature Effects on PCE Degradation on ZVI in Column Experiments with Deionized Water
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Temperature Effects on PCE Degradation on ZVI in Column Experiments with Deionized Water

机译：Temperature Effects on PCE Degradation on ZVI in Column Experiments with Deionized Water

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The effects of rising groundwater temperatures on zerovalent iron(ZVl)-based remediation techniques will be critical in accelerating chlorinated hydrocarbon(CHC)degradation and side reactions.Therefore,tetrachloroethylene(PCE)degradation with three ZVIs widely used in permeable reactive barriers(Gotthart-Maier cast iron [GM],Peerless cast iron [PL],and ISPAT sponge iron [IS])was evaluated at 10-70 ℃ in deionized water.From 10 to 70 ℃,PCE degradation half-lives decreased from 25 ± 2 to 0.9 ± 0.1 h(PL),24 ± 3 to 0.7 ± 0.1 h(GM),and 2.5 ± 0.01 to 0.3 ± 0.005 h(IS).Trichloroethylene(TCE)degradation half-lives at PL and GM decreased from 14.3 ± 3 to 0.2 ± 0.1 h(PL)and 7.6 ± 2 to 0.4 ± 0.1 h(GM).This acceleration of CHC degradation and the stronger shift toward reductive β-elimination reduced the concentration of potentially harmful metabolites with increasing temperatures.PCE and TCE degradation yields an activation energy of 28(IS),58 and 40 kJ mol~(-1)(GM),and 62 and 53 kJ mol~(-1)(PL).Hydrogen gas production by ZVI corrosion increased by 3 orders of magnitude from 10 to 70 ℃,and an increased chance of gas clogging was observed at high temperatures.

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