j********g
发帖数: 159 | 1 收到Invitation to review "Passivation of ZVI by Denitrifying Bacteria and
the Impact on Trichloroethene Reduction in Groundwater" (WST-EM121053)。
This is the abstract:
Zero-valent iron (ZVI) application in groundwater remediation is limited by
its vulnerability to passivation that significantly decreases its surface
reactivity. Both biological and chemical processes can potentially
passivate ZVI, although the understanding of biological passivation is
limited. This study was conducted in bench-scale reactors packed with
fresh ZVI or ZVI pre-exposed to nitrate (NO3-) and in the presence or
absence of a denitrifying bacterial enrichment (DNBE). The first-order rate
coefficients (k) for NO3- reduction by ZVI in the presence and absence of
DNBE were 0.20 and 0.09 s-1, respectively, suggesting that both ZVI and
microbes contribute to NO3- removal. Abiotic reduction of nitrate was
observed in reactors with trichloroethene (TCE) if ZVI was present; however,
it resulted in reduced rates of TCE reduction (k = 0.29 s-1) when compared
to reactors with fresh ZVI and no nitrate (k = 0.55 s-1). The TCE reduction
efficiency decreased by 49% (k =
0.15 s-1) in the presence of DNBE, suggesting that microbial growth or
catalyzed oxidation can inhibit TCE reduction by ZVI. Contrary to the
presumption that denitrification may decrease ZVI passivation by nitrate,
results from this study suggest that denitrifying bacteria actually
exacerbate ZVI passivation.
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