• reductive transformation of pentachloronitrobenzene by zero-valent iron and mixed anaerobic culture

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 547
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     the simultaneous pentachloronitrobenzene (p-cnb) reduction by both zero-valent iron (zvi) and microorganisms was investigated through batch experiments. compared to the mono-iron system, the bio-iron system showed more sufficient p-cnb removal capacity. a p-cnb removal rate of 94.2% and 59.8% was obtained in the bio-iron system and the mono-iron system with a corresponding pentachloroaniline (p-can) recovery rate of 59.4% and 29.8%, respectively. the p-cnb removal rate increased significantly from 26.9% to 92.2% with an increase of iron dosage from 0 to 3.0 g l−1. the results also showed that the maximum p-cnb removal rate and corresponding p-can recovery rate were 95.6% and 56.4% at an initial ph of 6.0, while lower ph values would inhibit the removal of p-cnb in this combined system. it is found that organic substrates can improve the p-cnb removal rate, among which ethanol was found to be the most effective electron donor for this bio-iron system and the corresponding p-cnb removal rate in presence of ethanol was 98.2%. common electron acceptors in groundwater were found to inhibit the reduction of p  -cnb in the following order: no-3˃so2-4˃o2and it suggested that sulfate and oxygen exert limited inhibition effects on the reduction.

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