Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 21, Issue 22, Pages 12747-12756Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-3215-y
Keywords
Zero-valent iron (ZVI); Anaerobic sludge; p-Chloronitrobenzene (p-ClNB); Reductive transformation; Corrosion product
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Funding
- National Natural Science Foundation of China [50778158, 51378454]
- National Key Technologies Research and Development Program of China [2013BAC16B04]
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The zero-valent iron (ZVI) corrosion products and their functions were investigated in the combined ZVI and anaerobic sludge system. Results showed that ZVI corrosion occurred, and the reductive transformation and dechlorination of p-chloronitrobenzene (p-ClNB) by the anaerobic sludge were enhanced. In the combined systems with different types of ZVIs and mass ratios of anaerobic sludge to ZVI, a considerable amount of suspended iron compounds was produced and coated onto the microbial cells. However, the microbial cellular structure was damaged, and the p-ClNB reductive transformation was affected adversely after the long-term presence of nanoscale ZVI (NZVI) or reduced ZVI (RZVI) with a high concentration of 5 g L-1. The oxidized products of FeOOH and Fe3O4 were found on the surface of ZVI, which are speculated to act as electron mediators and consequently facilitate the utilization of electron donors by the anaerobic microbes.
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