Department of Environmental Engineering, Zhejiang University, Hangzhou, 310058, China.
Environ Sci Pollut Res Int. 2013 Sep;20(9):6119-27. doi: 10.1007/s11356-013-1631-z. Epub 2013 Mar 28.
The combination of zero-valent iron (ZVI) with anaerobic sludge for enhancing reductive transformation and dechlorination of p-chloronitrobenzene (p-ClNB) was investigated in this study. p-ClNB was quickly reduced into p-chloroaniline (p-ClAn) and subsequently dechlorinated into aniline in the complex system, and the strengthening factor for pseudo-first-order transformation rate constant of p-ClNB (Q, k ZVI + sludge/(k sludge + k ZVI)) was above 3. The Q values for the different ZVI types with anaerobic sludge were as following: Reduced ZVI (RZVI) > Industrial ZVI > Nanoscale ZVI (NZVI). Thereinto, the aggregation of NZVI occurred, and its reaction activity declined. Furthermore, the increase of ZVI dosage promoted the p-ClNB transformation, but the p-ClAn dechlorination rate and Q value were not improved. With the anaerobic biomass increasing, the dechlorination rate of p-ClAn was significantly enhanced, and the Q value had positive relation with the mass ratio of anaerobic sludge to RZVI.
本研究考察了零价铁（ZVI）与厌氧污泥结合以增强对 p-氯硝基苯（p-ClNB）的还原转化和脱氯作用。在该复合体系中，p-ClNB 迅速被还原为对氯苯胺（p-ClAn），随后脱氯生成苯胺，p-ClNB 的准一级转化速率常数的强化因子（Q，k ZVI + sludge/（k sludge + k ZVI））大于 3。不同 ZVI 类型与厌氧污泥的 Q 值如下：还原态 ZVI（RZVI）>工业 ZVI>纳米 ZVI（NZVI）。其中，NZVI 发生团聚，反应活性下降。此外，增加 ZVI 用量可促进 p-ClNB 的转化，但 p-ClAn 的脱氯速率和 Q 值没有提高。随着厌氧生物量的增加，p-ClAn 的脱氯速率显著提高，且 Q 值与厌氧污泥与 RZVI 的质量比呈正相关。
