文献类型：期刊文献

英文题名：Enhanced removal of chromium(vi) by Fe(iii)-reducing bacterium coated ZVI for wastewater treatment: batch and column experiments

作者：Zheng, Bin[1];Ye, Yizi[2];Hu, Baowei[2];Luo, Chunhui[2];Zhu, Yuling[2]

机构：[1]Nanjing Forestry Univ, Coll Econ & Management, 159 Longpan Rd, Nanjing 210037, Jiangsu, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2019

卷号：9

期号：62

起止页码：36144

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000497825500027)、、EI(收录号：20194707704659)、Scopus(收录号：2-s2.0-85075021516)、WOS

基金：Project Supported by the National Natural Science Foundation of China (Grant No. 71603118).

语种：英文

外文关键词：Bacteria - Biomineralization - Chemicals removal (water treatment) - Chromium compounds - Chromium metallography - Iron metallography - Wastewater treatment - X ray photoelectron spectroscopy

外文摘要：In order to effectively destroy the structure of the passive oxidation film that covers zero-valent iron (ZVI), an Fe(iii)-reducing strain, namely Morganella sp., was isolated from anaerobic activated sludge and coated on ZVI, which was distributed in porous ceramsite made of iron dust, kaolin and straw, with a ratio of 7 : 3 : 1. Batch experiments showed that under the optimized conditions, the maximum removal amount of Cr(vi) by ZVI increased from 7.33 mg g(-1) to 26.87 mg g(-1) in the presence of the Fe(iii)-reducing bacterium. The column experiment was performed with the addition of the agar globules to supply nutrients to the strain. Compared with ZVI, the column penetration time and maximum capture amount of RB-ZVI increased to 17 h and 112.5 mg g(-1), respectively, on the 15(th) day. Furthermore, the service life of RB-ZVI was prolonged in the existence of the strain. Based on X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy analyses, the key mechanisms for the removal of Cr(vi) by ZVI coated with Fe(iii)-reducing bacterium were determined to be adsorption, reduction, coprecipitation and biomineralization.