期刊
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
卷 115, 期 -, 页码 148-155出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2016.08.007
关键词
Antimony; Wastewater; Sulfate-reducing bacteria; Bioremediation
资金
- China National Natural Science Foundation [41273150, 40973084]
- State Key Laboratory of Environmental Geochemistry [SKLEG2015402]
Bioremediation of metal(loid)-contaminated water could be a cost-effective process. In this work, Sb-polluted water was treated by application of a mixed batch culture of sulfate-reducing bacteria (SRB). Aqueous Sb could be efficiently removed by the SRB over an initial pH range 5-8. The SRB was tolerant of at least 50 mg L-1 Sb in solution. With an initial pentavalent Sb (Sb(V)) concentration of 5 mg L-1, batch kinetic variations of the treatment were studied over a 11 d period at an initial pH 7 at 30 degrees C. A high removal (93%) of the aqueous Sb was achieved. The final products were identified microscopically. Before removal of Sb from solution in this treatment, Sb(V) was first reduced to trivalent Sb (Sb(III)). Hydrogen sulfide was proven to be the reducing agent in this reaction. The SRB were not able to reduce Sb(V) enzymatically. Following the chemical reduction of Sb(V) to Sb(III), the latter reacted with excess sulfide, resulting in the formation of insoluble antimony sulfide (Sb2S3). Studies on the sorption of Sb species by dead SRB indicated that, in the batch treatment, sorption by bacteria made a relatively small contribution to the removal of Sb. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据