Influence of different iron sources on Sb(III) removal from water by active iron-oxidizing bacteria and its mechanism

Water Science and Technology

卷:85

Liyuan Li¹  Jialing Liu¹  Yongchao Li¹  Zhonggeng Mo² 

[1] Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou 310023, P.R. China;

[2] School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, P.R. China;

关键词: ferrous lactate;    influence mechanism;    iron-oxidizing bacteria;    sb(iii) removal;    zero-valent iron;   

DOI  :  10.2166/wst.2022.069

来源: DOAJ

【 摘 要 】

Iron-oxidizing bacteria played an important role in the treatment of Sb-containing wastewater. In this study, effect of different iron sources on Sb(III) removal ability by isolated iron-oxidizing bacteria (named as IOB-L) was conducted systemically in batch experiment. Moreover, ferrous lactate and zero-valent iron were chosen as iron sources for IOB-L. The results showed that after inoculation of 2% volume of IOB-L, Sb(III) concentration in water decreased from initial 18 mg/L to 4.1 mg/L at optimal pH of 7.0. There was no reaction between Sb(III) and ferrous lactate, whereas corrosion product of iron can adsorb a certain amount of Sb. When active IOB-L cultivated in ferrous lactate, a better removal rate of Sb(III) can be reached with a longer stagnate phase for bacteria. However, Sb(III) removal ability of IOB-L using zero-valent iron as iron source was lower. SEM-EDS, FTIR, and XPS analysis further indicated that ferrous lactate was oxidized by IOB-L and precipitated as biogenic iron oxides which had strong adsorption ability towards Sb(III), whereas zero-valent iron was not a good iron source. HIGHLIGHTS IOB-L biomass had a little adsorption ability towards Sb(III).;Biogenic iron oxides was generated and played an important role in Sb removal from water.;Although ferrous lactate could be used as iron source for IOB-L, a longer adaptation period was necessary.;Ferrous ions from zero-valent iron corrosion was hard to be oxidized directly by IOB-L.;Oxidation of Sb(III) by biogenic iron oxides was not observed.;

【 授权许可】

Unknown