生物矿化
化学
胞外聚合物
细菌
钠
核化学
钙
嗜盐菌
环境化学
无机化学
化学工程
生物膜
有机化学
生物
遗传学
工程类
作者
Huaxiao Yan,Jiahao Cao,Minhan Teng,Long Meng,Lanmei Zhao,Xiangqun Chi,Zuozhen Han,Maurice E. Tucker,Hui Zhao
出处
期刊:Water Research
[Elsevier]
日期:2022-11-28
卷期号:229: 119438-119438
被引量:14
标识
DOI:10.1016/j.watres.2022.119438
摘要
Much attention has been paid to Ca2+ ion removal by biomineralization due to the dangers of Ca2+ on industrial processes and human health. However, Ca2+ removal from hypersaline water by biomineralization is quite difficult due to there being few halophilic bacteria tolerating higher salinities. In this study, free and immobilized Virgibacillus massiliensis C halophilic bacteria exhibiting carbonic anhydrase activity were used to remove Ca2+ ions from water at different NaCl concentrations. With increasing NaCl concentrations (10, 50, 100, 150 and 200 g/L), Ca2+ ion concentrations in the presence of free bacteria and in two groups of immobilized bacteria for a period of 6 days sharply decreased from 1200 mg/L to 219-562 mg/L, 71-214 mg/L and 21-159 mg/L, respectively; Ca2+ precipitation ratios were 55%-81%, 82%-94% and 87%-98%, respectively. The humic acid-like substances, protein, DNA and polysaccharide, released by the bacteria, promoted the Ca2+ ion removal. The immobilized bacteria were able to be recycled and precultured, which would save industry costs and increase Ca2+ ion removal efficiency. Biological processes for Ca2+ ion removal include cell surface, intracellular and extracellular biomineralization. The biogenesis of calcium carbonate was proved by SEM-EDS, FTIR, XPS and stable carbon isotope values. This study provides insights into the effective removal of Ca2+ ions by biomineralization in hypersaline water.
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