首页|Interaction of Ca2+and Fe3+in co-precipitation process induced by Virgibacillus dokdonensis and its application

Interaction of Ca2+and Fe3+in co-precipitation process induced by Virgibacillus dokdonensis and its application

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Interaction of Ca2+and Fe3+in co-precipitation process induced by Virgibacillus dokdonensis and its application
Biomineralization has garnered significant attention in the field of wastewater treatment due to its notable cost reduction compared to conventional methods.The reinjection water from oilfields containing an exceedingly high concentration of calcium and ferric ions will pose a major hazard in production.However,the utilization of biomineralization for precip-itating these ions has been scarcely investigated due to limited tolerance among halophiles towards such extreme conditions.In this study,free and immobilized halophiles Virgibacillus dokdonensis were used to precipitate these ions and the effects were compared,at the same time,biomineralization mechanisms and mineral characteristics were further explored.The results show that bacterial concentration and carbonic anhydrase activity were higher when additionally adding ferric ion based on calcium ion;the content of protein,polysaccharides,deoxyribonucleic acid and humic substances in the extracellular polymers also increased compared to control.Calcium ions were biomineralized into calcite and vaterite with mul-tiple morphology.Due to iron doping,the crystallinity and thermal stability of calcium car-bonate decreased,the content of O-C=O,N-C=O and C-O-PO3 increased,the stable carbon isotope values became much more negative,and β-sheet in minerals disappeared.Higher calcium concentrations facilitated ferric ion precipitation,while ferric ions hindered cal-cium precipitation.The immobilized bacteria performed better in ferric ion removal,with a precipitation ratio exceeding 90％.Free bacteria performed better in calcium removal,and the precipitation ratio reached a maximum of 56％.This research maybe provides some ref-erence for the co-removal of calcium and ferric ions from the oilfield wastewater.

Calcium carbonateCalcium ionFerric ionBiomineralizationCo-removalImmobilization

Huaxiao Yan、Yuping Liu、Haojuan Zhang、Shengping Jin、Zuozhen Han、Jusun Woo、Maurice E.Tucker、Long Meng、Xiangqun Chi、Chao Han、Yanyang Zhao、Yueming Zhao、Hui Zhao

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College of Chemical and Biological Engineering,College of Earth Science and Engineering,Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals,Shandong University of Science and Technology,Qingdao 266590,China

Laboratory for Marine Mineral Resources,Center for Isotope Geochemistry and Geochronology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China

School of Earth and Environmental Sciences,Seoul National University,Seoul 08826,Korea

School of Earth Sciences,University of Bristol,Bristol BS8 1RJ,UK

Cabot Institute,University of Bristol,Cantock's Close,Bristol BS8 1UJ,UK

Qingdao West Coast New District First High School,Qingdao 266555,China

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Calcium carbonate Calcium ion Ferric ion Biomineralization Co-removal Immobilization

2025

10.1016/j.jes.2023.10.014

环境科学学报(英文版)
中科院生态环境研究中心

环境科学学报(英文版)

影响因子：0.862
ISSN：1001-0742
年,卷(期)：2025.147(1)