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Keywords = antimonate-reducing bacteria

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14 pages, 4319 KiB  
Article
Behavior and Mechanisms of Antimony Precipitation from Wastewater by Sulfate-Reducing Bacteria Desulfovibrio desulfuricans
by Fan Zhuang, Xiaowu Xiang, Jin Hu, Jing Xiong, Teng Zhang, Lei Zhou, Guoping Jiang, Min Zhang, Zhenghua Liu, Huaqun Yin, Ling Xia, Ibrahim Ahmed Ibrahim Mahmoud and Delong Meng
Toxics 2025, 13(1), 17; https://doi.org/10.3390/toxics13010017 - 26 Dec 2024
Cited by 1 | Viewed by 1290
Abstract
The development of the non-ferrous metal industry is generating increasingly large quantities of wastewater containing heavy metals (e.g., Sb). The precipitation of heavy metals by microorganisms involves complex mechanisms that require further investigation to optimize bioremediation technologies. In this study, we employed a [...] Read more.
The development of the non-ferrous metal industry is generating increasingly large quantities of wastewater containing heavy metals (e.g., Sb). The precipitation of heavy metals by microorganisms involves complex mechanisms that require further investigation to optimize bioremediation technologies. In this study, we employed a sulfate-reducing bacteria (SRB) strain Desulfovibrio desulfuricans CSU_dl to treat the antimony (Sb)-containing wastewater; the behavior of Sb and mechanisms underlying precipitation were investigated by characterizing the precipitates. The results showed that the abiotic factors constraining SRB bacterial growth greatly affect Sb forms and precipitation. For instance, Sb precipitation maximumly occurred at pH 6 and 7, or C:N ratio of 10:1 and 40:3 for Sb(III) and Sb(V), respectively, resulting in a maximum Sb removal rate of 94%. Interestingly, we found that substantial antimonate and antimonite were adsorbed on the SRB cell surface, indicating that cell surface is a critical reaction site of Sb transformation and precipitation. Sb was adsorbed to the cell surface by C-C and C=O groups, and was further precipitated by forming Sb2S3 and Sb2S5 or was coprecipitated with the P-containing group. Partial Sb(V) reduction was also observed on the SRB cell surface. These results provided a deep insight into the Sb bio-transformation and were an advancement with respect to understanding bioremediation of Sb-contaminated wastewater. Full article
(This article belongs to the Special Issue Integrated Remediation Processes toward Heavy Metal-Contaminated Environment)
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11 pages, 2442 KiB  
Article
Characterization of a Moderately Halotolerant Antimony-Removing Desulfovibrio sp. Strain Isolated from Landfill Leachate
by Chinh Thi Kieu Pham, Kazuko Sawada and Satoshi Soda
Water 2023, 15(22), 3872; https://doi.org/10.3390/w15223872 - 7 Nov 2023
Cited by 5 | Viewed by 1855
Abstract
Antimony (Sb) is a harmful contaminant posing a risk to the environment and human health. Antimony-containing industrial wastewater often contains sulfate; therefore, it is suitable to apply sulfate-reducing bacteria (SRB) to remove Sb from such water. SRB anaerobically reduce sulfate to sulfide. Sb(V) [...] Read more.
Antimony (Sb) is a harmful contaminant posing a risk to the environment and human health. Antimony-containing industrial wastewater often contains sulfate; therefore, it is suitable to apply sulfate-reducing bacteria (SRB) to remove Sb from such water. SRB anaerobically reduce sulfate to sulfide. Sb(V) is then reduced to Sb(III) by sulfide to produce an antimony trisulfide (Sb2S3) precipitate. This wastewater often exhibits a high salinity, which inhibits biological reactions. This study aimed to isolate and characterize a halotolerant bacterium capable of removing Sb from wastewater. A Desulfovibrio sp. strain was isolated from a mixed bacterial culture derived from a leachate sample from the Nam Son landfill in Vietnam. The isolated strain, NSLLH1b, removed 86% of the 50 mg/L of Sb(V) in 3 days at 180 mg/L of sulfate and 360 mg-C/L of lactate, at a pH of 7.0 and at 28 °C. It anaerobically removed >80% of the Sb(V) at 12.5–100 mg/L in 14 days at initial concentrations of >100 mg/L of sulfate, >250 mg-CL of lactate, and 0.2–15 g/L of NaCl, and a pH of 5–8, resulting in orange precipitation. An analysis using scanning electron microscopy–energy-dispersive X-ray spectroscopy confirmed that the precipitation consisted mainly of Sb and sulfur, supposedly as Sb2S3. This moderately halotolerant bacterium can be used for simultaneously removing Sb and sulfate from wastewater. Full article
(This article belongs to the Section Wastewater Treatment and Reuse)
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12 pages, 2071 KiB  
Article
Isolation and Characterization of Facultative-Anaerobic Antimonate-Reducing Bacteria
by Ziran Yang, Hisaaki Hosokawa, Takuya Sadakane, Masashi Kuroda, Daisuke Inoue, Hiroshi Nishikawa and Michihiko Ike
Microorganisms 2020, 8(9), 1435; https://doi.org/10.3390/microorganisms8091435 - 18 Sep 2020
Cited by 13 | Viewed by 4514
Abstract
Microbial antimonate (Sb(V)) reduction is a promising approach to remove Sb(V) from wastewater. However, current knowledge regarding microbial Sb(V) reduction is limited to strictly anaerobic conditions. This study was the first to isolate three facultative-anaerobic Sb(V)-reducing bacterial strains from the sludge collected from [...] Read more.
Microbial antimonate (Sb(V)) reduction is a promising approach to remove Sb(V) from wastewater. However, current knowledge regarding microbial Sb(V) reduction is limited to strictly anaerobic conditions. This study was the first to isolate three facultative-anaerobic Sb(V)-reducing bacterial strains from the sludge collected from a wastewater treatment facility in an antimony products plant. Two of the isolated strains, designated Dechloromonas sp. AR-2 and Propionivibrio sp. AR-3, were characterized based on their Sb(V)-reducing abilities. When cultivated under anaerobic conditions with Sb(V) and acetate as the electron acceptor and donor, respectively, both strains could efficiently reduce 5.0 mM Sb(V), removing most of it from the water phase within 7 d. Along with Sb(V) reduction by the strains, white precipitates, which were likely amorphous Sb(OH)3 solids, were formed with a minor generation of soluble antimonite. Additionally, respiratory Sb(V) reduction by both strains occurred not only under anaerobic but also microaerobic conditions. It was suggested that Sb(V) reduction and the growth abilities of the strains under microaerobic conditions presented a substantial advantage of the use of strains AR-2 and AR-3 for practical applications to Sb(V)-containing wastewater treatment. Full article
(This article belongs to the Section Environmental Microbiology)
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