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<p>Arsenic (As) contamination of the environment, primarily from mining activities, crop residue, and manufacturing, is a significant global problem that requires practical solutions. This research aims to evaluate thermophilic metal-resistant strains of bacteria for the biological treatment of toxic arsenic. In addition, this study sheds light on the growth kinetics and&#xa0;molecular identification of potent bacterial strains. Three metal-resistant bacteria, designated as TA13, SA18, and GA16, were isolated and evaluated for their arsenic resistance and bio removal potential. The molecular analysis of these isolates was done by 16S rRNA sequencing, and these were identified as <i>Parageobacillus thermoglucosidasius</i> strain R-35637, <i>Geobacillus subterraneus</i> strain 34, and <i>Parageobacillus toebii</i> strain GT-02 with high similarity percentages of 99.17%, 98.97%, and 98.14%, respectively. The bioremediation rate and adopted removal mechanism of thermophilic strains were evaluated through Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Scanning Electron Microscopy (SEM). Among the strains, <i>Parageobacillus thermoglucosidasius</i> strain R-35637 demonstrated the highest arsenic biosorption rate (56.4%). This strain was isolated from the Tapt Kund hot spring, Badrinath Dham, Uttarakhand (India), a site of major religious significance. Therefore, this investigation can be considered as a novel, efficient, economically cheap, and sustainable method for metal treatment.</p>

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Environmental remediation of arsenic by thermophilic Parageobacillus and Geobacillus species: performance evaluation and characterisation

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Mamta Arya,
  • Anjali Patil,
  • Natarajan Rajamohan

摘要

Arsenic (As) contamination of the environment, primarily from mining activities, crop residue, and manufacturing, is a significant global problem that requires practical solutions. This research aims to evaluate thermophilic metal-resistant strains of bacteria for the biological treatment of toxic arsenic. In addition, this study sheds light on the growth kinetics and molecular identification of potent bacterial strains. Three metal-resistant bacteria, designated as TA13, SA18, and GA16, were isolated and evaluated for their arsenic resistance and bio removal potential. The molecular analysis of these isolates was done by 16S rRNA sequencing, and these were identified as Parageobacillus thermoglucosidasius strain R-35637, Geobacillus subterraneus strain 34, and Parageobacillus toebii strain GT-02 with high similarity percentages of 99.17%, 98.97%, and 98.14%, respectively. The bioremediation rate and adopted removal mechanism of thermophilic strains were evaluated through Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and Scanning Electron Microscopy (SEM). Among the strains, Parageobacillus thermoglucosidasius strain R-35637 demonstrated the highest arsenic biosorption rate (56.4%). This strain was isolated from the Tapt Kund hot spring, Badrinath Dham, Uttarakhand (India), a site of major religious significance. Therefore, this investigation can be considered as a novel, efficient, economically cheap, and sustainable method for metal treatment.