Efficient hexabromocyclododecane-biodegrading microorganisms isolated in Taiwan. (May 2021)

• Record Type: Journal Article
• Authors: Chou, Tzu-Ho; Li, Yi-Jie; Ko, Chi-Fong; Wu, Tien-Yu; Shih, Yang-hsin
• Is Part Of: Chemosphere. Volume 271(2021)
• Publication Date: 2021-05
• Subjects: Bioremediation -- Bacillus cereus -- Hexabromocyclododecane -- Persistent organic pollutants; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.129544
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The potential toxicity of hexabromocyclododecane (HBCD), its persistence in the environment, and its high bioaccumulation characteristics pose a need to remediate HBCD in the environment. Bacillus cereus and B. subtilis species complexes we isolated from Taiwan soil are capable of degrading HBCD. B. cereus can degrade HBCD with a half-life only 0.911 days. The highest efficiency of HBCD degradation by B. cereus was achieved at pH 7.0, 35 °C, and 0.10 ppm HBCD. The removal mechanism of HBCD by B. cereus is debromination and its pathway was proposed. The addition of surfactant Tween 60 improved HBCD removal but the addition of CaO2, slow-releasing oxygen, did not. These findings can facilitate the bioremediation of HBCD in the environment. Graphical abstract: Image 1 Highlights: Three Bacillus strains can degrade HBCD within a half-live of 0.91–1.34 day. Bacillus cereus and Bacillus subtilis species complex were identified. B. cereus efficiently degraded HBCD at 35 °C, pH 7.0, and 0.10 ppm HBCD. The fungi we examined can remove HBCD quickly by sorption. The debromination is the main mechanism for B. cereus to degrade HBCD.