Tetrabromobisphenol A (TBBPA), a common brominated flame retardant and a notorious pollutant in anaerobic environments, resists aerobic degradation but can undergo reductive dehalogenation to produce bisphenol A (BPA), an endocrine disruptor. Conversely, BPA is resistant to anaerobic biodegradation but susceptible to aerobic degradation. Microbial degradation of TBBPA via anoxic/oxic processes is scarcely documented. We established an anaerobic microcosm for TBBPA dehalogenation to BPA facilitated by humin. species increased with a growth yield of 1.5 × 10 cells per μmol Br released, suggesting their role in TBBPA dehalogenation. We innovatively achieved complete and sustainable biodegradation of TBBPA in sand/soil columns columns, synergizing TBBPA reductive dehalogenation by anaerobic functional microbiota and BPA aerobic oxidation by sp. strain TTNP3. Over 42 days, 95.11 % of the injected TBBPA in three batches was debrominated to BPA. Following injection of strain TTNP3 cells, 85.57 % of BPA was aerobically degraded. Aerobic BPA degradation column experiments also indicated that aeration and cell colonization significantly increased degradation rates. This treatment strategy provides valuable technical insights for complete TBBPA biodegradation and analogous contaminants.

中文翻译：

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通过连续厌氧还原脱卤和好氧氧化完全生物降解四溴双酚 A

四溴双酚 A (TBBPA) 是一种常见的溴化阻燃剂，也是厌氧环境中臭名昭著的污染物，它可以抵抗有氧降解，但可以进行还原脱卤，产生双酚 A (BPA)，一种内分泌干扰物。相反，BPA 能抵抗厌氧生物降解，但易受需氧降解影响。通过缺氧/有氧过程对 TBBPA 进行微生物降解的记录很少。我们建立了一个厌氧微观世界，用于胡敏素促进 TBBPA 脱卤为 BPA。每释放 1 μmol Br，物种数随着生长产量增加 1.5 × 10 个细胞而增加，表明它们在 TBBPA 脱卤中的作用。我们创新地实现了沙/土柱中TBBPA的完全、可持续的生物降解，协同厌氧功能微生物群的TBBPA还原脱卤和sp的BPA好氧氧化。菌株TTNP3。 42 天内，三批注射的 TBBPA 中有 95.11% 脱溴为 BPA。注射TTNP3株细胞后，85.57%的BPA被需氧降解。需氧 BPA 降解柱实验还表明，通气和细胞定植显着提高了降解率。这种处理策略为 TBBPA 和类似污染物的完全生物降解提供了宝贵的技术见解。