Abstract Textile industry wastewater comprises refractory components, such as highly toxic dyes and hexavalent chromium (Cr(VI)). Aeromonas hydrophila LZ-MG14 was isolated and characterized to develop an effective bioaugmentation strategy for the bioremediation of malachite green (MG) and Cr(VI) from textile wastewater. Strain LZ-MG14 removed 96.8% of MG (200 mg L−1) and 93.71% of Cr(VI) (0.5 mmol L−1) within 12 h with a significant increase in biomass. The mechanism underlying MG mineralization by LZ-MG14 involved N-demethylation and decomposition of conjugated structure, while that underlying Cr(VI) removal was reduction. LZ-MG14 bioaugmentation in a membrane bioreactor (MBR) significantly enhanced the efficiency of MG degradation and Cr(VI) removal in textile wastewater. Additionally, LZ-MG14 successfully colonized the activated sludge and shaped the effective microbiota for MG degradation and Cr(VI) removal. LZ-MG14 bioaugmentation can be potentially used for MG degradation and Cr(VI) removal in the textile wastewater.

中文翻译：

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用嗜水气单胞菌 LZ-MG14 生物强化膜生物反应器以提高纺织废水中孔雀石绿和六价铬的去除率

摘要 纺织工业废水含有剧毒染料和六价铬（Cr(VI)）等难降解成分。分离和表征嗜水气单胞菌 LZ-MG14，以开发一种有效的生物强化策略，用于纺织废水中孔雀石绿 (MG) 和 Cr(VI) 的生物修复。菌株 LZ-MG14 在 12 小时内去除了 96.8% 的 MG（200 mg L-1）和 93.71% 的 Cr（VI）（0.5 mmol L-1），生物量显着增加。LZ-MG14 MG 矿化的机制涉及N-去甲基化和共轭结构的分解，而Cr(VI) 去除的潜在机制是还原。LZ-MG14 在膜生物反应器 (MBR) 中的生物强化显着提高了纺织废水中 MG 的降解和 Cr(VI) 去除效率。此外，LZ-MG14 成功地定殖了活性污泥，并形成了有效的微生物群，用于 MG 降解和 Cr(VI) 去除。LZ-MG14 生物强化可潜在用于纺织废水中的 MG 降解和 Cr(VI) 去除。