基乙烯物质 (以太PFAS) 的有氧生物转化和脱:基底特异性,途径和应用
Bosen Jin1, Yiwen Zhu1, Weiyang Zhao1
1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States.
概括
某些以太PFAS,如GenX,可以被微生物生物降解. 特定的结构特征使其能够分解,形成脱的中间体,有助于这些持久化学品的成本效益高的处理策略.
科学领域:
- 环境化学环境化学
- 环境微生物学 环境微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 醇基乙烯物质 (以太PFAS) 是一种未知环境持久性的新兴污染物.
- 一种以太PFAS的GenX是一种常见的酸替代品,是调节酸的目标.
- 了解以太PFAS的环境命运对于风险评估和管理至关重要.
研究的目的:
- 调查12个以太PFAS化合物的化学结构和生物降解性之间的关系.
- 为了确定活性污泥中以太PFAS生物转化机制.
- 探索将生物降解与先进的降解工艺相结合的潜力,以实现有效的PFAS处理.
主要方法:
- 在活性污泥群落中化12种不同的以太PFAS与碳酸基组.
- 生物转化途径的分析,包括氧化和水解性O-脱化.
- 识别中间产品和评估除过程.
- 综合性有氧生物转化/脱和先进还原处理列车的评估.
主要成果:
- 具有相邻的-CH2-部分或附近的C=C键的多化乙烯被积极生物转化.
- 生物转化通过以太键的氧化和水解O-脱化发生.
- 形成了不稳定的醇中间体,导致自发脱.
- 有氧生物转化/脱化可以补充先进的减少,以节省GenX和其他以太PFAS的成本.
结论:
- 以太PFAS的生物降解性严重依赖于特定的结构特征,特别是以太链接附近存在-CH2或C=C键.
- 微生物O-脱化启动了某些以太PFAS的分解,产生了经过脱的中间体.
- 将生物治疗与先进的降解相结合,为包括GenX.在内的反抗性乙烯PFAS的经济有效补救提供了一个有希望的战略.
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