Influence of microbial weathering on the partitioning of per- and polyfluoroalkyl substances (PFAS) in biosolids
Influence of microbial weathering on the partitioning of per- and polyfluoroalkyl substances (PFAS) in biosolids
复制标题
微生物风化对生物固体中全氟烷基物质和多氟烷基物质 (PFAS) 分配的影响
DOI：
10.1039/d2em00350c
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Sales, Christopher M.
中科院分区：
文献类型：
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作者：
Lewis, Asa J.;Ebrahimi, Farshad;McKenzie, Erica R.;Suri, Rominder;Sales, Christopher M.
全氟烷基和多氟烷基物质（PFAS）是一大类人造含氟有机化学品，可在环境中积累。在水资源回收设施（WRRF）中，一些常见的检测PFAS往往会分配到并集中在生物固体中，它们可以作为生态受体的来源，并可能在土地应用时渗入地下水。虽然生物固体在土地应用之前经历了一些稳定化以减少病原体，但它们仍然含有许多微生物，有助于生物固体的不同成分的最终分解。这项工作展示了微生物风化可以影响生物固体分解，降解PFAS，并在小规模，受控的实验室实验中影响PFAS分区的方式。在微生物风化实验中，化合物特定的PFAS生物固体-水分配系数（Kd）被证明在91天的研究过程中平均降低0.4个对数，在前10天发生最快的变化。此外，在同一时间内，脂质、蛋白质和有机物的去除率最高。在评价的自变量中，统计分析表明，影响PFAS分区的最显著的固体特性是有机物、蛋白质、脂质和有机物的分子量。建立了一个多元线性回归模型，预测PFAS分配行为的生物固体的固体特性的基础上的生物固体和PFAS特性的R2值为0.7391时，绘制预测和测量的log Kd。 这项工作的结果表明，微生物风化可以发挥重要的作用，在最终的命运和运输PFAS及其前体从生物固体。
Per- and polyfluoroalkyl substances (PFAS) are a large group of man-made fluorinated organic chemicals that can accumulate in the environment. In water resource recovery facilities (WRRFs), some commonly detected PFAS tend to partition to and concentrate in biosolids where they can act as a source to ecological receptors and may leach to groundwater when land-applied. Although biosolids undergo some stabilization to reduce pathogens before land application, they still contain many microorganisms, contributing to the eventual decomposition of different components of the biosolids. This work demonstrates ways in which microbial weathering can influence biosolids decomposition, degrade PFAS, and impact PFAS partitioning in small-scale, controlled laboratory experiments. In the microbial weathering experiments, compound-specific PFAS biosolids–water partitioning coefficients (Kd) were demonstrated to decrease, on average, 0.4 logs over the course of the 91 day study, with the most rapid changes occurring during the first 10 days. Additionally, the highest rates of lipid, protein, and organic matter removal occurred during the same time. Among the evaluated independent variables, statistical analyses demonstrated that the most significant solids characteristics that impacted PFAS partitioning were organic matter, proteins, lipids, and molecular weight of organics. A multiple linear regression model was built to predict PFAS partitioning behavior in biosolids based on solid characteristics of the biosolids and PFAS characteristics with a R2 value of 0.7391 when plotting predicted and measured log Kd. The findings from this work reveal that microbial weathering can play a significant role in the eventual fate and transport of PFAS and their precursors from biosolids.