PFOA Increases Microbial Risk by Promoting Iron Release and Weakening Biofilm Adhesion in Unlined Iron Drinking Water Pipes
PFOA Increases Microbial Risk by Promoting Iron Release and Weakening Biofilm Adhesion in Unlined Iron Drinking Water Pipes
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DOI：
10.1021/acsestwater.3c00316
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发表时间：
2023-10
期刊：
影响因子：
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通讯作者：
Zhuang Yuan;Donghan Li;Yilong Hua;Baoyou Shi
中科院分区：
文献类型：
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作者：
Zhuang Yuan;Donghan Li;Yilong Hua;Baoyou Shi
全氟辛酸（PFOA）进入饮用水分配系统（DWDS）会引发复杂的过程，影响用户水龙头的水质。在这里，我们首次发现PFOA可以通过触发高铁释放或降低生物膜粘附能力大大增加微生物风险，这取决于无衬里铁管中PFOA的浓度水平。TP（无PFOA，对照）、TP100 （PFOA 100 ng/L，中等浓度）和TP1000 （PFOA 1000 ng/L，高浓度）三种情况下的异养板计数（HPC）分别为180、692和192 CFU/mL，对应的总铁浓度分别为0.67、1.84和0.26 mg/L。显然，PFOA促进了TP100的铁释放，抑制了TP1000的铁释放，TP100的最高HPC与其最高铁释放一致。值得注意的是，TP1000的铁释放量最低，但其HPC是第二高的。胞外聚合物（EPS）组成分析表明，PFOA刺激了EPS的产生，但降低了多糖/蛋白质和碳水化合物/蛋白质的比例，表明PFOA降低了TP1000生物膜的粘附能力，这是TP1000较高的HPC的原因。该研究为DWDS中与PFOA相关的水质风险提供了新的见解。
Perfluorooctanoic acid (PFOA) entering drinking water distribution system (DWDS) could induce complex processes affecting the water quality at consumer taps. Here, we first found that PFOA could greatly increase microbial risk by triggering high iron release or reducing the biofilm adhesive ability depending on the concentration levels of PFOA in unlined iron pipes. The heterotrophic plate counts (HPC) of three scenarios TP (without PFOA, control), TP100 (PFOA 100 ng/L, moderate concentration), and TP1000 (PFOA 1000 ng/L, high concentration) were 180, 692, and 192 CFU/mL, and the corresponding total iron concentrations were 0.67, 1.84, and 0.26 mg/L, respectively. Obviously, PFOA enhanced iron release in TP100 but inhibited iron release in TP1000, and the highest HPC in TP100 was in accordance with its highest iron release. Notably, TP1000 had the lowest iron release, but its HPC was the second highest. The extracellular polymeric substance (EPS) composition analysis revealed that PFOA stimulated EPS production but decreased the ratios of polysaccharides/proteins and carbohydrates/proteins, indicating that the biofilm adhesion ability was reduced due to PFOA, which was accountable for the relatively higher HPC in TP1000. This study provided new insights into the water quality risks associated with PFOA in DWDS.