ZHANGZihao,LUZhili,MATengchong,et al.Enrichment of Per-and Polyfluoroalkyl Substances by Iron/Manganese Particles and Pipe-scale Composite Deposits in Drinking Water Distribution System[J].China Water & Wastewater,2026,42(3):53-58.
铁、锰颗粒物及其管网复合沉积物对PFASs的富集
- Title:
- Enrichment of Per-and Polyfluoroalkyl Substances by Iron/Manganese Particles and Pipe-scale Composite Deposits in Drinking Water Distribution System
- Keywords:
- drinking water; iron; manganese; pipe?scale deposit; per-and polyfluoroalkyl substances (PFASs); enrichment
- 摘要:
- 饮用水系统中存在着铁、锰等金属颗粒物及管网沉积物，可能会影响微量全氟烷基和多氟烷基物质（PFASs）在水中的迁移归趋。为此，选取全氟辛酸（PFOA）、全氟辛烷磺酸（PFOS）、全氟丁酸（PFBA）和全氟丁烷磺酸（PFBS）这4种典型PFASs作为代表，探讨铁、锰等金属颗粒物对微量PFASs的富集作用。结果表明，1 mg/L的铁、锰颗粒物（以铁、锰元素计）对200 ng/L的PFOA、PFOS、PFBS均有一定富集作用，其中PFOS富集率最高。当铁颗粒物浓度达到50 mg/L时，PFOA和PFBS的富集率分别为25.6%和48.3%，但PFBA的富集率仍较低（5.6%）。考虑到PFOA在环境中浓度较高，研究了铁、锰颗粒物在不同水质条件下对PFOA的富集作用。结果发现，水质条件会明显影响PFOA的富集，自来水体系中铁、锰颗粒物（含铝）对PFOA的富集率明显高于去离子水体系。长期运行的循环管道模拟实验也表明，管壁上累积的铁、锰复合沉积物（还含有铝、生物膜等）能显著富集PFOA，且管壁沉积物中单位质量金属颗粒物对PFOA的富集量远大于去离子水体系。
- Abstract:
- Iron and manganese particles, as well as other pipe-scale deposits, commonly exist in drinking water distribution systems. These substances can significantly influence the transport and fate of trace-level per-and polyfluoroalkyl substances (PFASs). In this study, four representative PFASs, namely perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), perfluorobutyric acid (PFBA), and perfluorobutanesulfonic acid (PFBS), were selected to investigate the enrichment behavior of trace PFASs by iron and manganese particles. The results demonstrated that at both iron and manganese particles with a concentration of 1 mg/L (expressed as Fe or Mn) exhibited certain enrichment effects on PFOA, PFOS, and PFBS at 200 ng/L, with PFOS showing the highest enrichment rate. When the iron particle concentration reached 50 mg/L, the enrichment rates for PFOA and PFBS were 25.6% and 48.3%, respectively, while that for PFBA remained relatively low (5.6%). Given the relatively high environmental prevalence of PFOA, its enrichment by iron and manganese particles under different water quality conditions was further examined. Water quality was found to markedly influence PFOA enrichment: iron and manganese particles (containing aluminum) in tap water showed significantly higher PFOA enrichment compared to those in deionized water. Long-term circulating pipe simulation experiments further revealed that composite pipe-scale deposits accumulated on pipe walls—containing iron, manganese, aluminum, and biofilm—could substantially enrich PFOA. Moreover, the PFOA enrichment capacity per unit mass of metal particles in these pipe?scale deposits was considerably greater than that observed in deionized water system.
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