University of Florida, Department of Environmental Engineering Sciences, College of Engineering, Gainesville, FL 32611, USA.
University of Florida, Department of Environmental Engineering Sciences, College of Engineering, Gainesville, FL 32611, USA; University of Florida, Center for Environmental and Human Toxicology, Department of Physiological Sciences, College of Veterinary Medicine, Gainesville, FL 32610, USA.
J Hazard Mater. 2023 Apr 15;448:130926. doi: 10.1016/j.jhazmat.2023.130926. Epub 2023 Feb 1.
While per- and polyfluoroalkyl substances (PFAS) have been reported extensively in municipal solid waste (MSW) landfill leachate,they have rarely been quantified in landfill gas or in discrete landfill liquids such as landfill gas condensate (LGC), and the potential for PFAS to partition to the condensate has not been reported. LGC and leachate collected from within gas wells known as gas well pump-out (GWP) from three MSW landfills underwent physical-chemical characterization and PFAS analysis to improve understanding of the conditions under which these liquids form and to illuminate PFAS behavior within landfills. LGC was observed to be clear liquid containing ammonia and alkalinity while GWP strongly resembled leachate - dark in color, high in chloride and ammonia. Notably, arsenic and antimony were found in concentrations exceeding regulatory thresholds by over two orders of magnitude in many LGC samples. LGC contained a lower average concentration of ΣPFAS (19,000 ng L) compared to GWP (56,000 ng L); however, LGC contained more diversity of PFAS, with 53 quantified compared to 44 in GWP. LGC contained proportionally more precursor PFAS than GWP, including more semi-volatile PFAS which are rarely measured in water matrices, such as fluorotelomer alcohols and perfluoroalkane sulfonamido ethanols. This study provides the first detailed comparison of these matrices to inform timely leachate management decisions.
虽然全氟和多氟烷基物质 (PFAS) 在城市固体废物 (MSW) 垃圾填埋场渗滤液中已被广泛报道，但它们在垃圾填埋气中或在离散的填埋液（如填埋气冷凝物 (LGC)）中很少被定量检测到，而且 PFAS 有可能分配到冷凝物中也尚未有报道。从三个 MSW 垃圾填埋场中的气体井中收集的 LGC 和渗滤液（称为气井泵出 (GWP)）进行了物理化学特性和 PFAS 分析，以提高对这些液体形成条件的认识，并阐明填埋场内 PFAS 的行为。LGC 是一种含有氨和碱度的清澈液体，而 GWP 则与渗滤液非常相似 - 颜色深、氯化物和氨含量高。值得注意的是，许多 LGC 样品中的砷和锑浓度超过监管阈值两个数量级以上。与 GWP（56,000ng/L）相比，LGC 中ΣPFAS（19,000ng/L）的平均浓度较低；然而，LGC 中 PFAS 的种类更多，有 53 种被定量检测到，而 GWP 中只有 44 种。LGC 中比 GWP 中含有更多的前体 PFAS，包括在水基质中很少测量的半挥发性 PFAS，如氟调聚物醇和全氟烷基亚磺酰胺乙醇。本研究首次对这些基质进行了详细比较，为及时做出渗滤液管理决策提供了信息。
