Temporal trends of perfluoroalkyl substances in limed biosolids from a large municipal water resource recovery facility
Temporal trends of perfluoroalkyl substances in limed biosolids from a large municipal water resource recovery facility
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DOI：
10.1016/j.jenvman.2015.09.023
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发表时间：
2016-01-01
影响因子：
8.7
通讯作者：
Torrents, Alba
中科院分区：
文献类型：
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作者：
Armstrong, Dana L.;Lozano, Nuria;Torrents, Alba
虽然通过土地应用回收废水生物固体是一种可持续的做法，用于养分回收和土壤改良，在世界范围内越来越普遍，但人们仍然担心这种做法可能成为环境中有毒持久性有机污染物的来源。本研究集中于评估的存在和时间趋势的12个全氟烷基物质（PFASs），污染物的全球后果，石灰类B生物固体从城市水资源回收设施（WRRF），也被称为污水处理厂。全氟辛烷磺酸因其在世界范围内的环境和生物样本中的广泛存在和持久性而受到严重关注，特别是人类血液样本。从2005年到2013年，在土地应用之前，大约每两到三个月从WRRF收集B类生物固体。总体而言，这项研究发现，7种可检测的PFAS化合物的浓度在8年期间保持不变，这一结果与污水污泥中这些化合物的其他时间研究一致。在这些分析的化合物中，研究期间观察到的全氟壬酸、全氟辛酸和全氟辛烷磺酸的最高平均浓度分别为25.1纳克/克干重、23.5纳克/克干重和22.5纳克/克干重，检测到的这些化合物的浓度比其余可检测的全氟辛烷磺酸高2.5-5倍。此外，还观察到，全氟辛烷磺酸在研究期间没有显示出总体变化，但在2006年底至2007年初出现了明显的浓度峰值。这项研究还表明，使用带有聚乙烯内衬盖的玻璃罐（一种常见的环境样品储存方法）不会影响存档生物固体样品中的PFOA和PFNA浓度。(C)2015爱思唯尔有限公司版权所有。
While the recycling of wastewater biosolids via land-application is a sustainable practice for nutrient recovery and soil reclamation that has become increasingly common worldwide, concerns remain that this practice may become a source of toxic, persistent organic pollutants to the environment. This study concentrates on assessing the presence and the temporal trends of 12 perfluoroalkyl substances (PFASs), pollutants of global consequence, in limed Class B biosolids from a municipal water resource recovery facility (WRRF), also know as a wastewater treatment plant. PFASs are of significant concern due to their extensive presence and persistence in environmental and biotic samples worldwide, most notably human blood samples. Class B biosolids were collected from the WRRF, prior to land-application, approximately every two to three months, from 2005 to 2013. Overall, this study found that concentrations of the 7 detectable PFAS compounds remained unchanged over the 8-year period, a result that is consistent with other temporal studies of these compounds in sewage sludges. From these analyzed compounds, the highest mean concentrations observed over the study period were 25.1 ng/g dw, 23.5 ng/g dw, and 22.5 ng/g dw for perfluorononanoic acid (PFNA), perfluorooctanoic acid (PFOA), and perfluorooctanesulfonic acid (PFOS), respectively, and these compounds were detected at concentrations 2.5-5 times higher than the remaining, detectable PFASs. Furthermore, it was observed that PFOS, while demonstrating no overall change during the study, exhibited a visible spike in concentration from late 2006 to early 2007.This study indicates that concentrations of PFASs in WRRFs have been stagnant over time, despite regulation. This study also demonstrates that the use of glass jars with polytetrafluoroethylene-lined lids, a common storage method for environmental samples, will not influence PFOA and PFNA concentrations in archived biosolids samples. (C) 2015 Elsevier Ltd. All rights reserved.