Pilot-scale comparison of granular activated carbons, ion exchange, and alternative adsorbents for per- and polyfluoroalkyl substances removal

AWWA water science Pub Date : 2022-10-06 DOI:10.1002/aws2.1308

Ricardo Medina, Manmeet W. Pannu, Scott A. Grieco, Michael Hwang, Christine Pham, Megan H. Plumlee

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引用次数: 6

Abstract

Eight granular activated carbons (GAC), four anion exchange (IX) resins, and two alternative adsorbents (AAs) were tested for the removal of per- and polyfluoroalkyl substances (PFAS) from a groundwater source used for drinking water. The study was conducted using pilot(meter)-scale columns operated in continuous-flow mode for 16–26 months. Comparison between GAC adsorbents showed that bituminous GACs exhibited higher adsorption than non-/sub-bituminous GACs. Testing of a reactivated and new GAC showed no significant differences with respect to PFAS adsorption. Of the four IX resins tested, one resin showed superior adsorption when compared with all three IX resins. A surface-modified bentonite adsorbent showed superior removal efficiencies over all adsorbent types tested here. These results provide benchmark performance and adsorption capacities at pilot-scale for various adsorbents and highlight the promise of AAs to remove PFAS from water sources with low (ng/L) concentrations.

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颗粒活性炭、离子交换和替代吸附剂去除全氟烷基和多氟烷基物质的中试规模比较

采用八种颗粒活性炭(GAC)、四种阴离子交换树脂(IX)和两种替代吸附剂(AAs)对饮用水地下水中全氟烷基和多氟烷基物质(PFAS)的去除效果进行了测试。该研究使用中试(米)规模的色谱柱在连续流模式下运行了16-26个月。对GAC吸附剂的比较表明，沥青GAC比非/亚沥青GAC具有更高的吸附性。重新活化的GAC和新的GAC的测试显示，在PFAS吸附方面没有显著差异。在所测试的四种IX树脂中，一种树脂的吸附性能优于三种IX树脂。一种表面改性的膨润土吸附剂在所有类型的吸附剂中表现出优越的去除效率。这些结果为各种吸附剂提供了中试规模的基准性能和吸附能力，并突出了AAs从低浓度(ng/L)水源中去除PFAS的前景。

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来源期刊

AWWA water science

CiteScore

4.40

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0.00%

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