Namuun Ganbat , Ali Altaee , Faris M. Hamdi , John Zhou , Mahedy Hasan Chowdhury , Syed Javaid Zaidi , Akshaya K. Samal , Raed Almalki , Marie Joshua Tapas
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Experimental results showed the accumulation of PFOA near the cathode region in FeAC PRB tests, hypothesising that Fe from the PRB formed a complex with PFOA ions and transported it to the cathode region. Spent PRBs were regenerated with methanol for PFOA extraction and reuse in the EK experiments. Although FeAC PRB achieved better PFOA removal than AC PRB, the EK tests with regenerated AC-EK and FeAC-EK PRBs achieved 40.37 % and 20.62 % PFOA removal. For EK with FeAC PRB near the anode, PFOA removal was 21.96 %. Overall, using PRB in conjunction with the EK process can further enhance the removal efficiency. This concept could be applied to enhance the removal of various PFAS compounds from contaminated soils by combining a suitable PRB with the EK process. It also emphasizes the feasibility of in-situ soil remediation technologies for forever chemical treatment.</p></div>","PeriodicalId":15530,"journal":{"name":"Journal of contaminant hydrology","volume":"267 ","pages":"Article 104425"},"PeriodicalIF":3.5000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0169772224001293/pdfft?md5=22fcb0b9bc9e3b03836cf77a13641899&pid=1-s2.0-S0169772224001293-main.pdf","citationCount":"0","resultStr":"{\"title\":\"PFOA remediation from kaolinite soil by electrokinetic process coupled with activated carbon/iron coated activated carbon - permeable reactive barrier\",\"authors\":\"Namuun Ganbat , Ali Altaee , Faris M. Hamdi , John Zhou , Mahedy Hasan Chowdhury , Syed Javaid Zaidi , Akshaya K. 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引用次数: 0
摘要
本研究采用电动力(EK)原位土壤修复技术去除高岭石土壤中的全氟辛酸(PFOA)。在高岭石土壤中添加 10 mg/kg PFOA,使用胆酸钠生物表面活性剂和活性炭(AC)或铁涂层活性炭(FeAC)渗透反应屏障(PRB)进行电动力处理。该研究还评估了活性炭和铁涂层活性炭阻隔层的位置对 EK 工艺性能的影响。在中间部分设有 PRB 的 EK 试验中,AC-EK 试验对高岭石中全氟辛烷磺酸的去除率为 52.35%,而 FeAC-EK 试验对高岭石中全氟辛烷磺酸的去除率为 59.55%。实验结果表明,在 FeAC PRB 试验中,PFOA 在阴极区附近积累,假设 PRB 中的铁与 PFOA 离子形成络合物,并将其输送到阴极区。用甲醇对用过的 PRB 进行再生,以提取 PFOA 并在 EK 实验中重复使用。虽然 FeAC PRB 的 PFOA 去除效果优于 AC PRB,但使用再生的 AC-EK 和 FeAC-EK PRB 进行的 EK 试验的 PFOA 去除率分别为 40.37% 和 20.62%。在阳极附近使用 FeAC PRB 的电解槽试验中,PFOA 去除率为 21.96%。总之,将 PRB 与 EK 工艺结合使用可进一步提高去除效率。通过将合适的 PRB 与 EK 工艺相结合,这一概念可用于提高受污染土壤中各种 PFAS 化合物的去除率。这也强调了原位土壤修复技术在永久性化学处理方面的可行性。
PFOA remediation from kaolinite soil by electrokinetic process coupled with activated carbon/iron coated activated carbon - permeable reactive barrier
This study applied electrokinetic (EK) in situ soil remediation for perfluorooctanoic acid (PFOA) removal from kaolinite soil. The kaolinite soil was spiked with 10 mg/kg PFOA for the EK treatment using Sodium Cholate bio-surfactant coupled with Activated Carbon (AC) or iron-coated Activated Carbon (FeAC) permeable reactive barrier (PRB). The study also evaluated the impact of AC and FeAC PRBs' position on the EK process performance. In the EK with the PRB in the middle section, PFOA removal from kaolinite was 52.35 % in the AC-EK tests and 59.55 % in the FeAC-EK. Experimental results showed the accumulation of PFOA near the cathode region in FeAC PRB tests, hypothesising that Fe from the PRB formed a complex with PFOA ions and transported it to the cathode region. Spent PRBs were regenerated with methanol for PFOA extraction and reuse in the EK experiments. Although FeAC PRB achieved better PFOA removal than AC PRB, the EK tests with regenerated AC-EK and FeAC-EK PRBs achieved 40.37 % and 20.62 % PFOA removal. For EK with FeAC PRB near the anode, PFOA removal was 21.96 %. Overall, using PRB in conjunction with the EK process can further enhance the removal efficiency. This concept could be applied to enhance the removal of various PFAS compounds from contaminated soils by combining a suitable PRB with the EK process. It also emphasizes the feasibility of in-situ soil remediation technologies for forever chemical treatment.
期刊介绍:
The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide).
The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.