| Autor: |
Fennell BD; Zachry Department of Civil & Environmental Engineering, Texas A&M University, College Station, Texas 77845, United States., Odorisio A; Zachry Department of Civil & Environmental Engineering, Texas A&M University, College Station, Texas 77845, United States., McKay G; Zachry Department of Civil & Environmental Engineering, Texas A&M University, College Station, Texas 77845, United States. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental science & technology [Environ Sci Technol] 2022 Jul 19; Vol. 56 (14), pp. 10329-10338. Date of Electronic Publication: 2022 Jul 06. |
| DOI: |
10.1021/acs.est.2c02003 |
| Abstrakt: |
Ultraviolet advanced reduction processes (UV-ARP) have garnered significant attention recently for the degradation of several hard to treat contaminants, including recalcitrant per- and polyfluoroalkyl substances (PFAS). The rate of contaminant degradation in UV-ARP is directly related to the available hydrated electron concentration ([e aq - ]). However, reports of [e aq - ] and other parameters typically used to characterize photochemical systems are not widely reported in the UV-ARP literature. Deploying monochloroacetate as a probe compound, we developed a method ( R e-,UV ) to quantify the time-based hydrated electron concentration ([e aq ] t ) available for contaminant degradation relative to inputted UV fluence. Measured [e aq ] t was then used to understand the impact of e aq - rate of formation and scavenging capacity on the degradation of two contaminants─nitrate and perfluorooctane sulfonate (PFOS)─in four source waters with varying background water quality. The results show that the long-term treatability of PFOS by UV-ARP is not significantly impacted by the initial e aq - scavenging conditions but rather is influenced by the presence of e aq - scavengers like dissolved organic carbon and bicarbonate. Lastly, using [e aq ] t , degradation of nitrate and PFOS was modeled in the source waters. We demonstrate that the R e-,UV method provides an effective tool to assess UV-ARP treatment performance in a variety of source waters. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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