期刊
WATER RESEARCH
卷 221, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118806
关键词
Microplastics; Dissolved organic matter; Sand infiltration; Fluorescence; UV aging; Disinfection byproducts
资金
- National Research Council of Science and Technology [CAP-17-05-KIGAM]
- National Research Foundation of Korea (NRF) [2020R1A2C2007248]
- National Research Foundation of Korea [2020R1A2C2007248] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study tracks the spectroscopic signatures of MPs in sandy subsurface systems and explores their potential to form disinfection byproducts (DBPs). The addition of MPs increases the amount of dissolved organic matter (DOM) during infiltration, with UV-irradiated MPs having a more pronounced effect. Two fluorescent components, C1 and C2, are identified, with C1 being more predominant. Environmental interferences such as biodegradation and mineral adsorption do not fully explain the spectroscopic signatures of MP-DOM in the infiltration process.
Microplastic (MP) pollution in soil/subsurface environments has been increasingly researched, given the uncertainties associated with the heterogeneous matrix of these systems. In this study, we tracked the spectroscopic signatures of MP-derived dissolved organic matter (MP-DOM) in infiltrated water from MP contaminated sandy subsurface systems and examined their potential to form trihalomethanes (THMs) and haloacetic acids (HAAs) by chlorination. Sand-packed columns with commercial MPs (expanded polystyrene and polyvinylchloride) on the upper layer were used as the model systems. Regardless of the plastic type, the addition of MPs resulted in a higher amount of DOM during infiltration compared with the clean sand system. This enhancement was more pronounced when the added MPs were UV-irradiated for 14 days. The infiltration was further characterized using FT-IR and fluorescence spectroscopy, which identified two fluorescent components (humic-like C1 and protein/ phenol-like C2). Compared with pure MP-DOM, C1 was more predominant in sand infiltration than C2. Further studies have established that C2 may be more labile in terms of biodegradation and mineral adsorption that may occur within the sand column. However, both these environmental interferences were inadequate for entirely expanding the spectroscopic signatures of MP-DOM in sand infiltration. The infiltration also exhibited a higher potential in generating carbonaceous disinfection byproducts than natural groundwater and riverside bank filtrates. A significant correlation between the generated THMs and decreased C1 suggests the possibility of using humic-like components as optical precursors of carbonaceous DBPs in MP-contaminated subsurface systems. This study highlighted an overlooked contribution of MPs in terms of the infiltration of DOM levels in sandy subsurface systems and the potential environmental risk when used as drinking water sources.
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