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Perfluoroalkyl compounds in municipal WWTPs in Tianjin, China—concentrations, distribution and mass flow
Abstract
Backgrounds Perfluorinated compounds (PFCs) have drawn much attention due to their environmental persistence, ubiquitous existence, and bioaccumulation potential. Wastewater treatment plants (WWTPs) are fundamental utilities in cities, playing an important role in preventing water pollution by lowering pollution load in waste waters. However, some of the emerging organic pollutants, like PFCs cannot be efficiently removed by traditional biological technologies in WWTPs, and some even increase in effluents compared to influents due to the incomplete degradation of precursors. Hence, WWTPs are considered to be a main point source in cities for PFCs that enter the aquatic environment. However, the mass flow of PFCs from WWTPs has seldom been analyzed for a whole city. Hence, in the present study, 11 PFCs including series of perfluoroalkyl carboxylic acids (PFCAs, C4-C12) and two perfluoroalkyl sulfonates (PFASs, C6 and C8) were measured in WWTP influents and effluents and sludge samples from six municipal WWTPs in Tianjin, China. Generation and dissipation of the target PFCs during wastewater treatment process and their mass flow in effluents were discussed.Results All the target PFCs were detected in the six WWTPs, and the total PFC concentration in different WWTPs was highly influenced by the population density and commercial activities of the corresponding catchments. Perfluorooctanoic acid (PFOA) was the predominant PFC in water phase, with concentrations ranging from 20 to 170 ng/L in influents and from 30 to 145 ng/L in effluents. Concentrations of perfluoroalkyl sulfonates decreased substantially in the effluent compared to the influent, which could be attributed to the sorption onto sludge, whereas concentrations of PFOA and some other PFCAs increased in the effluent in some WWTPs due to their weaker sorption onto solids and the incomplete degradation of precursors. Perfluorooctane sulfonic acid (PFOS) was the predominant PFC in sludge samples followed by PFOA, and their concentrations ranged from 42 to 169 g/kg and from 12 to 68 g/kg, respectively. Sludge-wastewater distribution coefficients (log K(d)) ranged from 0.62 to 3.87 L/kg, increasing with carbon chain length of the homologues. The mass flow of some PFCs in the effluent was calculated, and the total mass flow from all the six municipal WWTPs in Tianjin was 26, 47, and 3.5 kg/year for perfluorohexanoic acid, PFOA, and PFOS, respectively.
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Increased partitioning of PFAS to the solid phase within WWTPs has been associated with increasing fluoroalkyl chain length.
“The increased partitioning of PFAS to the solid phase within WWTPs has been associated with increasing fluoroalkyl chain length [11, 51, 55].”
From An investigation into per- and polyfluoroalkyl substances (PFAS) in nineteen Australian wastewater treatment plants (WWTPs) (2019) · cites this paper as [51]
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Metadata
- Authors
- Sun, H., Zhang, X., Wang, L., Zhang, T., Li, F., He, N., & Alder, A. C.
- Affiliations
- Nankai University (CN)
- Tianjin Fire Research Institute (CN)
- Swiss Federal Institute of Aquatic Science and Technology (CH)
- Corresponding author
- Sun, Hongwen
- Venue
- Environmental Science and Pollution Research
- Published
- 2012-06
- Volume
- 19
- Issue
- 5
- Pages
- 1405-1415
- ISSN
- 0944-1344 (ISSN-L)
- 1614-7499
- OpenAlex
- W2011793250
- Cited by
- 62
- References
- 45
- Citations by year
- 2025: 4 · 2024: 8 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 3 · 2018: 6 · 2017: 2 · 2016: 11 · 2015: 4 · 2014: 5 · 2013: 5 · 2012: 1
- FWCI
- 3.83
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Environmental Science and Pollution Research (publishedVersion)
- PubMed (publishedVersion)
- DORA Eawag (Swiss Federal Institute of Aquatic Science and Technology (Eawag)) (submittedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
- Physical Sciences › Environmental Science › Pollution › Pharmaceutical and Antibiotic Environmental Impacts
- Physical Sciences › Environmental Science › Water Science and Technology › Fluoride Effects and Removal
- Keywords
- perfluorinated compounds, perfluorinated carboxylic acids, perfluoroalkyl sulfonates, perfluorooctanoic acid, PFOS, municipal wastewater treatment plants, sludge, mass flow, wastewater effluent, sorption, Tianjin, population density
- MeSH terms
- Alkanesulfonates, Caprylates, Carboxylic Acids, China, Cities, Fluorocarbons, Sewage, Waste Disposal, Fluid, Water Pollutants, Chemical, Water Pollution, Alkanesulfonic Acids
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