School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.
School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin, 300401, China.
Chemosphere. 2022 Mar;291(Pt 1):132724. doi: 10.1016/j.chemosphere.2021.132724. Epub 2021 Oct 27.
Accurately revealing and predicting the presence and risks of per-/poly-fluoroalkyl substances (PFASs) in constructed wetlands (CWs) is great significant for the construction and management of CWs, but very challenging. In this work, a novel fate and transport model was for the first time established to evaluate the spatially continuous distribution and environmental risks of PFASs among multi-media in Lingang hybrid CW fed by industry tailwater. 20 PFASs were detected from the Lingang CW, and the total concentration of the detected PFASs in water and sediments were in the range of 38.94-81.65 ng/L and 1.23-4.31 ng/g, respectively. PFOA, PFOS and PFBS were the main pollutants in water and sediments. A fate and transport model describing the distribution characteristics and fate of PFASs in Lingang hybrid CW was constructed, and its reliability was verified. The simulated results suggested that PFASs were mainly accumulated in sediments and long-chain PFASs were more easily adsorbed by sediments compared with short-chain PFASs. According to the principal component analysis-multiple linear regression (PCA-MLR), PFASs mainly came from the tailwater from the surrounding sewage treatment plants. Besides, the environmental risks were predicted by this novel model, suggesting that the risks still cannot be neglected due to the accumulation and continuous input of PFASs although the environmental risks of Lingang CW were low. This work provides a novel model for the understanding of presence and risks of PFASs among multi-media in CWs.
准确揭示和预测人工湿地（CWs）中全氟/多氟烷基物质（PFASs）的存在和风险，对于 CWs 的建设和管理具有重要意义，但也极具挑战性。在这项工作中，首次建立了一种新的命运和传输模型，以评估工业尾水补给的临港混合 CW 中多介质中 PFASs 的空间连续分布和环境风险。从临港 CW 中检测到 20 种 PFASs，水中和沉积物中检测到的 PFASs 的总浓度范围分别为 38.94-81.65 ng/L 和 1.23-4.31 ng/g。PFOA、PFOS 和 PFBS 是水中和沉积物中的主要污染物。构建了一个描述临港混合 CW 中 PFASs 分布特征和归宿的命运和传输模型，并对其可靠性进行了验证。模拟结果表明，PFASs 主要在沉积物中积累，与短链 PFASs 相比，长链 PFASs 更容易被沉积物吸附。根据主成分分析-多元线性回归（PCA-MLR），PFASs 主要来自周围污水处理厂的尾水。此外，通过这个新模型预测了环境风险，尽管临港 CW 的环境风险较低，但由于 PFASs 的积累和持续输入，风险仍然不可忽视。这项工作为理解 CWs 中多介质中 PFASs 的存在和风险提供了一种新的模型。
