Xiong'an Institute of Eco-Environment, Hebei University, Baoding, 071002, China; Institute of Life Science and Green Development, Hebei University, China; Institute of Ecology and Environmental Governance, College of Life Sciences, Hebei University, China.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.
J Environ Manage. 2020 Dec 15;276:111237. doi: 10.1016/j.jenvman.2020.111237. Epub 2020 Aug 28.
Triclocarban (TCC), a typical emerging contaminant, was abundantly released into environment and frequently detected in practical wastewater treatment plants. However it is also an important material when being added to personal skin care products as a antibacterial agent. In this work, the behavior of TCC in wastewater treatment process was investigated. Experiments showed that ~82% of influent TCC was removed by activated sludge adsorption and its adsorption isotherm was well fitted with Linear model and Freundich model. High levels of TCC had seriously impact on the settleability, dewaterability and extracellular polymetric substance (EPS) of activated sludge, even on effluent turbidity after a long-term exposure. Furthermore, the performance of biological wastewater treatment was damaged by TCC long-term exposure as well. The removal rates of total nitrogen and phosphorus decreased from 91.2 ± 2.1% to 72.6 ± 2.2% and from 94.7 ± 3.1% to 78.4 ± 2.3%, respectively, with TCC level increasing from 0 to 100 μg/L. Mechanism analysis showed that TCC exposure significantly inhibited the relevant biological processes, such as ammonia oxidation, denitrification, phosphorus release and uptake, which were closely relevant to nitrogen and phosphorus removal.
三氯卡班（TCC）作为一种典型的新兴污染物，大量排放到环境中，在实际污水处理厂中经常被检测到。然而，它也是个人护肤品中添加的一种重要抗菌剂。在本工作中，研究了 TCC 在污水处理过程中的行为。实验表明，约 82%的进水 TCC 被活性污泥吸附去除，其吸附等温线很好地符合线性模型和 Freundlich 模型。高浓度的 TCC 对活性污泥的沉降性、脱水性能和胞外聚合物（EPS）有严重影响，甚至在长期暴露后对出水浊度也有影响。此外，TCC 的长期暴露也会破坏生物污水处理的性能，总氮和总磷的去除率分别从 91.2±2.1%降至 72.6±2.2%和从 94.7±3.1%降至 78.4±2.3%，TCC 浓度从 0 增加到 100μg/L。机理分析表明，TCC 暴露显著抑制了与氮、磷去除密切相关的相关生物过程，如氨氧化、反硝化、磷释放和吸收。
