Cervantes-Avilés Pabel, Camarillo Piñas Nayeli, Ida Junichi, Cuevas-Rodríguez Germán
Department of Civil and Environmental Engineering, Engineering Division, University of Guanajuato, Av. Juárez 77, Zona Centro, Guanajuato, Gto. 36000, Mexico.
Department of Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, 1-236, Tangi-machi, Hachioji, Tokyo, 192-8577, Japan.
J Environ Manage. 2017 Apr 1;190:35-44. doi: 10.1016/j.jenvman.2016.12.054. Epub 2016 Dec 29.
Physicochemical characteristics of wastewater have a relationship with the stability of TiO nanoparticles (NPs). This in turn has an effect on the toxicity of TiO NPs in microorganisms. In this work, the effect of TiO NPs on activated sludge process was evaluated using three different types of wastewater: synthetic, raw, and filtered. The results showed that aggregate size of TiO NPs and their specific adsorption of substrates were influenced by the type of substrates and the presence of suspended solids in the wastewater. It was also shown that TiO NPs in raw wastewater severely inhibited oxygen uptake by microorganisms as compared to uptake in synthetic or filtered wastewater. The attachment of TiO NP aggregates on cell membranes was observed for all types of wastewater. However, the internalization of TiO NPs by microorganisms was observed only for raw and filtered wastewater. These results indicate that the effects caused by TiO NPs on activated sludge were different depending on the wastewater used for the experiment.
废水的物理化学特性与二氧化钛纳米颗粒（NPs）的稳定性相关。这进而会影响二氧化钛纳米颗粒对微生物的毒性。在这项工作中，使用三种不同类型的废水（合成废水、原废水和过滤废水）评估了二氧化钛纳米颗粒对活性污泥工艺的影响。结果表明，二氧化钛纳米颗粒的聚集体尺寸及其对底物的特异性吸附受底物类型和废水中悬浮固体的存在影响。还表明，与合成废水或过滤废水中的微生物相比，原废水中的二氧化钛纳米颗粒严重抑制了微生物对氧气的摄取。在所有类型的废水中都观察到了二氧化钛纳米颗粒聚集体在细胞膜上的附着。然而，仅在原废水和过滤废水中观察到微生物对二氧化钛纳米颗粒的内化作用。这些结果表明，二氧化钛纳米颗粒对活性污泥的影响因实验所用废水的不同而有所差异。
