Gansu Key Laboratory of Biomonitoring and Bioremediation for Environment Pollution, School of Life Science, Lanzhou University, Tianshui South Road #222, Lanzhou, Gansu, 730000, PR China.
Peoples' Friendship University of Russia, 117198, Moscow, Miklukho-Maklaya str., 6, Russia.
Chemosphere. 2021 Sep;279:130596. doi: 10.1016/j.chemosphere.2021.130596. Epub 2021 Apr 16.
The existence of perfluorooctane sulfonate (PFOS) in large quantities threatens environment biosafety. However, the fate of PFOS in a sequencing batch reactor (SBR) system and its influence in system has not yet been revealed. In this study, the fate and behavior of PFOS in an SBR processing system were investigated. Mass balance analyses revealed that PFOS removal was mainly through adsorption. After the reactors were run for 20 days, the PFOS (100 mg/L) removal rate was only 28%. Under the influence of PFOS, the removal rates of chemical oxygen demand (COD) and ammonia nitrogen dropped rapidly from 92, 98% to 23, 35% in the 20th day of system operation, respectively, while, accumulation of nitrite and nitrate was reduced. Compared with the control group, PFOS stimulates microorganisms to secrete more soluble microbial products (SMP) and extracellular polymeric substances (EPS). The adsorption of PFOS and EPS causes sludge bulking and decreases settling. The richness and diversity of microorganisms decreased significantly, affecting the system's removal of COD and ammonia nitrogen. Therefore, the SBR system is not suitable for treating wastewater containing PFOS. It is necessary to remove PFOS through pretreatment to reduce its impact on the SBR system.
全氟辛烷磺酸 (PFOS) 的大量存在威胁着环境生物安全。然而，序列间歇式反应器 (SBR) 系统中 PFOS 的命运及其对系统的影响尚未揭示。本研究考察了 PFOS 在 SBR 处理系统中的归趋和行为。质量平衡分析表明，PFOS 的去除主要通过吸附。当反应器运行 20 天后，PFOS（100mg/L）的去除率仅为 28%。在 PFOS 的影响下，COD 和氨氮的去除率在系统运行第 20 天分别从 92%、98%迅速下降至 23%、35%，同时亚硝酸盐和硝酸盐的积累减少。与对照组相比，PFOS 刺激微生物分泌更多的可溶性微生物产物 (SMP) 和胞外聚合物 (EPS)。PFOS 和 EPS 的吸附导致污泥膨胀，沉降性降低。微生物的丰富度和多样性显著下降，影响了系统对 COD 和氨氮的去除。因此，SBR 系统不适合处理含有 PFOS 的废水。需要通过预处理去除 PFOS，以降低其对 SBR 系统的影响。
