Department of Water and Wastewater Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore.
Bioresour Technol. 2020 Sep;312:123531. doi: 10.1016/j.biortech.2020.123531. Epub 2020 May 18.
Microalgal-bacterial granular sludge processes are attracting increasing research interest in fields of biological municipal wastewater treatment. However, these processes currently suffer from inefficient phosphorus removal and long hydraulic reaction time. As such, a self-sustaining synergetic microalgal-bacterial granular sludge process was explored for improving phosphorus removal. Results showed that about 86% of influent phosphorus could be removed within 6 h comprising 2-hr dark phase and 4-hr light phase. Slight phosphorus release was observed in dark phase, followed by a significant phosphorus uptake in light phase together with the accumulation of poly-phosphorus in microalgal cells. The analyses by PacBio's sequencing and fluorescence in situ hybridization revealed that microalgal genus of Pantanalinema were the major phosphorus-accumulating organisms. Based on these experimental observations, the removal mechanisms of phosphorus by microalgal-bacterial granular sludge process were identified. It is expected that this study may shed lights on the pathways of biological phosphorus removal in microalgal-bacterial granular sludge process.
微藻-细菌颗粒污泥工艺在生物市政污水处理领域引起了越来越多的研究兴趣。然而，这些工艺目前存在除磷效率低和水力停留时间长的问题。因此，探索了一种自维持协同微藻-细菌颗粒污泥工艺来提高除磷效果。结果表明，在 6 小时内，约 86%的进水磷可以被去除，其中包括 2 小时的暗相和 4 小时的光相。在暗相中观察到轻微的磷释放，随后在光相中进行显著的磷吸收，并在微藻细胞中积累多磷。PacBio 测序和荧光原位杂交分析表明，潘塔纳尔内梅属（Pantanalinema）是主要的聚磷菌。基于这些实验观察，确定了微藻-细菌颗粒污泥工艺除磷的机制。预计本研究可为微藻-细菌颗粒污泥工艺中生物除磷的途径提供启示。
