College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China.
Bioresour Technol. 2020 Apr;301:122798. doi: 10.1016/j.biortech.2020.122798. Epub 2020 Jan 14.
The polyvinyl formal (PVFM) biocarrier addition in a membrane bioreactor (MBR) was evaluated at high and low carbon/nitrogen (C/N) ratio of 20.0 and 6.7. Results indicated that static biocarrier addition could enrich nitrification and denitrification bacteria, dominating by Tauera, Amaricoccus and Nitrosospira at the genus level and slightly improved the total nitrogen removal even at a low C/N ratio. The bulk sludge characteristics (such as bigger particle size, lower SMP, lower SMP P/C) were also significantly changed in the hybrid MBR (HMBR), leading to a more sustainable membrane operation. The biocarrier addition also reduced the relative abundance of Sphingobacterials_unclassified, Ohtaekwangia and Rhodocyclaceae_unclassified at the genus level, indicating less membrane fouling in the HMBR. Consequently, HMBR with static PVFM addition could partially overcome the drawback of low C/N ratio for total nitrogen removal and membrane fouling control, providing a more resilient MBR to the undesirable environment such as low C/N ratio.
聚乙烯醇缩甲醛（PVFM）生物载体在膜生物反应器（MBR）中的添加在高和低碳氮比（C/N）20.0 和 6.7 下进行了评估。结果表明，静态生物载体添加可以富集硝化和反硝化细菌，属水平上以 Tauera、Amaricoccus 和 Nitrosospira 为主，即使在低 C/N 比下也能略微提高总氮去除率。混合 MBR（HMBR）中还显著改变了絮体污泥特性（如更大的颗粒尺寸、更低的 SMP、更低的 SMP P/C），从而使膜运行更具可持续性。生物载体添加还降低了属水平上的 Sphingobacterials_unclassified、Ohtaekwangia 和 Rhodocyclaceae_unclassified 的相对丰度，表明 HMBR 中的膜污染减少。因此，静态 PVFM 添加的 HMBR 可以部分克服低 C/N 比下总氮去除和膜污染控制的缺点，为 MBR 提供了对低 C/N 比等不良环境更具弹性的处理方式。
