Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China; Department of Environmental Technology, Wageningen University and Research, Wageningen 6700AA, the Netherlands.
Bioresour Technol. 2020 Aug;309:123448. doi: 10.1016/j.biortech.2020.123448. Epub 2020 Apr 27.
Granule-based immobilization of anammox biomass assisted by polyvinyl alcohol/chitosan (PVA/CS) and PVA/CS/Fe gel beads was studied, via the operation of three identical up-flow reactors (R1 without gel beads, R2 with PVA/CS, R3 with PVA/CS/Fe) for 203 days. In the end, the nitrogen removal rates (NRR) were 5.3 ± 0.4, 10.0 ± 0.3 and 13.9 ± 0.5 kg-N m d for R1, R2 and R3, respectively. The porous PVA/CS and PVA/CS/Fe created a suitable eco-niche for anammox bacteria to grow and attach, thus being retained in the reactor. The EPS entangles newly grown cells within the gel beads, resulting in compact aggregation. The interaction between Fe ions added to PVA/CS/Fe gel beads and negatively charged EPS groups strongly promoted granule strength and compactness. The immobilization method proposed by this study was found to effectively improve biomass retention in the reactors, which is promising for advanced anammox process applications.
采用聚乙烯醇/壳聚糖（PVA/CS）和 PVA/CS/Fe 凝胶珠辅助颗粒固定化厌氧氨氧化生物量的方法进行了研究，通过三个相同的上流式反应器（R1 无凝胶珠、R2 有 PVA/CS、R3 有 PVA/CS/Fe）运行 203 天。最后，R1、R2 和 R3 的氮去除率（NRR）分别为 5.3±0.4、10.0±0.3 和 13.9±0.5 kg-N m d。多孔的 PVA/CS 和 PVA/CS/Fe 为厌氧氨氧化菌的生长和附着创造了适宜的生态位，从而被保留在反应器中。EPS 将新生长的细胞缠绕在凝胶珠内，导致致密聚集。添加到 PVA/CS/Fe 凝胶珠中的 Fe 离子与带负电荷的 EPS 基团之间的相互作用强烈促进了颗粒的强度和致密性。本研究提出的固定化方法被发现可以有效地提高反应器中生物量的保留，这对于先进的厌氧氨氧化工艺应用具有广阔的前景。
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