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Phosphorus absorption and release in biofilm sequencing batch reactor: The combined action of cells and extracellular polymeric substances and the characteristics of polymer metabolism
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2022-07-12 , DOI: 10.1016/j.jwpe.2022.102979
Yue Chen, Lu Li, Yue Zhang, Yang Pan, Min Ni, Wanjing Yang, Yong Huang

The biofilm sequencing batch reactor (BSBR) can simultaneously remove and enrich phosphorus from wastewater highly efficiently. However, the mechanism of phosphorus transformations in the biofilm remains to be clarified. This present work examines the biofilm in the BSBR, to reveal the changes of phosphorus in the cells and the extracellular polymeric substances (EPS) and to assess how the metabolic characteristics of intracellular polymers (polyhydroxyalkanoate, glycogen, polyphosphorus) affect the migration and transformation of phosphorus. When the BSBR reactor is under steady operation (20 °C, DO = 6 mg·L−1, the influent phosphorus concentration = 10 mg·L−1, and the aerobic phosphorus removal efficiency >95 %), the phosphorus in the biofilm is mainly distributed in the EPS, as the total phosphorus of EPS account for 83.20 %–86.97 % of the total phosphorus of the biofilm. Phosphorus speciation shows that the biofilm realizes the absorption and release of phosphorus through the combined action of EPS and cells. The cells provide the primary driving force, and the EPS play a key role. The intracellular polyphosphorus is closely related to polyhydroxyalkanoate (PHA) but not glycogen. High-throughput sequencing demonstrates that the microbial population in the biofilm is dominated by the bacteria that secrete EPS that can enhance to phosphorus removal.



中文翻译:

生物膜序批式反应器中磷的吸收和释放:细胞与胞外聚合物的联合作用及聚合物代谢的特点

生物膜序批式反应器(BSBR)可以同时高效地去除和富集废水中的磷。然而,生物膜中磷转化的机制仍有待阐明。这项目前的工作检查了 BSBR 中的生物膜,以揭示细胞中磷和细胞外聚合物 (EPS) 的变化,并评估细胞内聚合物(聚羟基链烷酸酯、糖原、多磷)的代谢特性如何影响细胞的迁移和转化。磷。BSBR反应器稳定运行时(20 ℃, DO = 6 mg·L -1 , 进水磷浓度= 10 mg·L -1, 好氧除磷效率 >95 %), 生物膜中的磷主要分布在 EPS 中, 因为 EPS 的总磷占生物膜总磷的 83.20 %~86.97 %。磷形态分析表明,生物膜通过EPS与细胞的联合作用实现对磷的吸收和释放。细胞提供主要驱动力,而 EPS 起着关键作用。细胞内多磷与聚羟基链烷酸酯 (PHA) 密切相关,但与糖原无关。高通量测序表明,生物膜中的微生物群主要是分泌 EPS 的细菌,EPS 可以增强除磷。

更新日期:2022-07-12
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