Unexpected phosphorous removal in a Candidatus_Competibacter and Defluviicoccus dominated reactor
Unexpected phosphorous removal in a Candidatus_Competibacter and Defluviicoccus dominated reactor
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Candidatus_Competibacter 和 Defluviicoccus 占主导地位的反应器中意外除磷
DOI：
10.1016/j.biortech.2021.126540
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发表时间：
2022
影响因子：
11.4
通讯作者：
Xiaoxia Wang
中科院分区：
文献类型：
--
作者：
Xia Song;Deshuang Yu;Yanling Qiu;Chenguang Qiu;Lingna Xu;Ji Zhao;Xiaoxia Wang
聚磷菌和糖原菌之间的竞争是强化生物除磷（EBPR）工艺中的一个难题。以高除磷效率为目标。(PRE)磷释放量（PRA）被认为是一项重要的评价指标。然而，PRE和PRA与PAO丰度之间的相关性尚不清楚。本研究通过调节进水碳磷比（C/P）建立并优化了EBPR工艺。在进水C/P为40 mgCOD/mgP的条件下，运行110 d后，可同时获得17.67 mg/L的PRA和75.86%的PRE。聚磷菌中不含聚磷菌属、聚磷菌属和四球菌属，而下微菌属、假黄单胞菌属则分别占3.69%和3.69%。(1.02未分类的杜鹃花科（Rhododocellaceae）占2.41%。相反，反枝藻属、竞争杆菌属和退流球菌属却意外地富集了高丰度（分别为24.94%和16.04%）。这些结果也表明，仅根据PRA和PRE的变化很难区分聚磷菌是否富集。
Competition between polyphosphate- and glycogen-accumulating organisms (PAOs and GAOs) is problematic in .the enhanced biological phosphorus removal (EBPR) process. Aiming at a high phosphorus removal efficiency .(PRE), the phosphorus release amount (PRA) is considered an essential evaluating indicator. However, the .correlations between PRE and PRA and the abundance of PAOs are not clear. In this study, the EBPR was .established and optimized via adjusting influent carbon to phosphorus ratio (C/P). After 110-day operation, .17.67 mg/L of PRA and 75.86% of PRE simultaneously achieved with influent C/P of 40 mgCOD/mgP. As for .PAOs, Candidatus_Accumulibacter and Tetrasphaera were absent, while Hypomicrobium (3.69%), Pseudofulvimonas .(1.02%), and unclassified_f_Rhodobacteraceae (2.41%) were found at a low level. On the contrary, Candidatus_Competibacter and Defluviicoccus were unexpectedly enriched with high abundance (24.94% and 16.04%, .respectively). These results also suggested that it was difficult to distinguish whether PAOs were enriched merely .based on the variations of PRA and PRE.