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New insights into multi-strategies of sludge granulation in up-flow anaerobic sludge blanket reactors from community succession and interaction
Bioresource Technology ( IF 11.4 ) Pub Date : 2023-03-21 , DOI: 10.1016/j.biortech.2023.128935
Yeyuan Xiao 1 , Xucai Wang 1 , Peiling Wang 1 , Zhongbo Zhou 2 , Hui Wang 3 , Tao Teng 1 , Yiwei Li 1 , Lei Yang 1
Affiliation  

This study aimed to elucidate the multiple strategies employed by anaerobes during granulation in a laboratory upflow anaerobic sludge blanket reactor, based on microbial succession and interactions. The anaerobic granulation process featured staged dominance of microbial genera, corresponding well with the environmental traits. Across the stages (selection, seeding, expansion, and maturation), chemotaxis attraction of nitrogen and/or carbon sources and flagellar motion were the primary strategy of microbial assembly. The second messengers – cyclic adenosine and guanosine monophosphates – partially regulated the agglomeration of filamentous Euryachaeota and Chloroflexi as the inner cores, while quorum sensing mediated the expansion of granules prior to maturation. Antagonism or competition governed the interactions within the phylogenetic molecular ecological network during sludge granulation, which were largely driven by the low-abundance (<1%) taxa. These new insights suggest that better engineering solutions to enhance chemotaxis attraction and species selection could achieve more efficient anaerobic granular sludge processes.



中文翻译:

从群落演替和相互作用对上流式厌氧污泥床反应器污泥粒化多策略的新见解

本研究旨在基于微生物演替和相互作用,阐明厌氧菌在实验室上流式厌氧污泥床反应器造粒过程中采用的多种策略。厌氧制粒工艺具有微生物属的阶段性优势,与环境特性很好地对应。在各个阶段(选择、播种、扩张和成熟),氮和/或碳源的趋化性吸引和鞭毛运动是微生物组装的主要策略。第二信使——环腺苷和鸟苷一磷酸——部分调节作为内核的丝状广毛纲和绿屈曲菌的聚集,而群体感应介导颗粒在成熟前的膨胀。对抗或竞争控制着污泥粒化过程中系统发育分子生态网络内的相互作用,这在很大程度上是由低丰度 (<1%) 类群驱动的。这些新见解表明,更好的工程解决方案可以增强趋化性吸引力和物种选择,从而实现更高效的厌氧颗粒污泥工艺。

更新日期:2023-03-21
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