Insight into dead space effects in granular anammox process with organic stress,Bioresource Technology

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Insight into dead space effects in granular anammox process with organic stress
Bioresource Technology ( IF 9.7 ) Pub Date : 2022-06-20 , DOI: 10.1016/j.biortech.2022.127504
Dong Li ₁ , Ziqing Wei ₁ , Shuai Li ₁ , Huiping Zeng ₁ , Jie Zhang ₂

Affiliation

In this study, the dead space was demonstrated to enhance the robustness of anammox nitrogen (N)-removal under organic stress. Different from the “yellow aggregates” that inhabit in mixing space were assembled by anammox and heterotrophic micro-colonies, the “red granules” that inhabit in dead space were formed by initial anammox aggregates that growing outward with higher anammox-activity, settleability and sludge stability, which endowed the dead space the role of “anammox-stabilizer” with prominent anammox N-removal contribution (63.8%) especially under high organic stress. The extracellular polymeric substances (EPS) dynamic balance test revealed that the high and stable EPS contents in dead space were attributed to the low EPS degradation rate and low proportion of heterotrophic bacteria (HB)-produced EPS, respectively. The weak hydrodynamic forces were the key to less HB-colonization and high granular stability in dead space. Retaining a certain dead space is necessary to prevent anammox bacteria (AnAOB) loss under organic stress.

中文翻译：

深入了解有机胁迫下颗粒厌氧氨氧化过程中的死腔效应

在这项研究中，死腔被证明可以增强有机胁迫下厌氧氨氧化氮（N）去除的稳健性。与混合空间中由厌氧氨氧化和异养微菌落聚集而成的“黄色团聚体”不同，死角中栖息的“红色颗粒”是由最初的厌氧氨氧化团聚体向外生长形成的，具有较高的厌氧氨氧化活性、沉降性和污泥性。稳定性，赋予死腔“厌氧氨氧化稳定剂”的作用，特别是在高有机胁迫下，厌氧氨氧化脱氮贡献显着（63.8%）。细胞外聚合物（EPS）动态平衡测试表明，死腔中高且稳定的EPS含量分别归因于EPS降解率低和异养细菌（HB）产生的EPS比例低。弱水动力是死腔中 HB 定植减少和颗粒稳定性高的关键。保留一定的死腔对于防止有机胁迫下厌氧氨氧化菌（AnAOB）的损失是必要的。

更新日期：2022-06-20

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