Formation of autotrophic nitrogen removal granular sludge driven by the dual-partition airlift internal circulation: Insights from performance assessment, community succession, and metabolic mechanism,Journal of Environmental Management

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Formation of autotrophic nitrogen removal granular sludge driven by the dual-partition airlift internal circulation: Insights from performance assessment, community succession, and metabolic mechanism
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2024-01-24 , DOI: 10.1016/j.jenvman.2024.120158
Hong Wang ₁ , Xiaoguang Liu ₁ , Yu Hua ₁ , Haolian Xu ₁ , Yongdong Chen ₁ , Donghai Yang ₁ , Xiaohu Dai ₁

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Granular sludge has been recognized as an effective method for the application and industrialization of the anammox-based process due to its good biomass retention capacity and environmental tolerance. In this study, a one-stage autotrophic nitrogen removal (ANR) dual-partition system with airlift internal circulation was implemented for 320 days. A high nitrogen removal efficiency of 84.6% was obtained, while the nitrogen removal rate reached 1.28 g-N/L/d. ANR granular sludge dominated by and was successfully cultivated. Results showed that activity and abundance of functional flora first increased with granulation process, but eventually declined slightly when particle size exceeded the optimal range. Total anammox activity was observed to be significantly correlated with protein content (R = 0.9623) and nitrogen removal performance (R = 0.8796). Correlation network revealed that AnAOB had complex interactions with other bacteria, both synergy for nitrogen removal and competition for substrate. Changes in abundances of genes encoding the Carbohydrate Metabolism, Energy Metabolism, and Membrane Transport suggested energy production and material transfer were possibly blocked with further sludge granulation. Formation of ANR granular sludge promoted the interactions and metabolism of functional microorganisms, and the complex nitrogen metabolic pathways improved the performance stability. These results validated the feasibility of granule formation in the airlift dual-partition system and revealed the response of the ANR system to sludge granulation.

中文翻译：

双分区气升式内循环驱动自养脱氮颗粒污泥的形成：性能评估、群落演替和代谢机制的见解

颗粒污泥因其良好的生物质截留能力和环境耐受性而被认为是厌氧氨氧化工艺应用和工业化的有效方法。在这项研究中，采用了气升式内循环的一级自养脱氮（ANR）双分区系统，实施了320天。脱氮效率高达84.6%，脱氮率达到1.28 gN/L/d。以ANR颗粒污泥为主并成功培养。结果表明，随着造粒过程的进行，功能菌群的活性和丰度首先增加，但当粒径超过最佳范围时，功能菌群的活性和丰度最终略有下降。观察到总厌氧氨氧化活性与蛋白质含量（R = 0.9623）和脱氮性能（R = 0.8796）显着相关。相关网络显示AnAOB与其他细菌具有复杂的相互作用，既协同脱氮又竞争底物。编码碳水化合物代谢、能量代谢和膜运输的基因丰度的变化表明，进一步的污泥颗粒化可能会阻碍能量产生和物质转移。 ANR颗粒污泥的形成促进了功能微生物的相互作用和代谢，复杂的氮代谢途径提高了性能稳定性。这些结果验证了气升双分区系统颗粒形成的可行性，并揭示了ANR系统对污泥颗粒化的响应。

更新日期：2024-01-24

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