School of Water Conservancy and Transportation, Zhengzhou University. Zhengzhou 450001, China; Yellow River Laboratory, Zhengzhou University. Zhengzhou 450001, China; National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology, Zhengzhou 450001, China; Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety, Henan Province, Zhengzhou 450001, China.
School of Water Conservancy and Transportation, Zhengzhou University. Zhengzhou 450001, China.
J Environ Manage. 2024 May;359:121107. doi: 10.1016/j.jenvman.2024.121107. Epub 2024 May 9.
Microbial induced concrete corrosion (MICC) is the primary deterioration affecting global sewers. Disentangling ecological mechanisms in the sewer system is meaningful for implementing policies to protect sewer pipes using trenchless technology. It is necessary to understand microbial compositions, interaction networks, functions, alongside assembly processes in sewer microbial communities. In this study, sewer wastewater samples and microbial samples from the upper part (UP), middle part (MP) and bottom part (BP) of different pipes were collected for 16S rRNA gene amplicon analysis. It was found that BP harbored distinct microbial communities and the largest proportion of unique species (1141) compared to UP and MP. The community in BP tended to be more clustered. Furthermore, significant differences in microbial functions existed in different spatial locations, including the carbon cycle, nitrogen cycle and sulfur cycle. Active microbial sulfur cycling indicated the corrosion risk of MICC. Among the environmental factors, the oxidation‒reduction potential drove changes in BP, while sulfate managed changes in UP and BP. Stochasticity dominated community assembly in the sewer system. Additionally, the sewer microbial community exhibited numerous positive links. BP possessed a more complex, modular network with higher modularity. These deep insights into microbial ecology in the sewer system may guide engineering safety and disaster prevention in sewer infrastructure.
微生物诱导的混凝土腐蚀 (MICC) 是影响全球污水管道的主要劣化因素。解析污水系统中的生态机制对于利用非开挖技术实施保护污水管道的政策具有重要意义。了解污水微生物群落中的微生物组成、相互作用网络、功能以及组装过程是必要的。在这项研究中，采集了不同管道上部 (UP)、中部 (MP) 和底部 (BP) 的污水废水样本和微生物样本，进行了 16S rRNA 基因扩增子分析。结果表明，BP 具有独特的微生物群落，并且与 UP 和 MP 相比，具有最大比例的独特物种 (1141)。BP 中的群落更倾向于聚类。此外，不同空间位置的微生物功能存在显著差异，包括碳循环、氮循环和硫循环。活跃的微生物硫循环表明 MICC 存在腐蚀风险。在环境因素中，氧化还原电位驱动 BP 的变化，而硫酸盐则管理 UP 和 BP 的变化。随机性主导着污水系统中群落的组装。此外，污水微生物群落表现出许多正相关联系。BP 具有更复杂、模块化的网络，具有更高的模块性。这些对污水系统中微生物生态学的深入了解可能指导污水基础设施的工程安全和灾害预防。
