Yifan Hu, Ruiting Li, Kaiqin Bian, Qing Zhou, Yang Pan, Lin Ye, Aimin Li, Peng Shi
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Notably, nutrient escalation beyond a critical threshold had a diminishing impact on biofilm community composition. Additionally, Fe-Mn stress, while initially enhancing microbial adhesion and metabolic activity, ultimately inhibited biofilm formation over time and increases the prevalence of VBNC bacteria, particularly on stainless steel (SS) surfaces. Our findings also highlighted the importance of material selection for pipelines, with polyvinyl chloride (PVC) showing reduced biofilm formation compared to SS, making it a more suitable option for transporting raw water in environments with high metal content. Dispersal limitation determined the bacterial community assembly during the biofilm formation, accounting for 64.53-90.67% of the variability in different scenarios. 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引用次数: 0
摘要
长距离输水管道中生物膜的形成对水质构成重大风险,尤其是在不同的营养水平和重金属压力下。然而,管道材料在不同原水条件下对生物膜形成动态的影响仍然难以捉摸。本研究调查了营养供应和铁锰应力对生物膜发展、结构稳定性、细菌群落组成以及可存活但不可培养(VBNC)细菌的影响。通过使用具有不同营养条件的反应器,我们观察到营养水平的增加会促进生物膜的生长,但会导致更大的不稳定性,增加二次污染的风险。值得注意的是,超过临界阈值的营养升级对生物膜群落组成的影响越来越小。此外,铁-锰应力虽然最初会增强微生物的粘附性和代谢活性,但随着时间的推移,最终会抑制生物膜的形成,并增加 VBNC 细菌的流行,尤其是在不锈钢(SS)表面。我们的研究结果还强调了管道材料选择的重要性,与 SS 相比,聚氯乙烯(PVC)可减少生物膜的形成,因此更适合在金属含量较高的环境中输送原水。散布限制决定了生物膜形成过程中细菌群落的聚集,占不同情况下变化的 64.53-90.67%。这些见解为管理输水系统中与生物膜相关的问题提供了宝贵的指导,强调了谨慎控制营养水平和材料选择的必要性,以确保长距离输水的安全性。
Biofilm Formation Dynamics in Long-distance Water Conveyance Pipelines: Impacts of Nutrient Levels and Metal Stress
Biofilm formation in long-distance water conveyance pipelines poses significant risks to water quality, particularly under varying nutrient levels and heavy metal stress. However, the impacts of pipeline material on biofilm formation dynamics under different raw water conditions remain elusive. This study investigated the effects of nutrient availability and Fe-Mn stress on biofilm development, structural stability, bacterial community composition, and the occurrence of viable but non-culturable (VBNC) bacteria. Using reactors with different nutrient conditions, we observed that increased nutrient levels promote biofilm growth but lead to greater instability, heightening the risk of secondary contamination. Notably, nutrient escalation beyond a critical threshold had a diminishing impact on biofilm community composition. Additionally, Fe-Mn stress, while initially enhancing microbial adhesion and metabolic activity, ultimately inhibited biofilm formation over time and increases the prevalence of VBNC bacteria, particularly on stainless steel (SS) surfaces. Our findings also highlighted the importance of material selection for pipelines, with polyvinyl chloride (PVC) showing reduced biofilm formation compared to SS, making it a more suitable option for transporting raw water in environments with high metal content. Dispersal limitation determined the bacterial community assembly during the biofilm formation, accounting for 64.53-90.67% of the variability in different scenarios. These insights offer valuable guidance for managing biofilm-related issues in water distribution systems, emphasizing the need for careful control of nutrient levels and material choice to ensure water safety over long distances.
期刊介绍:
Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include:
•Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management;
•Urban hydrology including sewer systems, stormwater management, and green infrastructure;
•Drinking water treatment and distribution;
•Potable and non-potable water reuse;
•Sanitation, public health, and risk assessment;
•Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions;
•Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment;
•Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution;
•Environmental restoration, linked to surface water, groundwater and groundwater remediation;
•Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts;
•Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle;
•Socio-economic, policy, and regulations studies.