National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China; Chongqing Water & Environment Holdings Group Ltd., Chongqing, 400010, China.
National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China.
Chemosphere. 2022 Dec;308(Pt 1):136176. doi: 10.1016/j.chemosphere.2022.136176. Epub 2022 Aug 28.
Benefited from the massive filling bio-carriers, the packed cage rotating biological contactors (RBCs) have better performance and application potentiality in wastewater treatment. Investigating the effects mechanism of bio-carrier filling rate is crucial for such reactors management. In this study, the pollutants removal performance, biofilms physical characteristics, and microbial communities of the biofilms under a series of bio-carrier filling rates were analyzed. The results shown, the pollutant removal rate and amount were quite different under different filling rates, and biofilms structure and microbial composition were the main factors affecting the pollutants removal performance. With the increasing filling rates, the biofilms were more mass increased (dry weight from 0.066 to 0.148 g/per carrier), thicker (from 340.30 to 850.84 μm) and lower dense (from 0.068 to 0.060 g/cm). The microbial community composition of those biofilms was also quite different at the genus level. The effects mechanism of bio-carrier filling rate can be summarized: the filling rates affect the physical and biological characteristics of biofilms, which will further affect the microenvironment and microbial distribution in biofilms, and then determines the pollutant metabolic rate and metabolic pathway. This study will contribute to design better bio-carrier filling rate according to different wastewater treatment scenario, and promote the performance optimization of packed cage RBCs.
得益于大量填充的生物载体，填充式 Cage 旋转生物接触器 (RBC) 在废水处理中具有更好的性能和应用潜力。研究生物载体填充率的影响机制对于此类反应器的管理至关重要。在这项研究中，分析了一系列生物载体填充率下污染物去除性能、生物膜物理特性和生物膜微生物群落。结果表明，不同填充率下污染物去除率和去除量有很大差异，生物膜结构和微生物组成是影响污染物去除性能的主要因素。随着填充率的增加，生物膜的质量增加（干重从 0.066 增加到 0.148 g/每个载体），厚度增加（从 340.30 增加到 850.84 μm），密度降低（从 0.068 降低到 0.060 g/cm）。这些生物膜的微生物群落组成在属水平上也有很大差异。生物载体填充率的影响机制可以概括为：填充率影响生物膜的物理和生物特性，这将进一步影响生物膜中的微环境和微生物分布，从而决定污染物的代谢速率和代谢途径。本研究将有助于根据不同的废水处理情况设计更好的生物载体填充率，并促进填充式 Cage RBC 的性能优化。
