Effects of Dissolved Oxygen on Nutrient Removal Performance and Microbial Community in Low Carbon/Nitrogen Municipal Wastewater Treatment Process

被引：0
作者：
Chi Y.-L. [1 ]
Shi X. [1 ]
Ren T. [1 ]
Wang X.-C. [1 ]
Jin P.-K. [1 ]
机构：
[1] School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 09期
关键词：
Dissolved oxygen (DO); Low carbon source; Metabolic mechanism; Microbial community; Municipal wastewater;
D O I：
10.13227/j.hjkx.202012261
中图分类号：
学科分类号：
摘要：
To explore the effects of dissolved oxygen (DO) on the treatment of low carbon/nitrogen municipal wastewater, this study examined the characteristics of the microbial community in a low carbon source environment. The treatment process was conducted with the aeration area having DO concentrations of 2-3, 1-2, and lower than 1 mg•L-1. The results demonstrated that reduced DO concentration in the aeration area increased the efficiency of the nitrogen removal process by 20.23% and 80.54%, for external and internal carbon sources, respectively. Similarly, the efficiency of internal carbon source utilization in the phosphorus removal process increased by 13.89%, thus enhancing the nutrient removal efficiency of the low carbon/nitrogen wastewater treatment system. High-throughput sequencing and RDA analysis showed that reduced oxygen concentration motivated an adjustment in microbial community structure, causing functional microorganisms (i.e., Dechloromonas) to become dominant. In addition, the upregulation of genes associated with energy production and conversion, signal transduction, substrate transport, and metabolism provided favourable nutritional conditions for the proliferation of functional microorganisms in low carbon source conditions. This study provides a theoretical basis for improving the growth of microorganisms involved in the nutrient removal process when treating low carbon/nitrogen municipal wastewater. © 2021, Science Press. All right reserved.
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页码：4374 / 4382
页数：8
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