LUO Jing-yang,ZHANG Le,ZHANG Teng,et al.Effects of Different Processes on Wastewater Treatment Efficiency and Bacterial Metabolic Function[J].China Water & Wastewater,2021,37(23 23):61-67.
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Effects of Different Processes on Wastewater Treatment Efficiency and Bacterial Metabolic Function

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 23 23 Page: 61-67 Column: Date of publication: 2021-12-01
Author(s):
LUO Jing-yang1; 2; ZHANG Le1; 2; ZHANG Teng1; 2; YANG E1; 2; CAO Jia-shun1; 2; WU Yang1; 2; 3
(1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes , Hohai University, Nanjing 210098, China; 2. College of Environment, Hohai University, Nanjing 210098, China; 3. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China)
Keywords:
wastewater treatment plant; treatment process; total nitrogen removal efficiency; bacterial community; functional genes
Abstract:
The process selection of wastewater treatment plant is critical to the final treatment performance. The effects of different treatment processes on removal of typical pollutants (especially total nitrogen) in wastewater treatment plants were mainly investigated, and the underlying mechanisms were analyzed from perspectives of bacterial community and metabolic function. Compared with a combined process of vortex grit chamber and traditional A2O, the combined process of aerated grit chamber and modified A2O was more conducive to the removal of typical pollutants (especially total nitrogen) from wastewater.Compared with vortex grit chamber, the aerated grit chamber had better sand removal performance, which reduced inorganic components in sludge and increased its biomass. The preanoxic tank in the modified A2O process was beneficial to the enrichment of functional bacteria and the enhancement of metabolic activity. The abundances of typical nitrifying and denitrifying bacteria (e.g. Saprospiraceae, Dechloromonas, Haliangium, Thauera, Nitrosomonas and Saccharimonadales) and numbers of the related functional genes (hao, nor, nap, etc.) were all significantly increased. Therefore, nitrification and denitrification rates in the corresponding biological units were greatly increased, which improved the removal efficiencies of total nitrogen and other pollutants in the wastewater treatment plant.The results provided a scientific basis and theoretical guidance for further understanding the internal mechanism of pollutants removal by different units and selecting the upgrading and reconstruction process in wastewater treatment plants.
Last Update: 2021-12-01