Positive effects of lignocellulose on the formation and stability of aerobic granular sludge

Frontiers in Microbiology

Microbiology

Lin Li¹  Shichang Liu²  Xuejun Bi²  Jie Xu²  Yuan Gao²  Wenjuan Xiang² 

[1] Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, China;School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, China;

关键词: aerobic granular sludge;    lignocellulose;    extracellular polymeric substances;    wastewater treatment;    microbial community structure;   

DOI  :  10.3389/fmicb.2023.1254152

 received in 2023-07-06, accepted in 2023-07-31,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionLignocellulose is one of the major components of particulate organic matter in sewage, which has a significant influence on biological wastewater treatment process. However, the effect of lignocellulose on aerobic granular sludge (AGS) system is still unknown.MethodsIn this study, two reactors were operated over 5 months to investigate the effect of lignocellulose on granulation process, structure stability and pollutants removal of AGS.Results and discussionThe results indicated that lignocellulose not only promoted the secretion of tightly bound polysaccharide in extracellular polymeric substances, but also acted as skeletons within granules, thereby facilitating AGS formation, and enhancing structural strength. Lignocellulose imposed little effect on the removal efficiency of pollutants, with more than 95, 99, and 92% of COD, NH4+-N, and PO43−-P were removed in both reactors. However, it did exhibit a noticeable influence on pollutants conversion processes. This might be due to that the presence of lignocellulose promoted the enrichment of functional microorganisms, including Candidatus_Accumulibacter, Candidatus_Competibacter, Nitrosomonas, and Nitrospira, etc. These findings might provide valuable insights into the control strategy of lignocellulose in practical AGS systems.

【 授权许可】

Unknown   
Copyright © 2023 Xu, Gao, Bi, Li, Xiang and Liu.