Enhanced nutrient removal of simultaneous partial nitrification, denitrification and phosphorus removal (SPNDPR) in a single-stage anaerobic/micro-aerobic sequencing batch reactor for treating real sewage with low carbon/nitrogen. (October 2020)

• Record Type: Journal Article
• Authors: Yuan, Chuansheng; Wang, Bo; Peng, Yongzhen; Li, Xiyao; Zhang, Qiong; Hu, Tiantian
• Is Part Of: Chemosphere. Volume 257(2020)
• Publication Date: 2020-10
• Subjects: Simultaneous partial nitrification denitrification and phosphorus removal (SPNDPR) -- Partial nitrification -- DPAOs -- DGAOs -- Microbial community; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127097
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The feasibility of simultaneous partial nitrification, denitrification and phosphorus removal (SPNDPR) process was investigated in a single-stage anaerobic/micro-aerobic sequencing batch reactor for treating real sewage. Partial nitrification was maintained with average nitrite accumulation ratio of 90.3% during 266 days' operation. Removal efficiencies for NH4 + -N (96.3%), total inorganic nitrogen (81.4%), and phosphorus (91.0%) were stably obtained when treated real sewage with low carbon/nitrogen (3.4), with simultaneous partial nitrification and denitrification efficiency of 73.1%. The mechanism analysis revealed that denitrifying glycogen-accumulating organisms (DGAOs) and denitrifying polyphosphate-accumulating organisms (DPAOs) played the main roles in N-removal and P-removal, respectively. Nitrite pathway and optimized use of the organic carbon available in the sewage were keys for the successful performance. Further microbial community illustrating that DGAOs Candidatus_Competibacter, DPAOs Dechloromonas, and ammonia-oxidizing bacteria Nitrosomonadaceae were main functional groups. Notably, sludge granulation was formed under long-term synchronous low dissolved oxygen and low sludge loading conditions, avoiding sludge bulking. Graphical abstract: Image 1 Highlights: A single-stage SPNDPR SBR via nitrite pathway was established to treat real sewage. TIN and P removal (81.4% and 91.0%) were achieved with C/N of 3.4. Simultaneous partial nitrification and denitrification efficiency was up to 73.1%. P-uptake mainly relied on DPAOs while N-removal mainly relied on DGAOs in low DO. Granulation was formed under long-term low DO and loading, avoiding sludge bulking.