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Achieving deep-level nutrient removal via combined denitrifying phosphorus removal and simultaneous partial nitrification-endogenous denitrification process in a single-sludge sequencing batch reactor

[Display omitted] •A novel DPR-SPNED process was established to treat municipal and nitrate sewages.•High PO43−-P and TN removal (97.5% and 90.8%) was obtained without extra carbon.•Dechloromonas, Candidatus Competibacter and Nitrosomonas dominated the DPR-SPNED.•Bottleneck of inefficient carbon use...

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Published in:Bioresource technology 2019-10, Vol.289, p.121690-121690, Article 121690
Main Authors: Du, Shiming, Yu, Deshuang, Zhao, Ji, Wang, Xiaoxia, Bi, Chunxue, Zhen, Jianyuan, Yuan, Mengfei
Format: Article
Language:English
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Summary:[Display omitted] •A novel DPR-SPNED process was established to treat municipal and nitrate sewages.•High PO43−-P and TN removal (97.5% and 90.8%) was obtained without extra carbon.•Dechloromonas, Candidatus Competibacter and Nitrosomonas dominated the DPR-SPNED.•Bottleneck of inefficient carbon use and high NH4+-N residues in DPRs were solved.•Integrating DPR-SPNED in WWTPs was proposed for further nutrient removal. The feasibility of coupling denitrifying phosphorus removal (DPR) with simultaneous partial nitrification-endogenous denitrification (SPNED) was investigated in a single-sludge sequencing batch reactor for deep-level nutrient removal from municipal and nitrate wastewaters. After 160-day operation, the DPR process simultaneously reduced most PO43−-P and NO3−-N anoxically, and the SPNED process achieved further total nitrogen (TN) removal at low dissolved oxygen condition with TN removal efficiency of 90.8%. The effluent NH4+-N, PO43−-P and TN concentrations were 1.0, 0.1 and 7.2 mg/L, respectively. Microbial analysis revealed that Dechloromonas (6.7%) dominated DPR process, whereas the gradually enriched Nitrosomonas (4.5%) and Candidatus Competibacter (6.8%) conducted SPNED process accompanied with sharply eliminated Nitrospirae (1.4%). Based on these findings, a novel strategy was proposed to achieve further nutrient removal in conventional treatment through integrating the DPR-SPNED process. As a result, ∼100% of extra carbon and ∼10% of oxygen consumptions would be reduced with satisfactory effluent quality.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.121690