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Achieving mainstream nitrogen and phosphorus removal through Simultaneous partial Nitrification, Anammox, Denitrification, and Denitrifying Phosphorus Removal (SNADPR) process in a single-tank integrative reactor

Xu, Xiaochen, Qiu, Linyuan, Wang, Chao, Yang, Fenglin
Bioresource technology 2019 v.284 pp. 80-89
Dechloromonas, Nitrosomonas, Pseudomonas, ammonium, anaerobic ammonium oxidation, biofilm, carbon nitrogen ratio, chemical oxygen demand, denitrification, energy efficiency, microbial communities, nitrates, nitrifying bacteria, nitrogen, nitrogen content, phosphates, phosphorus, sewage, sewage treatment
Simultaneous partial Nitrification, Anammox, and Denitrification (SNAD) is a promising and energy-efficient nitrogen removal process, which is powerless to eliminate phosphorus and confronted the problem of excessive effluent nitrate once applied in municipal sewage treatment characterized with high C/N ratio (≥2). Herein, by coupling SNAD with denitrifying phosphorus removal (DPR) process in a single-tank reactor, a novel integrative process (termed as SNADPR) was designed to treat municipal sewage. The removal efficiencies of TN, PO43−-P, and COD under the optimized conditions (T = 30 °C, HRT = 24 h, DO = 0.45 mg/L) were 89.15 ± 2.19%, 92.93 ± 0.60%, and 99.17 ± 1.58%, respectively. Distinctive microbial community distribution was harvested, where anammox bacteria (AnAOB, Candidatus_Kuenenia and Candidatus_Brocadia) were mainly located in biofilm, whereas denitrifying polyphosphate-accumulating organisms (DPAOs, Dechloromonas and Pseudomonas) and ammonium oxidizing bacteria (AOB, Nitrosomonas) basically lived in suspended floc. The SRT separation between biofilm and floc was reached by conserving AnAOB-rich biofilm and termly discharging phosphorus-rich floc.