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

Xiaochen Xu; Linyuan Qiu; Chao Wang; Fenglin Yang

doi:10.1016/j.biortech.2019.03.109

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

Bioresour Technol. 2019 Jul:284:80-89. doi: 10.1016/j.biortech.2019.03.109. Epub 2019 Mar 22.

Authors

Xiaochen Xu¹, Linyuan Qiu², Chao Wang³, Fenglin Yang²

Affiliations

¹ Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environment Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China. Electronic address: xxcep@dlut.edu.cn.
² Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environment Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China.
³ Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing 100084, China.

PMID: 30925426
DOI: 10.1016/j.biortech.2019.03.109

Abstract

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, PO₄^3--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.

Keywords: Anammox; Mainstream; Microbial community; SNADPR.

MeSH terms

Ammonium Compounds / metabolism
Biofilms
Bioreactors* / microbiology
Denitrification
Nitrates / metabolism
Nitrification
Nitrogen / metabolism*
Phosphorus / metabolism*
Planctomycetales / metabolism*
Sewage / microbiology

Substances

Ammonium Compounds
Nitrates
Sewage
Phosphorus
Nitrogen