title: Nitritation and denitrifying phosphorus removal via nitrite pathway from domestic wastewater in a continuous MUCT process.
abstract: Nitritation and denitrifying P removal under mode of nitritation and nitrification was investigated in continuous MUCT process treating domestic wastewater. Nitritation was established through short hydraulic retention time to 6 h and low dissolved oxygen concentration of 0.3-0.5 mg/L. Nitritation was stabilized for 95 days with average nitrite accumulation ratio over 90%. Ammonia and total nitrogen removal under nitritation reached 99% and 83%, respectively, much better than complete nitrification. Real-time quantitative PCR assays presented that cell numbers and percentages of ammonia oxidizing bacteria (AOB) population had a clear correlation with nitrite accumulation ratios. The highest percentage of AOB was 13% of total bacterial population. P removal was mainly completed by denitrifying P removal of about 90% occurring in anoxic zone. The P removal efficiency under nitritation was 30% higher than that under complete nitrification. Denitrifying P removal under nitritation was highly beneficial to the treatment of wastewater with limiting carbon source.
authors.affiliation: Key Laboratory of Beijing for Water Environment Recovery, Department of Environmental Engineering, Beijing University of Technology, Beijing 100124, China. zengwei@bjut.edu.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Zeng
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Wang
authors.forename: Boxiao
authors.initials: B
authors.lastname: Li
authors.forename: Xinlong
authors.initials: X
authors.lastname: Bai
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
mesh_terms: D001419:Bacteria / Q000302:isolation & purification; D001483:Base Sequence; D015342:DNA Probes; D058440:Denitrification; D017404:In Situ Hybridization, Fluorescence; D058465:Nitrification; D010758:Phosphorus / Q000302:isolation & purification*; D060888:Real-Time Polymerase Chain Reaction; D012722:Sewage; D062065:Wastewater / Q000737:chemistry*
chemical_list: D015342:DNA Probes; D010758:Phosphorus; D012722:Sewage; D062065:Wastewater
keywords: Ammonia oxidizing bacteria; Denitrifying phosphorus removal; MUCT process; Nitritation; Real-time quantitative PCR