Nitritation and denitrifying phosphorus removal via nitrite pathway from domestic wastewater in a continuous MUCT process
2013
Zeng, Wei | Wang, Xiangdong | Li, Boxiao | Bai, Xinlong | Peng, Yongzhen
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 6h and low dissolved oxygen concentration of 0.3–0.5mg/L. Nitritation was stabilized for 95days 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.
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