Advanced nitrogen elimination from domestic sewage through two stage partial nitrification and denitrification (PND) coupled with simultaneous anaerobic ammonia oxidation and denitrification (SAD)
| Autor: | Yi Peng, Yueru Zhao, Yongzhen Peng, Hao Jiang, Qiong Zhang, Xiyao Li |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Denitrification Nitrogen Sewage chemistry.chemical_element Bioengineering Sequencing batch reactor Wastewater chemistry.chemical_compound Bioreactors Nitrate Ammonia Anaerobiosis Nitrite Waste Management and Disposal Effluent Renewable Energy Sustainability and the Environment business.industry General Medicine Pulp and paper industry Nitrification chemistry Anammox business Oxidation-Reduction |
| Zdroj: | Bioresource technology. 343 |
| ISSN: | 1873-2976 |
| Popis: | The start-up, efficient, and secure operation of Anammox treating low ammonia sewage, is an important research focus. In this study, a partial nitrification–denitrification coupled with simultaneous Anammox and denitrification (PND-SAD) process was achieved in sequencing batch reactor/up-flow anaerobic sludge bed (SBR-UASB). The key measures to maintain high efficiency PND were: (i) controlling dissolved oxygen in the SBR below 0.5 mg/L, which is not only conducive to PN, but also promotes the contribution of simultaneous nitrification and denitrification to nitrogen removal; (ii) monitoring the nitrate (NO3–-N) of SBR effluent and discharging sludge to wash out nitrate oxidation bacteria when the NO3–-N exceeds 1.0 mg/L. The nitrite accumulation rate reached 97.6%. SBR effluent and domestic sewage entered the UASB. Although Candidatus Brocadia only accounted for 0.8%, its contribution to nitrogen removal reached 76.8%. In PND-SAD system, the aerobic HRT was only 3.8 h, nitrogen removal efficiency up to 97.3%. |
| Databáze: | OpenAIRE |
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