Journal
BIORESOURCE TECHNOLOGY
Volume 330, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124961
Keywords
Airlift-aeration; Micro-granules; Partial nitritation-anammox (PN; A); Recovery; Stability
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [P16758]
- China Hunan Provincial Science & Technology Department [2020JJ4602, 2017SK2361]
- Hunan Provincial Education Department [20A002]
- Changsha Bureau of Science and Technology [kq2004073]
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The study found that a partial nitritation-anammox process can achieve stable and efficient nitrogen removal under certain operating conditions. The quantity of microbial consortia with good granularity in the system has a significant impact, leading to changes in microbial community structure.
The performance stability and its recovery mechanisms of a partial nitritation-anammox process were investigated. A one-stage airlift enhanced micro-granules (AEM) system was operated for 650 days continuously to treat 50 mg-NH4/L wastewater. During the stable stage, a high nitrogen removal efficiency of 72.7 ? 8.4% lasting for 230 days was successfully achieved under 0.28 L/min aeration rate and 0.10?0.20 mg/L dissolved oxygen (DO) concentration. A microbial consortium with good granularity appeared in red. The specific activity of anammox and ammonia oxidation increased to 1.02 and 0.93 g-N/g-VSS/d, respectively. Meanwhile, the microbial analysis showed the AEM system shifted the dominant microflora from Proteobacteria to Planctomycetes in which Candidatus Brocadia abundance reached a high of 35.0%. The results reveal that the long-term airlift-aeration
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