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Gradient dissolved oxygen created by limited aeration triggers ammonia assimilation: Insight into efficient nitrogen
Ying Wu1, Zheng Wang1, Xumeng Lin1
1College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
None:
The mainstream ammonia nitrogen (NH4+-N) removal process undergoes a transformation of intermediate nitrogen, which can even contribute to the greenhouse effect. This study constructed an ammonia assimilation biological system induced by the synergy of limited aeration and an external carbon source. Total nitrogen (TN) and NH4+-N removal in both batch and continuous flow limited aeration reactors improved stepwise with the rise in influent carbon-to-nitrogen (C/N) ratio. The total phosphorus removal efficiency was consistently above 90.0 % during the process. The simultaneous trends of carbon source consumption and nitrogen removal confirmed the occurrence of ammonia assimilation. DO gradient significantly suppressed nitrobacteria, while an external carbon source was conducive to enriching dominant bacteria related to assimilation. Mass balance analysis showcased that TN and carbon assimilation efficiencies achieved 91.0 % and 80.8 % under a C/N ratio of 7.8-8.1, which explained the conversion of NH4+-N to organic nitrogen. The ammonia assimilation system constructed by limited aeration had a potential for non-redox nitrogen removal and sludge resource utilization.
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