Abstract
A laboratory scale experiment was described in this paper to enhance biological nitrogen removal by simultaneous nitrification and denitrification (SND) via nitrite with a sequencing batch biofilm reactor (SBBR). Under conditions of total nitrogen (TN) about 30 mg/L and pH ranged 7.15–7.62, synthetic wastewater was cyclically operated within the reactor for 110 days. Optimal operation conditions were established to obtain consistently high TN removal rate and nitrite accumulation ratio, which included an optimal temperature of 31 °C and an aeration time of 5 h under the air flow of 50 L/h. Stable nitrite accumulation could be realized under different temperatures and the nitrite accumulation ratio increased with an increase of temperature from 15 to 35 °C. The highest TN removal rate (91.9%) was at 31 °C with DO ranged 3–4 mg/L. Process control could be achieved by observing changes in DO and pH to judge the end-point of oxidation of ammonia and SND.
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Acknowledgments
We thank Mr James Irish of South China University of Technology and Professor Xiaohong Wang of Guangzhou University for language editing on the manuscript. We are also grateful to the anonymous reviewers for their useful comments and suggestions. This work was supported by the National Natural Science Foundation of China (NSFC) (No. 50578044, 50278036).
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Zhang, L., Wei, C., Zhang, K. et al. Effects of temperature on simultaneous nitrification and denitrification via nitrite in a sequencing batch biofilm reactor. Bioprocess Biosyst Eng 32, 175–182 (2009). https://doi.org/10.1007/s00449-008-0235-3
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DOI: https://doi.org/10.1007/s00449-008-0235-3