Alternating anoxic/oxic condition combined with step-feeding mode for nitrogen removal in granular sequencing batch reactors (GSBRs)

Chen, Fang-Yuan, Liu, Yong-Qiang, Tay, Joo-Hwa and Ning, Ping (2013) Alternating anoxic/oxic condition combined with step-feeding mode for nitrogen removal in granular sequencing batch reactors (GSBRs). Separation and Purification Technology, 105, 63-68. (doi:10.1016/j.seppur.2012.12.015).

Abstract

Alternating anoxic/oxic condition combined with step-feeding mode (AASF) has been reported to be an efficient method for nitrogen removal in granular sequencing batch reactor by our previous work. As carbon/nitrogen (C/N) ratio is one of the key factors impacting nitrogen removal efficiency, batch experiments using granules with a mean size of 1.3 mm under AASF were carried out for nitrogen removal from synthetic wastewater with C/N ratio of 5:1 and 3:1, respectively. It was found that over 90% nitrogen efficiency could be achieved for both C/N of 5 and 3. Furthermore, over 2 months operation was maintained for treating the wastewater with C/N ratio of 5:1 to investigate the long-term stability of granules under the new operational strategy. The results showed that AASF mode in GSBR could achieve over 85% nitrogen removal efficiency with great stability for long-term stability. This indicated that alternating anoxic/oxic condition combined with step-feeding mode is an effective strategy for nitrogen removal even from wastewater with low C/N ratio in granular sequencing batch reactor

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Contributors

Author: Yong-Qiang Liu

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