Operational strategies for nitrogen removal in granular sequencing batch reactor

Chen, Fang-yuan, Liu, Yong-Qiang, Tay, Joo-Hwa and Ning, Ping (2011) Operational strategies for nitrogen removal in granular sequencing batch reactor. Journal of Hazardous Materials, 189 (1-2), 342-348. (doi:10.1016/j.jhazmat.2011.02.041).

Abstract

This study investigated the effects of different operational strategies for nitrogen removal by aerobic granules with mean granule sizes of 1.5 mm and 0.7 mm in a sequencing batch reactor (SBR). With an alternating anoxic/oxic (AO) operation mode without control of dissolve oxygen (DO), the granular sludge with different size achieved the total inorganic nitrogen (TIN) removal efficiencies of 67.8–71.5%. While under the AO condition with DO controlled at 2 mg/l at the oxic phase, the TIN removal efficiency was improved up to 75.0–80.4%. A novel operational strategy of alternating anoxic/oxic combined with the step-feeding mode was developed for nitrogen removal by aerobic granules. It was found that nitrogen removal efficiencies could be further improved to 93.0–95.9% with the novel strategy. Obviously, the alternating anoxic/oxic strategy combined with step-feeding is the optimal way for TIN removal by granular sludge, which is independent of granule size

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Contributors

Author: Yong-Qiang Liu

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