Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579378 | Journal of Hazardous Materials | 2011 | 7 Pages |
Abstract
This study investigated the effects of different operational strategies for nitrogen removal by aerobic granules with mean granule sizes of 1.5Â mm and 0.7Â 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 2Â 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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Authors
Fang-yuan Chen, Yong-Qiang Liu, Joo-Hwa Tay, Ping Ning,