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| Cultivation and characters of the aerobic granules for ammonium and sulfide removal in SBR system |
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Abstract Cultivation and characters of the aerobic granules for ammonium and sulfide removal in a sequencing batch reactor were studied. The aerobic granules were cultivated using anaerobic granular sludge as seed sludge under controlled operational conditions in 30 days. The diameter of most of the aerobic granules was about 1~2mm and the SVI was 30~40mL/g. The granule was dominated by brevibacterium, and wrapped by a large number of filamentous bacteria. When the COD and NH4+-N loading were 1.65, 0.17 kg/(m3·d), and the S2- loading increased from 0.15 to 0.9 kg/(m3·d), the removal efficiencies of S2-, COD and NH4+-N were >99%, >80% and >98%, respectively. The reactor showed high removal capacity of NH4+-N under the high S2- concentration, which was possible due to the layered structure of aerobic granules or the characteristics that sulfide could be fast oxidized prior to the ammonium.
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Received: 08 September 2009
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