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Abstract The nitrogen removal performance of granules R1 (1~2.5mm) and flocs R2 (0~0.25mm) retrieved from SNAD (simultaneous partial nitrification, anaerobic ammonium oxidization and denitrification)reactor was investigated by serum bottle batch tests under 30℃. To the granules, the aerobic ammonium and aerobic nitrite oxidation activity were 0.166and 0kgN/(kg VSS×d), respectively. The specific anammox activity, denitrification activity over nitrite, denitrification activity over nitrate were 0.158, 0.105, 0.094kgN/(kg VSS×d), respectively. To the flocs, the aerobic ammonium and aerobic nitrite oxidation activity were 0.180 and 0kgN/(kg VSS×d), respectively. The specific anammox activity, denitrification activity over nitrite, denitrification activity over nitrate were 0.026, 0.096, 0.108kgN/(kg VSS×d), respectively. Both granules and flocs exhibited good partial nitrification activity and denitrification activity. The specific anammox activity of granules was obvious while the flocs showed little specific anammox activity. The SEM indicated that the bacteria in the outer part of the SNAD granule were mainly short rod-shaped and spherical. In the inner part of the SNAD granule, the bacteria were mainly crater-shaped. In flocs, the bacteria were mainly short rod-shaped, spherical and crater-shaped.
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Received: 07 March 2015
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