Cultivation of aerobic granules for simultaneous nitrification and denitrification by seeding different inoculated sludge

Article type: Research Article

Authors: WANG, Fang | YANG, Feng-lin | LIU, Yi-hui | ZHANG, Xing-wen

Affiliations: School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116023, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: Cultivation of aerobic granules for simultaneous nitrification and denitrification in two sequencing batch airlift bioreactors was studied. Conventional activated floc and anaerobic granules served as main two inoculated sludge in the systems. Morphological variations of sludge in the reactors were observed. It was found that the cultivation of aerobic granules was closely associated with the kind of inoculated sludge. Round and regular aerobic granules were prevailed in both reactors, and the physical characteristics of the aerobic granules in terms of settling ability, specific gravity, and ratio of water containing were distinct when the inoculate sludge was different. Aerobic granules formed by seeding activated floc are more excellent in simultaneous nitrification and denitrification than that by aerobic granules formed from anaerobic granules. It was concluded that inoculated sludge plays a crucial role in the cultivation of aerobic granules for simultaneous nitrification and denitrification.

Keywords: aerobic granulation, inoculated sludge, nitrification, denitrification, inner structure, sludge morphology

Journal: Journal of Environmental Sciences, vol. 17, no. 2, pp. 268-270, 2005