Cultivation of aerobic granules for simultaneous nitrification and denitrification by seeding different inoculated sludge.
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.
Wang
Fang
F
School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116023, China.
Yang
Feng-lin
FL
Liu
Yi-hui
YH
Zhang
Xing-wen
XW
D001420:Bacteria, Aerobic / Q000378:metabolism* / Q000648:ultrastructure; D019149:Bioreactors; D005427:Flocculation; D008855:Microscopy, Electron, Scanning; D009584:Nitrogen / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*
D012722:Sewage; D009584:Nitrogen