The effects of additional mature aerobic granules to the formation of aerobic granules were investigated by inoculating activated sludge and feeding synthetic municipal wastewater. The change of granular configuration and diameter was observed during the cultivation process. The average sludge volume diameter rose from 0.10, 0.16 cm to 0.23,0.30 cm, and finally was up to 0.28, 0.43 cm at the 1th, 7th and 14th day respectively. Small granules with diameter from 0.1 to 0.3 cm had a relative rapid formation speed in both reactors, whereas, the differences of the formation speed of big granules were obvious. There were filamentous bacteria winging and floc sludge adhering to the surface of small granules through cultivation process. The results showed aerobic granules could form more rapidly when 15% mature aerobic granules were put into the reactor.
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