Abstract
By cultivating and observing the formation process of granular sludge and the characteristics of mature aerobic granular sludge, the formation mechanism of aerobic granular sludge and the structure of the granular sludge are studied. After 60 days, the removal rate of COD and NH3-N of aerobic granular sludge is much higher than that of traditional flocculation sludge, and both of them can be stabilized up to 90%. The removal rate of COD is about 90% and the removal rate of NH3-N at 45d is 95% in final reactor, which enhances the effect of wastewater purification greatly. Due to the compact structure of aerobic granular sludge, the density is much larger than that of traditional activated sludge, and its high activity and the short sedimentation time contribute to much higher sedimentation rate than that of flocculation sludge.
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