Considering AA/O Oxidation Ditch aeration tank as seed sludge, the secondary flow high efficiency coagulating technology could be utilized to enwrap the immobilization of microbe as the high concentration flocculent granule sludge. The result shows that it makes the whole sludge system form as the condition of suspend sulfiding, while the last step of the experiment is to verificate the decomposing effects. Through the experiment，we could conclude that high concentration flocculent granule sludge（20 g/L） has a higher rate of biodegradation when comparing with the conventional activated sludge（3~5 g/L）while the HRT is 30 min in the system.