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The research exploring the restorative effects of Ammonia nitrogen, the Chemical oxygen demand concentration, Hydraulic shear force, adding sludge and Activated carbon powder for disintegrating the aerobic granular sludge, got the results firstly that the influent COD concentration and activated sludge and activated carbon had great influence on the restorative effects, but the effect of a single repair method was not unsatisfactory; secondly, taking the way of responding surface analysis concluded that the restoration of coupling was the best way with the Influent COD of 340mg/L, the activated carbon of 4.64g/L and activated sludge quality concentrations 2900mg/L. With 17days of operation, the disintegration of AGS has gotten the positive restorative effects. Observing the morphology from the appearance and scanning electron microscopy, it was found that the filamentous bacteria have dominated the surface of AGS,. simultaneously, the pore and fissure were greatly reduced, and the sludge formed new AGS with activated carbon as crystal nucleusThe particle size increased rapidly from (0.89±0.5)mm to (2.19±0.4)mm, the rate of ammonia oxidation (in LVSS) has been increased from 2.49mg/(g•h) to 3.18mg/(g•h), which proved that the restoration of coupling had the positive and rapid effect on disintegrating AGS. © 2018, Editorial Board of China Environmental Science. All right reserved.
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