Abstract: Taking the miscellaneous water plant sludge in the Guangzhou Universities Town Campus as researching object, experiment by anionic polymers（shortened form: AP）with bridging flocculation settlement, with online microscope camera technology and image analysis technology, study on the conditioning effect and the coagulation morphologic properties of the sludge under different dosage of AP and different pH value. The results showed that: (1) Adding 0.3 mg/L dosage of AP, the specific resistance of filtration(SRF) r drceases 2~3 times and the sedimentation rate v increases about 2 times; When the dosage of AP is greater than 0.3 mg/L, the conditioning effect will tend to mild; (2) The optimal dose of AP to the sludge which solid rate is 0.395 percent is 0.1~0.3 mg/L dosage of AP; (3) When the fractal dimension DV> 2, the dimension will increase with the increasing of the dosage, the floc will be denser, the fluid resistance will decline and finally the sink velocity will increase. More ever, DV<2, the dimension will decline with the increasing of the dosage, the interstitial rate will decline and finally the sink velocity will increase; (4) The water on neutral pH for conditioning sludge is lower quality than the water on AciditypH and Alkaline pH value.

Key words: water plant sludge; conditioning sludge; settling behaviors; flocculation; coagulation morphologic properties