A novel

economical and applicable equipment

high speed rotary disk (HSRD) was brought forward by the authors based on experimental research.As a physical pretreatment process of excess sludge reduction and resource recovery technology

the solubilization effects of HSRD upon excess sludge were investigated.According to the experimental results

besides grinding and hydrolytic enzyme effects

the fluid shearing force generated by the rotary disk contributed to the solubilization of the sludge.And the shearing force can only be generated by high rotating speed of the rotary disk with high MLSS concentration of the sludge.Moreover

the high solubilization rate (DOC/TOC>50%) could be achieved under the optimum condition: rotating speed 5000 r·min-1， MLSS of the sludge higher than 18000 mg·L-1， and treatment time 45 min.