高速回転ディスクによる余剰汚泥の高効率可溶化処理に関する研究 Advanced solubilization of excess sludge by high-speed rotary disk process.
In this study, solubilization of return sludge from secondary sedimentation tank (excess sludge) of wastewater treatment plant was investigated by passing the sludge through varying gaps (0.1-20 mm) between two high-speed rotary disks. The process was found to enhance the solubilization considerably. Significant decrease of particle size was observed after the first stage of the treatment. The solubilization rate of sludge, indexed as the ratio of DOC/TOC, increased considerably with the treatment time and it was observed that the greater solubilization could be achieved under the condition of higher sludge concentration. The solubilization remained high even though the gap between the two disks was increased to 20 mm. Furthermore, the possibility of improving the solubilization with only one disk was also investigated in this study. The results demonstrate the applicability of high-speed rotary disk process as an attractive novel process of excess sludge solubilization.
環境工学研究論文集 (38), 131-139, 2001