文献类型：期刊文献

英文题名：Optimizing particle translation and self-rotation by adjusting gravity-driven hydrocyclone inclination angle for separation and activation of granular sludge

作者：Tian, Jinyi[1,2];Gao, Yuqing[1,2];Ye, Xiaoyun[1,2];Huang, Fei[1,2];Zhao, Yuwei[1,2];Zhang, Tong[1,2];Zhao, Wei[1,2];Chen, Xiurong[1,2];Wang, Hualin[1,2];Kuang, Shibo[3]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[3]Monash Univ, Dept Chem & Biol Engn, ARC Res Hub Computat Particle Technol, Melbourne, Vic 3800, Australia

年份：2023

卷号：54

外文期刊名：JOURNAL OF WATER PROCESS ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001046637700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (52000070) and the National Key Research and Development Program of China (2019YFA0705800) .

语种：英文

外文关键词：Enhanced separation; Hydrocyclone; Particle rotation; Granular sludge; Wastewater treatment

摘要：Hydrocyclone was experimentally confirmed important for the granulation, separation, and activation of granular sludge. However, almost all the existing hydrocyclones are pressure-driven, requiring an intake pump to transport materials. Recent experiments revealed granular sludge breakdown occurred more in intake pumps than hydrocyclones. Therefore, we proposed the gravity-driven hydrocyclone operating like a waterfall to separate and activate the granular sludge, with the benefit of avoiding granular sludge crushing. CFD simulations were carried out to study the effects of inclination angle on the fluid flow and particle motion, and separation performance. Results show that the proposed gravity-driven hydrocyclone without intake pump can successfully activate and separate the 0.5-mm simulated granular sludge. Unlike a widely used pressure-driven hydrocyclone, the new hydrocyclone gives the separation efficiency and split ratio positively correlated with the inclination angle. Generally, the inclination angle does not significantly affect particle translation, particle self-rotation, and particle revolution. The maximum angular and linear velocities of particle self-rotation are mainly obtained in the cylindrical section, especially its upper part. The shear stress of the fluid micro cluster obtains its maximum near the wall, and the maximum wall shear stress is only 252 Pa.