文献类型：期刊文献

英文题名：Numerical study of the separation performance of granular sludge and activated sludge in gravity-driven cyclonic field

作者：Huang, Fei[1];Zhang, Yuantao[2,3];Tian, Jinyi[2,3]

机构：[1]Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Cont, Beijing 100084, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China

年份：2025

卷号：74

外文期刊名：JOURNAL OF WATER PROCESS ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001487727300002)】；

基金：This work was financially supported by the National Natural Science Foundation of China (52000070) .

语种：英文

外文关键词：Hydrocyclone; Granular sludge; Activated sludge; Separation performance; Numerical simulation

摘要：The cultivation of aerobic granular sludge (AGS) in a continuous flow process requires an external granular sludge and flocculent activated sludge separator to return the faster settling granular sludge. Experimental studies have confirmed that hydrocyclones are an effective solution for this purpose. This study employed CFD numerical simulations to investigate the operational performance of hydrocyclones at different installation angles. Furthermore, it explored the principles of gravity-driven hydrocyclone-enhanced separation of granular sludge and activated sludge, as well as the hydrocyclone-promoted granulation. The split ratio and separation efficiency are generally proportional to the installation angle, with the optimal angle range identified as -15 degrees similar to 15 degrees. Activated sludge shows a better flow separability with low velocity fluctuations, whereas granular sludge shows more pronounced velocity variations. The results indicate that the inclined gravity-driven hydrocyclone exhibit only a limited difference in separation performance between granular sludge and activated sludge. Therefore, the potential reason for the hydrocyclone-promoted granulation may not be the traditionally considered separative effect, but rather the particle motion induced by the hydraulic shear flow field.