水资源与水工程学报2023，Vol.34Issue(6)：124-129,146,7.DOI:10.11705/j.issn.1672-643X.2023.06.15
絮凝剂作用下黏性细沙絮凝沉降规律研究
Flocculation and sedimentation of cohesive fine-grained sediment under the action of flocculants
摘要
Abstract
Fine-grained sediment is commonly found in rivers,reservoirs,estuaries and offshore water bodies,and its flocculation and sedimentation is an integral part of mechanics of sediment transport.Here,experiments were conducted to monitor the flocculation and sedimentation process of cohesive fine-grained sediment with different concentrations of flocculants and sediment using a homemade experimental device,according to which the flocculation and sedimentation law of cohesive fine-grained sediment was analyzed and studied.The results show that among the flocculants,polyaluminum chloride(PAC)is relatively sta-ble,and its optimal dosage does not change with the change of sediment concentration,which remains at 0.08 g/L.As for cationic polyacrylamide(CPAM),it is the most sensitive to sediment concentration,and the optimal dosage concentration of the flocculant can be divided into three stable stages and two sensitive stages with the change of sediment concentration;the optimal dosage concentrations corresponding to differ-ent sediment concentrations are 0.08,0.10 and 0.12 g/L at the stable stages,respectively,and those at the sensitive stages can be selected using interval interpolation.In regards to anionic polyacrylamide(APAM),its optimal dosage concentration can be divided into two stable stages with the change of sedi-ment concentration,and the optimal dosage concentration does not change with the change of sediment con-centration during the stable stages,which is 0.08 and 0.10 g/L,respectively.In addtion,the optimal dos-age concentration of APAM at the sensitive stage can be selected by interval interpolation as well.APAM has the best flocculation effect,followed by CPAM,whereas PAC performs poorly.关键词
黏性细颗粒泥沙/泥沙絮凝沉降/絮凝剂/絮团沉速Key words
cohesive fine-grained sediment/sediment flocculation and sedimentation/flocculant/floc set-tling rate分类
水利科学引用本文复制引用
李青芝,张根广,孟若霖,王玺玥..絮凝剂作用下黏性细沙絮凝沉降规律研究[J].水资源与水工程学报,2023,34(6):124-129,146,7.基金项目
陕西省重点研发计划项目(2021SF-447) （2021SF-447）
