澄清工艺中絮体层的净水效能和运行机制研究  

Study on Operation Conditions and Formation Mechanism of Floc Layer in Clarification Process

作　　者：李梓楠 杨金月 杨晓英[1] 何坚[1] LI Zinan;YANG Jinyue;YANG Xiaoying;HE Jian(Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China)

机构地区：[1]复旦大学环境科学与工程系,上海200433

出　　处：《复旦学报（自然科学版）》2021年第5期587-595,共9页Journal of Fudan University：Natural Science

基　　金：雅本化学捐赠项目(SCH1829202E)。

摘　　要：稳定的絮体层是决定澄清池工艺效果的关键.国内外对于利用澄清工艺处理原水过程中的絮体层形成机理和净化效果研究十分有限.本文系统研究了表面负荷和絮体层高度分别对澄清柱絮体层形成和处理效果的影响,并进一步分析了絮体层的形成机制.结果表明,澄清系统相对于传统的沉淀工艺,可有效提高对原水CODMn和藻类的去除率.在表面负荷在2.16~3.60 m/h工况下,澄清系统出水浊度均低于1.0 NTU,计算预测表面负荷大于3.77 m/h和小于1.51 m/h时出水浊度将大于1.0 NTU;表面负荷过低亦会引起出水水质恶化.当絮体层高度小于0.9 m,澄清工艺对浊度的处理效果开始出现下降,絮体受到水流剪切力的影响而无法形成稳定的絮体层,出水浊度大于1.0 NTU.The stable floc layer determines the process efficiency of the clarifier.In domestic and abroad,limited research was published about the formation mechanism and purification efficiency of the floc layer during the raw water clarification treating process.This study focused on how surface load and the floc layer height affect the formation and treatment efficiency of the floc layer of clarifier,respectively,and the formation mechanism of the floc layer was further analyzed.The results showed that compared with the traditional sedimentation process,the clarification system could effectively improve the removal rate of CODMn and algae in raw water.When the surface load was 2.16—3.60 m/h,the effluent turbidity of the clarification system was lower than 1.0 NTU.The calculation and prediction showed that when the surface load was greater than 3.77 m/h and less than 1.51 m/h,the effluent turbidity would exceed 1.0 NTU;if the surface load was too low,the effluent quality would deteriorate.When the height of the floc layer was less than 0.9 m,the treatment effect of the clarification process on turbidity begins to decline.The floc was affected by the flow shear force and could not form a stable layer,and the effluent turbidity greater than 1.0 NTU.

关 键 词：澄清工艺 表面负荷 絮体层高度 絮体层通量 

分 类 号：X703.3[环境科学与工程—环境工程]