疏浚泥浆多级絮凝效能与絮体图像特征分析  

Analysis of image characteristics of multistage flocculation efficiency and floc morphology of dredged sediment

作　　者：程泽海 凌豪俊 洪瑜泽 张超杰[2] 杨关设 CHENG Zehai;LING Haojun;HONG Yuze;ZHANG Chaojie;YANG Guanshe(School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China;Key Laboratory of Hydraulic Disaster Prevention and Mitigation of Zhejiang Province,Hangzhou 310020,Zhejiang,China;Ningbo Raw Water Co.,Ltd.,Ningbo 315000,Zhejiang,China)

机构地区：[1]浙江科技大学土木与建筑工程学院,杭州310023 [2]浙江省水利河口研究院防灾减灾重点实验室,杭州310020 [3]宁波原水集团有限公司,浙江宁波315000

出　　处：《浙江科技大学学报》2024年第5期427-435,共9页Journal of Zhejiang University of Science and Technology

基　　金：宁波市水利科技项目(NSKB202218);浙江省水利厅科技项目(RA1910,RB2021)。

摘　　要：【目的】在水库疏浚工程中,亟须对产生的高含水率泥浆进行有效处理,故通过试验研究探索出一种泥浆多级絮凝的最佳方案,以实现泥浆快速高效脱水的目的。【方法】对有机高分子絮凝剂聚丙烯酰胺(polyacrylamide,PAM)、壳聚糖(chitosan,CTS)单掺及其与明矾-聚氯化铝(alum and polyaluminum chloride,KAl(SO 4)2-PAC)无机絮凝剂组合进行对比研究,分析不同工况下PAM、CTS多级絮凝的去浊效果、形态特征与絮凝机理。【结果】PAM方案四级絮凝达到了最佳效果,此时上清液浊度降低至1.6浊度值(nephelometric turbidity unit,NTU),粒径大于1000μm的成像面积占比达95.82%,且分形维数达到最大值1.786,生成的絮体形态规则且呈团聚状,为最佳絮凝方案;多级絮凝机理分析结果表明,多级絮凝方式可以有效提升絮凝效能。【结论】本试验成果可为疏浚工程絮凝过程中实现自动控制提供理论依据。[Objective]In the reservoir dredging project,it is urgent to effectively treat the high water content sediment,so an optimal scheme of multistage flocculation of sediment was explored through experimental research,in order to achieve the purpose of rapid and efficient dehydration of sediment.[Method]The organic polymer flocculant polyacrylamide(PAM),chitosan(CTS),and alum and polyaluminum chloride(KAl(SO 4)2-PAC)inorganic flocculant combination were compared to analyze the turbidity removal effect,morphological characteristics and flocculation mechanism of PAM and CTS multistage flocculation under different working conditions.[Result]The PAM scheme achieves the best effect of four-stage flocculation.At this time,the turbidity of supernatant is reduced to 1.6 nephelometric turbidity unit(NTU),the image area with particle size greater than 1000μm accounts for 95.82%,and the fractal dimension reaches the maximum value of 1.786;the flocs formed are regular and agglomerated,which is the best flocculation scheme;the results of multistage flocculation mechanism analysis show that the multistage flocculation method can effectively improve the flocculation efficiency.[Conclusion]The experimental results can provide a theoretical basis for the realization of automatic control in the flocculation process of dredging engineering.

关 键 词：疏浚泥浆 多级絮凝 上清液浊度 分形维数 絮凝机理 

分 类 号：TU411[建筑科学—岩土工程]