不同形态藻类的混凝效果及絮体特性  

The coagulation effect and floc characteristics of different forms of algae

作　　者：姚娟娟[1] 龚丹 方艳娟 张智[1] YAO Juanjuan;GONG Dan;FANG Yanjuan;ZHANG Zhi(College of Environment and Ecology,Chongqing University,Chongqing 400045,P.R.China;Architectural Design and Research Institute of Guangdong Province,Guangzhou 510010,P.R.China)

机构地区：[1]重庆大学环境与生态学院,重庆400045 [2]广东省建筑设计研究院,广州510010

出　　处：《重庆大学学报》2022年第4期134-142,共9页Journal of Chongqing University

基　　金：国家自然科学基金(51778082);国家自然科学基金青年科学基金(51108481)。

摘　　要：采用氯化铁和硫酸铝作为混凝剂,分别研究了不同形态结构的铜绿微囊藻、针杆藻和水华鱼腥藻的混凝效果及絮体特性。结果表明:在铁盐、铝盐混凝剂不同投加量下,铁盐对3种藻的混凝去除效果优于铝盐;3种藻在铁盐和铝盐各自达到最佳混凝效果时的混凝剂投加量:铁盐>铝盐。铜绿微囊藻的整体混凝效果最差,针杆藻的最好。相比于铝盐,3种藻在采用铁盐混凝时形成絮体的分形维数值更大;针杆藻絮体的整体分形维数最大(最大值:1.72),铜绿微囊藻的最小(最大值:1.17),表明藻种形态对混凝絮体结构的影响。3种藻在采用铁盐混凝时的絮体粒径(d 50)均大于铝盐絮体,絮体强度和恢复因子小于铝盐絮体的对应值。当采用铁盐混凝剂时,铜绿微囊藻絮体d 50的最大值(632μm)小于针杆藻(765μm)和水华鱼腥藻(777μm);针杆藻絮体的恢复因子最大(26.54%),水华鱼腥藻的恢复因子最小(11.04%)。3种藻絮体到达等电点的铁盐投加量大于铝盐投加量,藻絮体Zeta电位可用于分析藻类混凝时最佳去除率对应的投加量。铜绿微囊藻以电性中和混凝机制为主,吸附架桥和网捕卷扫机制则可能对水华鱼腥藻和针杆藻的絮凝作用更重要。The coagulation effect and floc characteristics of M.aeruginosa,Synedra and Anabaena were studied,separately,by using ferric chloride and aluminum sulfate coagulants.The results show that the ferric salt has better coagulation and removal effect on the three algae species than aluminum salt does,and the three algae species achieves best coagulation effect when the ratio of coagulant is ferric salt coagulant>aluminum salt coagulant.The M.aeruginosa has the worst coagulation effect,and Synedra has the best under different dosages of ferric and aluminum salts.Compared with the use of aluminum salt,the three algae flocs coagulated by iron salt have larger fractal dimension.The fractal dimension value of Synedra is the largest(the maximum value:1.72)and that of M.aeruginosa is the smallest(the maximum value:1.17),indicating the effect of algae morphology on the flocs structure.The particle size(d 50)of the flocs of the three algae species when coagulated with ferric salt is larger than that of the flocs using aluminum salt,and the strength and recovery factor of the ferric salt flocs are smaller than those of the aluminum salt flocs.The maximum value of d 50 of M.aeruginosa floc(632μm)is smaller than that of Synedra floc(765μm)and Anabaena floc(777μm)when using ferric salt.Synedra has the largest recovery factor of 26.54%,and Anabaena has the smallest recovery factor of 11.04% when using ferric salt.When the three algal flocs reach the isoelectric point,the dosage of ferric salt is greater than that of aluminum salt.The zeta potential of algal floc can be used to analyze the dosage corresponding to the optimal removal rate of algae coagulation.The M.aeruginosa flocculation is mainly electroneutralized,while the adsorption bridge and netting may play a more important role in the flocculation of Anabaena and Synedra.

关 键 词：藻 形态 絮体特性 混凝 机理 

分 类 号：TU991.2[建筑科学—市政工程]