壳聚糖类复凝聚胶体对高岭土悬浊液的混凝特性研究  

Study on the coagulation properties of chitosan complex coagulants on Kaolin suspension

作　　者：谷振超 丁昌智 陈莉荣[1] GU Zhen-chao;DING Chang-zhi;CHEN Li-rong(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014000,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014000

出　　处：《应用化工》2021年第5期1272-1275,1281,共5页Applied Chemical Industry

基　　金：内蒙古自治区自然科学基金项目(2018BS02006)。

摘　　要：采用壳聚糖-羧甲基纤维素钠(CS-CMC)、壳聚糖-海藻酸钠(CS-ALG)原位生成混凝剂,并通过烧杯实验研究其对高岭土悬浊液的混凝特性及机理。探究混凝剂投加量、水力条件、pH值、悬浊液浓度对混凝效果的影响。结果表明,高岭土悬浊液pH为5,CS-CMC投加量各20 mg/L时混凝效果达到最佳,沉降2 min后浊度去除率达到98.13%。高岭土悬浊液pH为4,CS-ALG投加量为CS投加10 mg/L、ALG投加20 mg/L时混凝效果达到最佳,沉降4 min后浊度去除率达到97.87%。CS-CMC、CS-ALG与PAC相比具有用量少、沉降时间短等优点。絮体Zeta电位测定、絮体粒径测定结果表明,两种混凝剂的主要作用机理为电性中和,同时存在网捕作用与吸附架桥作用。Chitosan-carboxymethyl cellulose sodium(CS-CMC)and chitosan-sodium alginate(CS-ALG)are used to generate coagulant in situ.The beaker experiment was used to study the coagulation characteristics and mechanism of Kaolin suspension.The effects of coagulant dosage,hydraulic conditions,pH value and suspension concentration on the coagulation effect were investigated.The results showed that,Kaolin suspension pH 5,the best coagulation effect when CS-CMC dosage was 20 mg/L each,removal rate of turbidity reaches 98.13%after 2 min of sedimentation.Kaolin suspension pH 4,the dosage of CS-ALG is the best when the dosage of CS is 10 mg/L and ALG is 20 mg/L.After 4 min of sedimentation,the turbidity removal rate reached 97.87%.Compared with PAC,CS-CMC and CS-ALG have the advantages of less dosage and shorter settling time.The results of Zeta potential measurement and particle size measurement showed that the main mechanism of the two coagulants is electrical neutralization,and the adsorption bridging and net-catching functions assist.

关 键 词：壳聚糖 聚阴离子 复凝聚 混凝 高岭土悬浊液 

分 类 号：TQ31[化学工程—高聚物工业] X131.2[环境科学与工程—环境科学]