摘要
采用复合絮凝法处理聚醚废浓缩液,考察了絮凝剂种类、复配比、水力条件等因素对絮凝效果的影响,并探讨了絮凝剂与固体悬浮物的作用机制。实验结果表明:与单独使用聚合氯化铝(PAC)和阳离子型聚丙烯酰胺(CPAM)相比,二者复配使用时可得到更高的浊度去除率和液体回收率;在PAC与CPAM的复配比(质量比)10.0∶1、絮凝剂总用量600 mg/L、先加PAC后加CPAM、慢速搅拌转速60 r/min、慢速搅拌时间15 min、沉淀时间1.5 h的最佳絮凝条件下,浊度去除率高达97.36%,上清液固体悬浮物质量浓度降至34.82 mg/L,液体回收率为95.20%。絮体的微观结构和Zeta电位分析表明:PAC和CPAM复配使用时,形成的絮团粒径大,密实性高,在黏度较大的聚醚废浓缩液中沉降性好,且形成的沉淀层紧密。
The composite flocculation method was used to treat polyether waste concentrated solution,the effects of flocculant type,compounding ratio and hydraulic conditions on flocculation were investigated,and the mechanism of flocculant interaction with suspended solids was explored.The experimental results show that:Compared with using polyaluminium chloride(PAC)and cationic polyacrylamide(CPAM)alone,higher turbidity removal rate and liquid recovery can be obtained when used in combination;Under the optimal flocculation conditions of compounding ratio of PAC to CPAM(mass ratio)10.0∶1,total flocculant amount 600 mg/L,PAC added first and then CPAM,slow stirring speed 60 r/min,slow stirring time 15 min,and sedimentation time 1.5 h,the turbidity removal rate is as high as 97.36%,the mass concentration of suspended solids in supernatant is reduced to 34.82 mg/L,and the liquid recovery is 95.20%.The microstructure and zeta potential analysis results of the flocs show that when PAC and CPAM are used in combination,the flocs form have large particle size and high compactness,and settle well and form a compact precipitation layer in the polyether waste concentrated solution with high viscosity.
作者
朱立新
邓宗义
孙体昌
韩文丽
李永峰
ZHU Lixin;DENG Zongyi;SUN Tichang;HAN Wenli;LI Yongfeng(Nanjing Academy of Resources and Ecology Sciences,Nanjing 210000,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Yangtze River Innovation Center for Ecological Civilization,Nanjing 210019,China;Dafeng Port Economic Development Zone Branch,Yancheng Dafeng Ecological and Environmental Bureau,Yancheng 224145,China)
出处
《化工环保》
CAS
CSCD
北大核心
2023年第6期788-795,共8页
Environmental Protection of Chemical Industry
基金
“扬子江菁英计划”项目(2020)。
关键词
絮凝剂复配
聚醚废浓缩液
聚合氯化铝
阳离子型聚丙烯酰胺
flocculant compounding
polyether waste concentrated solution
polyaluminum chloride
cationic polyacrylamide
