高聚聚硫氯化铝混凝去除水中腐殖酸

第9卷第5期环境工程学报Vol．9，No．52015年5月ChineseJournalofEnvironmentalEngineeringMay2015高聚聚硫氯化铝混凝去除水中腐殖酸吴珍1，2，3张盼月3*李继定1张弦2叶捷3(1．清华大学化学工程系，北京100084;2．鄂尔多斯市紫荆创新研究院水资源与环境治理研究中心，鄂尔多斯017000;3．湖南大学环境科学与工程学院，长沙410012)摘要采用快速加碱法制备了分别以Al13和Al30为主要水解形态的聚合氯化铝PAC-Al13和高聚聚合氯化铝PAC-Al30。通过向PAC-Al30中引入SO2－4/Al3+摩尔比为0.06的SO2－4离子，制得高聚聚硫氯化铝SPAC-Al30。激光散射粒径分析以及Ferron逐时络合比色结果表明，加入SO2－4后SPAC-Al30的平均粒径增大为4.85nm，高聚合水解形态Alc含量分别比PAC-Al13和PAC-Al30提高52.7%和17.5%。ζ电位分析以及烧杯混凝实验结果表明，SPAC-Al30的电中和能力不及PAC-Al30和PAC-Al13，混凝去除水中腐殖酸的效果却有显著提高，且由于SPAC-Al30较为温和的电中和性能，在混凝剂投量较高时不易出现再稳现象。SPAC-Al30的纳米级分子尺寸和高聚合水解形态有利于其发挥更优的吸附架桥和网捕卷扫作用，SPAC-Al30是去除水中腐殖酸的一种新型高效混凝剂。关键词高聚聚合铝强化混凝腐殖酸水解形态中图分类号X703.1文献标识码A文章编号1673-9108(2015)05-2091-04CoagulationcharacteristicsofsulfatedpolyaluminiumchlorideSPAC-Al30forhumicacidremovalfromwaterWuZhen1，2，3ZhangPanyue3LiJiding1ZhangXian2YeJie3(1．DepartmentofChemicalEngineering，TsinghuaUniversity，Beijing100084，China;2．DepartmentofWaterResources＆EnvironmentalTreatment，RedbudInnovationInstitute，Ordos017000，China;3．CollegeofEnvironmentalScienceandEngineering，HunanUniversity，Changsha410012，China)AbstractPolyaluminumchloridePAC-A1l3withahighA1l3contentandPAC-Al30withahighAl30contentwereprepared．Sulfatedpolyaluminiumchloride(SPAC-Al30)withaSO2－4/Al3+molarratioof0．06wasob-tainedbyintroducingSO2－4intoPAC-Al30．LaserparticlesizeanalysisshowedthatthemeansizeofSPAC-Al30wasabout4．85nm，andFerroncolorimetryanalysisshowedthatAlcspeciescontentinSPAC-Al30were52.7%and17.5%higherthanthatinPAC-Al13andPAC-Al30respectively．SPAC-Al30possessedaweakerelectricneu-tralizationcapacityaccordingtotheZetapotentialanalysis，however，itshowednotonlymoreeffectivecoagula-tionefficiencyatlowdosagebutalsomorestabletoremovehumicacids(HAs)inabroaderpHrangecomparedtoPAC-A1l3andPAC-Al30coagulants．ThenanometermoleculardiameterandhighpolymerhydrolysisspeciesofSPAC-Al30mayhelpitplayabetteradsorptionbridgingandsweepingrole．SPAC-Al30isanewandefficientco-agulantforHAsremoval．Keywordssulfatedpolyaluminiumchloride;enhancedcoagulation;humicacid;hydrolys