强化混凝过程絮体形态对锑(V)去除效果的影响  

Effect of floc morphology on antimony( V) removal efficiency during enhanced coagulation

作　　者：贺维鹏[1] 高源[1] 童丽[1] 施周[1] 刘佳[2] 

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]中冶长天国际工程有限责任公司,长沙410007

出　　处：《环境工程学报》2015年第10期4773-4779,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51308199);湖南省自然科学基金资助项目(15JJ6021;13JJ6027);中央高校基本科研业务费资助项目(227201401073)

摘　　要：利用混凝烧杯试验法,考察聚硫酸铁(PFS)强化混凝去除五价锑(Sb(V))过程中不同混凝条件对絮体形态(包括粒度和结构)以及出水水质的影响。结果表明,絮体平均粒径和分形维数的变化主要取决于主导混凝机理,且能通过作用于混凝效果而影响沉后水中悬浮态Sb(V)含量,但对最终除Sb(V)效果(主要为溶解态)的影响极为有限;原水p H和PFS投量对Sb(V)的去除有重要影响,而温度和混凝搅拌强度的作用却较小,并且助凝剂PAM的投加会在一定程度上削弱去除效果。在实际运行中,还需尽量避免沉后水因微小絮体过多影响后续工艺的运行工况及出水水质等。A series of jar tests were conducted to explore floc morphology（ here,size and structure） and treated water quality under different coagulation conditions during removal process of antimony（ V） by polymericferric-sulfate（ PFS） enhanced coagulation. The results showed that both floc average size and fractal dimension mainly depend on its dominated coagulation mechanisms,and their effect on coagulation was proved to have influence on the suspended antimony（ V） concentration in settled water. However,the impact on final antimony（ V）（ mainly in dissolved state） removal efficiency was very limited. The results also indicated that,comparing to water temperature and coagulation mixing intensity,the impacts of both raw-water p H value and PFS dosage on the removal of antimony（ V） are much greater. Moreover,the addition of PAM（ coagulant aid） may weaken antimony（ V） removal efficiency to a certain extent. In practical operation,the number of small flocs in settled water should be minimized in order to guarantee the working condition of following process and the quality of treated water.

关 键 词：强化混凝 絮体形态 去除效果 五价锑(V) 聚硫酸铁(PFS) 

分 类 号：TU991.2[建筑科学—市政工程]