CAJ | 학술논문

采用聚合氯化铝-聚二甲基二烯丙基氯化铵(PAC-PDMDAAC)复合混凝剂处理腐殖酸-高岭土模拟水样,对混凝出水进行超滤处理,研究了混凝剂投药量及进水pH值对处理效果的影响;出水用NaClO溶液进行了氯消毒实验,用一级模型进行了氯衰减数据拟合,计算得出了快速反应物与慢速反应物的初始浓度.结果表明,在要求出水中消毒副产物前驱物浓度最小的前提下,混凝与混凝-超滤所要求的投药量及进水pH值有所不同.混凝过程中残余絮体的粒径分布显示,残余絮体的粒径较小且分布集中时,混凝出水中消毒副产物前驱物浓度最低;残余絮体的粒径在粒径较小的区域有一定的分布,在粒径较大的区域有较高体积百分数时,混凝-超滤出水中消毒副产物前驱物浓度最低.
채용취합록화려-취이갑기이희병기록화안(PAC-PDMDAAC)복합혼응제처리부식산-고령토모의수양,대혼응출수진행초려처리,연구료혼응제투약량급진수pH치대처리효과적영향;출수용NaClO용액진행료록소독실험,용일급모형진행료록쇠감수거의합,계산득출료쾌속반응물여만속반응물적초시농도.결과표명,재요구출수중소독부산물전구물농도최소적전제하,혼응여혼응-초려소요구적투약량급진수pH치유소불동.혼응과정중잔여서체적립경분포현시,잔여서체적립경교소차분포집중시,혼응출수중소독부산물전구물농도최저;잔여서체적립경재립경교소적구역유일정적분포,재립경교대적구역유교고체적백분수시,혼응-초려출수중소독부산물전구물농도최저.
The synthetic water containing humic acid and kaolin was treated using composite coagulant polyaluminum chloride and polydimethyldiallylammonium chloride (PAC-PDMDAAC) firstly.Then,the water treated by coagulation was filtrated using ultrafiltration membrane.The effect of coagulant dosage and pH on the water treatment efficiency was investigated.Disinfection was carried out for the water treated by coagulation or by combined coagulation-ultrafiltration processes using NaClO solution as disinfectant.The residual chlorine data was fitted using first-order chlorine decay model and the initial concentrations of fast reacting agents and slow reacting agents were obtained by calculating the residual chlorine data using the software AQUASIM.For the purpose of lowest concentration of precursors of disinfection by-products,there existed different coagulant dosages and pH for coagulation and coagulation-ultrafiltration processes.For the water treated by coagulation,the concentration of precursors of disinfection by-products was the lowest when the flocs size was small and the flocs size behaved a concentrated distribution.While for the water treated by coagulationultrafiltration,the concentration of precursors of disinfection by-products was the lowest when the flocs size distribution curve had two peaks and the volume percentage of floes with larger particle size was higher.