氯化镁复配氯化铁混凝性能及絮体特性  

Coagulation capacity and floc characteristics of magnesium chloride combining with ferric chloride

作　　者：李文朴[1,2] 郭晓玉[1,2] 封娜[1,2] 赵建海[1,2] 

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室.天津300384

出　　处：《工业水处理》2014年第5期41-45,共5页Industrial Water Treatment

基　　金：天津市自然科学基金项目(10JCYBJC05700);住房与城乡建设部研究开发项目(2012-K7-20)

摘　　要：以高岭土配水水样为研究对象,复配氯化镁和氯化铁,运用在线激光光散射测定仪iPDA监测混凝过程絮体形成,探讨了单独使用氯化镁和氯化铁及镁铁复配的混凝效果和絮体特性。结果表明:对20 NTU、pH=11.5水样,氯化镁、氯化铁最佳投加量分别为7.2、21 mg/L;氯化镁和氯化铁复配时,先投加氯化镁,间隔20 s投加氯化铁,混凝效果较好;在氯化镁最佳投加量7.2 mg/L,m(Fe3+)∶m(Mg2+)=1∶2时效果较好;镁铁复配时其FI明显大于单独作用时,发生了协同效应,弥补了单独使用镁盐混凝过程的不足。Floe can be formed by using Kaolin water distribution water sample as research target, combining magne sium chloride with ferric chloride by on-line intelligent Particle Dispersion Analyzer（iPDA）. The coagulation capacity and floc characteristics of using separate magnesium chloride and ferric chloride, and that of using combined magne sium-ferric composite are discussed. The results show that under conditions as follows：20 NTU and water sample pH=1 1.5, the optimum dosages of magnesium ions and ferric ions are 7.2 mg/L and 21 mg/L, respectively. As to combin ing magnesium chloride with ferric chloride, magnesium chloride should be added first, and then ferric chloride, at an interval of 20 s. In this case, the coagulation capacity is better. When the optimal dosage of magnesium ions is 7.2 rag/L, ferric ions 21 rag/L, and m （Fe^3＋） ：m （Mg^2＋） = 1：2, the coagulation capacity is better. When magnesium and ferric are combined,its FI is obviously greater than that of being used separately. Synergistic effect occurs, and, as a re-suit, the deficiency happened in the course of coagulation caused by usin~ maanesium salt singly can be made up.

关 键 词：氢氧化镁 混凝 絮体 氢氧化铁 

分 类 号：X703.1[环境科学与工程—环境工程]