氢氧化镁混凝性能及絮体特性  

Coagulation performance of magnesium hydroxide and floc properties

作　　者：封娜[1] 李文朴[1] 赵建海[1] 郭晓玉[1] 

机构地区：[1]天津市水质科学与技术重点实验室,天津城市建设学院环境与市政工程学院,天津300384

出　　处：《环境工程学报》2013年第5期1749-1753,共5页Chinese Journal of Environmental Engineering

基　　金：天津市自然科学基金资助项目(10JCYBJC05700)

摘　　要：以氢氧化镁作为混凝剂,不同浊度高岭土水样为研究对象,运用iPDA在线监测技术对混凝过程絮体形成进行监测,探求了操作条件对絮体特性和混凝过程的影响;同时讨论了FI值和浊度去除的关系。结果表明,当浊度分别为5、10和20 NTU时,最佳投加量分别为21.6、14.4和3.6 mg/L;随着pH的升高,FI指数增大,同时混凝剂的最佳投加量也逐步减小;随着慢速搅拌转速的增大,絮体破碎过程明显,FI指数降低;当转速为60 r/min时,浊度去除率最高。The coagulation performance and floc properties were investigated using magnesium hydroxide as coagulant under different operational conditions. On-line intelligent particle dispersion analyzer （IPDA） was used to determine the floc formation and growth in different turbidity of kaolin water sample. The relationship be-tween FI value and turbidity removal was then discussed with controlled experiments. The results showed that the optimum doses for coagulation were 21.6,14.4 and 3.6 mg/L for initial turbidity 5, 10 and 20 NTU, respective-ly. Higher pH led to higher FI value,and optimum dose decreased with the increase of pH. A greater slow mix-ing intensity significantly affected floc breakage and led to a decrease of FI. The turbidity removal efficiency is the highest when stirring rate is 60 r/min.

关 键 词：氢氧化镁 混凝 絮体 破碎 

分 类 号：X703[环境科学与工程—环境工程]