| 氢氧化镁混凝性能及絮体特性 |
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| 引用本文： | 封娜,李文朴,赵建海,郭晓玉.氢氧化镁混凝性能及絮体特性[J].环境工程学报,2013,7(5):1749-1753. |
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| 作者姓名： | 封娜 李文朴 赵建海 郭晓玉 |
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| 作者单位： | 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 |
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| 基金项目： | 天津市自然科学基金资助项目(10JCYBJC05700) |
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| 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。
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| 关 键 词： | 氢氧化镁 混凝 絮体 破碎 |
Coagulation performance of magnesium hydroxide and floc properties |
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| Feng N,Li Wenpu,Zhao Jianhai and Guo Xiaoyu.Coagulation performance of magnesium hydroxide and floc properties[J].Techniques and Equipment for Environmental Pollution Control,2013,7(5):1749-1753. |
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| Authors: | Feng N Li Wenpu Zhao Jianhai and Guo Xiaoyu |
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| Institution: | Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China;Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China;Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China;Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Institute of Urban Construction, Tianjin 300384, China |
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| Abstract: | 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 between 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, respectively. Higher pH led to higher FI value,and optimum dose decreased with the increase of pH. A greater slow mixing 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. |
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| Keywords: | magnesium hydroxide coagulation floc breakage |
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