| 低温条件下絮体破碎再絮凝去除水中颗粒的研究 |
| |
| 引用本文： | 俞文正,杨艳玲,卢伟,李圭白.低温条件下絮体破碎再絮凝去除水中颗粒的研究[J].环境科学学报,2009,29(4):791-796. |
| |
| 作者姓名： | 俞文正 杨艳玲 卢伟 李圭白 |
| |
| 作者单位： | 1. 哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨,150090
2. 北京工业大学建筑工程学院,北京,100022 |
| |
| 基金项目： | 国家科技重大专项资助项目 |
| |
| 摘 要： | 为了了解低温条件下絮体的形成/破碎/再絮凝过程在适当条件下对絮凝去除水中颗粒物的强化效果,采用PDA2000透光率脉动检测仪对絮凝破碎再絮凝过程进行了在线监测.研究结果表明,当电中和机理占主导作用时(混凝剂投加量小于0.1 mmol·L-1),絮体破碎后能重新絮凝,絮体大小能恢复到破碎之前;而当网捕卷扫机理占主导作用时(混凝剂投加量大于0.2 mmol·L-1),絮体的恢复情况不如电中和条件,再絮凝能力降低.投加适量的腐殖酸会增加絮体破碎前后的分形维数,但过量的腐殖酸则会降低破碎前后絮体的分形维数.絮体破碎再絮凝后其分形维数比破碎前高.腐殖酸的投加量并不会明显影响絮凝和破碎后再絮凝的FI指数.电中和絮体破碎前初始絮凝时间越长破碎后沉后水浊度越低,破碎后其浊度会比破碎前显著减小.较低投量的铝盐就能使得沉后水浊度降到很低,因此可以降低混凝剂投量而达到更好的水处理效果.
|
| 关 键 词： | 絮体破碎 重新絮凝 FI指数 电中和 网捕卷扫 |
| 收稿时间： | 2008/5/21 0:00:00 |
| 修稿时间： | 2008/9/14 0:00:00 |
Removal of particles through floc breakage and re-growth at low temperature |
| |
| YU Wenzheng,YANG Yanling,LU Wei and LI Guibai.Removal of particles through floc breakage and re-growth at low temperature[J].Acta Scientiae Circumstantiae,2009,29(4):791-796. |
| |
| Authors: | YU Wenzheng YANG Yanling LU Wei and LI Guibai |
| |
| Institution: | YU Wenzheng1,YANG Yanling2,LU Wei1,LI Guibai1 1.State Key Laboratory of Urban Water Resource , Environment,Harbin Institute of Technology,Harbin 150090 2.College of Architecture , Civil Engineering,Beijing University of Technology,Beijing 100022 |
| |
| Abstract: | The efficiency of coagulation and flocculation can be significantly improved through floc breakage and re-growth under appropriate conditions.At low temperature,the formation,breakage,and re-growth of flocs formed by kaolin with aluminum sulfate(alum')were investigated with PDA 2000 to explore the reversibility of broken flocs.There was a full re-growth of flocs when they were coagulated by charge neutralization;but when coagulated by sweep coagulation,the floc break-up process was distinctly irreversible.T... |
| |
| Keywords: | floc breakage re-aggregation FI value charge neutralization sweep flocculation |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《环境科学学报》浏览原始摘要信息 |
| 点击此处可从《环境科学学报》下载免费的PDF全文 |
|
