| AlCl3对细颗粒泥沙絮凝沉降的影响 |
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| 引用本文： | 陈洪松,邵明安.AlCl3对细颗粒泥沙絮凝沉降的影响[J].水科学进展,2001,12(4):445-449. |
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| 作者姓名： | 陈洪松 邵明安 |
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| 作者单位： | 中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西, 杨凌, 712100 |
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| 基金项目： | 中国科学院知识创新工程项目(KZCX2-411);国家自然科学基金项目(59879026)资助. |
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| 摘 要： | 铝类絮凝剂对细颗粒泥沙絮凝沉降有重要作用,常应用于浑水澄清、农业污水处理等研究中。在AlCl3浓度为0～1.7mmol/L,泥沙浓度为10g/L时,用吸管法研究了AlCl3对细颗粒泥沙絮凝沉降的影响,结果表明:在液面下同一深度,泥沙浓度随时间呈指数衰减;悬液经多次搅拌后再沉降,其沉速减缓;当AlCl3浓度为0.9～1.7mmol/L时,出现明显的清浑水交界面,交界面随时间等速下降,平均沉速为4.756cm/min,对应的絮团平均粒径为0.0315mm;土娄土絮凝临界粒径为0.027mm。
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| 关 键 词： | AlCl3 细颗粒泥沙 絮凝沉降 浑水澄清 |
| 文章编号： | 1001-6791(2001)04-0445-05 |
| 收稿时间： | 2000-08-21 |
| 修稿时间： | 2000年8月21日 |
Effects of AlCl3 on Fine Sediment Flocculation and Settling |
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| CHEN Hong-song,SHAO Ming-an.Effects of AlCl3 on Fine Sediment Flocculation and Settling[J].Advances in Water Science,2001,12(4):445-449. |
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| Authors: | CHEN Hong-song SHAO Ming-an |
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| Affiliation: | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China |
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| Abstract: | Aluminum flocculants have an important role in the flocculation and settling of fine sediment, and are often used to clear muddy water and treat agricultural waste water.In this paper,sediment concentration of 10 g/L is prepared in 1 000mL cylinder which contained AlCl3 solutions with concentration ranging from 0 to 1.7mmol/L.The relative sediment concentration at the depth of 20cm below suspension surface is measured with a 20mL pipette.The results show that the sediment concentration decreases exponentially with time at the same depth below suspension surface.Effects of electrolyte on fine sediment flocculation and settling become small and the mean velocity decreases obviously after the suspension is mixed completely for several times.At the given sediment concentration,the emergence of the interface between supernatant and sediment suspension depends on the electrolyte and its concentration.When AlCl3 concentration is higher than 0.9mmol/L,the obvious interface will appear.At the same time,the interface settles uniformly with time,and the mean particle size is 0.0315mm with the mean velocity of 4.756cm/min.The critical particle size to flocculate is 0.027mm. |
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| Keywords: | AlCl3 fine sediment flocculation and settling muddy water settlement |
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