National Taiwan Ocean University Institutional Repository:Item 987654321/25421
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题名: Flocculation of particles by fluid shear in buffered suspensions
作者: C.H.Tsai;I.Q.Hu
贡献者: NTOU:Department of Marine Environmental Informatics
國立臺灣海洋大學:海洋環境資訊系
关键词: Flocs;median size;fine-sediments;pH;shear;size spreading;probability of cohesion;electrophoretic mobility
日期: 1997-10
上传时间: 2011-10-20T08:23:10Z
出版者: Water Air and Soil Pollution
摘要: abstract:Flocculation experiments were carried out by using a Collette type of viscometer for applying uniform fluid shears to freshwater suspensions of estuarine fine-grained particles. The suspensions were buffered by a malcic acid/ammonium hydroxide system. The objectives of the study are to investigate the relationship between the steady-state sires of flocculated particles and applied shear at various pH values. The results showed that thle rate of particle flocculation increased with tile addition of the buffer. With a particle concentration of 100 mg/l and pH of 6.0, tile floc size decreased with the increasing shear. While with a pH of 7.5, the floc size increased with the shear until it reached a maximum value at the shear of 400 s−1 and then the size decreased as the shear increased further to 500 s−1. The maximum size slicar was found at 200 s−1 for pH 7.9. By increasing tile pH value to 9.0, there was no particle growth with any applied shear. The electroplioretic mobility of the particles was measured. It was found that for any constant shear the floc size is inversely proportional to the absolute value of the mobility. That is, the more repulsive the force between particles, the smaller the floc size. The effect of pH on floc size was not uniform within the pH range tested. The results demonstrated that the higher the shear the more significant the changes of floc size due to the pH effect.
關聯: 99(1-4), pp.55-62
URI: http://ntour.ntou.edu.tw/handle/987654321/25421
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