National Taiwan Ocean University Institutional Repository:Item 987654321/25421
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27287/39131
Visitors : 2446548      Online Users : 36
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item:

Title: Flocculation of particles by fluid shear in buffered suspensions
Authors: C.H.Tsai;I.Q.Hu
Contributors: NTOU:Department of Marine Environmental Informatics
Keywords: Flocs;median size;fine-sediments;pH;shear;size spreading;probability of cohesion;electrophoretic mobility
Date: 1997-10
Issue Date: 2011-10-20T08:23:10Z
Publisher: Water Air and Soil Pollution
Abstract: 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.
Relation: 99(1-4), pp.55-62
Appears in Collections:[Department of Marine Environmental Informatics] Periodical Articles

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback