IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 6 - MARITIME HYDRAULICS AND COASTAL ENGINEERING : Experimental Research on Electrolytic Effects of Sediment Flocculation
Experimental Research on Electrolytic Effects of Sediment Flocculation
Author : Jingjing Zhou, Xiaoyang Song and Changkuan Zhang
Complex causes of formation and lots of influencing factors made flocculation is an important and difficult issue. For instance, electrolyte, organic matter, mineral components, hydrokinetic conditions can change flocculation results. Among them, electrolyte is a more primary and complicated one. Electrolyte does great influences on fine sediment flocculation. A series of experiments were designed and carried to measure the Zeta potential in four solutes, including natural seawater, artificial sea water, NaCl solution and MgC1 solution with different cation 2 concentration. According to the comparison of the speed of settlement of sediments, relationship between kinds and electric charges of cations and fine sediment flocculation was found. Meanwhile, further observations on flocs under the micro perspective through electronic scanning microscope were made to draw the final conclusion about the previous experiments. It was found that both kinds and electric charges of cations affect sediment?s Zeta potential. In theory, due to the compression of the electric double layer, Zeta potential will decrease with the increased electrolytic cations concentration. Nevertheless, in results? analysis, Zeta potential values of concentration curves appear multiplicative change tendency. The reasons are that fine sediment in the electrolyte solution exist the presence of charge reversal phenomenon, as well as the repulsive interaction when cationic ions and antiparticles encounter in the adsorption layer. In a word, it is the fact that the smaller Zeta potential, the more obvious flocculation phenomenon.
File Size : 1,378,825 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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