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Effects of Ionic Surfactants on the Settling Velocity of Fine Cohesive Sediments in Yangtze River

Author(s): Yuexiao Liu

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Keywords: Cohesive sediment; Las; CTAB; Settling velocity;

Abstract: Representing as the anionic and cationic surfactant respectively, Linear Alkylbenzene Sulfonate (LAS) and Cetyltrimethyl Ammonium Bromide(CTAB)is extensively employed in the formulation of laundry and cleaning products. Due to its properties, it could aggregated to the interface of solid-liquid and have a tendency to absorb on sediments with a result of altering its physicochemical characteristics. Undoubtedly, it have some effects on the behavior of sediment dynamics once discharged into water column. However, there are no research studied on the influence of ionic surfactants on the settling velocity of natural sediment particles in available literature. This study examined the effect of surfactants on the settling velocity of sediments via the McLaughlin method. Several parameters including settling velocity, zeta potential and surface tension were measured to determine their influences. The results showed that anionic surfactants have little effect on the sedimentation rate of fine sediment. Additionally, Cationic surfactants accelerate the flocculation of fine sediment by changing the surface potential of natural particles.


Year: 2019

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