Synergistic Effects of Temporal Variations in Flow and Chemistry on Colloid Retention and Remobilization in Saturated Porous Media

Synergistic Effects of Temporal Variations in Flow and Chemistry on Colloid Retention and Remobilization in Saturated Porous Media

Yerramilli Sai Rama Krishna, N. Seetha, S. Majid Hassanizadeh

Column experiments were performed to study the effects of temporal variations in flow velocity alone and simultaneous temporal variations in flow velocity and ionic strength on retention and remobilization of colloids. Temporal increases in average water velocity caused an instantaneous spike release of colloids in the measured breakthrough curve, with the time to peak coinciding with the instant of velocity increase. During simultaneous temporal increases in flow and decreases in ionic strength, the release curve for every step-change in velocity and ionic strength was unimodal for deposition ionic strengths of 100 and 10 mM, with the peak coinciding with the instant of arrival of ionic strength front at the column outlet. However, the release curve was bimodal for deposition ionic strengths of 50 and 25 mM. Temporal variations in both flow and ionic strength released more colloids in the effluent than when only ionic-strength or only flow velocity was varied.

Journal of Hydrology, 132144
Corresponding Author: N Seetha

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