The effect of temperature on the seepage transport of suspended particles in a porous medium

Abstract

The main purpose of this study is to experimentally investigate the effect of temperature on the seepage transport of suspended particles (SP) with a median diameter of 10–47 μm in a porous medium for various seepage velocities. The results show that the rise of temperature accelerates the irregular movements of SPs in the porous medium and reduces their migration velocity. As a result, the pore volume corresponding to the peak value of the breakthrough curves is apparently delayed, and the peak value in the effluent is decreased. The migration velocity of SPs decreases with increasing particle size, regardless of the Darcy velocity and temperature. The longitudinal dispersivity of SPs decreases slightly with increasing temperature and then remains almost unchanged. Larger particles experience more irregular movements induced by the limit of pore size, which leads to a larger dispersivity. The deposition coefficient increases with increasing temperature, especially in the case of a high seepage velocity, and then tends to be stable. The deposition coefficient for large‐sized particles is higher than that for small‐sized particles, which can be attributed to the restriction of large‐sized particles by the narrow pores in the porous medium. The recovery rate decreases slightly with the increase of temperature until a critical value is reached, beyond which it remains almost unchanged. In summary, temperature is a significant factor affecting the transport and deposition of SPs in the porous medium, and the transport parameters such as particle velocity, dispersivity, and deposition coefficient.

Clogging process by suspended solids during groundwater artificial recharge: Evidence from lab simulations and numerical modelling

“…The physical clogging mechanism is then mainly controlled by the movement (advection and dispersion), attachment (filtration, retention, colmatage, and deposition), and detachment (resuspension and reentrainment) of the inert suspended particles (Ahfir et al, ; Moghadasi, Müller‐Steinhagen, Jamialahmadi, & Sharif , ; Skolasińska, ). Particle movement can be motivated or restricted by various factors, such as temperature, water infiltration rate, suspension viscosity and concentration, and particle–particle and particle–porous medium interactions, and is related to their own shape and size (Bai, Long, Rao, & Xu, ; Bradford, Yates, Bettahar, & Simunek, ; Cui, Fan, Wang, & Huang, ; Mays & Hunt, ; Rehg, Packman, & Ren, ; Torkzaban, Bradford, & Walker, ; Wang et al, ). However, these investigations mainly focused on relating the above environmental factors to the final infiltration abilities of columns, and the spatial‐temporal evolution of suspended solid (SS) clogging was still not well understood.…”

The seepage transport of heavy metal Pb2+ through sand column in the presence of silicon powders

“…, where C out and V p are the particle concentration at the outlet and the pore volume of the entire soil column, respectively (Ahfir et al, 2009;Bai et al, 2017).…”

“…The particle concentration can be obtained from Eqs. (1) and(2) by the Laplace transform and the Laplace transform inversion (Bai et al, 2017)…”

“…Here, the concept of dimensionless pore volume (PV) is introduced to describe the time process, which refers to the ratio of the total volume of water flowing through the sand column to the pore volume of the sand column. The dispersivity is defined as α d = D/u 0 , where u 0 is the average interstitial fluid velocity (u 0 = v/n) (Bai et al, 2017). The recovery rate is defined by integrating simulated BTCs area:…”

“…Despite the recognized importance of the coupled transport of contaminants with solid particles like colloids due to their abundance in groundwater and particular physical properties such as large specific surface area and high adsorption capacity (Bai et al, 2017;Bekhit et al, 2009), surprisingly little is known about the coupled transport of contaminants with relatively larger solid particles with a median diameter of >1 μm.…”