Experimental investigation of suspended particles transport in porous medium under variable temperatures

Abstract

This paper presents a study on suspended particle transport in porous medium with the aid of a sand layer transportation–deposition testing system to determine the kinetic characteristics of particles in porous medium under variable temperatures. Quartz sand and quartz powder were chosen as the porous medium and particle in the tests, respectively. Four size compositions and two operational modes, that is, temperature reduction mode (changing from 18°C to 5°C) and temperature increment mode (changing from 18°C to 35°C), were adopted. The turbidity and concentration of quartz powder were measured under various conditions. We observed a high temperature‐independent correlation between them. Breakthrough curves under different conditions were analysed using this testing system. The results showed that changes in temperature affected the particle transport process to some extent, and the degree of influence was closely related to the time moment of the temperature change onset. Moreover, we found a hysteresis phenomenon in the breakthrough curve under both temperature reduction and increment conditions. The results also indicated that the temperature effect was particularly significant for smaller particles. The typical curves to represent particle transport process under variable temperatures were put forward according to the results. To explain the test results, four factors, that is, water viscosity, adsorption effect, double layer force, and particle kinetic energy, were considered and categorized as promotion or constraining factors.

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.…”

Shear Characteristics of Gravel Soil With Different Fillers

“…These slopes are generally composed of white collapse deposits, residual deposits, landslide deposits, moraine deposits, and slope deposits. The solid component of these loose slopes is usually a mixture of soil and gravel, which is called the soil-rock mixture in China (Cui et al,2019;Medley, 1994). The soil-rock mixture is ubiquitous.…”

The Promotion/Inhibition of the Seepage Transport of Copper Ions by Suspension-Colloidal Particles with Wide Size Gradation

“…The transport processes, retardation mechanisms, and control measures of heavy metal pollutants in permeable soils remain an important topic [1,2] in the fields of environmental geotechnical engineering, ocean engineering, hydrology, engineering geology, municipal engineering, and even agricultural sciences [3], covering the seepage control of municipal solid waste landfills and industrial tailings ponds [4][5][6], treatment of contaminated groundwater [7][8][9], mining processes of metallic minerals [10,11], environmental damage caused by the use of pesticides and fertilizers [12], and treatment of municipal wastewater [13,14]. The movement of heavy metal pollutants and tiny suspended particles in soils is a complex process, in which the two either promote or inhibit each other.…”