Mathematical Modeling and Sensitivity Analysis on Cadmium Transport in Kaolinite under Direct Current Electric Field

Abstract

Soil pollution is a challenging concern for environmentalists. Different remediation methods have been proposed to remediate polluted soils. Most of the existing methods cannot purify low permeable soils. Electrokinetic remediation (EKR) is an effective method which can remediate fine-grained soils. Understanding the physicochemical phenomena of the EKR is necessary to achieve efficient experimental framework. Therefore, the present study aims to introduce a theoretical and mathematical model for the EKR process. In the present model, different transport phenomena including ion migration, electroosmotic flow, and diffusion were considered. In addition, Chemical reactions such as adsorption/desorption, precipitation/dissolution, water autoionization reaction, and electrolysis reaction were considered. For modeling purpose, a set of partial differential and algebraic equations were used to model the remediation process. The implicit finite difference numerical model showed a good capability of simulating the EKR process. The sensitivity analysis on the retardation and tortuosity factors represented that the retardation factor had a considerable effect on the pH and cadmium concentration profiles. Although tortuosity factor did not have a significant impact on the pH profile, it had a non-negligible effect on the cadmium concentration profile.

Bioaugmentation of Vibrio alginolyticus in phytoremediation of aluminium-contaminated soil using Scirpus grossus and Thypa angustifolia

“…The pollution of soil requires human intervention with the existing technology to overcome pollution ( Imron et al., 2020 ; Menon et al., 2019 ). Efforts were initiated to process Al-contaminated soils by using several methods, namely, precipitation ( Kurniawan et al., 2018 ), evaporation, ion exchange and electrolysis ( Manikandan et al., 2020 ; Rezaee et al., 2017b , 2017a ). However, some of the above-mentioned technologies have caused further issues from the chemical residue and the used energy.…”

Correlation Biological Activity and Physicochemical Properties of Humic Acids in Aqueous Solutions

“…The relevance of the work associated with modifications of water purification systems comes from surface-active substances, including HA [44]. Different properties of HAs should also be taken into account in studies of decolorization of azo dye [45], soil cleaning and water purification with electrophysical [46] and electrochemical [47] methods, and water purification with different adsorbents [48].…”