An analytical deterministic model for simultaneous phytoremediation of Ni and Cd from contaminated soils

Abstract

Soil contamination by heavy metals, due to human activities, is not often limited to a single contaminant. The objective of this study was to develop a simple model for phytoextracting separate and combined Ni and Cd from contaminated soils. The study was further aimed to study phytoextraction potential of ornamental kale and land cress grown in soils contaminated with separate and combined Ni and Cd metals. The results indicated that elevated Ni and Cd concentrations in soil inhibit growth of both ornamental kale and land cress plants. In Ni + Cd treatments, growth and development of both plants were more affected than in either Ni or Cd treatments. Further, in Ni + Cd treatments, Ni concentration in tissues of both plants was increased by increasing soil Ni concentration under various Cd concentrations. At constant Ni concentration, addition of Cd did not appreciably changed Ni content of plant tissues. Land cress demonstrated higher tolerance to soil contamination by Ni and Cd compared to ornamental kale. It also demonstrated higher phytoextraction potential for soil Cd than ornamental kale. Enhanced bioavailability of Ni and Cd ions, due to competitive adsorption and desorption reactions, had no reasonable effect on metal ion accumulation in plant tissues. This indicates that at relatively high soil contamination, metal ion adsorption is no longer a limiting factor for phytoremediation. The newly proposed model, which assumes that metal uptake rate inversely depends on total soil metal ion concentration, reasonably well predicted the cleanup time of Ni, Cd, and Ni at the presence of Cd from the contaminated soils. The model also predicts that phytoremediation process takes much longer time when soil is contaminated by multi-metal ions.

Distance-dependent varieties of microbial community structure and metabolic functions in the rhizosphere of Sedum alfredii Hance during phytoextraction of a cadmium-contaminated soil

“…Phytoextraction, the utilization of plants to uptake heavy metal from the soils, is regarded as a cost-effective and green way for the remediation of Cd-contaminated soil (Davari et al 2015;Muehe et al 2015). In the past few years, there has been a growing interest on studying the effectiveness of metal phytoextraction.…”

Optimizing landfill site selection by using land classification maps

“…A large number of studies have been conducted in the past several decades on how landfills may impact on the environment, such as through gas emission, olfactory nuisance, and global greenhouse effects (e.g., Molins et al 2008;Chanton et al 2009;Lou and Nair 2009;Bogner et al 2011), landfill leachate generation (Lee et al 2002;MacDonald et al 2008;Renou et al 2008;Santos et al 2013), pollution control and health risk assessment (Chrysikou et al 2008;Mari et al 2009), and landfill phytoremediation and bioremediation (Bennett et al 2003;Kim and Owens 2010;Justin et al 2010;Davari et al 2015). Other studies have focused on optimal siting of waste treatment facilities (Aragonés-Beltrán et al 2010;Tavares et al 2011) and on landfill site selection (Ekmekcioglu et al 2010;Gorsevski et al 2012;Eskandari et al 2013).…”

Green Remediation And Physiological Responses of Plants To Metal-Contaminated Soils In Jinchang Mining Areas, Western Desert, China

“…It has advantages of lower cost, less secondary pollution opportunity and less destroy space structure etc. It still can rise to rebuild vegetation, x landscape, and improve soil properties and soil ecological environment (Masoud, et al 2015). At present, there are a large number of economic and industrial production activities of metal mining in western China, which caused serious land pollution of metals, mainly due to lead, copper, zinc and cadmium (Yuan, et al 2020).…”