Treatment technologies used for the removal of As, Cr, Cu, PCP and/or PCDD/F from contaminated soil: A review

Abstract

The contamination of soils by metals such as arsenic, chromium, copper and organic compounds such as pentachlorophenol (PCP) and dioxins and furans (PCDD/F) is a major problem in industrialized countries. Excavation followed by disposal in an appropriate landfilling is usually used site to manage these contaminated soils. Many researches have been conducted to develop physical, biological, thermal and chemical methods to allow the rehabilitation of contaminated sites. Thermal treatments including thermal desorption seemed to be the most appropriate methods, allowing the removal of more than 99.99% of organic contaminants but, they are ineffective for inorganic compounds. Biological treatments have been developed to remove inorganic and hydrophobic organic contaminants but their applications are limited to soils contaminated by easily biodegradable organic compounds. Among the physical technologies available, attrition is the most commonly used technique for the rehabilitation of soils contaminated by both organic and inorganic contaminants. Chemical processes using acids, bases, redox agents and surfactants seemed to be an interesting option to simultaneously extract organic and inorganic contaminants from soils. This paper will provide an overview of the recent developments in the field of decontamination technologies applicable for the removal of As, Cr, Cu, PCP and/or PCDD/F from contaminated soils.

Comparison of different interpolation methods and sequential Gaussian simulation to estimate volumes of soil contaminated by As, Cr, Cu, PCP and dioxins/furans

“…These results also showed that the contamination tends to decrease with depth (volume of contaminated soils less important in P2 compared with P1). These results can be explained by the fate and transport of metals, PCP and PCDD/F when they are released to the environment, due to the different physical and chemical properties of these contaminants and their different degree of affinity for the intrinsic components of soils (Guemiza et al, 2017). Besides, the results showed similarities in the estimations of the amounts of contaminated soils obtained by OK and SGS for PCP and PCDD/F unlike the other interpolation methods.…”

“…During the last decades, the amount of sites contaminated with inorganic and/or organic compounds dramatically increased. Therefore, challenges related to the rehabilitation of contaminated sites are becoming ubiquitous around the globe because of the serious health risks they represent as well as the significant costs involved (Guemiza et al, 2017). Treated wood storage sites are an example of areas of mixed contamination and are the subject of several studies.…”

Accumulation of Arsenic and Heavy Metals in Native and Cultivated Plant Species in a Lead Recycling Area in Vietnam

“…Therefore, the monitoring and remediation of As and heavy metal contamination in Vietnam are of great interest to many concerned agencies and organizations, but the efficiency of these processes is very limited. Various physical and chemical methods have been developed worldwide for environmental pollution monitoring and remediation with positive results [18][19][20]. However, the disadvantages of these methods are their high cost and the potential for secondary pollution.…”

Mechanistic Considerations on the Hydrodechlorination Process of Polychloroarenes

“…But as it was soon discovered, these procedures were in fact a source for a de novo polychlorinated compound synthesis, the process by which dioxins are re-formed being investigated in the recent years [17][18][19]. Therefore, greater attention was focused on more chemical-based processes [6,10,[20][21][22][23], along with microbial ones [24].…”