Journal
CHEMOSPHERE
Volume 313, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.137264
Keywords
Low-permeability sites; Migration characteristics; Contaminants; Remediation technologies
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Rational utilization and remediation of soil resources are necessary due to the increasing demand for clean soils. However, many in-situ remediation technologies are limited in low-permeability sites. This work summarizes the migration characteristics of contaminants at low-permeability sites and discusses various technologies suitable for remediation. It also emphasizes the importance of combining different technologies and proposes prospects for their application.
Rational utilization of soil resources and remediation of contaminated soils are imperative due to the rapidly growing demand for clean soils. Currently, many in-situ remediation technologies are less suitable at low -permeability sites due to the limitations of soil permeability. This work defines a low-permeability site as a site with hydraulic conductivity less than 10-4 cm/s, and summarizes the migration characteristics of repre-sentative contaminants at low-permeability sites, and discusses the principles and practical applications of different technologies suitable for the remediation of low-permeability sites, including electrokinetic remediation technology, polymer flushing technology, fracturing technology, and in-situ thermal remediation technology. Enhanced and combined remediation technologies are further described because one remediation technology cannot remediate all contaminants. The prospects for the application of remediation technologies to low -permeability sites are also proposed. This work highlights the necessity of low-permeability sites remediation and the urgent need for new remediation technologies, with the hope to inspire future research on low -permeability sites.
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