Abstract
Soil contamination is one of the major sustainable development issues which requires increasing efforts from multidisciplinary collaborations. In recent years, supercritical fluid remediation has been proposed as one “green technology” that is suitable with various types of contaminants without destroying the soil nature. Supercritical fluid process employs the high solubility and zero surface tension of supercritical states as well as the large solubility variations in the supercritical region for high efficiency separation. In this analysis, characteristics of soil contaminants in representative “matrix” conditions and related effects on remediation process with supercritical fluid technology are analyzed. Mechanisms and procedures of supercritical remediation technology are summarized and compared for different contaminants. Operation conditions, flow design, processing time and the entrainer applications in supercritical fluid remediation systems are shown to act more as coupled parameter groups rather than single-parameter controlled system. From a summary of existing remediation prototypes, a remediation efficiency around 80 % were shown. It is recommended that large-scale remediation trials be operated and optimized soon.
Published Version
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