Abstract
The effectiveness of ozonation as a method for the in situ remediation of non-aqueous phase liquid (NAPL)-polluted soils is examined. Soils were polluted artificially with a model NAPL consisting of equal mass fractions of n-decane, n-dodecane and n-hexadecane at two concentrations 1g/kg-soil, and 10g/kg-soil. The polluted soils were placed inside a stainless steel column and treated with the injection of ozone-rich gas, produced from oxygen by a corona discharge ozone generator, controlled by a gas mass flow controller, and monitored by an ozone analyzer. Soil samples collected from the soil column were used after pre-treatment to measure the concentrations of the total organic carbon (TOC), and total petroleum hydrocarbons (TPH) as function of time. The concentrations of carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxides (NOx), and volatile organic compounds (VOCs) were detected on-line by a multi-sensor and portable gas analyzer. .
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