Aplicação in-situ de persulfato de sódio para oxidação de BTEX em áreas contaminadas por hidrocarbonetos derivados do petróleo

Abstract

The worldwide increase in oil production and its derivatives also led to increase in areas contaminated by the same products. Through spills, leaks or accidents soil contamination occurs and groundwater by compounds with high toxic and carcinogenic indexes as BTEX (Benzene, Toluene, Ethylbenzene and Xylenes). This study aims to evaluate one of the techniques used by a company engaged in the remediation of contaminated areas. The technique is evaluated Chemical Oxidation In-Situ, that by sodium persulfate solution application in the contaminated area, promotes the degradation of BTEX via Advanced Oxidation Processes. Through groundwater sampling was identified a contaminated area of about 880m² with concentrations ranging between 14.62 and 20268.35 µg.L-1, a total weight of 218.22 kg of dopant is to be also oxidized .Considering the contents of organic matter and chemical demand of the soil was determined by a mass of 984.58 kg of sodium persulfate needed to achieve degradation of contaminants and remediate area. applying 6,600 L of 15% sodium persulfate solution, totaling 1,000 kg of oxidant. After new groundwater sampling in the area was observed an average reduction of 72.08% in contaminant concentrations in the area. From the results of the technique proved to be efficient in the degradation of BTEX in groundwater. However, it was not possible to achieve total degradation of contaminants. It is estimated that remediation method although effective by acting company must further characterize area parameters to best estimate the mass oxidants, thus avoiding the need for additional oxidant applications.