Risk Evaluation and Repair of the Sites Polluted by Nitrobenzene Chemical Plant

Abstract

In order to study the potential soil pollution risk of polluted sites with changed purposes in intensive industrial and commercial areas, this paper has determined the distribution points sampling and monitoring scheme for the polluted sites by analyzing the production history and future planning of a nitrobenzene chemical plant. The concentrations of benzene, toluene, chlorobenzene and nitrobenzene in different depths and locations are tested for single-factor analysis, according to which a risk evaluation is conducted and a current soil repair method is discussed. According to the result, various organic pollutants especially benzene have polluted the soil, which is more severe in the upper soil. The pollution degree decreases with depth and only the deepest soil is not polluted. Therefore, the soil repair technology is to be determined comprehensively according to the pollution condition with environmental, technical and economic evaluations.