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ELECTROCHEMICAL TREATMENT OF PAH CONTAMINATED SEDIMENTS AND HUMAN HEALTH RISK ASSESSMENT

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Author(s): Irina Istrate | Adrian Badea | Diana Cocârţă | Cora Bulmău

Journal: Present Environment and Sustainable Development
ISSN 1843-5971

Volume: 5;
Issue: 1;
Start page: 101;
Date: 2011;
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Keywords: decontamination | risk assessment | B(a)P | sediments | electrochemical and chemical remediatio

ABSTRACT
According to the European Environmental Agency, soil contamination requiring clean up is about 250,000 sites in the European Economic Area (EEA) and this number is expected to grow. The main aim of this paper is to present an approach that was taking into account in order to identify the optimal solution for the remediation of contaminated soils and to assess human health risk from exposure to polluted soils. The technologies used in the experimental work are based on chemical and electrochemical oxidation. The considered exposure pathway for the assessment of the individual risk is soil ingestion. PAHs and B(a)P are the pollutants considered for the identification of new concentration levels after soil remediation and the influence of different decontamination technologies in relation with effects on the exposure through the soil exposure pathway. Based on the results of the experimental part of this study, chemical oxidation proves to be an effective remediation technology for the contamination of concern. Different oxidants and different reagent dosages showed different removal efficiencies. The best removal percentages were achieved with: modified Fenton’s reagent (100 mmols of H2O2 per 30 g - sample of sediments);hydrogen peroxide (25 mmols of H2O2 per 30 g - sample); potassium permanganate (50 mmols and 100 mmols of KMnO4 per 30 g - sample). The electro-oxidation showed to be able to achieve a very good PAH removal (above90%) after a four week treatment. The approach that will be illustrated in the following paper will demonstrate that the assessment of the human health effects must really become an important component of environmental assessment.
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