EFFECTS ON PYRENE REMOVAL FROM CONTAMINATED SOIL USING FENTON REAGENTS AND DEGRADATION PRODUCT ANALYSIS BY FTIR

Polycyclic aromatic hydrocarbons (PAHs) are mutagenic, teratogenic and carcinogenic so that the appropriate remediation technology for the removal of PAHs is urgently required. The chemical oxidation processes have proved that various hazardous substances can be effectively removed by Fenton reagents (ferrous ions and hydrogen peroxide). Therefore, this study was aimed to remediate pyrene from soil by Fenton reagents and to identify the products using FTIR. The results reveal that Fenton reactions occur rapidly react with pyrene in a batch system, and the best removal efficiency was about 80% for 100 mg/kg of initial pyrene concentration in soil with 412mM of H(2)O(2) and 21.6mM Fe(II) (molar ratio H(2)O(2)/Fe(II): 19.07). Furthermore, the concentrations of hydrogen peroxide and ferrous solutions simultaneous affected the pyrene removal. Thus, the optimal concentrations of two reagents depended on the requirement of removal efficiencies, time, cost and the residual H(2)O(2) concentrations. In addition, pH and ORP data were monitored during the reactions which showed the oxidation status and the final of about pH 3. In addition, the higher pyrene initial concentrations obviously declined pyrene removal. The degradation product analysis by FTIR indicated the cleavage of benzene rings to smaller structure with less or no toxic. Thus, soil remediation with pyrene by Fenton reaction was successfully demonstrated in this study.