Tratamento de água subterrânea contaminada com compostos organoclorados usando ferro elementar e o reagente de Fenton

Abstract

Recebido em 1/9/06; aceito em 15/2/07; publicado na web em 30/7/07 TREATMENT OF GROUNDWATER CONTAMINATED WITH CHLORINATED COMPOUNDS USING ELEMENTAL IRON AND FENTON'S REAGENT. The remediation of groundwater containing organochlorine compounds was evaluated using a reductive system with zero-valent iron, and the reductive process coupled with Fenton's reagent. The concentration of the individual target compounds reached up to 400 mg L-1 in the sample. Marked reductions in the chlorinated compounds were observed in the reductive process. The degradation followed pseudo-first-order kinetics in terms of the contaminant and was dependent on the sample contact time with the solid reducing agent. An oxidative test with Fenton's reagent, followed by the reductive assay, showed that tetrachloroethylene was further reduced up to three times the initial concentration. The destruction of chloroform, however, demands an additional treatment.