Aplicação de processos oxidativos avançados do tipo fenton para remediação de solo contaminado com atrazina

Abstract

Atrazine is a herbicide widely used in Brazil for the control of weeds, characterized as moderately toxic and of difficult degradation, being frequently associated with environmental pollution. Its high mobility in the soil and its potential for contamination of surface and groundwater can pose a serious risk to human health due to its potential mutagenic and carcinogenic effects. The present work evaluated the potential of advanced oxidative processes(AOP)of the Fenton type for the degradation of atrazine in leached water from soil classified as distropheric Red Latosol. The experimental scheme followed a multivariate design of the complete and discontinuous factorial type to evaluate the effect of the height of the soil column and the type of Fenton process (conventional Fenton or Fe-glutamate). The application of advanced oxidative processeswas performed according to the in situ soil-flushing system in open Polyvinyl Chloridecolumns contaminated withatrazine, with the condition of best efficiency represented by the conventional Fenton treatment and height of soil column of 10 cm, was selected with the aid of analysis of variance (ANOVA) and response surface methodology (MSR). The levels and residual concentration of atrazine in the leachate quantified by high performance liquid chromatography were significantly reduced and the soil fertility attributes, including organic matter, were not significantly affected after treatment.