Uso da ozonização para tratamento de chorume e avaliação da ecotoxicidade

Abstract

The generation of urban solid waste is an inevitable process and with each passing year, this type of waste has increased and become one of the major problematic issues faced by society. This type of waste is generally disposed of in landfills and if it is not disposed of in a place with suitable conditions, it can contaminate the soil and reach the water table. Therefore, the objective of the present study aims to apply the ozone treatment technique with the aim of reducing the physical-chemical parameters of the leachate generated by the landfill installed in the municipality of Dois Vizinhos, Paraná. For the treatment, the ozonization technique was applied on a laboratory scale, using a discontinuous photocatalytic reactor, which was continuously fed with O2 and O3 gases. The physicochemical analyzes showed a reduction in all analyzed parameters, with the exception of pH, which remained the same. Despite this, the treated effluent, as well as the raw effluent, proved to be toxic to the Eisenia fetida bioindicator (leakage test). The behavior was different for Artemia salina L. (immobility/mortality test), since the treated effluent showed no signs of toxicity, while the raw effluent only showed a concentration of 100%. The results confirm that the leachate has toxic potential to bioindicators, and consequently, to the environment. Therefore, the importance of continuing to investigate new treatment proposals is reinforced, as a way of further improving the reduction of physicochemical parameters and final toxicity.