Evaluation of different ozone dosages in landfill leachate treatment
DOI:
https://doi.org/10.5902/2179460X85500Keywords:
Advanced oxidative processes, Ozonation, Real effluentAbstract
Landfill leachate treatment is challenging due to its heterogeneity and the presence of recalcitrant compounds in the effluent. Treatment processes with high removal efficiencies are required to meet the legal standards for effluent discharge into water bodies. This study aimed to characterize landfill leachate and evaluate the influence of different ozone dosages on the alteration of its physicochemical parameters. The leachate was collected from a landfill in the Candiota- RS municipality and characterized. The evaluated parameters included pH, true color, BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), BOD5/COD ratio, phosphorus, and total suspended solids, as well as the phytotoxicity of both raw and treated leachate. High removal values were observed for true color (75%), phosphorus (96%), and total suspended solids (90%) of the leachate when a dosage of 174.8 mg O3 L-1 was applied. These results demonstrate that satisfactory treatment of landfill leachate was achieved with low ozone concentrations. However, concerning organic matter and toxicity, it was found that the applied doses were insufficient to degrade all organic matter and reduce toxicity. Overall, ozone treatment is a promising alternative and can be applied as a pre-treatment for landfill leachate, with its biodegradability further enhanced through biological treatment, which is already common in landfills.
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