Abstract
The conventional methods used in the treatment of this residue lead to a discharge with intense coloration, high organic matter concentration, toxic metals and high toxicity. This work had as objective to study a system integrated for the remediation of the leachate originating from the sanitary landfill of Limeira-SP city The system consisted in a preliminary treatment by a system of slow sand filtration and the subsequent treatment through advanced oxidative processes, considering that the heterogeneous photocatalysis technique with TiO2/UV was experienced in remediation. The photocatalytic treatment was accomplished in a Pyrex glass reactor of approximately 1.7 L (100 mm of internal diameter, 145 mm of external diameter and total height of 300 mm). The experiments were carried out through water refrigeration and internal recirculation system of the leachate. To optimize the treatment process the best methodology it was evaluated to minimize the coloration of the leachate, one of the parameters of larger removal difficulty. The results were satisfactory with leachate coloration reduction in the order of: 66% in 180 min and 76% in 540 min of treatment with the heterogeneous fotocatálise, using 700 mg.L-1 of TiO2, 45°C temperature, 15 L.min-1 air flow and 400 Watts lamp.
Highlights
Os processos de tratamentos dos percolados de aterro foram iniciados a partir dos processos de tratamento de esgoto doméstico
Um estudo de “abertura” dos parâmetros vazão e temperatura, similar ao realizado com a concentração de Titânio - Degussa P25 (TiO2), também foi realizado para verificar a máxima eficiência de redução da cor
Similar aos resultados alcançados nos estudos de otimização com lâmpada de 250 Watts, ao utilizar uma lâmpada de 400 Watts à máxima redução da coloração foi encontrada utilizando a concentração de 700 mg.L-1 de dióxido de titânio, sendo observado uma melhor eficiência na redução da cor, em torno de 72,9% (Tabela 5)
Summary
Os processos de tratamentos dos percolados de aterro foram iniciados a partir dos processos de tratamento de esgoto doméstico. Com os resultados obtidos por meio do planejamento fatorial (Tabela 2), observou-se que as condições do teste 1 (concentração de TiO2 de 900 mg.L-1; vazão de ar 15 L.min-1 e temperatura de 40°C) apresentou maior eficiência na redução da cor do percolado (37,94%).
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