Tratamento de lixiviado de aterro sanitário utilizando coagulação/floculação, cavitação associada a ozonização e polimento com carvão ativado
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Data
2022-03-18
Autores
Domingos, Janaina de Melo Franco
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A utilização de processos oxidativos avançados em tratamento de lixiviados de aterro sanitário vem recebendo grande destaque, principalmente quando utilizados associados à coagulação e floculação. O presente trabalho teve como objetivo construir um protótipo e avaliar os processos de coagulação/floculação associados ao processos oxidativos e polimento com carvão ativado na tratabilidade do lixiviado estabilizado em Campinas-SP. O tratamento denominado completo foi a combinação de coagulação e floculação, cavitação hidrodinâmica e ozonização e polimento com carvão ativado (CM/O1/O2/CA). Foi avaliada a variação do pH para os quatro coagulantes (FeCI3, AlCl3, PGα21Ca e Al2(SO4)3) fixando a dosagem em 1g L-1 em ensaio de Jar test, avaliação da tratabilidade do lixiviado in natura e teste de 1-6 h por cavitação hidrodinâmica e ozonização e a partir dos resultados, realizou o tratamento em um reator em inox (5 L) e geração máxima de O3 1,83gO3 h -1 . Os melhores resultados para o Jar test possibilitou a escolha do pH ótimo para cada coagulante utilizado: FeCI3 em pH 5, AlCl3 em pH 5, PGα21Ca em pH 4 e Al2(SO4)3 em pH 5. A tratabilidade do lixiviado em reator no tempo de 1-6 h auxiliaram na tomada de decisão para o tratamento em 2 h devido a próximidade nas reduções de DQO entre 30,8% (2 h) e 36,7% (3 h). Para o tratamento denominado completo utilizando os quatro coagulantes individualmente e finalizando com polimento em carvão ativado pode-se concluir que para a remoção de DQO o PGα21Ca com 87,4%; AlCl3 com 85,8%; Al2(SO4)3 com 83,3% e FeCI3 com 81,7%. De forma geral, todos os coagulantes apresentaram reduções expressivas também nos valores dos parâmetros cor e turbidez. Os resultados obtidos foram inovadores e podem auxiliar em projetos de sistemas de tratamento de lixiviado de aterros sanitários, bem como em efluentes de origem urbana e/ou industrial.
The use of advanced oxidative processes in the treatment of landfill leachate has been receiving great attention, especially when used in association with coagulation and flocculation. The present work aimed to build a prototype and evaluate the coagulation/flocculation processes associated with oxidative processes and activated carbon polishing in the treatability of stabilized leachate in Campinas-SP. The so-called complete treatment was the combination of coagulation and flocculation, hydrodynamic cavitation and ozonation and polishing with activated carbon (CM/O1/O2/CA). The pH variation for the four coagulants (FeCI3, AlCl3, PGα21Ca and Al2(SO4)3) was evaluated, fixing the dosage at 1g L-1 in a Jar test, evaluating the treatability of the leachate in natura and a test of 1-6 h by hydrodynamic cavitation and ozonation and from the results, the treatment was carried out in a stainless steel reactor (5 L) and maximum O3 generation 1.83gO3 h-1 . The best results for the Jar test made it possible to choose the optimal pH for each coagulant used: FeCl3 at pH 5, AlCl3 at pH 5, PGα21Ca at pH 4 and Al2(SO4)3 at pH 5. The treatability of the leachate in a reactor over time of 1-6 h helped in decision making for treatment at 2 h due to the proximity in COD reductions of between 30.8% (2 h) and 36.7% (3 h). For the so-called complete treatment using the four coagulants individually and finishing with activated charcoal polishing, it can be concluded that for the COD removal, PGα21Ca with 87.4%; AlCl3 with 85.8%; Al2(SO4)3 with 83.3% and FeCl3 with 81.7%. In general, all coagulants also showed significant reductions in the values of color and turbidity parameters. The results obtained were innovative and can help in projects of leachate treatment systems from sanitary landfills, as well as effluents of urban and/or industrial origin.
The use of advanced oxidative processes in the treatment of landfill leachate has been receiving great attention, especially when used in association with coagulation and flocculation. The present work aimed to build a prototype and evaluate the coagulation/flocculation processes associated with oxidative processes and activated carbon polishing in the treatability of stabilized leachate in Campinas-SP. The so-called complete treatment was the combination of coagulation and flocculation, hydrodynamic cavitation and ozonation and polishing with activated carbon (CM/O1/O2/CA). The pH variation for the four coagulants (FeCI3, AlCl3, PGα21Ca and Al2(SO4)3) was evaluated, fixing the dosage at 1g L-1 in a Jar test, evaluating the treatability of the leachate in natura and a test of 1-6 h by hydrodynamic cavitation and ozonation and from the results, the treatment was carried out in a stainless steel reactor (5 L) and maximum O3 generation 1.83gO3 h-1 . The best results for the Jar test made it possible to choose the optimal pH for each coagulant used: FeCl3 at pH 5, AlCl3 at pH 5, PGα21Ca at pH 4 and Al2(SO4)3 at pH 5. The treatability of the leachate in a reactor over time of 1-6 h helped in decision making for treatment at 2 h due to the proximity in COD reductions of between 30.8% (2 h) and 36.7% (3 h). For the so-called complete treatment using the four coagulants individually and finishing with activated charcoal polishing, it can be concluded that for the COD removal, PGα21Ca with 87.4%; AlCl3 with 85.8%; Al2(SO4)3 with 83.3% and FeCl3 with 81.7%. In general, all coagulants also showed significant reductions in the values of color and turbidity parameters. The results obtained were innovative and can help in projects of leachate treatment systems from sanitary landfills, as well as effluents of urban and/or industrial origin.
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Palavras-chave
Solos lixiviação, Aterro sanitário, Processos oxidativos avançados, Floculação, Cavitação, Hidrodinâmica, Leaching soils, Landfill, Advanced oxidative processes, Flocculation, Cavitation, Hydrodynamics