Dessulfurização de biogás por processo fotossintético com microalgas e absorção por lavagem com água
DOI:
https://doi.org/10.33448/rsd-v11i10.32891Palavras-chave:
Biogás; Dessulfurização; Microalgas; Purificador.Resumo
O biogás apresenta alto potencial para ser usado na geração de eletricidade e de calor e em substituição ao combustível veicular, favorecendo a diminuição da dependência por combustíveis fósseis. Para que o biogás possa ser utilizado com segurança e eficácia, o H2S precisa ser removido a níveis toleráveis para o fim a que se destina. O objetivo deste trabalho foi avaliar o potencial de um purificador em escala piloto para promover a dessulfurização do biogás, usando o processo fotossintético com microalgas e o processo de absorção por lavagem com água à pressão atmosférica. Os resultados das análises de cromatografia gasosa do biogás bruto mostraram concentrações de H2S acima de 1.000 ppm. Para o sistema fotossintético com microalgas, o teor de H2S no biogás purificado foi reduzido para 11 ppm com 30 minutos de operação e aos 180 minutos houve a remoção completa, permanecendo assim até o final do ciclo diário de funcionamento. Para o sistema de lavagem com água, apesar do gás sulfídrico no biogás purificado ter diminuído consideravelmente no intervalo estudado, percebeu-se o aumento do teor ao longo do tempo, com as leituras variando de 37,8 ppm a 188,4 ppm, indicando a possibilidade de ocorrência de saturação total deste componente, caso o sistema trabalhe ininterruptamente. Assim, a remoção do gás sulfídrico por meio do processo biológico com microalgas foi realizada com sucesso em purificador em escala piloto, sendo seu desempenho classificado como promissor, fornecendo condições apropriadas para dessulfurização do biogás.
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