Experimental study of mass transfer by volatilization inside a portable wind tunnel used to estimate emission rates for odorous compounds

Philipe Uhlig Siqueira; Laize Nalli de Freitas; Matheus de Araújo Siqueira; Pâmela Rossoni Lima; Jane Meri Santos; Bruno Furieri

doi:10.5327/Z2176-94781612

Autores

Philipe Uhlig Siqueira Pontifícia Universidade Católica do Rio de Janeiro (PUCRJ) - Brasil https://orcid.org/0000-0001-6057-6966
Laize Nalli de Freitas Universidade Federal do Espírito Santo (UFES) - Brasil https://orcid.org/0000-0001-8737-2875
Matheus de Araújo Siqueira Universidade Federal do Espírito Santo (UFES) - Brasil https://orcid.org/0009-0000-6426-3203
Pâmela Rossoni Lima Universidade Federal do Espírito Santo (UFES) - Brasil https://orcid.org/0000-0002-4538-9297
Jane Meri Santos Universidade Federal do Espírito Santo (UFES) - Brasil https://orcid.org/0000-0003-3933-2849
Bruno Furieri Universidade Federal do Espírito Santo (UFES) - Brasil https://orcid.org/0000-0002-9736-0250

DOI:

https://doi.org/10.5327/Z2176-94781612

Palavras-chave:

sulfeto de hidrogênio; volatilização; túnel de vento portátil; odor; coeficiente de transferência de massa.

Resumo

Estações de tratamento de esgoto são fontes de sulfeto de hidrogênio em ambientes urbanos. Este composto, em determinadas concentrações, pode estar associado ao comprometimento da saúde e bem-estar das populações que residem próximas a tais fontes, caracterizadas por sua emissão difusa, o que dificulta sua quantificação. O túnel de vento portátil é um dos dispositivos aplicados na mensuração deste tipo de emissão, porém, este equipamento não é capaz de simular todos os fenômenos significativos para o transporte de massa. Desta forma, este estudo investigou a transferência de massa na interface líquido-gás do sulfeto de hidrogênio, estimando o coeficiente global de transferência de massa no interior do túnel de vento portátil. A vazão de entrada no sistema variou entre 600 e 1,800 L min^-1 e a análise do decaimento da concentração na fase líquida foi realizada por espectrofotometria. O decaimento exponencial observado é condizente com as hipóteses adotadas, entretanto, nenhuma variação significativa no coeficiente de transferência de massa foi observada para diferentes vazões de operação do sistema. O valor médio encontrado foi de 2,70×10-5^±2,99×10-6 m s^-1. Em resumo, o presente estudo contribuiu para a compreensão da transferência de massa do sulfeto de hidrogênio em ambientes de tratamento de efluentes, utilizando um túnel de vento portátil como ferramenta experimental.

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