Evaluation of effluent post-treatment by slow filtration and adsorption with activated carbon produced from spent coffee grounds in surfactant removal in sewage treatment
Revista Ambiente E Água
Evaluation of effluent post-treatment by slow filtration and adsorption with activated carbon produced from spent coffee grounds in surfactant removal in sewage treatment
Autor Correspondente: Marcelo Pinheiro Ribeiro | [email protected]
Palavras-chave: activated carbono; coffee poder; effluent; surfactants
Resumos Cadastrados
Resumo Português:
Poluição ambiental é uma preocupação mundial, especialmente causada por despejos de esgotos nos coleção hídrica. Diversas substâncias compõem os despejos e resíduos industriais e esgotos domésticos. Os surfactantes destacam-se por serem amplamente usados tanto industrialmente como domesticamente. O consumo de detergentes e diversos tipos de tensoativos foi incrementado durante o período de pandemia da Covid-19, fato observado nos teores de surfactantes no efluente das Estações de Tratamento de Esgoto (ETE) - Vila City entre 21 e 39 mg L-1 neste período de tempo. Este trabalho avaliou as concentrações de surfactantes em diferentes etapas da ETE da Vila City, na cidade de Paranavaí, PR.- Brasil. Além disso, propôs-se a utilização de um pós-tratamento por filtração/adsorção por carvão ativado produzido a partir da borra de café na remoção complementar dos surfactantes. Foram confeccionadas colunas de adsorção com meio filtrante de areia e carvão em escala piloto e realizados ensaios de filtração/adsorção simulando filtração lenta com taxas de aproximadamente 15 m3 m-2 dia-1. Os parâmetros utilizados na avaliação da eficiência nos ensaios em escala piloto foram: turbidez e surfactantes. Obteve-se como resultado, as remoções das concentrações de surfactantes de cerca de 9% e 7% no reator anaeróbio de leito fluidizado (RALF) e no tratamento secundário na ETE, respectivamente. No pós-tratamento proposto em ensaios de filtração/adsorção em escala piloto obteve-se uma redução de aproximadamente 94% de turbidez (uT) e de 95% de surfactantes, respectivamente.
Palavras-chave: carvão ativado de borra de café; efluente; surfactante
Resumo Inglês:
Environmental pollution is a worldwide concern, especially when caused by sewage dumping into water bodies. Many substances are present in industrial or domestic wastewater, causing contamination in superficial water collection. Surfactants stand out for being widely used both industrially and domestically. The use of detergents and many types of surfactants was increased during the Covid-19 pandemic period, a fact observed in the levels in the effluent sample analysis from a Sewage Treatment Plant (STP) - Vila City around 21 and 39 mg L-1 in this period. This work evaluated the surfactant concentrations in the primary and secondary treatment units of the Vila City STP, in the city of Paranavaí-PR.-Brazil. In addition, the use of a post-treatment by slow sand filtration and adsorption by activated carbon produced from spent coffee grounds in the complementary removal of surfactants was proposed. A mixed bed with sand and activated carbon columns was made on a pilot scale, and filtration/adsorption runs were performed simulating slow filtration with rates of approximately 15 m3 m-2 day-1. The parameters used for the efficiency removal evaluation in a pilot plant run were: turbidity (NTU) and surfactant concentrations. The removal of surfactant concentrations was about 9% and 7% in the Upflow Anaerobic Sludge Bed reactors (UASB-RALF) and in the secondary treatment, respectively, at the STP - Vila City units. In the post-treatment proposed by filtration/adsorption, bed columns on a pilot scale plant obtained a reduction of approximately 94% in terms of turbidity (NTU) and 95% in terms of surfactant removal.
Keywords: activated carbono; coffee poder; effluent; surfactants
Resumo Espanhol:
Environmental pollution is a worldwide concern, especially when caused by sewage dumping into water bodies. Many substances are present in industrial or domestic wastewater, causing contamination in superficial water collection. Surfactants stand out for being widely used both industrially and domestically. The use of detergents and many types of surfactants was increased during the Covid-19 pandemic period, a fact observed in the levels in the effluent sample analysis from a Sewage Treatment Plant (STP) - Vila City around 21 and 39 mg L-1 in this period. This work evaluated the surfactant concentrations in the primary and secondary treatment units of the Vila City STP, in the city of Paranavaí-PR.-Brazil. In addition, the use of a post-treatment by slow sand filtration and adsorption by activated carbon produced from spent coffee grounds in the complementary removal of surfactants was proposed. A mixed bed with sand and activated carbon columns was made on a pilot scale, and filtration/adsorption runs were performed simulating slow filtration with rates of approximately 15 m3 m-2 day-1. The parameters used for the efficiency removal evaluation in a pilot plant run were: turbidity (NTU) and surfactant concentrations. The removal of surfactant concentrations was about 9% and 7% in the Upflow Anaerobic Sludge Bed reactors (UASB-RALF) and in the secondary treatment, respectively, at the STP - Vila City units. In the post-treatment proposed by filtration/adsorption, bed columns on a pilot scale plant obtained a reduction of approximately 94% in terms of turbidity (NTU) and 95% in terms of surfactant removal.
Keywords: activated carbono; coffee poder; effluent; surfactants
