Removal of turbidity and color in domestic wastewater using aqueous seed extract of Cassia fistula
Revista Ambiente E Água
Removal of turbidity and color in domestic wastewater using aqueous seed extract of Cassia fistula
Autor Correspondente: Arnulfo Antonio Tarón Dunoyer | [email protected]
Palavras-chave: color; removal; turbidity; water treatment
Resumos Cadastrados
Resumo Português:
Muitas substâncias de origem vegetal são extraídas para serem utilizadas no tratamento primário de águas residuais domésticas. Na maioria dos casos, elas são usadas como agentes coagulantes e floculantes e são derivadas de sementes, folhas, cascas ou seiva, raízes e frutos de árvores e plantas. Nesta pesquisa, avaliou-se o uso da semente de Cassia fístula para a remoção de turbidez e cor em águas residuais domésticas de uma estação de bombeamento na cidade de Cartagena (Colômbia). A dose ideal de pó de semente de C. fístula foi determinada por teste de jarro usando um floculador digital E&Q F6-300. Parâmetros físico-químicos como turbidez e cor foram determinados, seguindo as recomendações da APHA (Métodos Padrão para Água e Esgoto), expressando os resultados em UNT (Unidade Nefelométrica Total) para turbidez e UPt-Co (Unidade de Platina-Cobalto) para a cor. Os resultados obtidos mostram que com uma dose de 160 mgL-1 do coagulante extraído da semente de C. fístula, atinge-se um valor de 34,14 NTU para remoção de 62,18% em relação ao valor de turbidez inicial. A cor diminui atingindo um valor mínimo de 88,59 UPC para remoção de 64%, na dose de 160 mgL-1 de coagulante natural. A semente de C. fistula exibiu boas propriedades de coagulação em baixas doses e pode ser uma alternativa importante para a remoção de cor e turbidez em águas residuárias.
Palavras-chave: cor; remoção; tratamento de água; turbidez
Resumo Inglês:
Many substances of plant origin are extracted for use in the primary treatment of domestic wastewater. In most cases, they are used as coagulating and flocculating agents and are derived from seeds, leaves, bark or sap, roots, and fruits of trees and plants. In this research, the use of Cassia fistula seed was evaluated for the removal of turbidity and color in domestic wastewater from a pumping station in the city of Cartagena (Colombia). The optimal dose of C. fistula seed powder was determined by jar test using an E&Q F6-300 digital flocculator. Physicochemical parameters such as turbidity and color were determined, following the recommendations of APHA (Standard Methods for Water and Wastewater), expressing the results in UNT (Total Nephelometric Units) for turbidity, and UPt-Co (Platinum-Cobalt Units) for the color. The results obtained show that with a dose of 160 mgL-1 of the coagulant extracted from the C. fistula seed, a value of 34.14 NTU is reached for removal of 62.18% with respect to the initial turbidity value. The color decreases reaching a minimum value of 88.59 UPC for removal of 64%, at a dose of 160 mgL-1 of natural coagulant. The seed C. fistula exhibited good coagulating properties at low doses and can be an important alternative for the removal of color and turbidity in wastewater.
Keywords: color; removal; turbidity; water treatment
Resumo Espanhol:
Many substances of plant origin are extracted for use in the primary treatment of domestic wastewater. In most cases, they are used as coagulating and flocculating agents and are derived from seeds, leaves, bark or sap, roots, and fruits of trees and plants. In this research, the use of Cassia fistula seed was evaluated for the removal of turbidity and color in domestic wastewater from a pumping station in the city of Cartagena (Colombia). The optimal dose of C. fistula seed powder was determined by jar test using an E&Q F6-300 digital flocculator. Physicochemical parameters such as turbidity and color were determined, following the recommendations of APHA (Standard Methods for Water and Wastewater), expressing the results in UNT (Total Nephelometric Units) for turbidity, and UPt-Co (Platinum-Cobalt Units) for the color. The results obtained show that with a dose of 160 mgL-1 of the coagulant extracted from the C. fistula seed, a value of 34.14 NTU is reached for removal of 62.18% with respect to the initial turbidity value. The color decreases reaching a minimum value of 88.59 UPC for removal of 64%, at a dose of 160 mgL-1 of natural coagulant. The seed C. fistula exhibited good coagulating properties at low doses and can be an important alternative for the removal of color and turbidity in wastewater.
Keywords: color; removal; turbidity; water treatment
