An eco-friendly and low-cost strategy for groundwater defluorination: adsorption of fluoride onto calcinated sludge

The excess of fluoride ions (F−) in water for human supply is a serious public health. The recommended concentration of F− ions by the World Health Organization (WHO) is 1.5 mg L-1. Several groundwater sources around the world contain high F− concentrations, and require treatment before human consumption. It was developed an eco-friendly and low-cost strategy for groundwater defluorination, i.e., adsorption onto calcinated sludge. This strategy was efficient at pH of 5.5 and using 5 g L-1 of calcinated sludge. The groundwater attained the WHO standard within 60 min. The kinetic model of pseudo-second-order obtained a better adjustment to the experimental data. The equilibrium curve at 25 °C was better represented by the Tóth model. The maximum adsorption capacity was 2.04 mg g-1. Therefore, adsorption using calcinated sludge can be considered as an eco-friendly and low-cost strategy for groundwater defluorination.

• Autores: Pigatto, Renata; Franco, Dison; Schadeck Netto, Matias; Carissimi, Élvis; Silva Oliveira, Luis Felipe; Jahn, Sérgio Luiz; Dotto, Guilherme Luiz
• Tipo de recurso: Article of journal
• Fecha de publicación: 2020
• Institución: Corporación Universidad de la Costa
• Repositorio: REDICUC - Repositorio CUC
• Idioma: eng
• OAI Identifier: oai:repositorio.cuc.edu.co:11323/7139
• Acceso en línea: https://hdl.handle.net/11323/7139; https://doi.org/10.1016/j.jece.2020.104546; https://repositorio.cuc.edu.co/
• Palabra clave: Adsorption; Defluorination; Water treatment; World Health Organization
• Rights: openAccess
• License: CC0 1.0 Universal