Remoção de fósforo do percolado de lodo sintético por precipitação de estruvita em reator de leito fluidificado

• Autor(a) principal: SILVA, Mislainy Mayana Moura Araújo
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/37165
• topic: Esgoto sintético. Reator de leito fluidificado. Condições operacionais. Formação de cristais de Estruvita.

The recovery and recycling of phosphorus from sewage is a measure of great importance, both to avoid pollution of water bodies and to reduce the need for mining of phosphorus deposits. Phosphorus removal from sanitary sewage can occur through biological, physico-chemical or both processes, with emphasis on activated sludge systems with biological phosphorus removal (RBF) and precipitation with metal salts or in the form of struvite. The latter offers advantages as the possibility of reuse of phosphorus as fertilizer or in other applications, although it is a delicate process, requiring the proper adjustment of several operating conditions such as pH, degree of mixing and the molar relationship between the constituents (Mg: P: N). The aim of this study was to evaluate the applicability in different operating conditions in a fluidized bed reactor with internal recirculation of seeds for precipitation of struvite from percolated sewage sludge. For this purpose, experiments were carried out in duplicate of the complete factorial type using synthetic sewage, keeping the pH and temperature parameters fixed, and varying the initial phosphorus concentration (50 and 100 mg/L), the aeration (Primary and secondary) and the molar ratio Mg: P: N (1:1:1 and 1.3:1:1). The reactor was efficient in the removal of phosphorus, and the best results were obtained for conditions that made use of the highest initial concentration of phosphorus (100 mg/L), obtaining a removal of 89.5%. The initial concentration of phosphorus and molar ratio were those that had the greatest influence on removal, while aeration was not a significant factor.