Impacto da extração do óleo na atividade coagulante das sementes de moringa oleifera no tratamento de água produzida

• Autor(a) principal: Menezes, Nadja Nayara Fonseca de
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38709
• topic: água produzida; moringa oleifera; flotação; coagulante; tog; produced water; flotation; coagulant; Engenharias.

Water produced is the most common and the largest by-product of the oil industry and its non-treatment leads to possible operational and environmental damage. It is an effluent of complex composition, containing, among other pollutants, heavy metals, sulfides and emulsion oil. The most common and effective treatment is by Dissolved Air Flotation (DAF), which has a preliminary stage, called flocculation, where is used a polyelectrolyte (or flocculant). The polyelectrolyte ensures optimum flocculation through the neutralization of the particles’ charges, present on the effluent, making possible the agglutination of these particles and their consequent extraction. A natural polyelectrolyte alternative is obtained through the seeds of Moringa oleifera, which causes less environmental and human health impacts. Moringa is a multifunctional plant, with varied applicability studies of all its parts. The oil extracted from its seeds, for example, has been studied as an alternative source for the production of biodiesel. This study, therefore, evaluated the impact of oil extraction on the coagulant activity of moringa seeds, as well as the efficiency of the removal of total oil and grease content (TOG) when using a natural flocculant like moringa seeds with oil (MCO) and without oil (MSO). The physical-chemical characterization of both seeds demonstrated that the oil extraction represents a considerable impact on its properties, such as isoelectric point (PI), pH, chemical composition and cationic protein concentration. The PI for the MCO was 4.8, while for the MSO it was 9.8. In the treatment trials of water produced by DAF, the MCO flocculant presented a higher concentration of the coagulant protein at pH 9.5, with a yield of 75.15 ± 1.04% in the removal of TOG. For MSO, this pH was 11, yield 56.36 ± 2.57%. The maximum efficiency obtained when using MCO was 78.25 ± 2.23%, at pH 4.8. With MSO, 77.58 ± 2.78% of TOG removal was achieved at a pH of 5.2.