Examinando por Materia "Palm oil mill effluent"
Mostrando 1 - 2 de 2
Resultados por página
Opciones de clasificación
- PublicaciónAcceso abiertoEvaluation of native microorganisms for biodegradation of oil and grease in palm oil refinery effluents(2016) Agualimpia Valderrama, Bayron-Enrique; Otero-Muriel, José Vicente; Zafra, GermanThe use of novel mixed microbial consortia composed of native yeast and bacteria was evaluated for the treatment of palm oil mill effluents (POME) from an oil refining process. For this purpose, 31 native yeast and bacteria isolates demonstrating the ability to remove fats, oils and greases were evaluated, either as single organisms or mixed inocula, for the treatment of POMEs. Molecular and biochemical characterizations revealed that isolates corresponded to Candida, Bacillus and Pseudomonas genera. Seven mixed inocula, containing the 6 most degrading isolates, were established and tested for the removal of palm oil in liquid culture, achieving 68 to 84 % removal after 48 h. The inoculum constituted by all of the isolates produced the best results with an overall COD reduction from 1840 to 260 mg/L (84 %), evidencing a synergic effect of the microorganisms. The use of the same inoculum for the treatment of a palm oil mill effluent led to a removal of 75 % organic matter and 72 % oil and grease after 48 h. Our results demonstrated the ability of these isolates to use palm oil as sole carbon source and effectively decrease the concentration of pollutants in palm oil mill effluents in a short period of time. The use of these microorganisms may provide adaptive advantages that could improve POME remediation processes, especially with mixtures of native bacteria and yeast able to degrade palm oil as sole carbon source.
- PublicaciónAcceso abiertoMicrobial community dynamics and electricity generation in MFCs inoculated with POME sludges and pure electrogenic culture(2021-10-26) Albarracin-Arias, Jorge A.; Chang-PingYu; Maeda, Toshinari; Valdivieso Quintero, Wilfredo; Sanchez-Torres, Viviana; CibasPalm Oil Mill Effluent (POME) requires treatment before disposal due to its high organic matter content. In this study, the electrical performance and wastewater treatment efficiency were evaluated for Microbial Fuel Cells (MFC) treating unsterile POME with chemical oxygen demand (COD) from 200 to 10 000 mg/L. Since the inoculum type is a key factor in MFC performance, three types of sludge (methanogenic sludge (MS), facultative sludge (FS), and dry sludge (DS), obtained from the current POME treatment ponds were evaluated as inoculum. Dry sludge (DS) developed a maximum power output of 3.30 W/m3 by oxidizing 71% out of the COD provided by POME (1000 mg/L). Also, raw POME microbiota contributed to an enrichment of the community in DS inoculum along with the operation, in which Geobacter was the predominant genus reaching a current generation of 247 mA/m2 and a power density of 2.36 W/m3. Conversely, pure electrogenic (Shewanella sp.) inoculation led to a diversification process, resulting in a lower current generation of 52 mA/m2 and a power density of 0.10 W/m3. Consequently, microbial community dynamics revealed that MFC inoculation tends to a microbial equilibrium wherein generation of high current density was achieved by gradual microbial enrichment rather than external electrogenic invasion.