RESUMO
Mushroom production on coffee pulp as substrate generates an intense black residual liquid, which requires suitable treatment. In the present study, Pleurotus ostreatus growth in wastewater from mushroom farm was evaluated as a potential biological treatment process for decolourisation as well as to obtain biomass (liquid inoculum). Culture medium components affecting mycelial growth were determined, evaluating colour removal. Laccase activity was monitored during the process. P. ostreatus was able to grow in non diluted WCP. Highest biomass yield was obtained when glucose (10 g/l) was added. The addition of this carbon source was necessary for efficient decolourisation. Agitation of the culture improved biodegradation of WCP as well as fungal biomass production. Laccase and manganese-independent peroxidase activities were detected during fungal treatment of the WCP by P. ostreatus CCEBI 3024. The laccase enzyme showed good correlation with colour loss. Both wastewater colour and pollution load (as chemical oxygen demand) decreased more than 50% after 10 days of culture. Phenols were reduced by 92%.
Assuntos
Agaricales , Agricultura , Cor , Pleurotus/metabolismo , Poluentes da Água/metabolismo , Meios de CulturaRESUMO
Se evaluó el efecto del tiempo de exposición a la luz durante el período de fructificación en la concentración de micosteroles (ergosterol y su peróxido) de Pleurotus ostreatus var. florida, cultivado mediante fermentación en estado sólido sobre residuales del cacao en Ecuador. La exposición del hongo a la luz a tiempos menores de 12 h disminuyó la eficiencia biológica en el 68 (por ciento) y el rendimiento en el 63 (por ciento). No se apreciaron mayores variaciones en la concentración de los compuestos lipídicos totales en los cultivos, y las concentraciones de micosteroles totales, determinadas por cromatografía gaseosa, mostraron un aumento en función de la cantidad de luz recibida: 115, 141 y 349 mg (por ciento) correspondientes a tiempos de exposición de 4, 8 y 12 h. Estos resultados permiten abordar con mayor profundidad el potencial de esta especie como materia prima para la obtención de ergosterol (provitamina D2)