The influence of pH (7, 8 and 9) and CO2 source (pure CO2 or CO2 from flue gas) on both the performance of secondary domestic wastewater treatment and biomass productivity and composition in three outdoors pilot raceways was evaluated for 6 months. Average COD, TN, TP and E. coli removal efficiencies of 84±7%, 79±14%, 57±12% and 93±7%, respectively, were recorded. The influence of pH on wastewater treatment was negligible, while the supply of CO2 from flue gas supported higher COD, TOC and TP removals. Biomass productivities ranged from 4±0 g m-2 d-1 in December to 17±1 g m-2 d-1 in July. The highest C, N and P biomass contents (64.8%, 12.6 % and 2.4 %, respectively) were recorded when flue gas was supplied. Finally, while the protein content in the biomass remained constant (38.2±3.3%), the lipid and carbohydrate contents ranged from 5.8% to 23.0% and from 38.0% to 61.2%, respectively.
BACKGROUND: The hard cell wall of some microalgae hampers efficient methane production when using those substrates. The present study investigated the effect of two groups of biocatalysts, namely carbohydrases and proteases, applied to Chlorella vulgaris and Scenedesmus sp. for microalgae hydrolysis prior to anaerobic digestion.
El área de matemáticas se apoya en recursos visuales como gráficas, operaciones y procesos algorítmicos en el tablero, lo cual representa una dificultad para los estudiantes con discapacidad visual y genera exclusión en las aulas. Por esto, el presente estudio de caso tiene como objetivo identificar los factores socioculturales que inciden en la resolución de problemas matemáticos, a través de una metodología de enfoque etnográfico. Así, se plantea que los docentes deben generar un ambiente de participación e incorporar un modelo de educación diferencial en las aulas con el fin de eliminar factores socioculturales como la discriminación, exclusión y subestimación, que inciden en los procesos de resolución de problemas por parte de los estudiantes con discapacidad visual.
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