RESUMEN
This paper adopts the hybrid use of soft systems methodology (SSM) as a process of inquiry into understanding the lack of a framework for evidence-based teaching (EBT) in hospitality and tourism education in Vietnam. By combining SSM techniques with interview data, we also develop an EBT framework for the hospitality and tourism profession. The proposed framework addresses three essential sources of evidence for teaching: (1) research-based professional and pedagogical methods, (2) industry-based materials to ensure education-industry linkage, and (3) instructors' knowledge, experience and assumptions about their teaching roles in the classroom. This conceptual framework can be used as a guideline for conducting relevant curriculum renewal and pedagogical reforms in hospitality and tourism institutions in Vietnam.
RESUMEN
In order to reduce input cost for microalgal cultivation, we investigated the feasibility of wastewater taken from a municipal WWTP in Busan, Korea as wastewater nutrients. The wastewaters used in this study were the effluent from a primary settling tank (PS), the effluent from an anaerobic digestion tank (AD), the conflux of wastewaters rejected from sludge-concentrate tanks and dewatering facilities (CR), and two combined wastewaters of AD:PS (10:90, v/v) and AD:CR (10:90, v/v). Chlorella sp. ADE5, which was isolated from the AD, was selected for the feasibility test. The highest biomass production (3.01 g-dry cell weight per liter) of the isolate was obtained with the combined wastewater ADCR, and it was 1.72 times higher than that with BG 11 medium. Interestingly, the cells cultivated with wastewater containing PS wastewater were easily separated from the culture and improved lipid content, especially oleic acid content, in their cells.
Asunto(s)
Biocombustibles/microbiología , Microalgas/química , Microalgas/fisiología , Aguas Residuales/microbiología , Purificación del Agua/métodos , Ciudades , Estudios de FactibilidadRESUMEN
This study assessed the usability of effluent water discharged from a secondary municipal wastewater treatment plant for mass cultivation of microalgae for biofuel production. It was observed that bacteria and protozoa in the effluent water exerted a negative impact on the growth of Chlorella sp. 227. To reduce the effect, filtration or UV-radiation were applied on the effluent water as pre-treatment methods. Of all the pretreatment options tested, the filtration (by 0.2 µm) resulted in the highest biomass and lipid productivity. To be comparable with the growth in the autoclaved effluent water, the filtration with a proper pore size filter (less than 0.45 µm) or UV-B radiation of a proper dose (over 1620 mJ cm(-2)) are proposed. These findings led us to conclude that the utilization can be realized only when bacteria and other microorganisms are greatly reduced or eliminated from the effluent prior to its use.