Solar energy is becoming increasingly important as an alternative energy source due to the demand for new energy and environmental concerns about reducing greenhouse gasses. Food scarcity and agricultural product loss are currently affecting the world as a result of poor drying and storage methods, which result in post-harvest losses. The developed passive mixed-mode solar dryer was tested at daytime, from 9:00 to 18:30 hours. The study focuses on the thermal evaluation of the passive mixed mode solar dryers using experimental methodologies. The solar dryer achieved a maximum air-drying temperature of 69.2°C while the flat plate solar collector achieved 68.8°C respectively. The average air-drying temperature was 50.1°C, while an ambient average temperature was 29°C. This research demonstrates that a passive mixed mode solar dryer can effectively dry food and benefiting the community.
Beverage and Food processing industries are extremely large consumers of energy and bio-waste producer worldwide. Due to its high concentration of organic compounds, which imposes a high biochemical oxygen to the waste's breakdown, disposal from these companies in the environment increases the risk of inconvenience to the ecosystem. In this context, the brewing industry's production phases included the fermentation of vegetable feedstock such as barley malt, hops, and grains that produces a variety of by-products. Fermented malts, hops, yeast and water which used for the beer production caused waste materials that are disposed as organic wastes. Experimentally the waste as anaerobic digestion feed was assessed. The idea was to support the environment by utilizing alternative energy using the bio-waste from the brewery industry. Samples from the Tanzanian Breweries Company Limited (TBL) Arusha branch were taken to the CAMARTEC biogas digester. The wastes in form of sludge were investigated for anaerobic digestion. The findings of this study showed that waste from the brewing sector may be converted into environmentally acceptable solutions to be used as a biogas.
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