No abstract

Biodiesel is a fuel derived from renewable raw materials with the potential to change the world's energy matrix, and reduce the damage caused by fossil fuels to the environment and human health. The disadvantage of biodiesel is its low oxidative stability which affects its storage time. In this study, experimental biodiesel blends were used to identify the influences of carotenoid and free fatty acid contents on storage stability by using UV-VIS spectroscopy. Binary biodiesel blends were prepared blending buriti biodiesel contents ranging from 30% (v/v), 60% (v/v), and 90% (v/v) with soybean, sunflower, and beef tallow biodiesel. The blends were stored up to 45 days to compare the oxidative stabilities. The binary biodiesel blend composed by 90% buriti biodiesel and 10% beef tallow one presented the highest oxidative stability during the evaluated storage time.

The use of waste for energy production through processes like pyrolysis, combustion and oil extraction is a sustainable solution to serious environmental problems like centralization of the energy matrix in nonrenewable materials and pollutants and the volume of urban solid waste. In this context, this work aimed to analyze the energy potential of two solid waste biomasses: municipal slaughter sludge and wood sawdust generated in the city of Gurupi –TO. Were evaluated the contents of humidity, volatile content, ash, fixed carbon through the immediate analysis and upper (PCS) and lower (PCI) calorific value were evaluated for all samples collected. In the immediate analysis it was found that the sludge sample had higher ash content than the sawdust and both had high volatile contents. The sawdust presented higher calorific power (4882 cal kg-1) than the sludge (3952.5 cal kg-1), but the process of obtaining energy from the sludge requires less heat. It can also be concluded that both materials present viable alternatives for obtaining energy.