Abstract
This study aimed to assess the generation of biodiesel via enzymatic transesterification (commercial Candida antarctica lipase) using four types of oily waste from environmental sanitation, with the intention of utilising this waste not only to decrease the cost of biofuel but also to mitigate possible negative impacts on the environment. Using factorial experimental design (32), the best temperature and molar ratio (oil:alcohol) conditions were evaluated for each type of catalyser for the studied waste types. The best conversion (96.5 %) was obtained with the C. antarctica lipase (5 % w/w oil/24 h) and raw material from the grease trap at the university restaurant at 50 °C and a molar ratio of 1:9 (oil:alcohol). Fats from industrial food grease trap, university restaurant grease trap, scum from the grease trap at the Wastewater Treatment Station and sludge from sumps and septic tanks were used as feedstock for biodiesel production.
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