Abstract
An alternative for production of biodiesel is the use of lipids from microalgae. The process has different steps such as microalgae cultivation harvesting, lipids extraction, and transesterification. One of the most important steps is the microalgae separation from the culture before lipid extraction. Thus, the purpose of the present study is to compare different methods of microalgae harvesting and total lipids extracting for freshwater Desmodesmus subspicatus microalga. The methods used for harvesting were chemical coagulation and electrocoagulation. Both methods achieved high values of recovery efficiency (90%). However, electrocoagulation was considered more attractive because of its lower power consumption and the requirement of high dosages of coagulants for chemical coagulation. Two methods of extraction, Soxhlet and ultrasound irradiation, were tested using different solvents. The highest lipid extraction (36%) was obtained with ultrasound irradiation and ethanol. Thus, ultrasound-assisted extraction appears to be an efficient method for lipid extraction from D. subspicatus.
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