tailieunhanh - BÁO CÁO " LIPID PRODUCTION FROM MICROALGAE AS A PROMISING CANDIDATE FOR BIODIESEL PRODUCTION "

Recently, several strains of microalgae have been studied as they contain high lipid content capable to be converted to biodiesel. Fresh water microalgae Chlorella vulgaris studied in this research was one of the proof as it contained high triacyl glyceride which made it a potential candidate for biodiesel production. Factors responsible for good growing of microalgae such as CO2 and nitrogen concentration were investigated. It was found that total lipid content was increased after exposing to media with not enough nitrogen concentration. However, under this nitrogen depletion media, the growth rate was very slow leading to lower lipid productivity. The. | MAKARA TEKNOLOGI VOL. 13 NO. 1 APRIL 2009 47-51 LIPID PRODUCTION FROM MICROALGAE AS A PROMISING CANDIDATE FOR BIODIESEL PRODUCTION Arief Widjaja Department of Chemical Engineering Institute of Technology Sepuluh November Surabaya 60111 Indonesia E-mail arief_w@. id Abstract Recently several strains of microalgae have been studied as they contain high lipid content capable to be converted to biodiesel. Fresh water microalgae Chlorella vulgaris studied in this research was one of the proof as it contained high triacyl glyceride which made it a potential candidate for biodiesel production. Factors responsible for good growing of microalgae such as CO2 and nitrogen concentration were investigated. It was found that total lipid content was increased after exposing to media with not enough nitrogen concentration. However under this nitrogen depletion media the growth rate was very slow leading to lower lipid productivity. The productivity could be increased by increasing CO2 concentration. The lipid content was found to be affected by drying temperature during lipid extraction of algal biomass. Drying at very low temperature under vacuum gave the best result but drying at 60oC slightly decreased the total lipid content. Keywords microalgae lipid productivity biodiesel nitrogen concentration 1. Introduction Microalga is a photosynthetic microorganism that is able to use the solar energy to combine water with carbon dioxide to create biomass. Because the cells grow in aqueous suspension they have more efficient access to water CO2 and other nutrients. Microalgae growing in water have fewer and more predictable process variables sunlight temperature than higher plant systems allowing easier extrapolation from one site even climatic condition to others. Thus fewer sitespecific studies are required for microalgae than for example tree farming. Also microalgae grow much faster than higher plants and require much less land areas. However the utilization of .