Microalgae harvesting and subsequent biodiesel conversion

作者：Dang Thuan Tran; Bich Hanh Le; Lee Duu Jong; Chen Ching Lung; Wang Hsiang Yu; Chang Jo Shu^*

来源：Bioresource Technology, 2013, 140: 179-186.

DOI：10.1016/j.biortech.2013.04.084

• Chlorella vulgaris
• Coagulation
• Immobilized lipase
• SrO/SiO2
• Transesterification

Chlorella vulgaris ESP-31 containing 22.7% lipid was harvested by coagulation (using chitosan and polyaluminium chloride (PACl) as the coagulants) and centrifugation. The harvested ESP-31 was directly employed as the oil source for biodiesel production via transesterification catalyzed by immobilized Burkholderia lipase and by a synthesized solid catalyst (SrO/SiO2). Both enzymatic and chemical transesterification were significantly inhibited in the presence of PACl, while the immobilized lipase worked well with wet chitosan-coagulated ESP-31, giving a high biodiesel conversion of 97.6% w/w oil, which is at a level comparable to that of biodiesel conversion from centrifugation-harvested microalgae (97.1% w/w oil). The immobilized lipase can be repeatedly used for three cycles without significant loss of its activity. The solid catalyst SrO/SiO2 worked well with water-removed centrifuged ESP-31 with a biodiesel conversion of 80% w/w oil, but the conversion became lower (55.7-61.4% w/w oil) when using water-removed chitosan-coagulated ESP-31 as the oil source.

• 出版日期2013-7