Large-scale biodiesel production using microalgae biomass of Nannochloropsis

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• 作者：Nasrin Moazami^a ; Alireza Ashori^b ; ^{ashori@irost.org} ; Reza Ranjbar^c ; Mehrnoush Tangestani^a ; Roghieh Eghtesadi^a ; Ali Sheykhi Nejad^a
• 关键词：Microalgae ; Biodiesel ; Nannochloropsis ; Raceway pond ; Paddlewheel speed ; Biomass
• 刊名：Biomass and Bioenergy
• 出版年：2012
• 期刊代码：3_09619534
• 类别：pw
• 出版时间：April, 2012
• 卷：39
• 期：Complete
• 页码：449-453
• 文件大小：696 K

摘要

The aim of this study is to investigate the large-scale algae production using Nannochloropsis sp. in indoor open ponds. One of the key factors in open pond productivity is the uniformity of distribution of nutrients and CO₂. Therefore, the effects of paddlewheel speeds (1.4, 2.1 and 2.8聽rad聽s^鈭?) on the productivity were also evaluated. The culture system used in the experiment consisted of three raceway ponds of 2000-L capacity each. Other parameters such as growth medium (seawater), illumination (150聽渭mol聽m^鈭?聽s^鈭?), pH (7.5聽卤聽0.2), water level (30聽cm), and temperature (25聽掳C) were kept constant during the two weeks experiments. In general, the results revealed that higher lipid content and biomass can be obtained by varying paddlewheel speeds. With increase in impeller speed from 1.4 to 2.1聽rad聽s^鈭? the biomass productivity significantly increased, which indicates that microalgae could access more nutrients, CO₂ and illumination. The maximum growth of 46聽g聽L^鈭?聽m^鈭? and lipid content of 52%were obtained after 14 days with 2.1聽rad聽s^鈭?. The amount of hydrocarbon was varied from 55 to 70聽mg聽L^鈭?聽day^鈭? cell weight, showing the best combination of biomass productivity and lipid content in indoor conditions. The present study showed the best combination of biomass productivity and lipid content in indoor conditions.