膜を用いた微細藻類の濃縮・回収技術

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  • 山村 寛
    中央大学 理工学部 人間総合理工学科

書誌事項

タイトル別名
  • Harvesting Technology for Microalgae in Biodiesel Production Process with Membranes
  • マク オ モチイタ ビサイ ソウルイ ノ ノウシュク ・ カイシュウ ギジュツ

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説明

For the cell harvesting process, membrane filtration has been gaining popularity instead of coagulation–flotation or centrifugation process, because it can easily concentrate the algae cells more than 60 g/L with a low energy consumption. The major drawback of this technology is membrane fouling, which increase the operation cost to a large extent as a result of reduction of membrane permeability. For more efficient use of membrane, we should increase the operation flux to 4.0 m3/m2/day, but it is still difficult to be achieved with the normal membrane and general washing condition. In this study, we prepared the novel hollow fiber membrane having the nominal pore size of 2.0 µ m and optimized the washing condition to achieve the 30–times concentration with operation flux of 4.0 m3/m2/day. As a result of the use of novel membrane and optimal washing condition, we could achieve 30–fold concentration with a flux of 4.0 m3/m2/day. Furthermore, the final trans–membrane pressure was low enough (60 kPa), implying that there was a possibility to be able to set higher operation flux or higher concentration level. Then, we developed novel harvesting process, which includes both membrane filtration and sedimentation process. We optimize the operation condition in lab–scale experiment and applied it to the pilot-scale system. As a result of the pilot-scale experiment, 300–fold concentration and high flux operation of 4.0 m/d was found to be achieved. In addition, we make a tool to predict the operation flux based on the analysis of fouling index and particle size distribution of microalgae.

収録刊行物

  • 膜

    膜 41 (4), 142-149, 2016

    日本膜学会

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