Journal of the Japan Institute of Energy
Online ISSN : 1882-6121
Print ISSN : 0916-8753
ISSN-L : 0916-8753
Volume 97 , Issue 12
Showing 1-6 articles out of 6 articles from the selected issue
Table of Contents
Original Paper
  • Yuka FUKUDA, Shun TSUTSUMI, Yasuhiro SAITO, Yohsuke MATSUSHITA, Hideyu ...
    2018 Volume 97 Issue 12 Pages 353-361
    Published: December 20, 2018
    Released: December 28, 2018

    Aurantiochytrium, a heterotrophic microalga, produces hydrocarbons inside its cells and has a higher growth rate than other photosynthetic microalgae. To investigate a possible method of extracting hydrocarbons from wet Aurantiochytrium cells, cell cultures of Aurantiochytrium were treated with a high-pressure homogenizer. The influence of cell disruption and extraction time on the cell morphology, hydrocarbon yield, and energy balance of hydrocarbon extraction was evaluated. The hydrocarbon yield increased with an increase in extraction time regardless of cell disruption. After one round of the homogenizing treatment in which cells were fragmented (one-pass treatment), a second round (two-pass treatment) did not cause any additional morphological change. For the 40-min extraction, the yield of hydrocarbon from disrupted samples was found to be over ten times higher than that of undisrupted ones. In contrast, for the 180-min extraction, the yield of undisrupted samples was almost the same as that of disrupted ones because the cells of Aurantiochytrium were disrupted by extended contact with n-hexane over the longer extraction time. Furthermore, the input energy of the 40-min extraction with cell disruption was 78% lower than that of the 180-min extraction without cell disruption to obtain almost the same hydrocarbon yield.

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Technical Paper
Technical Report
  • Akane SAKURAI
    2018 Volume 97 Issue 12 Pages 379-385
    Published: December 20, 2018
    Released: December 28, 2018

    In contrast to other renewable energy resources, solar power facilities have increased rapidly in Japan after the introduction of Feed-in Tariff in 2012. This paper examines the present structure of mega solar power businesses in Japan. Only less than a quarter of enterprises managing mega solar power facilities have headquarters in the same prefectures as the facilities. These enterprises have mainly been established by private companies, but less so by local governments, cooperatives and foundations. The types of the parent companies basing in the same prefectures differ from those in other prefectures. This indicates that the profits of mega solar power facilities have seldom returned to local communities but rather drained to big cities. This paper concludes that mega solar power facilities have much less effect on local economy than expected.

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