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Reduction in Energy Requirement and CO 2 Emission for Microalgae Oil Production Using Wastewater

Author

Listed:
  • Riaru Ishizaki

    (Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan)

  • Ryozo Noguchi

    (Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan)

  • Agusta Samodra Putra

    (Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan
    Research Center for Chemistry, Indonesian Institute of Sciences, Serpong 15314, Indonesia)

  • Sosaku Ichikawa

    (Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan)

  • Tofael Ahamed

    (Faculty of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan)

  • Makoto M Watanabe

    (Algae Biomass and Energy System R&D Center, University of Tsukuba, Ibaraki 305-8572, Japan)

Abstract

A comparative evaluation of energy requirement and CO 2 emission was performed for native polyculture microalgae oil production in a wastewater treatment plant (WWTP). The wastewater provided nutrients for algae growth. Datasets of microalgae oil production and their details were collected from the Minamisoma pilot plant. Environmental impact estimation from direct energy and material balance was analyzed using SimaPro ® v8.0.4. in two scenarios: existing and algal scenarios. In the existing scenario, CO 2 emission sources were from wastewater treatment, sludge treatment, and import of crude oil. In the algal scenario, CO 2 emission with microalgae production was considered using wastewater treatment, CO 2 absorption from growing algae, and hydrothermal liquefaction (HTL) for extraction, along with the exclusion of exhausted CO 2 emission for growing algae and use of discharged heat for HTL. In these two scenarios, 1 m 3 of wastewater was treated, and 2.17 MJ higher heating value (HHV) output was obtained. Consequently, 2.76 kg-CO 2 eq/m 3 -wastewater in the existing scenario and 1.59 kg-CO 2 eq/m 3 -wastewater in the algal scenario were calculated. In the HTL process, 21.5 MJ/m 3 -wastewater of the discharged heat energy was required in the algal scenario. Hence, the efficiency of the biocrude production system will surpass those of the WWTP and imported crude oil.

Suggested Citation

  • Riaru Ishizaki & Ryozo Noguchi & Agusta Samodra Putra & Sosaku Ichikawa & Tofael Ahamed & Makoto M Watanabe, 2020. "Reduction in Energy Requirement and CO 2 Emission for Microalgae Oil Production Using Wastewater," Energies, MDPI, vol. 13(7), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1641-:d:340343
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    References listed on IDEAS

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    1. Nugroho Adi Sasongko & Ryozo Noguchi & Junko Ito & Mikihide Demura & Sosaku Ichikawa & Mitsutoshi Nakajima & Makoto M. Watanabe, 2018. "Engineering Study of a Pilot Scale Process Plant for Microalgae-Oil Production Utilizing Municipal Wastewater and Flue Gases: Fukushima Pilot Plant," Energies, MDPI, vol. 11(7), pages 1-24, June.
    2. Dhani S. Wibawa & Muhammad A. Nasution & Ryozo Noguchi & Tofael Ahamed & Mikihide Demura & Makoto M. Watanabe, 2018. "Microalgae Oil Production: A Downstream Approach to Energy Requirements for the Minamisoma Pilot Plant," Energies, MDPI, vol. 11(3), pages 1-16, February.
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    Cited by:

    1. Kenichi Furuhashi & Fumio Hasegawa & Manabu Yamauchi & Yutaka Kaizu & Kenji Imou, 2020. "Improving the Energy Balance of Hydrocarbon Production Using an Inclined Solid–Liquid Separator with a Wedge-Wire Screen and Easy Hydrocarbon Recovery from Botryococcus braunii," Energies, MDPI, vol. 13(16), pages 1-14, August.
    2. Riaru Ishizaki & Agusta Samodra Putra & Sosaku Ichikawa & Tofael Ahamed & Makoto M. Watanabe & Ryozo Noguchi, 2020. "Microalgae Oil Production Using Wastewater in Japan—Introducing Operational Cost Function for Sustainable Management of WWTP," Energies, MDPI, vol. 13(20), pages 1-19, October.

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