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Microalgae Oil Production Using Wastewater in Japan—Introducing Operational Cost Function for Sustainable Management of WWTP

Author

Listed:
  • Riaru Ishizaki

    (Graduate School 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)

  • Ryozo Noguchi

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

Abstract

A comparative evaluation of economic efficiency was performed for native polyculture microalgae oil production in an oxidation ditch (OD) process wastewater treatment plant (WWTP). A cost function was developed for the process. The operational cost per 1 m 3 of wastewater (w.w.) was 1.34 $/m 3 -w.w. in the existing scenario, 1.29 $/m 3 -w.w. in algal scenario A (no cost for CO 2 and waste heat) and 1.36 $/m 3 -w.w. in algal scenario B (no cost for CO 2 ). The conditions were set as follows: hydraulic retention time (HRT): 4 days, microalgal productivity: 0.148 g/L and daily treatment volume: 81.6 m 3 -w.w./d. The cost differences were related to the increase in polymer flocculants for algae separation (+0.23 $/m 3 -w.w), carbon credits from CO 2 absorption (−0.01 $/m 3 -w.w), the sales of biocrude (−0.04 $/m 3 -w.w) and sludge disposal (−0.18 $/m 3 -w.w). Hence, the introduction of the algae scenario was the same cost-effective as the existing scenario. Microalgae oil production in an OD process WWTP can serve as a new energy system and reduce the environmental load in a society with a declining population.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5310-:d:426893
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    References listed on IDEAS

    as
    1. 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.
    2. Konstantinos Anastasakis & Patrick Biller & René B. Madsen & Marianne Glasius & Ib Johannsen, 2018. "Continuous Hydrothermal Liquefaction of Biomass in a Novel Pilot Plant with Heat Recovery and Hydraulic Oscillation," Energies, MDPI, vol. 11(10), pages 1-23, October.
    3. 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.
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    1. Makoto M. Watanabe & Andreas Isdepsky, 2021. "Biocrude Oil Production by Integrating Microalgae Polyculture and Wastewater Treatment: Novel Proposal on the Use of Deep Water-Depth Polyculture of Mixotrophic Microalgae," Energies, MDPI, vol. 14(21), pages 1-29, October.

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