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A new green technology: hydrothermal electrolysis for the treatment of biodiesel wastewater

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Abstract

Recently, biodiesel has become more attractive as an alternative diesel fuel because it is renewable, biodegradable, non-toxic, and environmentally friendly. In this study, we have developed a new green process called “hydrothermal electrolysis”, by which industrial wastewater can be converted to more value-added chemicals under high-temperature and high-pressure aqueous conditions. We prepared model biodiesel wastewater and carried out hydrothermal electrolysis experiments by using both a continuous flow reactor and a batch autoclave. Current efficiencies and the effects of reaction time and reaction temperature on the decomposition of biodiesel wastewater and removal of total organic carbon (TOC) were investigated under various operating conditions. It was found that conversions of both TOC and glycerol inside the model biodiesel wastewater increased with increasing applied current. With the autoclave, the maximum glycerol conversion was recorded as 83% by applying 1 A current at 250 °C, whereas with the flow reactor, 75% of glycerol was converted into gas and liquid products under the effect of 1 A current for 60 min at a reaction temperature of 280 °C. In the case of TOC removal from the liquid product solution, under identical conditions, it was found that 23 and 15.9% TOC conversions were achieved by the batch and continuous flow reactors, respectively.

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Acknowledgments

The authors like to thank the Kumamoto University Global Centre of Excellence (COE) Program “Global Initiative Centre for Pulsed Power Engineering” for their financial support of this study.

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Authors and Affiliations

  1. Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan

    Asli Yuksel & Mitsuru Sasaki

  2. Bioelectrics Research Center, Kumamoto University, 2-39-1 Kurokami, Kumamoto, 860-8555, Japan

    Motonobu Goto

Authors
  1. Asli Yuksel
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  2. Mitsuru Sasaki
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  3. Motonobu Goto
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Correspondence to Motonobu Goto.

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Yuksel, A., Sasaki, M. & Goto, M. A new green technology: hydrothermal electrolysis for the treatment of biodiesel wastewater. Res Chem Intermed 37, 131–143 (2011). https://doi.org/10.1007/s11164-011-0260-8

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  • DOI: https://doi.org/10.1007/s11164-011-0260-8

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