Assistant Lecturer

Stella Chan On Sun

Profile

Specialized Field

Water treatment engineering, material engineering

Research theme

1. Promoting methane production using conductive materials
2. Development of gel immobilization technology for methanogenic microorganisms
3. Improving the functionality of immobilized microorganisms and elucidating their behavior

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research content

Methane fermentation is an environmentally friendly technology that uses microorganisms to decompose organic matter in wastewater and waste materials, producing methane gas. Methane gas can be used as energy for power generation and heat, contributing to a sustainable society. However, methane fermentation has the problem of slow processing speed. Recently, a mechanism called DIET (Direct Interspecies Electron Transfer) has been attracting attention, and it has been found that it is possible to use conductive materials to activate cooperation between microorganisms and make methane fermentation more efficient. However, in conventional methods, the microorganisms and conductive materials are dispersed in the liquid and cannot come into contact efficiently, so DIET cannot be effectively induced.
In my research, I developed a method to promote DIET more effectively by immobilizing microorganisms and conductive materials in a gel and increasing the contact efficiency. This new approach enables faster and more stable methane fermentation than ever before. By combining material engineering and water treatment technology, I aim to contribute to a sustainable society by maximizing the power of microorganisms and producing bioenergy efficiently!

Subjects in charge

Basic Chemistry Experiments, Materials Science Experiments, Physical Chemistry Experiments

Main career, work history, and academic background

2016: Enrolled in Faculty of Science and Engineering Department of Science and Engineering for Sustainable Innovation at Soka University
2020 Graduated from Soka University Faculty of Science and Engineering Department of Science and Engineering for Sustainable Innovation
Enrolled in the Master's program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University
2022 Graduated from the Master's Program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University [Master's in Engineering]
Enrolled in the doctoral program at the Graduate School Graduate School of Science and Engineering Soka University Environmental Engineering for Symbiosis Major
2025: Graduated from the Doctoral Program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University [PhD in Engineering]
2025: Assistant Lecturer Department of Science and Engineering for Sustainable Innovation Faculty of Science and Engineering Soka University

Main Papers and Publications

Stella Chan, Kento Nishi, Mitsuhiko Koyama, Tatsuki Toda, Tasushi Matsuyama and Junichi Ida.
Combined effects of various conductive materials and substrates on enhancing methane production performance.
Biomass and Bioenergy. Vol.178: 106977, 2023

Stella Chan, Kento Nishi, Mitsuhiko Koyama, Tasushi Matsuyama and Junichi Ida.
Advanced anaerobic digestion by co-immobilization of anaerobic microbes and conductive particles in hydrogel for enhanced direct interspecies electron transfer.
Biochemical Engineering Journal, Vol. 213: 109563, 2025

Specialized Field

Water treatment engineering, material engineering

Research theme

1. Promoting methane production using conductive materials
2. Development of gel immobilization technology for methanogenic microorganisms
3. Improving the functionality of immobilized microorganisms and elucidating their behavior

​​​​

research content

Methane fermentation is an environmentally friendly technology that uses microorganisms to decompose organic matter in wastewater and waste materials, producing methane gas. Methane gas can be used as energy for power generation and heat, contributing to a sustainable society. However, methane fermentation has the problem of slow processing speed. Recently, a mechanism called DIET (Direct Interspecies Electron Transfer) has been attracting attention, and it has been found that it is possible to use conductive materials to activate cooperation between microorganisms and make methane fermentation more efficient. However, in conventional methods, the microorganisms and conductive materials are dispersed in the liquid and cannot come into contact efficiently, so DIET cannot be effectively induced.
In my research, I developed a method to promote DIET more effectively by immobilizing microorganisms and conductive materials in a gel and increasing the contact efficiency. This new approach enables faster and more stable methane fermentation than ever before. By combining material engineering and water treatment technology, I aim to contribute to a sustainable society by maximizing the power of microorganisms and producing bioenergy efficiently!

Subjects in charge

Basic Chemistry Experiments, Materials Science Experiments, Physical Chemistry Experiments

Main career, work history, and academic background

2016: Enrolled in Faculty of Science and Engineering Department of Science and Engineering for Sustainable Innovation at Soka University
2020 Graduated from Soka University Faculty of Science and Engineering Department of Science and Engineering for Sustainable Innovation
Enrolled in the Master's program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University
2022 Graduated from the Master's Program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University [Master's in Engineering]
Enrolled in the doctoral program at the Graduate School Graduate School of Science and Engineering Soka University Environmental Engineering for Symbiosis Major
2025: Graduated from the Doctoral Program Environmental Engineering for Symbiosis Major at the Graduate School of Science and Engineering Soka University [PhD in Engineering]
2025: Assistant Lecturer Department of Science and Engineering for Sustainable Innovation Faculty of Science and Engineering Soka University

Main Papers and Publications

Stella Chan, Kento Nishi, Mitsuhiko Koyama, Tatsuki Toda, Tasushi Matsuyama and Junichi Ida.
Combined effects of various conductive materials and substrates on enhancing methane production performance.
Biomass and Bioenergy. Vol.178: 106977, 2023

Stella Chan, Kento Nishi, Mitsuhiko Koyama, Tasushi Matsuyama and Junichi Ida.
Advanced anaerobic digestion by co-immobilization of anaerobic microbes and conductive particles in hydrogel for enhanced direct interspecies electron transfer.
Biochemical Engineering Journal, Vol. 213: 109563, 2025