Manabu Fujii Lab, Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology


ナノ材料を活用した革新的嫌気性消化技術の開発 / Development of innovative anaerobic digestion technology using nanomaterials


The development of energy production technologies from waste and biomass is an important social issue for the realization of a sustainable society based on renewable energy. Anaerobic digestion technology is known as a sewage treatment technology that utilizes microorganisms to convert waste organic matter into useful energy sources (e.g., hydrogen gas, ethanol, and methane gas). The activated sludge from the sewage treatment process is one of the most common industrial wastes, and if this waste organic matter can be effectively converted into an energy source, the emission of greenhouse gases can be reduced, which is an important step towards building a sustainable society. Traditionally, anaerobic digestion technology has been attracting attention as a clean waste treatment, but its slow treatment process by microorganisms has been a bottleneck. In this research, we are focusing on new nanomaterials (e.g., nanocarbons, nano-metallic particles, and their composites), and aim to increase the reaction efficiency in anaerobic digestion and biogas (hydrogen gas) production by adding these nanomaterials to the reaction tank. The roles (functions) of nanomaterials in anaerobic digestion include providing trace amounts of essential metals as nutrients for microorganisms, improving the efficiency of electron transfer (DIET) between microorganisms due to the high conductivity of the nanomaterials, and as an auxiliary agent in enzymatic reactions. Recently, there have been increasing number of studies addressing the efficiency of anaerobic digestion reactions using nanomaterials. In this study, we investigate the effects of metal oxide (hematite, nickel oxide, and zinc oxide) and nanocarbon (graphene) as nanomaterials, and the effects of culture conditions, such as reactor configuration, operating conditions, substrate composition, and essential nutrients and micronutrients, on anaerobic microbial flora and hydrogen gas production. The results showed that in the mixed system of nanoparticles, the biogas production was 1.5 times more efficient than that of conventional anaerobic digestion in the field of biogas production (see figure). Another feature of this study is the search for effective operating conditions and microbial groups for biogas production, and optimization of energy recovery technology from waste activated sludge by environmental economic analysis. This study is being conducted in collaboration with the Egypt-Japan University of Science and Technology (E-JUST).



  • 科研費特別研究員奨励費2018-19年度「廃棄活性汚泥からの生物燃料生産効率化を目的としたカーボン金属ナノ複合材料の開発」(研究代表)等、Elreedy, A. Fujii, M., Koyama M. Nakasaki, N., Tawfik, A., Enhanced fermentative hydrogen production from industrial wastewater using mixed culture bacteria incorporated with iron, nickel, and zinc-based nanoparticles, Water Research, Elsevier, Vol 151, 349-361, 2019.

東京工業大学 環境・社会理工学院 土木・環境工学系 藤井 学 研究室 〒152-8552 東京都目黒区大岡山2-12-1-M1-22 / TEL: 03-5734-3687 / E-mail: fujii.m.ah(at)
Manabu Fujii Lab, Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1-M1-22, Ookayama, Meguro-ku, Tokyo 152-8552, Japan / TEL: +81-3-5734-3687 / E-mail: fujii.m.ah(at)