Contact us

Research Support Office Research Advancement Division. Tokyo University of Agriculture and Technology

TEL +81-42-367-5944
FAX +81-42-367-5946

This program is supported by MEXT’s scientific technology human resource development fee grant, "Program to Disseminate Tenure Tracking System".

Contact us via E-mail

Home > Introduction of our tenure-track faculties > Riya Shohei

Introduction of our tenure-track faculties

Riya Shohei

Affiliation Institute of Engineering
Division Division of Applied Chemistry
Research field Environmental Engineering
Keyword(S) Biomass, Soil, Anaerobic digestion, Greenhouse gas, Nutrient
Research experience

・2012.4-2013.3 JSPS Research fellow (DC2) (TUAT)
・2013.4-2014.3 JSPS Research fellow (PD) (TUAT)
・2014.4-2019.3 Assistant Professor (TUAT)

Educational background

・B.C.: Department of Chemical Engineering, TUAT (2007)
・M.S.: Graduate School of Engineering, TUAT (2009)
・Ph.D. (Engineering): Tokyo University of Agriculture and Technology (2012)


・TUAT Collaboration Award 2018, A. Terada, Y. Hashimoto, S. Riya
・Outstanding Early Career Researcher Poster Award (5th International EcoSummit, 2016, France)

Selected papers and publications

・L. Meng, L. Xie, S. Riya, A. Terada, M. Hosomi, Impact of turning waste on performance and energy balance in thermophilic solid-state anaerobic digestion of agricultural waste, Waste Management, 2019, 183-191
・S. Riya, K. Suzuki, L. Meng, S. Zhou, A. Terada, M. Hosomi, The influence of the total solid content on the stability of dry-thermophilic anaerobic digestion of rice straw and pig manure, Waste management, 2018, 76, 350-356
・L. Meng, L. Xie, C. T. Kinh, T. Suenaga, T. Hori, S. Riya, A. Terada, M. Hosomi, Influence of feedstock-to-inoculum ratio on performance and microbial community succession during solid-state thermophilic anaerobic co-digestion of pig urine and rice straw, Bioresource Technology, 2018, 252, 127-133
・S. Riya, Y. Takeuchi, S. Zhou, A. Terada, M. Hosomi, Nitrous oxide production and mRNA expression analysis of nitrifying and denitrifying bacterial genes under floodwater disappearance and fertilizer application, Environmental Science and Pollution Research, 2017, 24, 15852-15859
・S. Riya, K. Sawayanagi, K. Suzuki, S. Zhou, A. Terada, M. Hosomi, Digestibility of Riverbed Plants by Dry-Thermophilic Anaerobic Digestion, Kagaku Kogaku Ronbunshu, 2017, 43, 224-230 (in Japanese)
・S. Zhou, S. Borjigin, S. Riya, M. Hosomi, Denitrification-dependent anammox activity in a permanently flooded fallow ravine paddy field, Ecological Engineering, 2016, 95, 452-456
・S. Riya, S. Zhou, Y. Kobara, M. Sagehashi, A. Terada, M. Hosomi, Influence of Nitrogen Loading and Plant Nitrogen Assimilation on Nitrogen Leaching and N2O Emission in Forage Rice Paddy Fields Fertilized with Liquid Cattle Waste, Environmental Science and Pollution Research, 2015, 22, 5762-5771
・S. Riya, S. Zhou, Y. Kobara, M. Sagehashi, A. Terada, M. Hosomi, Effects of nitrogen loading rate on CH4 and N2O emissions during cultivation and fallow periods from forage rice fields fertilized with liquid cattle waste, Journal of Environmental Management, 2015, 161, 124-130
・S. Riya, M. Katayama, E. Takahashi, S. Zhou, A. Terada, M. Hosomi, Mitigation of Greenhouse Gas Emissions by Water Management in a Forage Rice Paddy Field Supplemented with Dry-Thermophilic Anaerobic Digestion Residue, Water Air and Soil Pollution, 2014, 225, 2118
・S. Riya, J. Min, S. Zhou*, W.M. Shi, M. Hosomi, Short-term responses of nitrous oxide emissions and concentration profiles to fertilization and irrigation in greenhouse vegetable cultivation, Pedosphere, 2012, 22, 764-775
・S. Riya, S. Zhou, Y. Watanabe, M. Sagehashi, A. Terada, M. Hosomi, CH4 and N2O emissions from different varieties of forage rice (Oryza sativa L.) treating liquid cattle waste, Science of the Total Environment, 2012, 419, 178-186

Research Description

I’m interested in environmental engineering for waste management, and soil conservation and restoration. Livestock waste or sewage sludge have been treated by biological wastewater treatment or landfilling. These wastes contain organic matter or nutrients for renewable energy source or fertilizer. Therefore, I’m studying “conversion of waste into valuable products” and “disposal method with low environmental loading” in order to manage such waste sustainably. For “conversion of waste into valuable products”, I study anaerobic digestion, in which organic matter are biologically decomposed into carbon dioxide and methane in the absence of oxygen. In the waste treatment, part of the waste can not be decomposed completely, and some residue is produced. The residue can be used for fertilizer because it contains nutrient for plant growth. However, improper use causes water environmental pollution, or greenhouse gas emission. Therefore, Im also studying method to incorporate such residue or modify itself.

About TUAT's tenure-track program

It is important to conduct education, research and administration works efficiently, because I need more achievements during 5 years of tenure-track program. The tenure-track program provides start up budget and mentor faculty etc. Thanks to these financial and personnel helps, I could start my laboratory works smoothly.

Future aspirations

would like to educate persons, who can work with a broad perspective. So, I would like to educate students so that he or she can study their process with consideration of upper or lower stream.