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Circular Symbiosis Systems Lab
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A lab that designs systems to turn waste and unused resources into materials and energy.
AboutAbout the lab
Toward a society that uses waste as a resource.
The Circular Symbiosis Systems Lab researches how to make the fullest use of waste and the unused resources that lie dormant in local communities as new materials and energy.
It aims for a society that avoids producing waste as much as possible and uses it as a resource (a circular economy).
By combining basic experiments, field surveys, questionnaire and interview surveys, and modeling, the lab proposes waste flows and conversion systems that can actually be used in society.
A distinctive feature is that it takes on these problems not only from the technical side but also from the perspectives of economics, institutions, and human psychology and consensus building.
Key terms
- Circular economy
- An economic system that generates no waste and keeps using resources repeatedly while changing their form
- Methane fermentation
- A method in which microorganisms break down food waste, livestock manure, and similar materials to obtain methane gas that can be used as fuel
- Biomass
- Resources derived from living things, such as wood, crops, and food waste. They can be used as fuel or fertilizer
NewsLab news
Students receive the Outstanding Oral Presentation Award and the Outstanding Poster Award at the Research Presentation Meeting of the Japan Society of Material Cycles and Waste Management
A team including Professor Ishii receives the DAIKEN Award and the Real Tech Fund Award at EcoTech Grand Prix 2024
A master's student receives the Outstanding Poster Award at the Research Presentation Meeting of the Japan Society of Material Cycles and Waste Management
ResearchResearch themes
The lab aims to realize a circular society, a decarbonized society, and a society in harmony with nature together, and to build a sustainable society for developing countries and for future generations. From the three perspectives of planning, environmental conservation, and biomass, it studies flows and conversion systems for waste and other materials that can actually be used in society.
*Illustrative imagePlanning together with communities
The lab studies the making of national, prefectural, and municipal plans to realize carbon neutrality and a circular economy. Its work includes methods for building plans bottom-up together with local residents, optimizing waste treatment and recycling systems and facility locations, and analyzing how plans differ from region to region.
*Illustrative imageRecycling that protects the environment
The lab's research takes the viewpoint of avoiding "bad recycling" that uses too much energy or causes bad odors and groundwater pollution. For waste management in Southeast Asia and elsewhere that does not rely on incineration alone, it also studies mechanical biological treatment (MBT), which combines sorting, conversion of waste into fuel, composting, and methane fermentation.
*Illustrative imageUsing biomass locally
The lab aims to use biomass produced by photosynthesis effectively without overusing it. Paying attention not only to carbon but also to the nitrogen and phosphorus cycles, it carries out research aimed at building local systems, including composting, methane fermentation, thermal use of woody biomass, and conversion of agricultural residues into fuel.
MembersFaculty
The members of the Circular Symbiosis Systems Lab consist of faculty members, visiting faculty members, administrative staff, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKazuei Ishii
- Assistant ProfessorHam Geun-Yong
- Project Assistant ProfessorYuhei Tanaka
- Project Assistant ProfessorJumana Ali Falah Al-mallahi
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Biogas Photovoltaik Wind” Florian Gerlach (Nawaro) / CC BY-SA 3.0 (cropped)
- Planning together with communities: “Incineration plant of Saga city and pipeline” Peka / CC BY-SA 4.0 (cropped)
- Recycling that protects the environment: “MBT anaerobicdigesters” The original uploader was Vortexrealm at English Wikipedia. / CC BY-SA 2.5 (cropped)
- Using biomass locally: “Steam from compost heaps” Albarubescens / CC BY-SA 4.0 (cropped)
- Related lab (Resource Chemistry Lab): “Rio tinto river CarolStoker NASA Ames Research Center” Carol Stoker, NASA / Public domain (cropped)
- Related lab (Waste Disposal Engineering Lab): “Naka Waste Incineration Plant 01” Taisyo / CC BY-SA 3.0 (cropped)
- Related lab (Resource Circulation Materials Lab): “Laitier de haut fourneau à Fos-sur-Mer” Borvan53 / CC BY-SA 4.0 (cropped)
- Related lab (Global Development Informatics Lab): “Pipe Jacking Tunneling” Sabino Freitas Correa / CC BY-SA 4.0 (cropped)
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