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Waste Disposal Engineering Lab
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The lab considers waste management as a system, from sorting to landfilling.
AboutAbout the lab
Solving waste problems as a system.
The Waste Disposal Engineering Lab studies waste from sorting through final disposal.
The lab views the waste problem as a "system" that connects generation, sorting, and collection with intermediate treatment, resource recovery, and landfilling.
Using both experimental, survey-based, and chemical-analysis methods and approaches such as questionnaires and data analysis, the lab aims to build comprehensive waste treatment systems.
Key terms
- Fly ash
- Fine ash that is carried up with the exhaust gas when waste is burned and is then collected
- Hexavalent chromium
- A highly toxic form of the metal chromium, strictly regulated under effluent standards
- Pyrolysis
- A reaction in which, when a material is heated, its molecules break apart before it burns and turn into gas, char, and other products
NewsLab news
A master's student won the Excellent Poster Presentation Award at the Hokkaido Branch Poster Presentation Meeting of the Japan Society of Material Cycles and Waste Management
A master's student won the Outstanding Poster Award at the 36th Research Presentation Conference of the Japan Society of Material Cycles and Waste Management
Doctoral and master's students won the Excellent Poster Presentation Award at the Hokkaido Branch Poster Presentation Meeting of the Japan Society of Material Cycles and Waste Management
ResearchResearch themes
Treating everything from waste sorting to final disposal as one system, the lab studies how to choose suitable technologies. Its work covers thermal treatment such as incineration, recovery of resources from the heavy metals contained in ash, and treatment of decontamination waste and of waste generated by the decommissioning of the Fukushima Daiichi Nuclear Power Plant.
*Illustrative imageBehavior of Chromium in Incineration Facilities
At several incineration facilities in Japan, the hexavalent chromium concentration in the water of ash pits, which are used to cool incineration ash, has become high, making discharge difficult. The lab is identifying what in the incineration ash causes the hexavalent chromium concentration to rise.
*Illustrative imageHow Waste Decomposes Under Heat
DEM-CFD, a method for numerically reproducing the inside of an incinerator, requires information on how waste pyrolyzes in the furnace. The lab measures weight changes in various types of waste during heating to investigate how pyrolysis proceeds.
*Illustrative imageRecovering Metals from Molten Fly Ash
Molten fly ash contains large amounts of metals such as zinc and lead that can be recovered by smelting, but it also contains large amounts of chlorine and other substances that are unnecessary for resource recovery. The lab investigates conditions for concentrating zinc and lead, centered on water washing, and also works on reducing the amount of water used.
*Illustrative imageRemoving Heavy Metals from Wastewater After Washing
Washing molten fly ash with water dissolves harmful heavy metals such as cadmium into the wastewater. To bring the wastewater below effluent standards, the lab studies how to lower its heavy metal concentrations, primarily by forming sulfides.
MembersFaculty
The members of the Waste Disposal Engineering Lab consist of faculty members, part-time researchers, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYasumasa Tojo
- Associate ProfessorIn-Hee Hwang
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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: “Naka Waste Incineration Plant 01” Taisyo / CC BY-SA 3.0 (cropped)
- Behavior of Chromium in Incineration Facilities: “Müllheizkraftwerk Schlacke” Dirk1981 / CC BY-SA 4.0 (cropped)
- How Waste Decomposes Under Heat: “Movinggrate” Ole Poulsen (The original uploader was Claush66 at English Wikipedia.) / Public domain (cropped)
- Recovering Metals from Molten Fly Ash: “Fly ash of a thermal power plant containing hollow cenospheres” Dr Anatoly / CC BY 4.0 (cropped)
- Removing Heavy Metals from Wastewater After Washing: “Cadmium (II) sulfide” Valeg96 / CC BY-SA 4.0 (cropped)
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- Related lab (循環共生システム): “Biogas Photovoltaik Wind” Florian Gerlach (Nawaro) / CC BY-SA 3.0 (cropped)
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