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Wajima Lab
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A lab for resources, environment, and recycling that turns waste into resources.
AboutAbout the lab
Turning waste into resources.
The Wajima Lab conducts research on resources, the environment, and recycling, aimed at building a sustainable society.
By understanding the basic physical properties of materials and changing their properties through physicochemical methods, the lab creates mechanisms for the effective use and recycling of waste.
The materials it handles are varied, from incineration ash and slag to plastics, seawater, and even lunar regolith.
The lab also works on developing technologies for environmental purification and resource recovery.
Key terms
- Mineral phase
- A component within a material that has a definite composition and crystal structure. It can change into a different phase depending on the treatment
- Molten salt
- A salt melted into a liquid at high temperature. It provides a medium for reactions that do not occur in aqueous solutions
- Adsorbent
- A material used to take specific components in a liquid or gas onto its surface so they can be extracted
NewsLab news
A PhD student received the Excellent Poster Award at the Academic Conference of the Society of Environmental and Resource Engineering
A master's student received the Excellent Poster Award at the international conference ICMR2025
A master's student received the Student Excellence Award at the 76th Annual Meeting of the Society of Sea Water Science, Japan
Associate Professor Takaaki Wajima received the Research Award of the Society of Sea Water Science, Japan
An undergraduate student received the Excellence Award at the Student Research Presentation Meeting of the Society of Sea Water Science, Japan
ResearchResearch themes
The lab takes up problems of resources such as energy, water, food, and mineral resources, as well as global environmental problems caused by human activity. By understanding the basic physical properties of materials and changing their properties through physicochemical methods, it develops systems for the effective use and recycling of waste, and technologies for environmental purification and resource recovery.
*Illustrative imageTurning waste into functional materials
Incineration ash, crushed-stone dust, and steelmaking slag are made mainly of minerals composed of silicon, aluminum, and calcium. The lab studies processes that select mineral phases and decompose and reconstruct them through acid treatment, hydrothermal treatment, and melting treatment, to create materials with various functions.
*Illustrative imageEco-materials using sulfur
Sulfur is an abundant resource in Japan, a volcanic country, and has distinctive properties. Making use of these properties, the lab works on processes that produce high-performance metal adsorbents from biomass waste, and on preparing sulfur cement to solidify soil contaminated with heavy metals.
*Illustrative imageRecycling with molten salts
Organic waste such as plastics and biomass, and organic-inorganic composite materials, require treatment technologies that can render them harmless, recycle them, and even recover valuable materials. The lab aims for a technology that uses reactions in molten alkali hydroxide salts to convert organic matter into hydrogen and recover inorganic matter as resources.
*Illustrative imageEffective use of seawater resources
For Japan, an island nation surrounded by sea, using seawater as a resource is an important challenge. The lab is developing adsorbents that selectively extract valuable and harmful substances from highly saline seawater and brine, and desalination materials that make seawater usable for agriculture.
MembersFaculty
The members of the Wajima Lab consist of faculty, master's students, and undergraduate students.As of 2024
- Associate ProfessorTakaaki Wajima
VoicesStudent voices
Compiled from answers by students who were in the lab. Ratings and reviews reflect individual students' experiences, not the lab's official views.
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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: “Waste hall - in Iru Thermal Power Plant” Lauri Veerde / CC BY-SA 4.0 (cropped)
- Turning waste into functional materials: “Analcime - Kahwan Mountain, Semnan, Iran” Ivar Leidus / CC BY-SA 4.0 (cropped)
- Eco-materials using sulfur: “Sulfur - El Desierto mine, San Pablo de Napa, Daniel Campos Province, Potosí, Bolivia” Ivar Leidus / CC BY-SA 4.0 (cropped)
- Recycling with molten salts: “Carbon fibre weave” Christine Twigg / CC BY-SA 4.0 (cropped)
- Effective use of seawater resources: “Sea salt, evaporation pond Walvis Bay (2014)” Olga Ernst / CC BY-SA 4.0 (cropped)
- Related lab (OGURA Lab
（小倉研究室） ): “Flat-plate solar thermal collector, viewed from roof-level” SolarCoordinates / CC BY-SA 3.0 (cropped) - Related lab (柴研究室): “CdSeNanoplatelets” Kabotin / CC BY-SA 4.0 (cropped)
- Related lab (大川研究室): “MCTC Darkroom ( )” Tony Webster from Portland, Oregon, United States / CC BY 2.0 (cropped)
- Related lab (宮前・亀山研究室): “TiSa crystal” No machine-readable author provided. Mathieu Perrin assumed (based on copyright claims). / CC BY 2.5 (cropped)
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