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Water Environment Conservation Engineering Lab
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The lab studies the movement of microorganisms and substances in rivers and sewage to protect the water environment.
AboutAbout the lab
Protecting the water of rivers and sewage through analysis.
The Water Environment Conservation Engineering Lab studies how substances and microorganisms move through natural environments such as rivers and soil.
It also works on improving sewage facilities and treatment, and on developing sensors for examining microorganisms in water.
Its research fields are the analysis of water quality and ecological environments, water treatment engineering, and analytical chemistry.
Key terms
- Reclaimed water
- Water that has undergone advanced treatment in addition to ordinary wastewater treatment so that it can be used for purposes such as agricultural water or discharge into rivers.
- Humic substances
- Dark-colored organic matter formed in soil as fallen leaves and the remains of living things decompose.
- Activated sludge
- A muddy mass formed by microorganisms that break down pollutants in sewage. It is widely used in wastewater treatment.
NewsLab news
Assistant Professor Nakaya received an Outstanding Achievement Award at the River Foundation's Fundamental River Research Results Presentation
Doctoral and master's students received The WET Excellent Presentation Award
Professor Satoh and colleagues received the Outstanding Paper Award from the Regional Water Environment Administration Research Committee
A paper from the lab was selected for the cover of the international journal Analytical Sciences
A student received the Lion Award at the annual meeting of the Japan Society on Water Environment
ResearchResearch themes
The lab studies the movement of substances and microorganisms in natural environments, and works on advancing sewage facilities and treatment and on developing sensors. Its research covers microbial contamination of river water, analysis of organic matter in soil, aging sewer pipes, and the properties of activated sludge.
*Illustrative imageWhy E. coli increases in rivers fed by reclaimed water
Reclaimed water, which is sewage given advanced treatment, is used in recreational rivers and similar waterways. Increases in E. coli counts have been observed in rivers carrying reclaimed water, a phenomenon relevant to the health and safety of users, and the lab investigates its causes through experiments.
*Illustrative imageFluorescence analysis of solid samples
Humic substances in soil are usually extracted with an alkaline solution before analysis, but extraction may destroy their original structure. The lab is developing a technique that measures fluorescence from the solid sample as it is, analyzing it without extraction and without damaging it.
*Illustrative imageInvestigating water entering sewer pipes
When rainwater or groundwater enters sewage pipes, it causes problems such as exceeding the treatment capacity of wastewater treatment plants. The lab searches for soil organic matter that enters through cracks in aging sewer pipes, aiming to use it in surveys of pipe deterioration.
*Illustrative imageClarifying the properties of activated sludge
In the activated sludge process, the most widely used method of wastewater treatment, much remains unknown about how bacteria attach to activated sludge flocs. The lab aims to advance water treatment by clarifying the physical and chemical properties of activated sludge.
MembersFaculty
Members of the Water Environment Conservation Engineering Lab include faculty and doctoral, master's, and undergraduate students.As of 2026
- ProfessorHisashi Satoh
- Assistant ProfessorYuki Nakaya
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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: “Activated sludge ( )” SuSanA Secretariat / CC BY 2.0 (cropped)
- Why E. coli increases in rivers fed by reclaimed water: “E coli at 10000x, original” Photo by Eric Erbe, digital colorization by Christopher Pooley, both of USDA, ARS, EMU. / Public domain (cropped)
- Fluorescence analysis of solid samples: “Materia-organica-del-suelo” Edafologia2.0 / CC BY-SA 4.0 (cropped)
- Investigating water entering sewer pipes: “Krah HDPE pipe instalation in Mexico” Tomascastelazo / CC BY-SA 4.0 (cropped)
- Clarifying the properties of activated sludge: “Aeration tank activated sludge process STP Bengaluru India” Vraj Acharya, WELL Labs / CC BY-SA 4.0 (cropped)
- Related lab (Water Quality Conversion Engineering Lab): “Aeration tank activated sludge process STP Bengaluru India” Vraj Acharya, WELL Labs / CC BY-SA 4.0 (cropped)
- Related lab (Environmental Risk Engineering Lab): “Sedimentation Basin” Fmartinezcl / CC BY-SA 4.0 (cropped)
- Related lab (Water Reclamation Engineering Lab): “Cutaway of a microfiltration module with hollow fiber membranes at a NEWater plant” Z22 / CC BY-SA 4.0 (cropped)
- Related lab (Infrastructure Maintenance Systems Engineering Lab): “Taushubetsu-River-Bridge” MaedaAkihiko / CC BY-SA 4.0 (cropped)
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