Home / Information / Laboratories and Academic Staff / Water Quality Engineering

Water Quality Engineering

In our laboratory, we are studying on water pollution mechanisms and fate of pollutants including transportation, transformation, ingestion and concentration mechanisms in water environment, analytical methods for water quality evaluation, management method of water environment, wastewater treatment, and technologies required to prevent the pollution and to recover resources, which are important to conservation and creation of healthy water environment regarding quality, quantity and its filed. These studies are preceded with combination of experiments, on-site surveys, modeling and simulation by computer. Especially, we are focusing on ecological and microbiological transportation and transformation mechanisms, studying on basic analysis of kinetics and modeling, and application to water pollution mechanism analysis and development of conservation and water treatment technologies. We are also focusing on chemical oxidation, studying on basic analysis of kinetics and modeling, application to decomposition of toxic pollutants and disinfecting, and development of conservation and water treatment technologies.

Academic Staff

Fumitake NISHIMURA

Fumitake NISHIMURAAssociate Professor (Graduate School of Engineering)

Research Topics

  • Elucidation of water quality polishment mechanism with biofilm
  • Development of innovatave wastewater treatment technology with ozonation
  • Water environment modeling

Contacts

Room 221 Bidg. C1-2, C cluster, Katsura Campus
TEL: +81-75-383-3349
FAX: +81-75-383-3351
E-mail: nishimura.fumitake.3n@kyoto-u.ac.jp

Taira HIDAKA

Junior Associate Professor (Graduate School of Engineering)

Research Topics

  • Biological waste and wastewater treatment
  • Anaerobic digestion and biomass
    utilization
  • Water quality management in enclosed water body

Contacts

Room 223 Bidg. C1-2, C cluster, Katsura Campus
TEL: +81-75-383-3350
FAX: +81-75-383-3351

Research Topics

Municipal waste and wastewater treatment system technologies

A new system to recover energy and resources from sewage and garbage are under development as a new urban infrastructure of the 21st century for ideal recycling of resources in urban areas. Some elemental technologies are focused on.

Biological filtration
A biological filter has advantages that filtration and biological activities are combined in a single reactor with the aid of media. Advanced, compact, space-saving and cost effective treatment is attainable.

Methane fermentation
Thermophilic (55°C) methane fermentation of garbage is investigated. Possibilities of high fermentation rate and high transformation ratio from garbage to methane gas are expected. Energy such as methane can be collected.

Phosphorus recovery and sludge reduction
Phosphorus, which is to be exhausted within this century, is recovered from sewage by combined technology of biological phosphorus removal, ozonation and crystallization. Amount of excess sludge can be also reduced in this process.

 Image_1e
Figure 1 Resource-recovering system and unit technologies for municipal waste and wastewater treatment

 Chemical oxidation processes (Ozonation and Advanced Oxidation Processes)

For the purpose of disinfection and decomposition of hazardous chemicals, the ozonation and AOPs(Advanced Oxidation Processes) have been developed. Recently, they have been used for water treatment and wastewater treatment to be reused. However, the hazardous by-products are causing concerns in these processes. Therefore, in this research, the ozonation by-products are investigated from various viewpoints as well as optimum operation parameters. 

Image_2e
Figure 2 The relationship between estrogenicity and the amount of ozone consumption per TOC

Evaluation of ozonation by-products using bioassay
Among the ozonation by-products, the focus is on the estrogenic and mutagenic substances. In addition, to evaluate estrogenicity and mutagenicity of these substances, we try to establish bioassay (the biological test methods) and the most efficient and safe system based on the evaluation and control of the by-products.

Investigation of ozonation by-products by chemical analysis
It is important to find the operating factor to satisfy both epidemiological safety and control of ozonation by-products. In this research, the development of chemical analyzing method for unknown by-products and the establishment of optimum condition for the control bromate and organic bromided chemicals, which have a possibility of carcinogenicity and aldehyde, a mutagen, are investigated. 

Water Pollution Mechanisms

Many kinds of pollutants including hazardous substances, which are discharged to environment along with human activity, are transported, transformed and concentrated through food chain and ecosystem in water bodies, and then having adverse effect on the ecosystem seriously. Fate of micro pollutants and elements in ecosystem is investigated.

Lakes and Rivers
Mechanisms of water pollution caused in lakes and rivers are studied by field survey. Detection methods of water qualities by using GC/MS, LC/MS, ICP, ESCA, X-ray FS and ESR are under development. A wide use mathematical model which is applicable to world-wide lakes is also developed.

Bio-monitoring
Bio-monitoring method is under development to discuss the concentration mechanisms of Persistent Organic Pollutants (POPs) in ecosystem by using mussels as an bio-indicator. 

Image_3e
Figure 3 Simulation results of water qualities in a lake

Laboratory Website

https://www.env.t.kyoto-u.ac.jp/en/information/laboratory/water