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Environmental Design Engineering

To establish the sound material-cycle society, our laboratory is aiming at developing procedures to analyze, manage, design and control treatment and disposal systems for solid wastes, including recycling and resource recovery, by applying techniques based on disciplines of Transport Phenomena, Environmental Systems Engineering and Environmental Chemical Engineering. By performing fundamental and applied experiments in both laboratory and field scales and using computer analysis and simulation, We approach the following subjects;

  1. Analysis on material and energy flows in urban metabolism systems,
  2. Planning, designing, analysis and control of environmental treatment plants, and
  3. Evaluation and optimization of environmental systems centering human life space.

Academic Staff

Masaki TAKAOKA

Masaki TAKAOKAProfessor (Graduate School of Engineering)

Research Topics

  • Treatment and disposal of solid waste
  • Studies on emission source of trace hazardous heavy metals Control of Persistent organic pollutants (POPs) related with Municipal solid waste incineration (MSWI)
  • Recovery of valuable metals from bottom and fly ash in waste incineration
  • Characterization of solid waste
  • Study on the high efficiency waste power generation

Contacts

Katsura campus, C-cluster, C1-3, Room 463
TEL: +81-75-383-3335
FAX: +81-75-383-3338
E-mail: takaoka@epsehost.env.kyoto-u.ac.jp

Kazuyuki OSHITA

Kazuyuki OSHITAAssociate Professor (Graduate School of Engineering)

Research Topics

  • Development and characterization of advanced sewage treatment system
  • Dewatering and drying of sludge, and remediation of contaminated sediment using liquefied dimethyl ether at normal temperature
  • Study on proceeding of the sewage sludge utilization for energy
  • Separation and recovery of valuable matter from solid waste

Contacts

Katsura campus, C-cluster, C1-3, Room 463
TEL: +81-75-383-3336
FAX: +81-75-383-3338
E-mail: oshita@epsehost.env.kyoto-u.ac.jp

Tadao MIZUNO

Tadao MIZUNOJunior Associate Professor (Graduate School of Engineering)

Research Topics

  • Development of advanced water treatment processes using ozonation/advanced oxidation processes for water purification and reclamation (removal of organic pollutants and micro-pollutants, control of the formation of by-products)
  • Ozone reaction mechanisms and its modeling
  • Water reclamation technologies (ozone, AOPs, membrane)
  • Analysis and control of micro-pollutants

Contacts

Katsura campus, C-cluster, C1-3, Room 462
TEL: +81-75-383-3339
FAX: +81-75-383-3338
E-mail: turbo-mzn@epsehost.env.kyoto-u.ac.jp

Takashi FUJIMORI

Assistant Professor (Graduate School of Engineering)

Research Topics

  • Thermochemical formation/inhibition mechanisms of chlorinated aromatic compounds
  • Sophistication of spectroscopic approach to municipal solid waste
  • Quantitative speciation in case of inorganic/organic analyses
  • Elemental composition and pollution source of environmental multimedia
  • Appropriate treatment of municipal solid waste

Contacts

Katsura campus, C-cluster, C1-3, Room 462
TEL: +81-75-383-3339
FAX: +81-75-383-3338
E-mail: fujimori@epsehost.env.kyoto-u.ac.jp

Taketoshi KUSAKABE

Assistant Professor (Graduate School of Engineering)

Research Topics

Contacts

Research Topics

Characterization of solid waste

To develop new technologies, the detailed characterization of target substances is essential. If chemical state of heavy metal in solid waste becomes clear, we can select the most reasonable treatment or recycling technologies for this solid waste. Because the toxicities of heavy metal are different by the chemical states of the heavy metal, understanding of chemical states of heavy metal in solid waste is very important to evaluate the toxicity and the release of heavy metal to environment.
We proceed now the direct speciation of heavy metal in municipal solid waste incinerator fly ash using X-ray Absorption Fine Structure(XAFS) in the SPring-8, which is the world's largest third-generation synchrotron radiation facility, provides the most powerful synchrotron radiation currently available.

ZnXAFS
Figure 1  XAFS spectrum of zinc compounds in MSWI fly ashes.

Control of micro organic pollutant derived from incineration process

Incineration of solid wastes seems to be one of the major sources of dioxins with serious public concerns. Dioxins are well-known to be the most toxic substances and difficult to be decomposed in natural environment because of their stable properties. The control of in the sources is the most effective and important to reduce the emission of dioxins and related trace organic pollutants to environment.

We have investigated the control of their formation, the inhibition of de novo synthesis, the advancement of flue-gas treatment, their destruction and removal, the environmental behavior and the improvement of their analytical method. In this study, we aim at understanding the formation mechanism and inhibition of de novo synthesis.

Dioxin oxychlorination cycle
Figure 2  Catalytic cycle (oxychlorination cycle) of Cu compounds in MSWI fly ash and formation of CBzs, PCBs and dioxins.

Dewatering and drying of sewage sludge, and remediation of PCB-contaminated sediment using liquefied dimethyl ether at normal temperature

Sewage sludge is generated by treating wastewater in wastewater treatment facilities and categorized as industrial waste in Japan. And sediments are muddy matter at the bottom of river, lake and harbor, and sometimes severely contaminated with dioxins and polychlorinated biphenyls (PCBs). Because both of them are generated in large amounts with human activity, they are necessary to reduce their volume and to remediate certainly and efficiently.

We have been suggested and developed the new dewatering, drying and remediation process of sewage sludge and contaminated sediments using liquefied dimethyl ether (DME) as water and organic pollutants extraction agent. DME is the simplest available ether and is a gas at normal temperature and pressure. Its standard boiling point is –25℃, and it liquefies at six times atmospheric pressure at normal temperatures. Moreover, some water and organic pollutants: dioxins and PCBs, dissolves in DME.

There are three major advantages of this method:

  1. Since it does not use any heat, the energy requirement is almost half that of classical techniques. In addition, no processing of exhaust gases is required.
  2. After dewatering, liquefied DME can be easily evaporated by reducing the pressure, and extracted water, organic pollutant, and dewatered substance can be easily separated.
  3. Gaseous DME can be re-liquefied by compression and reused for dewatering. Therefore, it can be used repeatedly.

DME schematic diagram
Figure 3 Concept of dewatering and remediation process of sludge or contaminated sediment using dimethyl ether (DME).

(A) Mixture of liquefied DME and sludge or contaminated sediment.

(B) Extraction of water (Dewatering and drying).

(C) Separation of water from sludge or contaminated sediment.

(D) Selective evaporation of DME by reducing pressure.

(E) Reuse by pressurization and liquefaction of DME.