Tokyo PCB Waste Treatment Facility

Tokyo Facility is the third regional PCB waste treatment facility in Japan, thanks to the acceptance of the facility by Tokyo Metropolis and Koto-ku. JESCO started construction in August 2004, and after a test run conducted from June to October 2005, full operations started on November 11, 2005.
The treatment of low PCB concentration insulation oil from pole-mounted transformers stored in Tokyo Metropolis has ended in June 2013 due to completion of treatment.

Outline of Facility


^ Click above to enlarge
  • Location: 3-chome Aomi Chisaki Koutou-ku, Tokyo, 135-0064 JAPAN
  • Lot area: Approx. 30,500 m2

  • Accepted Wastes
  • Type of waste Wastes stored at Wastes accepted outside assigned region
    Transformers and capacitors D Region Some train-mounted transformers stored in C Region, some of large sized transformers stored in E Region
    Ballasts and others D Region (Only some small electrical equipment) Powdered activated carbon waste from Kitakyushu and Osaka Facility
    Note) Each region consist of the following prefectures
    C Region:Gifu, Shizuoka, Aichi and Mie Prefecture
    D Region:Saitama, Chiba, Tokyo and Kanagawa Prefecture
    E Region:Hokkaido, Aomori, Iwate, Miyagi, Akita, Yamagata, Fukushima, Ibaraki, Tochigi, Gunma, Niigata, Toyama, Ishikawa, Fukui, Yamanashi and Nagano Prefecture

  • PCB treatment capacity: 2t/day (PCB decomposition volume)
  • Treatment Method:
    1)Transformers, Capacitors
    Chemical decomposition: Hydrothermal Oxidation Method
    Pre-treatment of containers and components: solvent cleansing
    2)Insulation oil of pole-mounted transformers (stored in Tokyo Metropolis)
    Chemical decomposition: Dechlorination Method
  • Overview of building
    • 5-story steel framed building
    • Building area: 13,000 m2
    • Total floor area: 37,000 m2
    • Height: 40 m


    Treatment Flow

  • High Concentration PCB

  • Transformers and capacitors are inspected at acceptance, and after extraction of PCB oil, parts are disassembled, while ballasts are crushed at once after inspection. The parts are then sent to cleansing and heating facilities. PCB extracted and recovered from various processes are decomposed in the PCB decomposition facilities, using the hydrothermal oxidation decomposition method, where PCB is mixed with sodium hydroxide, water, and oxygen, causing a chemical reaction and PCB is turned into CO2, water and salt. To accelerate reaction, the reaction apparatus is applied pressure of 26.5 MPas, and heated to 370 degrees Celsius. All material are tested if they are PCB free before shipment.
    High Concentration Treatment Flow Diagram
    ^ Click above chart to enlarge

  • Low Concentration PCB

  • Because the PCB concentration of insulation oil in pole-mounted transformers is very low (about 20ppm), they are treated separately from the high-concentrated PCB. Oil extracted from pole-mounted transformers is sent to the decomposition tank facility, which uses the dechlorination method. Inside the decomposition tank, the low concentration PCB oil is mixed with solvents, alkaline chemicals, and blended at 200 degrees Celsius, causing a chemical reaction, turning PCB into a harmless substance called "biphenyl", and "sodium chloride" or common salt. The detoxified insulation oil is used as fuel for boilers at thermal power plants. After PCB is extracted, the containers are sent to a different treatment facility and cleaned, to be recycled as scrap metal.
    Low Concentration Treatment Flow Diagram
    ^ Click above chart to enlarge

    Safety Measures of Tokyo Facility


    Monitoring Operations are monitored 24 hours a day by computers from the Central Monitoring Room.
    Measures for Exhaust Collected air exhaust is cleaned by oil scrubbers in the exhaust treatment apparatus, is treated by activated carbon as a safety net before released.
    Measures to Prevent Leakage To prevent PCB from leaving the facilities, oil pans are set under PCB-handling areas and PCB treatment equipment. Floors are coated with epoxy resin which is impermeable, chemical resistant, and wear-resistant. These measures will prevent PCB from penetrating floors in case of a spilling. The oil pans and floors are equipped with detectors to identify leakage. Furthermore, the air pressure inside the facilities are kept lower than atmosphere outside, to keep air from flowing outside.
    Emergency Measures When an earthquake above preset intensity is detected, facilities are shut down automatically. Also, to protect facilities from fire, automatic fire alarms, chemical fire extinguishers and fire hydrants are installed.

    Information Disclosure of Operation Status

    JESCO makes effort to actively disclose information from planning of facilities to operation status.
    [ To Page Top ]