Environmental Protection Activities
ISK practices rigorous management of chemical substances, working to reduce emissions and transfers and to minimize impacts on human life and other ecosystems. Reflecting our commitment to building a sustainable society, we are working to protect the environment and minimize emissions.
*You can see the entire image in the figure by scrolling horizontally.
Release and Transfer of PRTR-Listed Chemical Substances to Environment
The PRTR (Pollutant Release and Transfer Register) is a system under which the government announces, from where, to where and how much chemical substances are released and transferred that may be harmful to human health and ecosystems. It also aims to encourage companies to exercise self-restraint through disclosure.
The graphs show the change in the amounts released and transferred at the Yokkaichi Plant in the past five years.
Reducing Environmental Impact on Atmosphere and Water Areas
The graphs show the amounts of substances, covered by total mass emission control, discharged into the atmosphere and public waters at the Yokkaichi Plant.
The plant has voluntary control standards that are stricter than the total mass emission control values set under Japan’s Air Pollution Control Act and Water Pollution Control Act.
Industrial Waste Disposal
Reduction of By-product Inorganic Sludge
Unnecessary by-product solids (inorganic sludge), generated by each production activity such as titanium dioxide, are properly transported to an industrial waste disposal site. After periodic maintenance of the Yokkaichi Plant in October 2016, we switched to a new method to reduce the generation of the inorganic sludge and it has been decreased.
Controlling Air Radiation Dose Rate of Inorganic Sludge
Ore, used as a raw material for titanium dioxide, contains trace amounts of radioactive impurities such as uranium and thorium, and these are treated and disposed of as waste. Prior to being transferred as industrial waste, radiation levels are measured in accordance with voluntary control standard to ensure that they are safe.
