Chemical Substances Discharge Control

Comprehensive control of discharge

NSSMC appropriately manages and tries to improve the production, handling, and discharge or disposal of chemical substances in accordance with the PRTR ActAn abbreviated name of the Act on Confirmation, etc., of Release Amounts of Specific Chemical Substances in the Environment and Promotion of Improvements to the Management Thereof. PRTR stands for Pollutant Release and Transfer Register., Chemical Substance Control LawAn abbreviation of the Law Concerning the Examination and Regulation of Manufacture of Chemical Substances., and other laws concerning the management of chemical substances as well as following requirements of relevant management procedures. Under the PRTR Act, we ensure thorough control by checking the material balance including the amount of chemical substances concerned, the amount discharged to the environment, and disposal volume. In a similar manner, we control volatile organic compounds(VOC:Volatile Organic Compounds)Organic chemical compounds emitted into the atmosphere in the form of gases, which are considered to be the source of undesirable airborne particles and photochemical oxidants, which became subject to control under the Air Pollution Control Act of 2004, as amended., which cause photochemical oxidants or airborne particulate matter. Under the Chemical Substance Control Law, we report the amounts of chemical substances manufactured and sold.

NSSMC also took the lead to promote use of alternatives to steelmaking materials and equipment that contain hazardous materials such as asbestos and polychlorinated biphenyl (PCB). We have been replacing or disposing of possibly risky parts and materials, according to safe handling standards.

Discharge control under the PRTR Act

In 1999, before the law took effect, NSSMC started research according to the voluntary control manual prepared by the Japan Iron and Steel Federation (JISF). At present, we monitor 462 substances in accordance with the PRTR Act in an effort to regulate discharges and improve control. The results in FY2015 are as follows: 53 substances were reported; 440 tons were emitted to the atmosphere; and 39 tons were discharged to public water bodies. A total of 7,142 tons of substances were transferred (disposed) outside of the steelworks and factories. The majority of substances were metals such as manganese or chrome and their compounds.

Data are collected at each facility every year. Effective reduction measures are applied at other facilities. Collected data are disclosed on the company’s website.

Similar efforts have been made to reduce VOC. The FY2010 goal of 30% reduction (over FY2000 results) was achieved in FY2009, and the reduction trend continues.

Voluntary prioritized control of chemical substances

No.5 sintering flue gas desulfurization and
denitrification facilities (Wakayama Works)

No.5 sintering flue gas desulfurization and
denitrification facilities
(Wakayama Works)

Benzene, tetrachloroethylene, dichloromethane

NSSMC voluntarily set a hazardous air pollutant reduction plan, with the exception of trichloroethylene, that was used only in small quantities. By implementing the plan, we reached the goals for all three substances and are currently maintaining the reduction levels.


NSSMC has sintering equipment and incinerators that release dioxins into the atmosphere. All of our equipment meets emission concentration standards. As a result of voluntary reduction efforts based on the JISF guidelines, we achieved reduction far exceeding the target of the FY1997 level. Since FY2009, we have maintained low emission levels.

Voluntary Intensive Control of Chemical Substances

Benzene ( t / year)
Tetrachloroethylene ( t / year )
Dioxin ( g-TEQ/year )
VOC ( t / year )

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