Pollution Prevention (Air and Water Environment Conservation)

Basic Concept

To achieve a higher level of environmental conservation, our group is focusing on reducing the emission of pollutants into the air and water environment by proactively incorporating diverse technologies in our business activities such as product research, development, and recycling. In addition, we have established a system to make every employee strongly aware of the necessity of global environmental harmony for business continuity through introductory environmental training at the time of joining the company and regular environmental education. In addition to complying with environmental conservation treaties, laws, and regulations, we are working to prevent abnormalities through standardized actions and the introduction of automated equipment.

Prevention of Air Pollution

Our Group has been striving to prevent air pollution by introducing efficient equipment and fuels, etc. SOx emissions have not only been below the agreed value for the past five years but have also remained at zero. In fiscal 2021, NOx emissions increased from the previous year but remained below the agreed value.

SOx Emissions

NOx Emissions

Preservation of the Water Environment

Our Group filters and circulates industrial water for use to minimize the amount of wastewater discharged without wasting precious water resources. We are also actively working to reduce the environmental impact of domestic wastewater by treating it with bacteria before discharging it.Since there is a risk of oil spillage from the plant into public waters (rivers, etc.), the management of drainage gate had been maintained by human checks, but now we are striving to preserve the water environment by installing oil and pH detectors and introducing automated technology that automatically opens and closes the gates according to the detection status.

<Use of alternative water sources>
We have replaced conventional industrial water sprinkling with rainwater storage water as a measure to prevent dust dispersion during the summer. (Implemented in the summer of FY2022)

(Fiscal year)

Item Agreed value 2018 2019 2020 2021 2022
Water withdrawals, discharges, and consumption Water withdrawals – total volume Freshwater ML/year - 1.46 1.38 1.36 1.46 1.43
Intensity L/t-crude steel production - 2.1 2.3 2.4 2.3 2.2
Water discharges – total volume Total volume ML/year - 0.50 0.48 0.60 0.63 0.58
Water consumption – total volume Freshwater ML/year - 0.96 0.90 0.77 0.83 0.85
Intensity L/t-crude steel production - 1.4 1.5 1.3 1.3 1.3
Water quality Total wastewater volume (m³/day)*1 Usual*2 2,708 1,504 1,395 1,734 2,107 1,617
Maximum*3 3,230 2,245 2,083 2,306 2,735 1,982
Hydrogen ion concentration (pH) Smallest*4 5.8 6.5 6.5 6.6 6.4 7.0
Maximum 8.6 8.0 8.1 8.1 8.5 8.3
Chemical oxygen demand (COD) Concentration Maximum (mg/L) 30 3.3 5.1 3.5 4.2 3.5
Standard (mg/L) 6.6 2.7 2.8 2.3 2.5 2.3
Load carrying capacity Maximum (kg/day) 22 5.7 7.0 6.3 9.6 6.1
Standard (kg/day) 18 4.0 3.7 4.0 5.2 3.7
Biochemical oxygen demand (BOD) Concentration Standard (mg/L) - < 0.5 < 0.5 < 0.5 1.1 1.4
Suspended solids (SS) Concentration Maximum (mg/L) 60 < 1 2 3 2 1
Standard (mg/L) 22 < 1 < 1 1 1 1
Load carrying capacity Maximum (kg/day) 72 2.2 2.1 6.5 4.0 2.0
Standard (kg/day) 60 1.5 1.4 2.5 2.3 1.6
n-Hex Concentration Standard (mg/L) - < 0.5 < 0.5 < 0.5 < 0.5 < 0.5
  • *1 Drainage destination: Nishi Shioiri River; receiving destination: Ibo River (industrial water)
  • *2 Standard: Annual average value per day.
  • *3 Maximum: Maximum value per day throughout the year.
  • *4 Minimum: The minimum value per day throughout the year.

Proper Management of Chemical Substances

The chemical substances released by our Group are properly managed following the Law of Pollutant Release and Transfer Register*1, SDS*2, and other related laws and regulations. In addition to complying with the regulatory values, we are also working to reduce them.

  • *1 PRTR (Pollutant Release and Transfer Register): A system under which the governmental agencies monitor, compile, and announce the number of chemical substances released into the environment and the number of chemical substances contained in wastes and transferred outside of business establishments (transferred amount) based on reports and estimates by business operators. This system has been implemented in the United States, Canada, the Netherlands, the United Kingdom, and other countries.
  • *2 SDS: (Safety Data Sheet) : A safety data sheet containing information on the properties and handling precautions of chemical substances. Based on the legislation in other countries, businesses that handle chemical substances designated by government ordinances are required to provide SDS when conducting business transactions with other businesses.

Amount of PRTR Substances Released and Transferred

PRTR substance number Chemical name Purpose of use Amount handled (kg, ng-TEQ/m³) Emissions to the environment (kg, ng-TEQ/m³) Amount of travel outside the office (kg/year) Chemical Substances Control Law notification or not
Emissions to the atmosphere Discharge into public waters Discharge to the soil at the relevant business site Landfill disposal at the relevant business site Waste Drainage
80 Xylene Paint solvent / Fuel 3,318 3,318 0 0 0 0 0 Yes
87 Chromium and trivalent chromium compounds Reduced slag / Rolling sludge / Casting steel mold 2,895 0 0 0 0 2,895 0 Yes
296 1,2,4-Trimethylbenzene Paint solvent / Fuel 3,323 3,323 0 0 0 0 0 Yes
300 Toluene Paint solvent / Fuel 1,195 1,195 0 0 0 0 0 Yes
412 Manganese and its compounds Reduced slag / Rolling sludge / Casting steel mold 41,979 0 0 0 0 41,979 0 Yes
243 Dioxins Unintentional product 124 124 0 0 0 0 0 Yes

(Note: Unit: kg, ng-TEQ for dioxins)

VOC Emissions

(Note) The above covers volatile organic compounds (VOCs) related to our group among the chemical substances specified in the Order for the PRTR Act as VOCs.