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Sustainability
Environment
Environmental Data Controlling and Reducing Chemical Substances
To help protect the environment, the OKI Group is active in seeking low environmental-impact chemical alternatives and in reducing chemical consumption.
Achievements in Fiscal 2022
Management of chemical substances used in production activities
As an example of water use at production sites in Japan, water used in production processes is neutralized and detoxified using chemicals before being discharged. Nearly all the chemicals emitted to the atmosphere are volatile organic compounds (VOCs) contained in solvents used for cleaning parts at assembly plants. The OKI Group manages these chemicals as mandated by law, and is active in seeking low environmental-impact chemical alternatives and in reducing chemical consumption.
The Group's emissions rate*1 for FY 2022 was 1.9%.
*1： Emissions rate = Quantity of emissions to atmosphere/water system ÷ Consumption quantity
Amounts of Major PRTR* Chemical Substances Used (FY2022 unit: tons)
| Name of chemical substance | Amount handled | Amount emitted | Amount of movement | |||||
|---|---|---|---|---|---|---|---|---|
| Atmosphere | Public waters | Soil in the workplace | Subtotal | Transfer to sewage system | Taking out of office | Subtotal | ||
| Copper salts (water-soluble, except complex salts) | 392.6 | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 12.9 | 13.0 |
| Peroxodisulfuric acid water-soluble salts | 27.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Antimony and its compounds | 16.5 | 0.0 | 0.0 | 0.0 | 0.0 | 15.6 | 1.0 | 16.5 |
| Formaldehyde | 13.8 | 0.1 | 0.0 | 0.0 | 0.1 | 0.0 | 1.4 | 1.4 |
| Nickel | 12.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 0.9 | 1.7 |
| Toluene | 3.9 | 3.2 | 0.0 | 0.0 | 3.2 | 0.0 | 0.7 | 0.7 |
| Cyclohexylamine | 3.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Xylene | 2.1 | 1.4 | 0.0 | 0.0 | 1.4 | 0.0 | 0.6 | 0.36 |
| Ethylbenzene | 1.6 | 1.1 | 0.0 | 0.0 | 1.1 | 0.0 | 0.5 | 0.5 |
| Methylnaphthalene | 1.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Ethylenediamine | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 1.0 |
| Lead compound | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 |
| Total | 477.0 | 5.8 | 0.1 | 0.0 | 5.9 | 16.4 | 19.1 | 35.6 |
- *Chemical substance discharge grasp management promotion law
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