Daido Steel also places strong emphasis on the effective utilization of water resources. At each of our plants, indirect cooling water for equipment exposed to high temperatures is cooled in permanently installed cooling towers and reused repeatedly. Furthermore, we are making every effort to avoid unnecessary water usage company-wide, including at the head office and regional sales offices.
Preservation of Water Resources and Quality
The following diagram shows the water circulation flow at the Chita Plant.
Each plant within the Chita Plant has set up a cooling water pool and water is reused.
Approximately 5% of total wastewater is treated appropriately in wastewater treatment facilities and then discharged into the sea.
Special Site for Environmental Protection (Water Pollution Prevention)
Data indicating water pollution has been reduced to levels significantly below target values for over 10 years.
For fiscal year 2024, there were no violations of standards or regulations concerning wastewater quality.
![Changes in Concentration of Chemical Oxygen Demand (COD) and Suspended Solids (SS) [Chita Plant]](/en/common/img/pages/sustainability/eco/water/img03.jpg)
![Changes in Concentration of Biochemical Oxygen Demand (BOD) and Suspended Solids (SS) [Hoshizaki Plant]](/en/common/img/pages/sustainability/eco/water/img04.jpg)
Efficient use of Water Resources
A large volume of water is used as a coolant in specialty steel manufacturing processes, which involve the heating of materials to high temperatures. We have long worked to improve water circulation rates, maintaining a target of over 90% circulation rate. We continue to strive to reduce unnecessary wastewater discharge.
Targets for 2030
Maintaining a water circulation rate of over 90%
![[Efficient use of water resources]](/en/common/img/pages/sustainability/eco/water/img02.jpg)
Water-related data by water withdrawal source and release point for wastewater
| Item | FY2022 | FY2023 | FY2024 | |
|---|---|---|---|---|
| Water withdrawal | Total Volume | 2,423 | 2,482 | 2,442 |
| Freshwater(Industrial Water/Water Supply) | 2,361 | 2,372 | 2,368 | |
| Seawater | 0 | 0 | 0 | |
| Groundwater | 62 | 110 | 74 | |
| Other (Reclaimed Water) | 0 | 0 | 0 | |
| Wastewater discharge | Total Volume | 2,545 | 2,586 | 2,580 |
| Rivers (Freshwater) | 1,161 | 1,180 | 1,282 | |
| Groundwater | 0 | 0 | 0 | |
| Sea areas (Seawater) | 1,320 | 1,344 | 1,238 | |
| Water treatment by third party (sewage, etc.) | 64 | 61 | 60 | |
- *1: Figures represent the entire group, including domestic and overseas affiliates (excluding overseas sales offices, etc.)
- *2: Wastewater includes rainwater
- *3: Figures for each item are rounded; therefore, the sum of the breakdowns may not match the total