Initiatives to effectively utilize water resources
The HOYA Group endeavors to effectively utilize water resources by reusing water and reducing water usage on a global scale, in accordance with its Fundamental Environmental Policies.
Water usage reduction targets
The HOYA Group has set numerical targets in each of its business segments and manages its progress in achieving the targets.
Water usage
In fiscal 2020, water usage in the HOYA Group was 15,044,000 cubic meters. Compared to fiscal 2014, we managed to reduce water usage by 13.3% within the Group as a whole, and by 22.3% in terms of water usage per unit of net sales, having raised the ratio of water reuse.
Water usage in the HOYA Group (Thousand cubic meters)
Water usage was calculated targeting production bases, based on the usage of city water, industrial water and groundwater identified by using the data aggregation format shared universally within the HOYA Group.
| Unit | FY2014 | FY2015 | FY2016 | FY2017 | FY2018 | FY2019 | FY2020 | % change from the base year | |
|---|---|---|---|---|---|---|---|---|---|
| Japan | Thousand cubic meters | 1,185 | 1,183 | 1,098 | 1,008 | 1,071 | 929 | 886 | -25.2% |
| Overseas | Thousand cubic meters | 16,169 | 16,336 | 15,871 | 16,360 | 16,357 | 16,848 | 14,158 | -12.4% |
| Total | Thousand cubic meters | 17,354 | 17,519 | 16,969 | 17,368 | 17,429 | 17,777 | 15,044 | -13.3% |
| Water usage per unit of net sales | Thousand cubic meters per billion yen | 35.4 | 34.6 | 35.4 | 32.4 | 30.8 | 30.8 | 27.5 | -22.3% |
| Water reuse ratio | % | 15% | 16% | 18% | 20% | 21% | 27% | 30% | +15% |
Initiatives to reuse water
Initiatives to effectively utilize water resources are being carried out in each business segment. In the photomask manufacturing process, cleaning is performed by using ultrapure water to remove various chemicals and foreign matter. The used water undergoes a process at an effluent treatment facility to be rendered harmless, some of which is subsequently collected and reused. The ultrapure water recycling facility, which consists of adsorbents and reverse osmosis (RO) membranes, makes it possible to reuse water by removing impurities
Recycling of ultrapure water in photomask manufacturing process
