Environmental
Water
Initiatives to effectively utilize water resources
The HOYA Group endeavors to effectively utilize water resources by reusing water and reducing water intake on a global scale, in accordance with its Fundamental Environmental Policies.
Water intake reduction targets
The HOYA Group has set numerical targets in each of its business segments and manages its progress in achieving the targets.
Water intake
The HOYA Group has been promoting initiatives to reuse water in recent years. As we have, our water reuse ratio has been on an uptrend in the past couple of years. We will continue to make effective use of water resources.
Water intake in the HOYA Group (1,000 cubic meters)
Unit |
FY2018 |
FY2019 |
FY2020 |
FY2021 |
FY2022 |
|
|---|---|---|---|---|---|---|
Japan |
Thousand cubic meters |
1,071 |
929 |
886 |
866 |
800 |
Overseas |
Thousand cubic meters |
16,357 |
16,848 |
14,158 |
17,773 |
13,704 |
Total |
Thousand cubic meters |
17,429 |
17,777 |
15,044 |
18,639 |
14,504 |
Water intake |
Thousand cubic meters |
30.8 |
30.8 |
27.5 |
28.2 |
20.0 |
Water reuse |
% |
21% |
27% |
30% |
30% |
31% |
Water intake 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.
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
