Resource Recycling Activities

Environmental Management

Water Risk Management

[Identification of and Response to Water Risks]

In the semiconductor manufacturing industry, which uses a large amount of water, securing and circulating water resources is not only a lifeline for business, but also an important issue that must be addressed as a social responsibility for companies that conduct business activities using natural capital.
ROHM Group is working to reduce water risks (droughts and floods) at all of its 24 sites by using the WRI Aqueduct, a global assessment tool for identifying water risks.
Specifically, four sites were identified as high-risk sites based on the assessment of water stress and water depletion, and river flooding risk and coastal flooding risk.
For drought risk, we have set targets for improving the water recovery and reuse rate and are working to maximize resource recycling through the introduction of wastewater recycling facilities and other measures. For flood risk, the Risk Management/BCM Committee conducts risk assessments and analyses, and from a BCP perspective, we are working to reduce the risk of production stoppages due to flooding by designing BCP inventories based on the expected number of days of stoppages.

[Targets and Achievements]

[Policy for Achieving Environmental Vision]

Work to maximize resource recycling in order to eliminate the waste of limited resources through a series of business activities from development to procurement, production, and sales.

2030 Targets
Improve water recovery and recycling rate by 5.5% or more compared to the FY2019 results by FY2030.
Target for FY2021 FY2021 Actual
Improve water recovery and recycling rate by 0.5% or more compared to the FY2020 results. Improved by 0.84% compared to the FY2020 results.
(Improved by 1.06% compared to the FY2019 results)
Target for FY2022
Improve the water recovery and recycling rate to at least 35%.
(Improve the water recovery and recycling rate by 0.2% or more compared to the FY2019 results)

[Water Withdrawal Over Time]*By Degree of Risk and Type of Water

■Water Withdrawal in FY2021*By Degree of Drought Risk

Water Withdrawal in FY2021*By Degree of Drought Risk
Drought Risk Amount of Water Withdrawal
High 1,183.17
Medium 3,746.304
Low 6,801.349
Total 11,730.823

■Water Withdrawal Over Time *By Type

Inputs Over Time *By Type
  • No date per cassification for FY 2016-2018.

■Wastewater Volume *By Type

Wastewater Volume *By Type

[Efforts to Reduce Water Withdrawal]

・Reduction of Water Withdrawal by Membrane Filtration Recovery of Grinding Wastewater

○Water Withdrawal Reduction Amount: 63,960m3/Year

At ROHM Apollo Chikugo Plant, grinding wastewater discharged from the silicon wafer grinding process (grinding wastewater) is collected by a membrane filtration system and reused as raw water for the pure water production system.
This reuse of water through membrane filtration has reduced water Withdrawal by approximately 3,500 m3/month.
In addition, the plant added a membrane filtration facility to cope with the increase in grinding wastewater due to increased production, resulting in a reduction in water withdrawal of approximately 5,330 m3/month.

  • Schematic Diagram of Membrane Filtration Equipment
  • Schematic Diagram of Membrane Filtration Equipment

Schematic Diagram of Membrane Filtration Equipment

Membrane Filtration Facilities
Membrane Filtration Facilities

・Reduction of Water Withdrawal through Reuse of Wastewater from Production Processes

○Water Withdrawal Reduction Amount: about 4,600m3/Year

ROHM Apollo Hirokawa Head Office Plant installed a wastewater recovery system in 2021. Membrane treatment of wastewater from production processes is performed and reused as raw water for the water supply system, thereby reducing water Withdrawal.

Wastewater Recovery Facilities
Wastewater Recovery Facilities

Waste Management

In order to eliminate waste of limited resources and energy, reduce waste, and recycle resources in a series of business activities from material procurement to development, production, and sales, the Resource Utilization Subcommittee plays a central role in setting up an implementation plan for each fiscal year to achieve the target and promote activities. We continue to achieve zero emissions. To contribute to a sustainable society, we will continue to procure resources with less environmental impact, minimize new resource inputs and waste emissions, and use resources in a sustainable manner.

[Targets and Achievements]

[Policy for Achieving Environmental Vision]

Work to maximize resource recycling in order to eliminate the waste of limited resources through a series of business activities from development to procurement, production, and sales.

2030 Targets
  • ①Maintain zero emission on a domestic consolidated basis, aim for 97% or more recycling rate on an overseas consolidated basis and zero emission on a domestic and overseas consolidated basis by FY2030.
  • ②Reduce waste emissions per unit of production in wafer process plants by 10% or more compared to the FY2019 results by FY2030.
  • ③Reduce waste emissions per unit of production in assembly process plants by 20% or more compared to the FY2019 results by FY2030.
Target for FY2021 FY2021 Actual
①Maintain zero emission on a domestic consolidated basis, aim for 94% or more recycling rate on an overseas consolidated basis and 97% or more recycling rate on a domestic and overseas consolidated basis. 97.9% on a domestic and overseas consolidated
②Maintain FY2020 results for waste emissions per unit of production in wafer process plants. Increased by 7.0%
③Maintain FY2020 results for waste emissions per unit of production in assembly process plants. Maintained FY2020 results
Target for FY2022
  • ①Maintain zero emission on a domestic consolidated basis, aim for 94.5% or more recycling rate on an overseas consolidated basis and 97% or more recycling rate on a domestic and overseas consolidated basis.
  • ②Reduce waste emissions per unit of production in wafer process plants by 8.0% or more compared to the FY2021 results.
  • ③Maintain FY2021 results for waste emissions per unit of production in assembly process plants.

[Waste Emissions]

Waste Emissions

[Efforts to Reduce Waste]

・Switching to Mount-less Label

ROHM Logistec, a logistics base, has switched from paper label rolls used for incoming labels to mount-less label without backing paper, thereby reducing the amount of waste plastic equivalent to the backing paper portion.

  • Switching to Mount-less Label
  • Switching to Mount-less Label

・Installation of Drainage Switchover System

At ROHM Shiga Plant, waste nitric fluoride from metal spin-etching was treated as industrial waste, but by introducing a wastewater switching system, it became possible to treat it in the wastewater treatment facility, thereby reducing the amount of industrial waste generated.

[Hazardous Waste Management Efforts]

The semiconductor manufacturing process generates hazardous wastes such as plastics that are contaminated with chemical substances and chemicals.
ROHM Group has set a target and is working to achieve the goal of utilizing all waste as recycled resources, including hazardous waste that could potentially affect the environment and human health and safety.
As of FY2021, specially controlled industrial waste for the entire ROHM Group accounted for 26.83% of total waste, of which 99.96% was recycled.

[Recycling Efforts]

ROHM Group has set a target of maintaining zero emissions on a consolidated basis in Japan and achieving a recycling rate of at least 97% on an overseas consolidated basis by FY2030, and zero emissions on a consolidated basis in Japan and overseas.

Recycling Efforts
  • RPF(Refuse derived paper and plastics densified Fuel):
    High-grade solid fuel made mainly from recovered paper and waste plastics, which are difficult to recycle as materials, among industrial wastes.

[Voice of the Person in Charge]

As a part of our work related to "resource recycling", which is a key theme of our long-term vision, “The ROHM Group Environmental Vision 2050", we promote waste recycling and company-wide deployment of such measures to reduce resource waste in our production and business activities from the perspective of environmental consideration.

We are also working on internal education programs to raise the awareness of every employee regarding environmental conservation. Specifically, we have established an "Environment Month" within the company, and we conduct e-learning programs on the importance of the circular economy and recycling, and we also provide waste separation manuals and comprehension tests to help employees acquire knowledge and raise environmental awareness.

Corporate Sustainability Division Environmental Management Department Shota Shitomi

Corporate Sustainability Division
Environmental Management Department
Shota Shitomi

Corporate Sustainability Division
Environmental Management Department
Shota Shitomi