Wastewater COD (Chemical Oxygen Demand) concentration control values (Yokkaichi Plant)
Water Risk Management
Water Risk Management Policy
Water resource issues differ according to the region in terms of such things as the balance of supply and demand, the volume of water intake, and water quality. Taking advice from external experts, KIOXIA Group is analyzing water risks that have the potential to materialize up to the year 2040 in each area of our manufacturing operations; this is aimed at ascertaining the risks in terms of the supply-demand balance, natural disasters and other issues applicable to each region, and we are progressing with the implementation of all necessary countermeasures.
Moreover, when water intake occurs from rivers near our manufacturing operations in Japan, we have established voluntary standards that are stricter than those laid down in law, striving to reduce the environmental impact of our wastewater.
Water Management Strategy
At KIOXIA Group, we position initiatives and indices related to water as important management issues. Sustainability strategies and policies, including those related to water, are formulated at Sustainability Strategy Meetings, chaired by the President and CEO, with the degree of target achievement confirmed in each case, before a final review by the Board of Directors.
Sustainability strategies and policies formulated in Sustainability Strategy Meetings, including those related to water, are discussed and KPIs determined by the Sustainability Committee chaired by the Executive Officer in charge of sustainability.
The Environmental Management Review, which involves discussion primarily among Executive Officers, examines social and legislative trends, taking into consideration risks and opportunities related to the use of water, our medium-term environmental plan, the impact on business, and compliance with laws and regulations.
Moreover, as KIOXIA Group’s operations involve the use of large quantities of water, when planning the new establishment of plants, issues for consideration by the Sustainability Strategy Meeting include a Business Continuity Plan envisaging installation of equipment to promote reduction of water volume used and damage caused by flooding or typhoons.
Wastewater Monitoring System
1. Items specified by laws and regulations
In each of its manufacturing operations, KIOXIA deploys automatic analyzers performing around-the-clock monitoring of wastewater and waste gases including nitrogen oxide (NOx), sulfur oxide (SOx), total nitrogen (T-N), total phosphorus (T-P), chemical oxygen demand (COD), suspended solids (SS), fluorine (F), and power of hydrogen (pH). Other items are monitored by sampling.
2. Analysis Center
We analyze approximately 38,000 samples per year at our Analysis Center in Yokkaichi Plant.
In FY2020, we were not subjected to any government fines or penalties in respect of wastewater.
Wastewater voluntary rules
We continuously manage the water and gas discharged by Yokkaichi Plant under our own voluntary guidelines to ensure compliance with the standards specified in all appropriate laws, regulations and agreements.
Evaluating Water Risk
KIOXIA’s manufacturing operations use large quantities of water, so we have commissioned outside experts to evaluate water-related risks from the perspective of current and future water supply and demand risks. The assessment of risks was carried out using tools such as the World Resources Institute’s WRI Aqueduct and the World Wide Fund for Nature’s Water Risk Filter.
The outcome of the assessment of our manufacturing operations was confirmation that they are not exposed to any water risk likely to have practical financial or strategic impact prior to the year 2040. This assessment was based on investigations into such matters as the water supply and demand risk (based on the status of seasonal changes, drought frequency, water storage capacity and water source protection), water disaster risk (such as flooding or landslide sediment damage), and regional vulnerability to water pollution that might endanger public health or ecosystems.
Water-related Targets and Results
KIOXIA has set a target for the reduction of water intake per gigabyte (GB) per unit of capacity using FY2013 as the baseline, and we manage this using a PDCA cycle.
We set a target of 25.5% or lower for FY2020 and achieved this goal with an actual result of 24.8%.
Going forward, we will continue to promote activities aimed at achieving water intake reduction targets, by both reducing water consumption and by promoting recycling.
In order to promote more effective use of resources, KIOXIA is developing initiatives to lower the amount of water received and discharged at its manufacturing plants. One example of this is the collection and reuse inside the plant of water used in the manufacturing process.
Water recycling at domestic manufacturing sites in FY2020 resulted in the collection and reuse of approximately 26 million m3 of water (equivalent to about 53% of all water used), which contributed to effective use of water resources and reduced the environmental impact of public water utility companies.