Water is an indispensable component of the Mitsui Chemicals Group’s various chemical product manufacturing processes. For example, water is used in manufacturing processes that include heating, cooling, and washing as well as for equipment that removes harmful chemical substances produced during these processes and discharges effluent.
Formulating its basic philosophy on water resources, the Mitsui Chemicals Group works to manage efficient water usage and water preservation. In addition, we ask suppliers to carry out activities that include waste water management and efficient utilization of water in the Sustainable Procurement Guidelines.

*Please refer here for scope of data.

Basic Philosophy on Water Resources

  • We recognize that water is a finite and precious resource, and regard water conservation as a key priority on a global scale.
  • We make every effort to use water efficiently as we recognize quality water resources are crucial to our operations.
  • We appropriately manage water on a case-by-case basis for each country and region in which we operate, in recognition of the fact that water resources distribution varies both geographically and temporally.

Reduction in water quality contaminants

The Mitsui Chemicals Group has adopted benchmarks on water quality contaminants designated by laws and regulations and monitors the emissions of these substances such as chemical oxygen demand (COD), nitrogen and phosphorus, to preserve the water environment. The emission levels for each of these chemicals are maintained far below the target levels required by laws or other regulations.

In domestic production sites with high water usage, the wastewater from different plants is collected together before it is treated by neutralization, oil separation, and removal of solids. We also pass the wastewater though an activated sludge process to remove organic substances using microorganisms. However, some of the water cannot be treated by the activated sludge process as it contains substances that inhibit microorganisms from organic decomposition or the organic substances contained in the water are persistent. Such wastewater is treated in a normal manner after treated with ozone, combustion, or anammox.*

Anaerobic ammonium oxidation. A process to remove nitrites from ammonium-rich wastewater using ammonia-oxidizing bacteria.

Total Nitrogen Emissions (Mitsui Chemicals, Inc.)

Total Nitrogen Emissions (Mitsui Chemicals, Inc.)

Total Phosphorous Emissions (Mitsui Chemicals, Inc.)

Total Phosphorous Emissions (Mitsui Chemicals, Inc.)

COD, BOD Emissions

COD, BOD Emissions

Efficient Use of Water

The Mitsui Chemicals Group monitors the volumes of water withdrawal, discharge, consumption, and recycling in an effort to use water efficiently. The Group proactively engages in water recycling such as circulating cooling water systems, particularly at production facilities that use large amounts of water.

Volume of Water Withdrawal (tap water, groundwater, industrial water, and seawater)

Volume of Water Withdrawal

Breakdown of Volume of Water Withdrawal (Mitsui Chemicals, Inc.: FY2021)

Breakdown of Volume of Water Withdrawal

Discharge Water Volume

Discharge Water Volume

Water Consumption*

Water Consumption

*Water consumption = water withdrawal - discharge water volume

Water Recycling Volume and Ratio*

Water Recycling Volume and Ratio

*Water recycling ratio = water recycling volume / (volume of water withdrawal + water recycling volume)

Water Risk Assessment

The Mitsui Chemicals Group conducts water risk assessments for its production sites from the present up to the year 2040. To do this, we use the AQUEDUCT Water Risk Atlas of World Resources International (WRI). The Water Risk Filter of the World Wildlife Fund (WWF) has also been added as an evaluation tool from fiscal 2018. Assessment tools have been used to identify regions where water stress is high. Detailed assessments of the unit water levels at production sites, water usage volumes and local data have also been conducted to verify that the water risk at each site is at an acceptable level. In addition, similar surveys are conducted at new plants when operations are commenced.
Including biodiversity risk as a part of water risks, we use IBAT to gather data and investigate biodiversity risk based on the following evaluation items: Protected areas, priority protected areas, endangered species and endangered freshwater species surrounding our production sites.

In support of the TCFD recommendations, we are conducting assessments on the physical risks to our production sites (floods, drought & temperature changes), based on IPCC RCP 2.6 and RCP 8.5. In the future, we will conduct environmental impact assessments to include items with high materiality in the scenario analysis. In identifying sites to be assessed, 47 sites in eight areas that rank high in importance (Japan, China, Southeast Asia, India, United States, Europe, Brazil and Mexico) have been selected for analysis and assessment for the risk of floods, drought and temperature changes. The risk of water-related natural disasters tend to be high for Japan, China, Southeast Asia and India and the number of disasters is expected to increase in many areas. Water supplies tend to be strained in India and Mexico, with a similar trend anticipated for Singapore and Thailand.
Also, we conducted impact assessments for our 13 production sites in Japan and overseas. Utilizing a particular assessment model, we estimated the value of asset losses from river flooding or high tides from 2020 to 2070. The assessment results suggested that in 2030 and onward, the assets in four of our domestic production sites will be subjected to a greater risk impact from river flooding and five sites in Japan and overseas from high tides. We plan to expand the scope of production sites subject to impact assessment, and determine the necessary countermeasures. Based on the assessment results, the approved countermeasures will then be reflected in our business strategies.

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