Efficient Use of Water Resources

Efficient Use of Water Resources

Reduction of Water Consumption in Business Activities

Around the world, there is a growing sense of crisis over water shortages. It is expected that this problem will become more and more urgent as the demand for water rises with population increase and economic growth in developing countries.

The primary businesses of the Sumitomo Forestry Group include the Timber and Building Materials Business and the Housing and Construction Business, which operate on a business model that does not use a high-volume of water. However, our businesses are expanding into sectors that do use water as a valuable resource. Our policy is to reduce the amount of water used with emphasis on these businesses while conducting risk assessments and examining countermeasures for problems that arise.

In addition to manufacturing plants inside and outside Japan, since fiscal 2012, the Sumitomo Forestry Group began examining the consumption of water and the associated sources at bases where actual water usage is measurable, such as at buildings owned by the Sumitomo Forestry Group. We discovered 91.8% of water use is at eight group companies which make up 7.2% of the consolidated net sales by analyzing the water use of all Group companies in fiscal 2016. Therefore, we have positioned these eight companies as important water management companies and conducted risk assessments for water use at five companies in Japan as well as brought together specific measures to address any cases of insufficient water. The Sumitomo Forestry Group has also begun to grasp the actual state of water use even at three overseas companies.

From fiscal 2016 to fiscal 2018, our water consumption increased significantly due to the operation of the Mombetsu Biomass Power Generation Plant and Hachinohe Biomass Power Generation Plant. Biomass power generation leads to increased water usage because power is generated by burning wood and other biomass fuel to boil water and create steam for powering turbines.

The Sumitomo Forestry Group has set conservation and effective utilization of water resources as a target in the Mid-Term Sustainability Targets announced with specific water consumption targets for entire Group for conducting progress management. In fiscal 2021, the entire group used 2,858 thousand m³ of water, which achieved our target of 3,011 thousand m³ or less. Sumitomo Forestry Crest’s Imari Plant, which uses recycled industrial water, has successfully implemented water conservation measures and replaced wastewater treatment equipment, resulting in a constant reduction in water use. We also set a goal of reducing water use in production activities and improved water consumption monitoring and management at the Mombetsu Biomass Power Plant. In comparison to fiscal 2020, the fiscal 2021 data showed a decline of 3.3% (35 thousand m³).

Sumitomo Forestry conducts sample surveys of water used by partner companies at on-site construction of houses in fiscal 2015 to grasp the water consumption in the supply chain, which found the volume of water used per 1 m² of floor area is approximately 0.0887 m³.

Water Consumption over the Past Four Years*

Water Usage over the Past Four Years About symbol for Independent assurance
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Water Consumption per Department*

Office Departments in Japan, etc.
(Unit: 1,000m3)
Plants and Power Generation Business Departments in Japan
(Unit: 1,000m3)
Overseas Plants
(Unit: 1,000m3)
(Unit: 1,000m3)
FY2019 FY2020 FY2021 FY2019 FY2020 FY2021 FY2019 FY2020 FY2021 FY2021
Service water 78 81 87 1,324 1,359 1,337 392 342 340 1,764
Ground water 37 42 52 12 10 8 190 189 238 297
Industrial water 114 120 113 432 419 431 318 288 253 797
Total 230 243 252 1,768 1,788 1,776 900 820 831 2,858

* Covers sites where actual water consumption is measurable, such as at buildings owned by the Sumitomo Forestry Group.

* The aggregation period for water consumption in fiscal 2020 onwards is January to December of each year, and the aggregation period before fiscal 2019 is April of each year to March of the following year.

Efforts in Sumitomo Forestry Crest

The Imari Plant of Sumitomo Forestry Crest, which manufacturers such products as synthetic resin adhesives, uses industrial water to cool its manufacturing equipment. Afterwards, this water is reused to dilute factory wastewater and for other purposes as a water-conservation measure. In addition, from fiscal 2018, wastewater (coagulation sedimentation treated water) is further treated biologically to control the amount of water necessary for dilution for factory wastewater water quality management. This and other new water-saving measures led to an industrial water usage of 65,600m³ in fiscal 2021, a 56% decline compared to fiscal 2018.

Biological processing facility (aeration blower)

Biological processing facility (aeration blower)

Biological processing facility (aeration tank)

Biological processing facility (aeration tank)

Measuring the COD of effluent

Measuring the COD of effluent

Measures Used at the Sumitomo Forestry Crest's Imari Plant for Saving Water

Subjecting waste water (after processing for coagulating sedimentation) to further biological processing*1 makes it possible to restrict the water used for dilution in plant waste water quality management (approximately 350m³/day).
Maintain water-quality control by measuring COD*2 and treat wastewater using only the minimum amount of water necessary.
After water is used to cool manufacturing equipment, it is used to dilute plant waste water.
Improve the proportion of rainwater used, such as by upgrading the pumps used for collecting rainwater.

*1 Beneficial microorganisms are supplied with air (oxygen), whereupon they absorb and break down organic substances, lowering COD values.

*2 Chemical Oxygen Demand (COD): An indication of the amount of oxygen required to oxidize an organic compound in water; one of the most important indicators of water quality.

Participation in Relevant Incentives

The Sumitomo Forestry Group provides answers to the CDP Water Security questions and discloses more detailed information about efforts on risks related to water since fiscal 2017.