Water Risk Analysis
According to the results of the water risk analysis conducted using the Water Risk Filter*, the average score for the total basin risk for all our plants (weighted average taking into account the cement production volume) was 2.6. The highest total basin risk score was 3.5, and the average score was 0.2 lower than that of the previous year. The volume of cement produced at the plant in question accounted for about 13% of the production volume of all the plants. However, when we analyzed conditions at that plant, no urgent issues were identified.
*A water risk mapping tool developed by the World Wide Fund for Nature (WWF). It is used to evaluate business impacts related to water scarcity, flooding, drought, seasonal variation, physical water quality risks, regulatory risks, etc. The maximum score is 5.0, and the higher the score, the greater the risk.
Most of the water used at our cement plants is for the cooling of production equipment, exhaust gas and in-house power generators. Therefore, the water discharged from the plants is mostly cooling water, which is not polluted as defined in the Water Pollution Control Act. Our plants near the ocean use seawater to cool in-house power generation equipment. All the fresh water used at the plants is circulated and reused, except for the household wastewater, as we strive to reduce our water withdrawal and lessen the impact of wastewater on bodies of water.
Our total withdrawal of fresh water in FY2021 was about 27.19 million m3 and our total withdrawal of seawater about 150 million m3. The seawater was used to cool in-house power generation equipment at our plants near the ocean and then released back into the sea after use. The amount of fresh water discharged was approximately 13.45 million m3, meaning that about 13.75 million m3 of fresh water was used at the plants. However, most of this water is not used as a raw material and evaporates after being used to cool equipment or gas.
In FY2021 our fresh water withdrawal to produce 1 tonne of cement was 0.832 m3 (withdrawal per unit of production). There was no great change in our water consumption efficiency.
(Unit: thousand m3)
|Total fresh water withdrawal (I)||26,719||27,596||26,656||27,607||27,192|
|Total seawater withdrawal||146,097||149,056||149,776||147,372||146,232|
|Total water withdrawal||172,816||176,652||176,432||174,979||173,424|
|Total fresh water discharge (O)||12,964||12,294||12,167||13,674||13,447|
|Total seawater discharge||146,097||149,056||149,781||147,377||146,368|
|Total water discharge||159,061||161,350||161,948||161,051||159,815|
|Total fresh water used (I-O)||13,755||15,302||14,489||13,933||13,745|
Reference guidelines: “GCCA Sustainability Guidelines for the monitoring and reporting of water in cement manufacturing Ver. 0.1” GCCA
Appropriate Use of Water Resources
At present there are no specific concerns regarding water resources that may be raised by local communities. However, we are striving to reduce water withdrawal with a view to conserving water resources. In addition, we maintain close communication with local communities and contribute to the appropriate use of local water resources.
Taiheiyo Cement Philippines, Inc. supplies clean water to local communities in the Philippines from wells drilled by the company for water to use in its plants.
CalPortland Company has constructed a system for the sustainable use of water at its Rocky Canyon Aggregate Plant in California, USA. This system has improved the collection and storage of rainwater and spring water at the site. Developing these water resources has made it possible to secure a supply of the water it needs in its work, without having to build new wells or increase the volume of ground water it extracts, and also to keep the amount of water that drains out of the site to a bare minimum. (There are strict regulations with regard to water that drains out of a site.)
System for the sustainable use of water (California)