Water Resource Management


Water Risk Assessment

ASEH collaborated with a team of project consultants to determine the water risks of its facilities worldwide. The Aqueduct risk assessment tool, which is an open-source database developed by the World Resource Institute (WRI), was used to identify the baseline water stress of each facility. In 2019, we performed climate-related water risk analyses on eight main facilities in Taiwan, using data published by Taiwanese authorities as a replacement for data in the original database. Actual management situations within each facility were also considered to bridge the gap in the database. The water risk analysis performed on all our facilities worldwide in 2021 was combined with NASA’s information on climate change to close the gap in domestic and foreign databases. we will develop water risk assessment and analysis tools to manage the water risks of our facilities, determine risks related to local water supply and demand, and analyze the tolerance of key facilities. Where necessary, we will formulate risk adaptation measures based on risk assessment results and improve the resilience of our facilities accordingly to continuously strengthen our ability to arrange backup water supplies and to use water resources more efficiently.


Water Withdrawal and Reuse

ASEH adopts three water use strategies: reduce, reuse, and recycle. The main source of water-use is tap water. Total water withdrawals in 2021 amounted to 25,872,192 tons. Although water withdrawal increased by 4% in comparison with 2020 due to newly added scopes at our subsidiaries and a 23% increase in manufacturing capacity, our water use intensity per unit revenue (including rainwater) decreased by 17% compared to the previous year, reaching our goal of a 67% decrease compared to 2015.

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Wastewater Management

In 2021, 19.569 million tons of effluent was discharged, while the total water consumption was 6.30 million tons. Our effluent management system is more stringent than that stipulated by law, and we regularly / continuously monitor effluent water quality. In addition to internal water quality tests, we also outsource offline sampling and water quality analysis to ensure that the ecology of the aquatic environment is under strict management. Currently, there are 15 facilities that collect and classify process chemicals by channel and treat each independently based on effluent characteristics, increasing the efficiency of effluent treatment processes.