Water Resource Management
To gain insight into water risks at our facilities worldwide, we implemented the Aqueduct risk assessment tool developed by the World Resource Institute (WRI) to evaluate the baseline water stress level of each facility. As the Aqueduct tool lacks local data from Taiwan, ASEH has commissioned an academic research institution to perform climate risk analyses on eight main facilities in Taiwan by replacing the data in the original database with accurate local data published by Taiwanese authorities and implementing the actual management situations within each facility. Setting 2030 as the target year, we disassembled the physical risks brought on by climate change using the climate adjustment algorithm, and performed calculations on the four hazards of high temperature, low temperature, heavy rainfall and water shortage.
Considerations for continued operations.
Heavy rainfall in the future exceeds the design of the facility – water discharge capabilities should be enhanced.
Extreme high temperature occur approximately 8.6~16.5 days every year; extreme low temperature occur approximately 1.6~8.3 days every year. Relevant operations, logistics, outdoor procedures, and other arrangements should all beware of the effects of extreme temperature.
Manifested by changes in rainfall, future drought seasons (November to the following May) will experience an average of 8~20% less rainfall, with the drought standard deviation also decreasing by 1~37%. There is a high chance that future rainfall will ‘decrease steadily’, thus, we should continue to increase efficiency of water resources and search for a replaceable, alternative water source, water storage and water recycling system.
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 2020 amounted to 24,959,219 tons, while water withdrawal increased by 3% compared to the previous year due to newly added scopes and a 20% increase in manufacturing capacity. However, water use intensity per unit revenue (including rainwater) decreased by 16% compared to the previous year, reaching our goal of a 30% decrease compared to 2015.
In 2020, 19.45 million tons of effluent was discharged, while the total water consumption was 5.51 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.