Water Resource Management

Management Approach (MA) for Material Topic

I. Source of Water Resources and Water Consumption
Our plants have three types of water sources, specifically third party sources, surface freshwater, and seawater. The wastewater (sludge) discharged after treatment along Taiwan's west coast includes third party terminals and seawater.

II. Water Resource Risk and Impact Assessment
The AWARE method is used for assessing water resource risk and impact assessment. The method assumes decreasing water supply in each area to assess the potential effect of water shortage on human beings or the ecosystem (Boulay et al. 2018). The method divides Taiwan into 23 areas, which are shown in the figure below, in which Yunlin County is not an area with high risk of water shortage (water consumption is lower than the global average 75% of the time). Based on the method proposed by Boulay et al. (2018), we divided Mailiao Plant into the following areas :

III. Water Pollution Prevention and Treatment Guidelines and Wastewater Management

Water resources required for product manufacturing, including ultra-pure industrial water and steam, are mainly used for equipment heating, heat exchange, heat recovery, equipment cooling, power generation facilities, etc., so that raw materials can be used to produce high-quality products based on related manufacturing processes. The Company treats wastewater through our own wastewater treatment facilities. COD discharge per unit of product was 0.0167 kg/ton, and SS discharge per unit of product was 0.0019 kg/ton, stably fluctuating compared with the past few years, showing that biological treatment of wastewater has been mostly stable. However, we will continue to improve the performance of wastewater treatment to ensure compliance with regulatory standards.

IV. 2025 Water Resource Management Results