Water Pollution Prevention and Treatment Guidelines and Wastewater Management

Water resources used in product manufacturing include industrial ultra pure water and steam, which are mainly used for equipment heating, heat exchange, heat recovery, equipment cooling, and power generation facilities, allowing raw materials to be made into high quality products through the manufacturing process. The Company's wastewater is treated by its own wastewater treatment plant.

COD discharge per unit of product was 0.0043 kg/ton and SS discharge per unit of product was 0.0016 kg/ton, stably fluctuating compared with the past few years. This shows that biological treatment of wastewater has been mostly stable, but we will continue to improve the performance of wastewater treatment to ensure compliance with regulatory standards.

The effluent volume generated throughout 2023 was 47,000 tons per day. The quality of water eventually discharged into the Taiwan Strait met effluent standards after wastewater treatment. The volume of wastewater discharged per unit of product in 2023 was 0.00057 million L/ton, showing steady fluctuation. In the future, we will continue to evaluate and develop wastewater recycling and reuse (e.g., collecting process sour water to the FGD system) and wastewater treatment facility modification to increase the volume recycled, in order to continue reducing the wastewater discharge per unit product.