We have continued to improve the water recycling rate and process water efficiency through technological improvement and investment in equipment as the first semiconductor plant in the park committed to achieving 85% or more of the process water recycling rate, and the process water recycling rate at each plant all reached 85% or more. Since the establishment of the fab, we have upheld an excellent tradition of water conservation. The water-saving work through continuous technological improvements and investment in equipment has become our mission.
We promise that the entire company will use 1,050 CMD of recycled water when the reclaimed water plant is established in the park to respond to the government's policy of promoting the recycling and reuse of reclaimed water proactively. The Company has established a water resource dispatching platform and holds meetings from time to time to discuss the feasible water-saving plans for each plant. When Hsinchu Science Park Bureau announced a water restriction policy, the Company conducted water rationing in according to the directions of the Bureau. According to the plan, it responds to the public and daily using / manufacturing process / maintaining the operation of the cleanroom. Water trucks were contracted for transferring water to the Company at the announced water collection point, to extend the water supply within the plants.
All of the Company's wastewater has to go through the wastewater treatment facilities within the plants, and then flow to the similar facilities at the Park before it is discharged. To monitor the treatment effect for different compositions, the Company distinguishes the wastewater into 20 different types of reusable and non-reusable water treatment based on the type, concentration, and conductivity of the liquid discarded from the processes. In addition to increasing the water reuse rate, recycling some waste liquid acid and organic waste liquid has generated economic values. Single split-flow reduces not only the dosage for chemicals treating the wastewater but also the difficulty for treating the wastewater in the subsequent process, hence alleviating the environmental impact. Since 2015, the Hsinchu Science Park’s management standards have included the ammonia nitrogen indicators. Our P1/2 and P3’s treatment of ammonia nitrogen wastewater through air stripping and catalyst has been awarded the High Distinction Award for Ammonia Nitrogen Wastewater Reduction. We have collaborated with other companies in the same industry in the park to promote this system multiple times in cooperation with the administration and other units and the park. In the 2020 Emerging Wastewater Treatment Technology Seminar held by the Environmental Protection Administration, Executive Yuan, we shared our experience in the treatment of ammonia nitrogen wastewater with the businesses under watch in alignment with the stricter effluent standards under the Water Pollution Control Act in 2021 as a reference for companies in various industries to plan their treatment systems based on their scales.
Reuse and discharge of wastewater
Awarded at the 2020 Emerging Wastewater Treatment Technology Seminar and Innovative Water Technology Exhibition