A Study on Water Recovery Benefits for IC Packaging and Testing Plants
According to the「Regulations for Implementing Water Conservation Assistant Project in the Science-based Industrial Park」, the recycle rate of waste water in process should exceed 70%, the recycle rate in a plant should exceed 50%, the discharge rate should be less than 80%. An IC packaging and testing plant inside the park is chosen to study its water recoervey benefits. At the present time, the plant has 69% of lthe recycle rate of process, 52.1% of the recycle rate, and 33% of the discharge rate. Obviously, the wastewater recovery system of the target plant does not meet the related stipulation. The purpose of this study is to assess the risk of wastewater recycling, to evaluate the improvement of wastewater recovery, and to reduce the capital expenditure based on the means of water utilization, technical facility performance and operating experience. The results are expected to improve the wastewater recovery rate and reduce the capital expenditure, and in the mean time, meet the requirement of regulation, improve the environmental quality, and achieve the goal of sustainable development. In this study, the possibility of the wastewater recycling and the improvement unit were evaluated in water utilities, such as the hyper-puried waster system, wastewater system, recycling system, and the processing system. During the test run in each system, not only the water gauge was installed and recorded routinely, but the quality of recycled water was also investigated for recovery usage. Finally, the recycling quantity of wastewater, the recovery rate of each system, and the reduction of capital expenditure were evaluated during the full-scale operation. The results indicate that the recovery rate of processing system and whole plant are increased 4% and 7.1%, respectively while the discharging was decreased 2.6%. Thus, the results of the adjusted operation demonstrate that the regulation requirement is met. The capital of total water usage is decreased NT3,472 dollar/day and the wastewater treatment expense is also decreased. This result may therefore be used as a reference for future wastewater recovery in this IC packaging and testing plant.
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