A Study on Rational Water Reuse Rate in High-tech Industry
Date Issued
2010
Date
2010
Author(s)
Lo Chenhsiang, Hsia
Abstract
High-tech industries form an important pillar of economic development in Taiwan. The semiconductor industry considerably relies on water resource because a huge amount of pure water is needed during the manufacturing process. Due to unstable water resources in Taiwan , to ensure enough water to maintain normal production of high-tech industry has become a major challenge. To promote efficient use of water resources in high-tech industry, the Government has set strict standards for water reuse rate. This study shows the rational water reuse rate (RWRR) of assessment model and a reasonable estimate of the value of RWRR in a semiconductor factory. The total cost of water consists of tap water fee, drainage fee, cost of wastewater reclamation and reuse. One of these costs must at least obey the “Law of Increasing Costs”. In this study, the cost of wastewater reclamation and reuse obeys the law that is used as the base to assess the RWRR. When the curve of the total cost vs. the water reuse rate is an U-shaped form, a water reuse rate corresponding to the minimum total cost should be reasonable, and we call it the rational water reuse rate. For example, on a semiconductor manufacturing factory, the RWRR of whole plant is 56.5% and the RWRR of manufacturing process is 75.8% when the tap water unit price is NT$12.9 per cubic meter and drainage unit price is NT$10 per cubic meter. This study shows increasing tap water unit price will lead to the raise in RWRR. For example in a factory , when the RWRR of whole plant is set at 70% , the corresponding tap water unit price is NT$15 per cubc meter, but when the RWRR of whole plant is set at 75%, the corresponding tap water unit price will rise to NT$22 per cubc meter. The results show that the price of the current tap water is quite low for industries in Taiwan, and there is still much room for growth of tap water price raise.
Subjects
High-Tech Industry
Semiconductor Industry
Manufacturing Process Water
Water Reuse Rate
Rational Water Reuse Rate
SDGs
Type
thesis
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