| Summary: | 碩士 === 國立中央大學 === 環境工程研究所碩士在職專班 === 100 === Great amount of water is used in the washing process in polarized plate industry. The objective of this work is to reduce the water consumption by modifying the washing processes. Three modifications were proposed for the TAC film process. The water consumption and the solution pH and conductivity were recorded to evaluate the effectiveness, the cost, and the flexibility of the modifications. Method 1 recycled the wastewater by the activated carbon tower used in the pure water system, which can recycle 36.3% of the wastewater. However, by doing so, the activated carbon tower cannot treat more raw water. It was also found that the quality of the wastewater in TAC film washing was similar to that of water treated by reverse osmosis (RO). Modification 2 recycled the wastewater from the TA film washing by RO, which can recycle 34.9% water used in this process. Besides, it also reduce the cost for activated carbon tower and ion exchange in water purification. Last, the modification is to reverse the washing process from the less dirty tank to the more dirty tank, which can reduce the water consumption up to 50%. Besides, no capital cost and maintenance fee were required.
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