運用六標準差降低TFT-LCD製程廢水總氮含量之研究

Use Six Sigma Method to reduce nitrogenous compounds in TFT-LCD wastewater

黃建超(Chien-Chao Huang)

指導教授 ： 鍾雲恭

元智大學/工程學院/工業工程與管理學系/碩士(2012年)

摘要

環境保護是現在社會不斷要求與重視的，永續發展更是現代企業的重要使命，TFT-LCD產業因為製程所致，廢水排放量向來在各產業中名列前茅，更因廢水中含氮量過高對人體有害，故其排放標準非常嚴格，所以廢水處理成為該產業需要不斷進行優化的項目。
為了降低廢水中的總氮含量，個案公司在末端廠務處的處理能力已達飽和的狀態下，轉往製程使用端尋求減量。本研究依據六標準差步驟(D-M-A-I-C)逐步分析，並使用特性要因圖找出相關因子後，再利用實驗設計驗證其顯著性。最後找出風幕壓力以及搬送速度兩個主要因子，並找出其最適合水準。利用最適合水準參數全面改善後，可降低總氮含量至100ppm以下。不僅降低廢水總氮含量，也可減少製程中的藥液使用，進而節省生產成本。整體性的提升廢水處理與生產製造兩方面的效益。

關鍵字

六標準差 ； 廢水 ； 總氮 ； TFT-LCD

並列摘要

Environmental protection is a respect in society at time, sustainable development is most important mission in every company. Cause of TFT-LCD product process, the water pollution is always top of each industry, Because the total nitrogen is a toxic substance so it has very stringent emission standards and always keep modify in industry project. On the other hand, the nitrogen is a toxic substance to human, it causes strict emission
In order to reduce total nitrogen in the industry wastewater, we request user to reduce the use of wastewater at ability not enough wastewater treatment facilities in case.
This study employed the DMAIC improvement process of the Six Sigma Approach (D-M-A-I-C). To find root cause by Cause-and-Effect Diagram and use the Design of Experiment (DOE) method verify the significant. And then, finally we find out process parameter of the optimization by two main factors that are air curtain pressure and moving speed. Finally we carry out mass production with the parameter of the optimization, in order to reducing total nitrogen under 100PPM. Not only deduce reducing total nitrogen but also reduce use of the strip that can save cost of production. Integrity totally to improve both of wastewater treatment and manufacture effectiveness.

並列關鍵字

Six sigma ； wastewater ； total nitrogen ； TFT-LCD

參考文獻

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