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

• Main Authors: Chien-Chao Huang, 黃建超
• Other Authors: Yun-KungChung
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/68426434340581934998

碩士 === 元智大學 === 工業工程與管理學系 === 100 === 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.