| Summary: | 碩士 === 雲林科技大學 === 化學工程與材料工程研究所 === 97 === The prosperity of industries brings harm and damage to the environment due to inappropriate disposal of waste products. As waste water is a significant factor for water pollution, understanding how to manage the elimination of industrial waster water therefore becomes an essential question for study. This research focuses on the elimination of industrial waste water that contains hexavalent chromium, using the electrochemical process tubular reactor. Through establishing a partial differential equation system to simulate the elimination of waster water and using the PFR to electrochemical the hexavalent chromium contaminated wasted water, it allows the electrochemical reaction to transform hexavalent chromium to less poisonous trivalent chromium. The result therefore accords with the Environmental Protection Administration Executive Yuan R.O.C.waste water emission laws and regulations. However, the alteration of the pH levels would affect hexavalent chromium converting into trivalent chromium during this process. Moreover, the level of temperature and the speed of the water current would affect the amount of hexavalent chromium being converted into trivalent chromium. By altering the parameters to influence the system’s responsiveness would make an influence on the effectiveness of the management of industrial waste water.
This research investigated on how altering the flow velocity can affect the pH level within the isothermal system and from this, using the pH level to influence the concentration of the hexavalent chromium. This research also investigated how within the nonisothermal system, through altering different direct currents, can allow the concentration of the hexavalent chromium to influence the system’s temperature. Then combine the result with the autotune variation to achieve the desired setpoint.
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