| Summary: | 碩士 === 弘光科技大學 === 職業安全與防災研究所 === 100 === The main purpose of this study is to develop a novel electrochemical system containing electrocoagulation and electro-Fenton. In the first part, we have developed the electrocoagulation system on treatment of salicylic acid wastewater.
For treatment of salicylic acid, several parameters were evaluated to characterize the salicylic removal efficiency, such as various current densities and temperatures.
The effects of the current density and temperature on the electrical energy consumption were also investigated. The optimum current density and temperature
were found to be 1.2 mA/cm2 and 298 K. Under these conditions, the salicylic acid concentration of aqueous salicylic acid solutions decreased by more than 90 %.
The thermodynamic parameters such as Gibbs free energy, the enthalpy, and the entropy indicated that the adsorption of salicylic acid on metal hydroxides was feasible, spontaneous, and endothermic. The experimental data were also compared to different adsorption isotherm models in order to describe the EC process. The adsorption of salicylic acid was best fitted by the Langmuir
adsorption isotherm model.
In the second part, the development of the Electro-Fenton system have designed to treat salicylic acid wastewater. Cathodically generated hydrogen
peroxide by Electro-Fenton, several parameters were evaluated to characterize the
generated hydrogen peroxide efficiency , such as different cathod, current
densities, pH and oxygen flowing rate. The optimum cathodically, current
density, and oxygen flowing rate were found to be activated carbon fiber, 3.2mA/cm2, pH=3 and 500cm3/min, respectively. In addition, for treatment of salicylic acid by Electro-Fenton , the optimum in Fe2+ and temperature were found to be 0.5mM, and 298K, respectively.
Keywords: Salicylic acid、Electrocoagulation、Specific energy consumption、Adsorption Kinetics、Adsorption isotherms、Electro-Fenton
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