Removal Of Volatile Organic Compounds With Electrochemical Method

The purpose of this thesis is degradation of VOCs in the air with electrochemical method. With consideration of features of VOCs and physiochemical, electrical character of Activated carbon fiber (ACF), combination of adsorption and electrical catalytical oxidation is put forward for degradation of VOCs. Additionally, a creative reactor has been designed and produced to enhance removal efficiency, as well as mass transfer efficiency.ACF was used as cathode in this study, stainless steel and iron was respectively used as anode. The removal rate of EECA is higher by more than 40% when iron anode was used than that of stainless steel anode due to transformation of H2O2 to Hydroxy radical under catalysis of ferrous ion. Several electrolyte parameters of pH, DO, COD, TC and IC were determined at constant time interval. According to thorough analysis of changing rule of these parameters and relevant references of this field, degradation mechanism was clarified. Removal efficiency of EECA under different conditions of air flow rate, voltage, electrolyte concentration and concentration of initial solution was studied as well as the nature of degradation mechanism.A PC-connected total hydrocarbon analyzer was utilized for real-time monitoring of EECA concentration in the emission air. The data show that the EECA absorbed by solution is much more than that adsorbed by ACF. Monitoring data and calculation result testified the influences of all reacting conditions to removal efficiency.Modeling of EECA removal system was conducted on the basis of scientific theory and experimental data, including EECA volatilization in the initial solution, absorption of EECA in solution and adsorption of EECA by ACF. At last electricity expenditure of this system was calculated.