ABSTRACT
Using suspended electrode dielectric barrier discharge (FE-DBD) technology, a low temperature plasma system for the disposal of unsymmetrical dimethyl hydrazine (UDMH) wastewater was designed and built. To study the mechanism and optimization of the system, the discharge gap, pH value of solution and dosage of alkali solution were taken as the influencing factors, while the degradation rates of UDMH and COD were taken as the response values. The relation between each influencing factor and the response values was analysed through response surface methodology. Combined with the central composite design method, the experiment conditions were designed, the quadratic polynomial regression model of response value and influencing factor was established, and the reliability of the model was analysed through variance analysis and experimental verification. Finally, the response surface analysis and system optimization of the response values were carried out, and the optimal operating conditions and degradation rates of UDMH and COD were obtained, which were verified by experiments. The results showed that the optimal operating conditions of the system were as follows: the discharge gap was 2mm, the pH value of the solution was 10, and the dosage of alkali solution was 1.00g/L. Under the conditions above, the actual degradation rates reached 95.00% and 87.40% respectively, which were higher than the predicted values of 88.54% and 82.16%, and the error was 5.99% ~ 6.80%.
