液中放电等离子体降解TNT废水的影响因素和能量效率分析

Influence Factors and Energetic Efficiency on Degradation of TNT Wastewater by Electro-hydraulic Discharge Plasma

利用液中放电等离子体技术对TNT模拟废水进行降解研究。结果表明：随着TNT初始浓度的升高，TNT降解率下降，但绝对去除量增加。降低初始pH值和升高温度有利于提高TNT降解率。投加抑制剂Na2CO3后，TNT降解率明显降低。液中放电等离子体降解TNT的反应符合表观一级反应动力学，活化能为14．5kJ／mol．在放电电压36kV、电极间距6mm、水温20℃条件下，初始浓度50mg／L、体积7L的TNT模拟废水经300次放电后降解率达到87％，TNT浓度降低为6．5mg／L；水温升高至50℃后降解率提高到97％，TNT浓度降低为1．5mg／L；能量效率G值为6．56×10^-2～9．33×10^—2mol ecules／heV．

Degradation of TNT wastewater by the electro-hydraulic discharge plasma technique was investigated. The results show that with the improvement of TNT initial concentration, the degradation rate decreases, the absolute degradation quantity increases; the acid condition and the high water temperature promote the improvement of TNT degradation rate; adding Na2CO3 in the electro-hydraulic discharge plasma decreases the degradation rate of TNT obviously; TNT degradation reaction by the electro-hydraulic discharge plasma follows appearance first order kinetics, and the energy of activation is 14.5 kJ/mol; under the condition of discharge voltage 36 kV, electrode-distance 6 mm, water temperature 20 ℃, the TNT initial concentration 50 mg/L, simulated TNT wastewater volume 7 L, after 300 discharges, TNT degradation rate is 87 %, and its concentration decreases to 6.5 mg/L; while the water temperature increases to 50 ℃, TNT degradation rate improves to 97 %, TNT concentration decreases to 1.5 mg/L; the energetic efficiency reaches to 6.56 × 10^-2 - 9.33×10^-2 molecule/heV.