The Study On The Preparation Of The Electrode With Higher Oxygen Evolution Potential And Electrochemical Treatment Of RDX Wastewater

At present, it has been the difficult and focus of the waste water treatment for the disposal of toxic and biorefractory organics that can't be treated effectively by the current ordinary waste water treatment technology. All the organic in the waste water do great harm to the human and natural environment. The electrochemical oxiadation processes has attracted a great deal of attention because of its ease of operation, environmental compatibility and versatility. The aim of the work was to investigate the electrochemical oxidation degradation mechanisms, anode materials and the practical problems of electrochemical treatment of RDX wastewater.The TiO2-NTs/SnO2-Sb have been prepared by anodization, electrodeposition and annealing. In contrast with the traditional Ti/SnO2-Sb electrode prepared by thermal decomposition, TiO2-NTs/SnO2-Sb electrode has higher oxygen evolution over-potential. Accelerated service life tests show that the electrochemical stability of TiO2-NTs/SnO2-Sb electrode is greatly enhanced compared to Ti/SnO2-Sb electrode. TiO2-NTs/SnO2-Sb electrode is the present most promising anode material for electrochemical wastewater treatment.It has been demonstrated that TiC2-NTs/SnO2-Sb anode is more better than Ti/SnO2-Sb anode for electrochemical treatment of RDX. The initial concentration, the pH value of the solution and the current density on the electrochemical oxidizability of wastewater were discussed. The reaction of electrochemical degradation of RDX follows a pseudo-first-order kinetics.According to the real project, RDX wastewater was treated by the combined process of electrochemical reaction and A/O bioreactor. The optimal parameter was obtained:current density is 20mA·cm-2, pH is 5 and the flow rate is 10mL/min. Stable A/O process performance was developed during running continuously for five phase. The removal rates of RDX, COD, NH4+-N and NO3--N are 99.9%,97.1%,90%and 88.2%. This combined process of electrochemical reaction and A/O bioreactor is highly practicable.