三维电极体系电催化氧化效率的研究

使用三维电极反应器处理不同盐量的草酸模拟废水,以IrO_2-Ta_2O_5/Ti为阳极、5 mm的球状活性炭(granular activatedcarbon,GAC)为填料,在电流密度100 A/m²,极板间距50 mm的条件下,进行电催化氧化过程中化学需氧量(Chemical oxygen demand,COD)、电流效率(Average current efficiency)以及能耗(Energy consumption)的对比,实验结果表明在盐量为0.50%～3.00%的范围内,由于双电层电容的储能作用,提高盐量造成COD去除率有所下降,但能够提高反应末期电流效率,同时由于操作电压的降低可减少反应能耗。通过对比苯酚和草酸的电催化氧化过程证明电催化氧化过程具有较强的氧化有机物的能力。

Efficiency of the Electrocatalytic Oxidation Treating Wastewater by Using Three Dimensional Electrode Reactor

The simulative oxalic acid wastewater with different electrolyte concentrations was treated by a three-dimensional electrode reactor.Experiment was done with IrO_2-Ta_2O_5/Ti as anode and 5 mm size granular activated carbon(GAC) as filling material under operation conditions of constant current density 100 A/m~2 and inter-electrode gap 50 mm,COD removal rate, average current efficiency(ACE) and energy consumption were compared in different conditions.High electrolyte concentrations bring about low COD removal but high ACE and low energy consumption at the end of oxidation due to energy storage of double electric layer capacitor.It was demonstrated that electrocatalytic oxidation process has strong oxidation ability and can treat non -biodegradable organics wastewater with high concentration by comparing the electrocatalytic oxidations between phenol and oxalate.