颗粒活性炭对水中低浓度过氧化氢的去除效果

Effect of Hydrogen Peroxide Removal in Water by Different GACs Process

紫外-过氧化氢联用(UV/H_(2)O_(2))的高级氧化技术由于其良好的微量有机物污染物去除效果,正逐渐推广应用于供水处理工程的深度处理。然而,该技术使用后一般会产生剩余过氧化氢(H_(2)O_(2)),若不进行有效淬灭会对城市管网和用户健康造成一定影响。颗粒活性炭(GAC)是去除剩余H_(2)O_(2)的一种有效手段,但尚缺乏有效的试验研究和细节探讨。对5种不同性能GAC进行了序批式静态试验,试验结果表明,4种煤质GAC淬灭H_(2)O_(2)符合一级反应动力学模型。进一步探究其吸附动力学和活性炭参数的关系可知,亚甲基兰值、堆重、碘值等参数和反应动力学参数呈一定相关性,但预测能力不佳。另外,动态试验和吸附饱和模拟试验表明,饱和状态下GAC柱对于低浓度(≤4 mg/L)H_(2)O_(2)的去除能力基本不受影响;当浓度较高(>6 mg/L)时,去除能力降低10%~20%。另外,在低浓度淬灭设计工况下,活性炭在深度处理工艺中具有二次利用的可能。

Due to high removal efficiency of micro-organic pollutants in water,UV/H_(2)O_(2) advanced oxidation process(AOP)has been widely used in advanced treatment in water treatment plant(WTP).However,urban water supply network and health of resident may be harmed by the residual hydrogen peroxide,which can be removed by granular active carbon(GAC)as reported.Five types of GACs was used in this experiment.Results of static test showed that reactions by four coal-based GACs accord with first-order reaction kinetics.Common parameters like of GACs which were correlated with the rate constants can’t be applied to predict removal efficiency of hydrogen peroxide.Further,results of dynamic test showed that under the condition of low concentration of H_(2)O_(2)(≤4 mg/L),the removal efficiency of simulated GAC of adsorption saturation were almost unchanged,while 20%~30%fall was observed under the condition of high(>6 mg/L).Furthermore,under the condition of low concentration of H_(2)O_(2),GACs could possibly be reused in BAC process in water treatment plant.