新型复合滤料对饮用水中溴酸盐的降解效果研究

Study on Bromate Degradation in Drinking Water by New Complex Filter Material

将毫米级Fe-Si颗粒与Mg-Al颗粒混合制成新型复合(Fe-Si)/(Mg-Al)滤料,用于降解饮用水臭氧消毒副产物——溴酸盐。研究发现:在静态试验中,(Fe-Si)/(Mg-Al)复合滤料可以有效地降解溴酸盐,不同体积比的复合滤料降解溴酸盐的反应在动力学上均表现为准一级反应;流动状态下,溴酸盐降解速率受水流速度、滤料厚度、溴酸盐初始浓度的影响。试验结果表明,溴酸盐含量为50～100μg/L的原水以10m/h左右的流速一次性流经VFe-Si∶VMg-Al=1∶1、厚度为30cm左右的滤料(接触时间<2min)后,溴酸盐降解率可达50%以上,且处理出水的色度及金属离子浓度等指标均符合国家饮用水标准。

（Fe-Si）/（Mg-A1） filter material prepared by mixing millimeter grade Fe-Si and Mg-A1 particles was used to degrade bromate, drinking water disinfection by-product. It is observed that in the static experiment, the new complex filter material can remove bromate effectively, and exhibits pseudo-first-order kinetics with respect to the different ratios. In the dynamic flow experiment, the degradation rate of bromate is influenced by the velocity of water flow, the thickness of filter layer and the initial concentration of bromate. The experimental results show that the bromate degradation rate can reach more than 50% within 2 minutes, when the water containing about 50 to 100 μg/L bromate flows through 30 cm VFe-si：VMg-A1 filter layer with ratio of 1 ： 1 and at speed of 10 m/h. The color, metal ion concentration and other indexes of treated water are in line with the national drinking water standard.