铁锰复合氧化物滤料去除地下水中四环素的效能

以化学挂膜成熟运行5a的铁锰复合氧化物滤料为研究对象，利用静态与连续流柱实验相结合的方式，探究了该滤料去除四环素的效果与机理.结果表明，去除过程符合准二级反应动力学模型；且滤料质量越大，初始浓度越高，对四环素去除的效果越好；当水中共存阳离子浓度为0.01mol/L时，Mg²⁺抑制四环素的去除，而Ca²⁺、K⁺对四环素的去除过程无显著影响.连续流柱实验与发光细菌毒性检测分析，表明，铁锰氧化物滤料对四环素去除效果显著高于石英砂，且铁锰复合氧化物滤料去除四环素后急性毒性降低.此外，机理探究实验结果证实了铁锰复合氧化物滤料去除四环素是吸附与氧化的过程.

Removal of tetracycline in groundwater by iron-manganese co-oxide filter

In this study, the iron-manganese (Fe-Mn) co-oxide filter media were adopted from a pilot-scale water treatment plant. This plant has been running for 5years continuously. Both the static and continuous flow column experiments were conducted to explore the performance and mechanism of tetracycline removal by the Fe-Mn co-oxide filter media. The results indicated that the removal process followed the quasi-secondary reaction kinetics model. The better removal efficiency could be obtained with increasing the material quantity and initial concentration. When the concentration of coexisting cations reached 0.01mol/L, the inhibition of tetracycline removal could be observed. Nevertheless, Ca²⁺、K⁺ exhibited little effect on the tetracycline removal. Through the continuous flow column experiment and the toxicity evaluation based on luminescent bacteria, it indicated that the Fe-Mn co-oxide filter media had higher tetracycline removal efficiency than that of the original quartz sand filter media, and the acute toxicity was reduced after treatment by the Fe-Mn co-oxide filter media. In addition, the experimental results of mechanism exploration confirmed that the removal of tetracycline by the Fe-Mn co-oxide filter media was a combined process of adsorption and oxidation.