铁基复合类芬顿催化剂及其在废水深度处理上的应用

THE IRON-BASED FENTON-LIKE CATALYSTS AND THE APPLICATION IN THE WASTEWATER ADVANCED TREATMENT

以活性氧化铝颗粒为载体,负载铁镍双金属,制备铁基复合催化剂,与双氧水(H_(2)O_(2))构成类芬顿体系,以某工业污水处理厂生化出水为处理对象,考察了负载金属比例、焙烧温度等对催化剂活性的影响。结果表明:在n(Fe)∶n(Ni)为1∶1、焙烧温度为500℃条件下制备催化剂,所制得的催化剂对目标废水COD处理效果较好且稳定,COD去除率可达到80%以上,且反应过程中不产生“铁泥”。通过表征分析,催化剂材料中的铁镍主要以其氧化物/氢氧化物的形式存在。连续运行20 d后,本类芬顿体系对实际工业废水COD去除率依然稳定在60%以上,且出水pH在6.5~7.0范围内,无须将废水pH回调,减少了对出水的处理工艺及药剂消耗,节约了污泥处理成本,在废水深度处理领域有一定的应用前景。

The iron-based Fenton-like catalysts was prepared by loading bimetal onto the activated alumina particle to form a Fenton-like system with hydrogen peroxide(H_(2)O_(2)).Wastewater from an industrial sewage treatment plant was chosen as the target pollutant.The effects of the metal ratio and roasting temperature on the activity of the catalyst were investigated.The results showed that the optimum conditions for the preparation of catalyst was as follow,molar ratio of Fe to Ni was 1:1 and roasting temperature was 500℃.The removal rate of COD reached more than 80%stably.The Fe-Ni in catalyst material mainly exists in the form of oxide/hydroxide based on the characterization analysis.The removal rate of COD reached above 60%after running continuously for 20 days,and no mud was produced during the reaction.The pH of effluent ranges from 6.5 to 7.0.Thus,there was no need to adjust the pH after the reaction.The reagent consumption was reduced and the cost of sludge treatment was saved.The method shows a good application prospect in the wastewater advanced treatment.