Fe/Al_2O_3催化剂催化氧化兰炭废水

Catalytic oxidation of semi-coking wastewater over Fe/Al_2O_3 catalyst

采用浸渍法制备Fe/Al_2O_3催化剂,采用BET、XRD和穆斯堡尔谱等进行结构和性能表征。以自制Fe/Al_2O_3为催化剂,应用催化湿式过氧化氢氧化技术处理COD为6 742 mg·L-1的兰炭废水,通过建立正交实验确定最佳实验条件,结果表明,在p H=4、过氧化氢添加量9.6 m L、反应时间150 min和反应温度80℃条件下,兰炭废水COD去除率达66.30%。对催化氧化后的废水进行GC-MS分析,确定最终氧化产物主要为乙酸。表明自制Fe/Al_2O_3催化剂具有优良的催化效果,并使大分子难降解有机污染物分解为易生化的小分子污染物,甚至被完全分解矿化。

Fe/Al2O3 catalyst was prepared by the impregnation method. The structure and performance of as-prepared catalyst were characterized by Brunauer-Emmett-Teller surface area analyzer （BET） , X-ray diffraction （XRD） and Mossbauer Spectrum techniques. Fe/A1203 catalyst was used to treat the semi-coking wastewater with COD of 6 742 mg·L-1 by the method of catalytic wet hydrogen peroxide oxidation （CWPO）. The best experimental condition was determined by orthogonal experiments. The results showed that COD removal rate of semi-coking wastewater reached 66.30% under the condition as follows： pH =4, hydrogen peroxide dosage 9.6 mL, reaction time 150 min and reaction temperature 80℃. The wastewater after catalytic oxidation was analyzed by using GC-MS, and the final oxidation product determined was mainly acetic acid. The homemade Fe/Al2O3 catalyst had excellent catalytic effect, and the big molecules organic pollutants, which were difficultly biodegraded, could be degraded into small molecules with biodegradability, and even could be completely decomposed and mineralized.