微波诱导Fe_2O_3/沸石负载型催化剂催化氧化焦化废水的研究  

Microwave induced oxidation of coking wastewater with Fe_2O_3/Zeolite as composite catalyst

作　　者：张惠灵[1] 张静[1] 刘海波[1] 杨煊[1] 麻园[1] 汪晶[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《环境污染与防治》2011年第2期69-73,78,共6页Environmental Pollution & Control

摘　　要：以天然沸石为载体,采用尿素均匀沉淀法制备了Fe2O3/沸石负载型催化剂(简称负载催化剂),研究其在微波辐射下对焦化废水的处理效果,探讨了负载催化剂投加量、微波辐射功率、微波辐射时间等因素对处理效果的影响,并考察了负载催化剂的重复使用性能。结果表明,天然沸石、于350℃焙烧得到的负载催化剂和于550℃焙烧得到的负载催化剂对活性嫩黄溶液的色度去除率分别为65.91%、99.52%、51.32%;存在微波诱导时,负载催化剂在酸性或中性偏酸条件下的催化活性较高;当负载催化剂的投加量为0.40 g,微波辐射功率为900 W,微波辐射时间为5 min时,焦化废水的色度、COD去除率分别达82.76%、81.06%,且出水COD降至87 mg/L以下,达到了《钢铁工业水污染物排放标准》(GB 13456—92)的一级排放标准,说明采用微波诱导负载型催化剂催化氧化技术作为焦化废水的深度处理工艺是完全可行的。Fe2O3/zeolite catalyst was prepared by homogeneous precipitation method with natural zeolite as carrier and urea as precipitant.The obtained catalyst was applied for treatment of reactive yellow wastewater under the microwave induction,the effect of catalyst dosage,microwave power,microwave irradiation time on treatment efficiency was investigated,and the regeneration ability of catalyst was also studied.The natural zeolite and Fe2O3/zeolite（modified at 350 ℃ and 550 ℃） all presented certain catalytic capacity in coking wastewater treatment,the corresponding degradation rate of reactive yellow were 65.91%,99.52%,51.32% respectively.The Fe2O3/zeolite achieved high catalytic capacity under the neutral and acidic conditions.Applying 0.40 g of immobilized catalyst for catalytic treatment of coking wastewater under 900 W of microwave irradiation,82.76% of coloration and 81.06% of COD was removal in 5 min of irradiation.The effluent COD decreased below 87 mg/L,which could met the first level discharge standards of GB 13456-92.The results indicated that it was feasible to combine microwave and immobilized catalyst for advanced treatment of coking wastewater.

关 键 词：微波诱导 催化剂 改性沸石 活性嫩黄染料 焦化废水 

分 类 号：X703[环境科学与工程—环境工程]