海绵铁还原耦合活性炭吸附-微波再生技术降解甲基橙  

Degradation of methyl orange by sponge iron reduction coupled with GAC adsorption and microwave regeneration

作　　者：王晓燕[1,2] 许振成[2] 刘芸[2] 鞠勇明[2] 任学昌[1] 庞志华[2] 郝火凡[1] 方建德[2] 

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]环境保护部华南环境科学研究所,广州510655

出　　处：《环境工程学报》2013年第6期2093-2099,共7页Chinese Journal of Environmental Engineering

基　　金：国家"十二五"科技支撑计划项目(2012BAJ21B07)

摘　　要：采用海绵铁(s-Fe0)还原耦合活性炭(GAC)吸附-微波(MW)再生技术降解甲基橙(MO)溶液,重点考察了s-Fe0投加量、粒径、微波功率等因素对MO去除效果的影响。结果表明,s-Fe0投加剂量为15.0 g/L、粒径为3～5 mm、超声波功率为200 W,反应1 h,MO的去除率为94.2%。其次,采用GAC吸附-MW再生技术(800 W,照射1 min)循环处理上述脱色后的MO废水。结果表明,GAC吸附可有效降低废水的生物毒性及残留的染料、TOC和总铁离子浓度,且MW辐射可有效再生吸附饱和的GAC颗粒。因此,s-Fe0还原耦合GAC吸附-MW再生技术可以有效降解MO染料,具有处理效果好、实现资源循环利用等优点。In this study, we attempted to eliminate methyl orange （MO） in aqueous solution by magnetic sponge iron （s-Fe0） reduction combined with granular activated carbon （GAC） adsorption and microwave （MW） regeneration process, and investigated the effects of s-Fe0 dosage, particle size, ultrasonic power on the elimination process. The results showed that the decolorization rate of MO was 92.4% after 1 h treatment with the s-Fe0 particle size of 3 - 5 mm, the dosage of 1.5 g, and the ultrasonic power of 200 W. Moreover, the trea- ted solution was further treated by GAC adsorption coupled with MW-based regeneration （800 W, 1 min）. The results indicated that the GAC-based adsorption successfully eliminated biotoxicity and total organic carbon （TOC） and total iron ion concentration, as well as the residue MO of the treated solution. Furthermore, MW ra- diation could effectively regenerate the spent GAC basically maintaining the BET area, pore volume and pore size of GAC. Accordingly, it was feasible to reduce MO solution over s-Fe0 combined＇ with GAC adsorption and mi- crowave regeneration process with the advantages of better treatment, and reuse cycles.

关 键 词：海绵铁 活性炭 微波再生 生物毒性 

分 类 号：X703.1[环境科学与工程—环境工程]