海绵铁还原耦合活性炭吸附-微波再生技术降解甲基橙

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。

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

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 treated 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 radiation 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 microwave regeneration process with the advantages of better treatment, and reuse cycles.