Electron Beam Technology Coupled to Fenton Oxidation for Advanced Treatment of Dyeing Wastewater: from Laboratory to Full Application
Shizong Wang, Jianlong Wang
Abstract
This study developed a novel electron beam (EB) and Fenton process (FP) for the advanced treatment of dyeing wastewater by combining EB radiation with the FP. In the presence of 0.1 mM Fe(II) and 0.1 mM H2O2, the mineralization efficiency of Rhodamine B was 59.21% at a dose of 2 kGy, which is higher than single EB radiation and the FP, due to the interaction of hydrated electron with Fe(II) and H2O2, hydrated electron enhanced the activation of H2O2 and the conversion from Fe(III) to Fe(II) in the EB radiation process. For the actual dyeing wastewater with 255 mg/L COD and 150 times color, the COD decreased to 52 mg/L, and the color decreased to 10 times after EB & FP treatment. In addition, EB & FP was used as an advanced treatment process in practical application to treat the dyeing wastewater from a knitting factory and showed satisfactory performance. The treatment cost of EB & FP was estimated to be 1.5 ¥ per ton wastewater. In summary, EB & FP possesses strong oxidation capacity and low operational cost with the maximum treatment capacity of 5000 m3 per day per electron accelerator, which could provide a solution for the treatment of recalcitrant dyeing wastewater.