High-gravity intensified iron-carbon micro-electrolysis for degradation of dinitrotoluene

The application of iron—carbon (Fe—C) micro-electrolysis to wastewater treatment is limited by the passivation potential of the Fe—C packing. In order to address this problem, high-gravity intensified Fe—C micro-electrolysis was proposed in this study for degradation of dinitrotoluene wastewater in a rotating packed bed (RPB) using commercial Fe—C particles as the packing. The effects of reaction time, high-gravity factor, liquid flow rate and initial solution pH were investigated. The degradation intermediates were determined by gas chromatography-mass spectrometry, and the possible degradation pathways of nitro compounds by Fe—C micro-electrolysis in RPB were also proposed. It is found that under optimal conditions, the removal rate of nitro compounds reaches 68.4% at 100 min. The removal rate is maintained at approximately 68% after 4 cycles in RPB, but it is decreased substantially from 57.9% to 36.8% in a stirred tank reactor. This is because RPB can increase the specific surface area and the renewal of the liquid—solid interface, and as a result the degradation efficiency of Fe—C micro-electrolysis is improved and the active sites on the Fe—C surface can be regenerated for continuous use. In conclusion, high-gravity intensified Fe—C micro-electrolysis can weaken the passivation of Fe—C particles and extend their service life.