Desulfurization and simultaneous treatment of coke-oven wastewater by pulsed corona discharge

A recent investigation into the application of pulsed corona discharge process, in which simultaneous SO2 removal from simulated flue gas and coke-oven wastewater degradation, was conducted at Wuhan Integrated Steel Plant. The outcome indicates that coke-oven wastewater has good desulfurization ability and pulsed corona discharge enhances the removal efficiency of SO2; up to 85% SO2 is removed from gas through absorption, neutralization and radical reactions. Coke-oven wastewater can also be degraded by pulsed corona discharge, and injection SO2 is helpful to the degradation process; up to 99.98% cyanide and 66.8% phenols can be decomposed and this is of important value in solving the inactivation problem of aerobic bacteria in biological treatment of coke-oven wastewater. The ratio of biochemical oxygen demand content to chemical oxygen demand content increases greatly for the co-effect of SO2 and pulsed corona discharge, which indicates the improvement of complete degradation of coke-oven wastewater by biological treatment. The experimental result suggests the possibility of the simultaneous processing of desulfurization and decontamination of coke-oven wastewater. This research may provide a new technology for desulfurization and coke-oven wastewater treatment in integrated steel plants. [Copyright &y& Elsevier]