Abstract:To study the treatment effect of wastewater containing nitrobenzene explosives with advanced oxidation technologies of ozone, the comparative experimental study on the degradation of nitrobenzene compounds in simulated waste water was carried out by four different combined processes [RPB(rotating packed bed)-O3/H2O2, RPB-O3, BR(bubbling reactor)-O3/H2O2 and BR-O3].Results show that the RPB-O3/H2O2 process shows a strong oxidation capacity to nitrobenzene compounds, the removal rate of nitrobenzene compounds can reach 99%, and wate indicators can meet the discharge standard of nitrobenzene compounds in integrated waste water discharge standard GB8978-1996.Under the same reaction time, the BR-O3/H2O2 and BR-O3 processes show low oxidation capacity to nitrobenzene compounds.In the RPB-O3/H2O2 and RPB-O3 processes, the removal rates of the nitrobenzene compounds enhance with increasing of the high gravity factor and initial pH value.With increasing the H2O2 concentration and liquid flow rate, the removal rate of nitrobenzene compounds first increases and then reduces.Under the experimental conditions of a nitrobenzene liquid flow rate of 120 L·h-1, a H2O2 concentration of 4.9 mmol·L-1, a high gravity factor of 80 and an initial liquid pH value of 10.5, the removal effect of nitrobenzene compounds is good.And the degradation processes of nitrobenzene is in conformity with the pseudo-first-order reaction kinetics.
