A Combined Treatment Approach Using Fe0/Air and Fenton’s Reagent for the Treatment of Delay Explosive Wastewater

In order to improve the biodegradability of delay explosive wastewater (DEW), a combined Fe0/air and Fenton oxidation process (i.e., first Fe0/air-Fenton-secondFe0/air) was developed to decompose the refractory organic pollutants and remove heavy metals (i.e., Pb and Cr) in this wastewater. Effect of the initial solution pH, Fe0 dosage, H2O2 dosage, aeration rate, and treatment time on the treatment efficiency of the firstFe0/air-Fenton-secondFe0/air process were investigated, respectively. Meanwhile, two control experiments were setup to confirm the synergistic reaction between Fe0/air and Fenton. The results show that the maximum COD removal efficiency was approximately 50.0% under the optimal conditions. Also, Pb, Cr, and poly(vinyl alcohol) (PVA) in the DEW could be completely removed. Therefore, its BOD5/COD ratio was enhanced from 0.20 to 0.56. Finally, FTIR and EEM fluorescence spectroscopy were used to analyze the decomposition and transformation of the refractory pollutants, which could further c...