Evaluation of efficiencies of radiolysis, photocatalysis and ozonolysis of modified simulated textile dye waste-water

Abstract

The efficiencies of the advanced oxidation processes (AOPs), viz. electron beam radiolysis in the presence of K₂S₂O₈, gamma radiolysis in the presence of K₂S₂O₈, photocatalysis, photocatalysis in the presence of K₂S₂O₈, photolysis in presence of K₂S₂O₈, ozonolysis and ozonolysis in the presence of K₂S₂O₈, were systematically investigated for the treatment of modified (pH adjusted with H₂SO₄) simulated textile dye waste-water (MSTDWW) containing Reactive Red-120. The efficiencies of these AOPs were investigated in terms of their oxygen-equivalent chemical oxidation capacity, and the cost of energy and other ancillary inputs. The least amount of oxidant was required by electron beam radiolysis compared to the other AOPs studied here, to achieve the same extent of mineralization of MSTDWW. To the best of our knowledge, this study is the first to report an approach to calculate the equivalent cost of gamma radiolysis in comparison to other AOPs consuming electrical energy. Among these AOPs, the electron beam treatment of MSTDWW in the presence of K₂S₂O₈ had the lowest effective cost.