Degradation of mono ethylene glycol wastewater by different treatment technologies for reduction of COD gas refinery effluent

Ozonation (O3) is a widely used advanced oxidation process (AOP) for the treatment of wastewater, while its drawbacks include high energy consumption and poor solubility must be reduced or eliminated. Hence, combined catalytic ozonation with H2O2 S2O82- was employed to degrade mono ethylene glycol (MEG) eliminate ecological risks during gas refinery wastewater. In this study, reduction chemical oxygen demand (COD) MEG from wastewater by O3, O3/H2O2, O3/Na2 S2O8, O3/GAC, O3/GAC/S2O82- O3/GAC/H2O2 systems were investigated. The optimal conditions obtained as O3 dosage 0.81 g h−1, (0.15 mol L−1), (2 GAC (7 pH 11 60 min reaction time. results revealed that highest rate degradation MEG, COD minimum electrical per order 87.6%, 78.1% 1.01 kWh/m3 respectively 91.0%, 82.5% 0.877 process. constant system about 6.2 times over 5.3 higher than O3. After calculation, synergy factors in O3/GAC H2O2/S2O82- are more 4.7, demonstrating both have strong synergistic effect. finding related OH° trapping agent illustrates indirect plays vital role MEG. performance stability checked resulted also showing good stable activity five consecutive cycles use. pathways proposed based on intermediate analysis. main intermediates found glycolaldehyde, glycolic acid, glyoxal, glyoxylic oxalic acid formic acid. Finally, modification suggested burping phenomenon foaming tendency not observed.