COD reduction of BTEX polluted waste water by Advanced Oxidation Process (UV/H2O2

The present work mainly deals with the UV-based advanced oxidation processes (AOPs), UV/H2O2 were tested in batch reactor systems to evaluate the removal efficiencies and optimalconditions for the photodegradation of BTEX in order to wastewater treatment. The efficiency ofthis method was analyzed by evaluating the Chemical Oxygen Demand (COD) as a pollutioncriterion through the COD reactor. The influence of the basic operational parameters such asinitial concentration of H2O2, pH, irradiation time and UV amount on the photo degradation of BTEX were also studied. The oxidation rate of BTEX and respectively the reduction rate of CODwere low when the oxidation was carried out in the absence of H2O2 or UV light. The addition ofproper amount of hydrogen peroxide improved the degradation, while the excess hydrogen peroxide could quench the formation of hydroxyl radicals (•OH). The optimal conditions ofsuspended slurry with 1.11(g/l) initial concentration of H2O2 and pH value of 3.1 were obtained under three UV lights illumination (6 W). Under the optimal conditions, COD reduction during the initial period of 180 min in UV/ H2O2 systems reached about 90%.

کلیدواژه ها:

Chemical oxygen demand ، advanced oxidation processes ، BTEX ، petrochemical wastewater ، photodegradation ، UV/ H2O2