Abstract
The present study investigated the photolytic and photocatalytic treatment of soft drink industry wastewater (SDIW) in presence of microwave (MW) irradiation. The treatment efficiency was investigated in terms of removal rate of chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN) and total phosphate (TP) in microwave photolysis (MWP) system, MW photocatalytic system with one and two electrodeless discharge lamp (EDL), denoted as MWPC-1 and MWPC-2 respectively. The MWPC-2 system showed highest efficiency with a COD, TKN and TP removal rate of 7.48, 82.5 and 0.63 mg/L/min respectively. The COD removal was achieved by direct interaction MW and UV with organics. The photocatalytic oxidation of NH3 to nitrite and nitrate at catalyst surface cause TKN removal from SDIW. On the other hand, major route of TP removal was phosphate reduction occurred in the aqueous phase. On the other hand, the desorption study performed with the catalyst used in the MWPC experiments indicated a TP concentration <2 mg/L and COD and TKN concentrations <5 mg/L indicating the complete removal of organic matter, TKN and TP from aqueous and solid phase during the MWPC process.
Published Version
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