Treatment of landfill leachate waste using sono (US) and photo (UV) based advanced oxidation processes: Studies on various operating parameters

In this study, the treatment of landfill leachate by sono (US) and photo (UV) based advanced oxidation processes (AOPs) was investigated in terms of % color and COD removal, together with electrical energy per order. Experimental results showed that, the hybrid sono–photo–Fenton (US/UV/Fe 2 + /H 2 O 2 ) process has shown that higher removal of color (100%) and COD (96%) with required of low electrical energy per order (0.71 kWh/m 3 ) than the other processes. The influence of various experimental parameters such as H 2 O 2 and Fe 2 + concentration, COD concentration, solution pH, sonication (US) and photo (UV) power on the % color and COD removal with electrical energy per order has been studied to find out the optimum conditions leading to maximum % removal efficiency of hybrid US/UV/Fe 2 + /H 2 O 2 process. The best results of US/UV/Fe 2 + /H 2 O 2 process of landfill leachate have been obtained using 80 mM of H 2 O 2 , 40 mM of Fe 2 + , pH of 3, COD concentration of 2,000 ppm, sonication power of 100 W and UV power of 32 W and after 3 h of reaction time. The synergy index between sonication (US) and photo–Fenton (UV/Fe 2 + /H 2 O 2 ) process has been studied and critically reported. Therefore, the combination of US and UV based AOPs has been proved to be efficient treatment techniques for removal of pollutant from industrial effluent and wastewater.