The Journal of

 Background: Advanced oxidation processes such as Fenton and photo-Fenton that have been applied effectively to oxide the persistent organic compounds in leachate and converts them to unharmful materials and final products. However, there are a few data about application of Fenton-like process in leachate treatment. Therefore, the aim of this study was to treat the municipal landfill leachate by above processes..

 Methods: This study was an experimental study that was conducted with set up a pilot system. The used leachate collected from a municipal unsanitary landfill of Qaem-shahr city that located in Mazandaran province. All examinations and samples were analyzed according to Stndard Methods for the Examination of Water and Wastewater.

 Results: The results showed that the conventional coagulation & flocculation process with chloride ferric removed about 45% of COD in optimum conditions. The combining of pretratment with AOPs significantly increased removal efficiency so that the removal efficiency COD for Fenton, photo-Fenton and modified fenton processes was 89, 85.45 and 81.82 percent in the same conditions, respectively. After all processes, the biodegradability (BOD₅/COD ratio) of treated leachate compared to raw leachate was increased and the highest increasing of BOD₅/COD ratio was in the photo-Fenton process.

 Conclusion: The efficiency of the Fenton-like process is less than Fenton and photo-Fenton processes. Instead, the Fenton-like process was done at the higher pH and will not have these problems.