Removal Of Organic And Nitrogen Compounds From Landfill Leachates By Coagulation, Fenton, And Adsorption Coupling Processes

This paper aims at assessing organic matter and nitrogen compounds removal as well as identifying the organic compounds present in the leachate treated by an integrated physico-chemical system (coagulation-Fenton oxidation (FO)-adsorption). The raw and treated leachate were analyzed for the followings parameters: chemical oxygen demand (COD), biochemical oxygen demand (BOD5), and ammonium nitrogen (N-NH4+). The adsorption treatment was based on powdered zeolite 4 A (PZ) and the commercially powdered activated carbon (PAC). The identification of organic compounds using gas chromatography coupled to the mass spectrometry (GC-MS). The raw leachate is characterized by high concentrations of organic load expressed in COD (16,200-26,200 mg O-2 L-1) and a high ammonium nitrogen load (1,623-2,120 mg L-1). The removal of leachate treatment was defined for raw and treated leachate. PZ adsorption removed the highest nitrogen pollutants then PAC adsorption. In the coagulation-FO-PZ adsorption, the removal efficiency reached 93% for N-NH4+, 97% for COD, and 92% for BOD5 and during coagulation-FO-PAC adsorption, the removal efficiency was equal to 59% for N-NH4+, 98% for COD, and 95% for BOD5. GC-MS analysis showed that both integrated systems studied promoted a high reduction of organic compounds from leachate (99%).