摘要：In this study, mineralized refuse adsorbent -Fenton-NaClO oxidation were employed to treat biologically stabilized landfill leachate. Firstly, the mineralized refuse after roasting modification was used to absorb Carbon Oxidation Demand (COD) and ammonia nitrogen (NH3-N) in leachate treated by biochemical method, and the mineralized refuse were characterized by Scanning electron microscopy (SEM) and X-ray energy dispersive spectra (EDS) analysis. Response surface methodology (RSM) was applied to evaluate the major factors including the initial pH, reaction time, reaction temperature, H2O2/ Fe2+ molar ratio, concentration of H2O2 and NaClO on the removal of COD and NH3-N in Fenton and NaClO process, and the interactions between these factors, and optimized the operating parameters as well. Under the optimum conditions of Fenton Process such as H2O2 concentration of 72 mmol/L, H2O2/ Fe2+ molar ratio of 3, reaction time of 1.5h and pH of 5 shows 52.68% of COD removal and 38.52% of NH3-N removal. Finally, the removal efficiency of COD and NH3-N reached 81.86% and 98.96% respectively by using NaClO oxidation to further remove them. The results demonstrate that the coupling of mineralized refuse adsorbent-Fenton-NaClO oxidation processes is an alternative method to eliminate the COD and NH3-N from landfill leachate.
