HETEROGENEOUS FENTON CATALYTIC OXIDATION TECHNOLOGY FOR LEACHATE TREATMENT IN GENERAL SOLID WASTE LANDFILLS

To address the challenges posed by the complex water quality, high pollutant concentration, and susceptibility to environmental influences in general solid waste landfill leachate, this study developed a combined treatment process based on heterogeneous Fenton catalytic oxidation. Taking a landfill leachate treatment project as an example, the process route "Denitrification Pretreatment - Heterogeneous Fenton Catalysis - Post-treatment System" was employed. Through the synergistic action of units including mechanical bar screening, coagulation sedimentation, air stripping deammonification, activated carbon adsorption, heterogeneous Fenton oxidation, A/O biological treatment, and advanced filtration/disinfection, efficient pollutant removal was achieved. Practical engineering application demonstrated stable system operation. The effluent quality met the discharge standards specified in Table 2 of the "Standard for Pollution Control on Municipal Solid Waste Landfill" (GB16889-2024), with removal rates for COD, BOD?, ammonia nitrogen, total nitrogen, and suspended solids reaching 98%, 98.8%, 99.3%, 99.04%, and 98.6% respectively. The TOC degradation rate exceeded 60%. This process offers both environmental and economic benefits, providing a replicable engineering model for the harmless treatment of landfill leachate.