Combined treatment of the municipal landfill leachate by fluidized bed Fenton process

摘要

Compared to the incineration and composting, landfill was an ordinary technology which is often used in the solid waste disposal. Landfill leachate is highly loaded, toxic, and harmful to the sanitation of wastewater. In past 20 years, technologies such as advanced oxidation processes had been developed for the treatment of wastewater which is contaminated by the hazardous and recalcitrant organic compounds, such as pesticides, surfactants, and pharma-ceuticals and endocrine disrupting chemicals, but so far there is little information about the application of fluidized-beds Fenton process in the oxidation treatment of organic compounds from the municipal landfill leachate. In this paper, the effects of different treatments to the municipal landfill leachate from Shaoxing landfill by gas-liquid fluidized bed with Fenton reagent were examined and evaluated. The effects of various operating conditions, such as treatment time, initial COD strength, initial pH value, initial [H_2O_2], initial [Fe~(2+)], and ventilation volume were examined. After evaluation, several optimal operating conditions (COD = 2500 mg/L, reaction time of 30 min, pH = 2.5, [Fe~(2+)]_0 = 0.05 mmol/L, [H_2O_2]_0 = 0.075 mmol/L, ventilation volume of 0.12 m~3/h, and temperature = 60℃) were found under which the maximum COD removal rate (61.4%) was obtained.