Synergistic treatment of typical pollutants in waste leachate by microbubbles/UV/H2O2
Taking n-caproic acid,a typical organic pollutant in landfill leachate,as the treatment target,the degradation rule was investigated by using a combined system of MB(microbubbles)and UV(ultraviolet light)with activated H2O2.The effects of various parameters including different treatment methods,microbubble intake,UV lamp power,initial pH,H2O2 volume fraction,and presence of coexisting ions on the chemical oxygen demand COD degradation in simulated waste leachate were meticulously examined.The results show that the synergistic coefficient reaches 31.56 in the MB/UV/H2O2 system,which proves that it has a significant synergistic effect.The system can effectively reduce COD in simulated waste leachate,and the degradation process conforms to single-stage kinetic reaction model.When the reaction time is 180 min,H2O2 volume fraction is 2 x 10 3,pH=4,UV power is 10 W,and MB inlet volume is 30 mL/min,the COD and TOC(total organic carbon)removal rates are 94.54％and 59.10％,respectively.Chloride ions presenting in actual waste leachate diminish the reaction rate in coexisting ion experiments.The results of free radical quenching combined with EPR indicate that the primary generation of hydroxyl radicals and singlet oxygen are mainly produced in MB/UV/H2O2 system.
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