Pilot Investigation on UV Fenton for Treatment of Landfill Leachate Membrane Concentrate
The landfill leachate membrane concentrate from a landfill site in Shenzhen was treated through a pilot-scale high-power ultraviolet Fenton(HP-UV Fenton)advanced oxidation process,the operation conditions were optimized by means of orthogonal test,and the treatment performance was analyzed.Furthermore,the performances of HP-UV Fenton and low-power ultraviolet Fenton(LP-UV Fenton)for the treatment of landfill leachate membrane concentrate under the same circumstances were compared,with a focus on the removal efficiencies of COD,TOC and TN and the improvement of biodegradability.Excitation-emission-matrix spectra(EEM)and orbitrap mass spectrometry were employed to analyze the dissolved organic matter(DOM)in the effluent from the two treatment systems.Under the same circumstances,the COD removal efficiency of the HP-UV Fenton system attained 83％,which was 13％higher than that of the LP-UV Fenton system.The removal efficiency of TOC amounted to 63％,being 12％higher than that of the LP-UV Fenton system.There was no significant disparity in the TN removal efficiency between the two systems.Regarding biodegradability,the effluent B/C ratio of HP-UV Fenton amounted to 0.25,while that of LP-UV Fenton reached 0.15.The findings of spectrum and mass spectrometry indicated that,in contrast to LP-UV Fenton,HP-UV Fenton had higher removal efficiencies of humic acid and fulvic acid in water and demonstrated a better removal performance for high-oxidation substances in membrane concentrate.The economic analysis indicated that the treatment cost of the concentrate amounted to 58.01 yuan/m3.In conclusion,it is feasible to treat landfill leachate membrane concentrate through the HP-UV Fenton process.
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