Application of photochemical technologies for treatment of landfill leachate

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• 作者：Daniel E. Meeroff ; ^{dmeeroff@fau.edu} ; Frederick Bloetscher ; D.V. Reddy ; Franç ; ois Gasnier ; Swapnil Jain ; André ; McBarnette ; Hatsuko Hamaguchi
• 关键词：Leachate treatment ; Photocatalytic oxidation ; Titanium dioxide ; Iron mediated aeration
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 March, 2012
• 卷：209-210
• 期：Complete
• 页码：299-307
• 文件大小：441 K

摘要

Because of widely varying practices in solid waste management, an all-inclusive solution to long-term management of landfill leachate is currently not available. There is a major technological need for sustainable, economical options for safe discharge of leachate to the environment. Two potential on-site pretreatment technologies, photochemical iron-mediated aeration (PIMA) and TiO₂ photocatalysis were compared for treatment of landfill leachate at laboratory scale. Results of bench scale testing of real landfill leachate with PIMA and TiO₂ photocatalysis showed up to 86%conversion of refractory COD to complete mineralization, up to 91%removal of lead, up to 71%removal of ammonia without pH adjustment, and up to 90%effective color removal with detention times between 4 and 6 h, in field samples. The estimated contact times for 90%removal of COD, ammonia, lead, and color were found to be on the order of 10-200 h for PIMA and 3-37 h for TiO₂ photocatalysis. Testing with actual leachate samples showed 85%TiO₂ photocatalyst recovery efficiency with no loss in performance after multiple (n > 4 uses). Pre-filtration was not found to be necessary for effective treatment using either process.