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Size Distribution of Organic Matter and Organic Nitrogen in a Landfill Leachate and Treatment Evaluation

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Two leachates were collected from a landfill before and after on–site biological treatment. Size fractionation and characterization were applied to the leachates. Overall, the organic matter and organic nitrogen in the <3k Da fraction dominate. The treatment efficiency was evaluated by comparing organic matter distribution in raw and treated leachates. Biological treatment was effective in degrading low molecular weight organic matter and organic nitrogen, which has been confirmed by other studies. Organic matter (in terms of TOC and COD) in the >0.45 μm fraction was observed to be removed effectively by biological treatment, but little to no removal was found for organic nitrogen in this fraction. With removal in both the smallest fractions and largest fractions, the organic matter and organic nitrogen in the intermediate size fractions was observed to increase after biological treatment. Both polymerization of the smaller size fraction and partially degradation of both larger and smaller fractions appear to be occurring. Organic nitrogen remained in <1K Da fraction after biological treatment implies a challenge on nitrogen removal.
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Keywords: SBR; andfill leachate; biodegradation; organic compounds; organic nitrogen; size fractionation

Document Type: Research Article

Publication date: 01 January 2011

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