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首页> 外文期刊>American Journal of Environmental Sciences >Long-Term Characterization of Landfill Leachate: Impacts of the Tropical Climate on its Composition
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Long-Term Characterization of Landfill Leachate: Impacts of the Tropical Climate on its Composition

机译：垃圾渗滤液的长期表征：热带气候对其组成的影响

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The disposal of Municipal Solid Waste (MSW) in sanitary landfills produces leachate, whose composition changes depending on the microbial community and the environmental conditions. However, these changes cannot be observed in sanitary landfill because of the superposition of cells, which makes it difficult to determinate the relationship among the phases of biodegradation of MSW, the composition of the leachate and the time required for complete stabilization of the waste. This illustrates the importance of building experimental cells that simulate landfill to monitor the leachate over a long period. This study aimed to analyze the composition of the leachate generated from an experimental cell built on the Delta A sanitary landfill of Campinas City, Brazil, over 945 days. The leachate showed a transition from an acidic anaerobic phase to a methanogenic phase within approximately 100 days. By the one-hundredth day, the leachate showed a characteristically low pH, between 5.0 and 6.0 and a high Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) such as a young leachate with high biodegradability. Moreover, there was an intense leaching of the metals Cd, Fe, Pb and Mn, with concentrations higher than those allowed for the release in water bodies, according to Brazilian law. After the one-hundredth day, the leachate was characterized as stabilized. The pH increased and the concentration of volatile fatty acid, COD and BOD decreased. Co, Zn, Ni and Cu were leached. The potentially toxic metal concentrations found in the leachate also were above the values allowed by Brazilian law.
机译：在卫生垃圾填埋场中处理城市固体废物（MSW）会产生渗滤液，渗滤液的组成会根据微生物群落和环境条件而变化。然而，由于细胞的叠加，在卫生垃圾填埋场中无法观察到这些变化，这使得难以确定城市固体废弃物的生物降解阶段，渗滤液的组成以及废物完全稳定所需的时间之间的关系。这说明了建立模拟垃圾掩埋场以长期监控渗滤液的实验单元的重要性。这项研究旨在分析在945天的时间里，在巴西坎皮纳斯市Delta A卫生垃圾填埋场上建立的一个实验池中产生的渗滤液的组成。渗滤液在大约100天内显示出从酸性厌氧相到产甲烷相的转变。到第一百天时，渗滤液显示出特征性的低pH（介于5.0和6.0之间）以及较高的化学需氧量（COD）和生化需氧量（BOD），例如具有高生物降解性的年轻渗滤液。此外，根据巴西法律，Cd，Fe，Pb和Mn金属的浸出强度很高，其浓度高于允许在水体中释放的浓度。第一百天后，渗滤液被表征为稳定的。 pH升高，挥发性脂肪酸，COD和BOD的浓度降低。浸出了钴，锌，镍和铜。渗滤液中发现的潜在有毒金属浓度也高于巴西法律所允许的值。

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