التفاصيل البيبلوغرافية
| العنوان: |
Effects of landfill age, climate, and size on leachate from urban waste landfills in Portugal: A statistics and machine learning analysis. |
| المؤلفون: |
Martins dos Santos, Joana1 (AUTHOR) jmlms@fct.unl.pt, Amaral, Leonor M.2 (AUTHOR), Martinho, Graça1 (AUTHOR) |
| المصدر: |
Waste Management. Dec2023, Vol. 172, p192-207. 16p. |
| مصطلحات موضوعية: |
*LANDFILLS, *LEACHATE, *MACHINE learning, *POLLUTION, *AMMONIA compounds, *LANDFILL management |
| مصطلحات جغرافية: |
PORTUGAL |
| مستخلص: |
• Effects of age, climate and size were studied in full-scale landfills in Portugal. • Effects of landfill age and size on leachate volume are prevalent over climate. • Ammonia compounds increase with age and size and between wet and dry seasons. • High correlations between macro inorganics and within heavy metals were found. • Two main clusters represent the early and final stages of landfill stabilization. The leachate generated by in urban waste landfills can cause environmental pollution if not controlled and treated. With different proportions of biodegradable waste, urban waste degrades over several phases in anaerobic conditions within a landfill. Using multivariate leachate data from 32 engineered landfills in Portugal, each with a similar waste composition, and all classified as non-hazardous waste landfills receiving urban waste, statistical inference was applied to categorise and deduce significant statistical differences in leachate volume and quality between landfill age, size, and climate, as well as the interactions and effects within these categories. The findings show that the effects of size and age on the leachate volume are prevalent over local, Mediterranean climate conditions; in larger landfills, waste may not be degrading as efficiently as in medium-sized landfills; hotter zones showed higher levels of COD and lower levels of BOD 5 than warmer zones, indicating increased biological activity under higher temperature conditions; TN and NH 4 -N increase significantly with age and size; Cl- also significantly increases with age, showing higher levels, along with SO 4 2-, in hotter zones as well as a concentration effect in the dry season, along with K+; heavy metals maintain levels as landfills age from intermediate to old, with only Cd2+ and Pb2+ showing significant reductions. High correlations between macro inorganics and between heavy metals were found. Cluster analysis showed two main branches, one representing the initial to intermediate stages of anaerobic degradation, and the other the interactions between leaching parameters in the later methanogenic phase of landfill stabilisation. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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