DICEA, Department of Civil, Architectural and Environmental Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
DICEA, Department of Civil, Architectural and Environmental Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
Waste Manag. 2018 Apr;74:302-311. doi: 10.1016/j.wasman.2018.01.017. Epub 2018 Feb 1.
Despite concerted efforts to innovate the solid waste management (SWM) system, land disposal continues to represent the most widely used technology in the treatment of urban solid waste worldwide. On the other hand, landfilling is an unavoidable step in closing the material cycle, since final residues, although minimized, need to be safely disposed of and confined. In recent years, the implementation of more sustainable landfilling aims to achieve the Final Storage Quality conditions as fast as possible. In particular, semi-aerobic landfill appears to represent an effective solution for use in the poorest economies due to lower management costs and shorter aftercare resulting from aerobic stabilisation of the waste. Nevertheless, the implementation of a semi-aerobic landfill in a tropical climate may affect the correct functioning of the plant: a lack of moisture during the dry season and heavy rainfalls during the wet season could negatively affect performance of both the degradation process, and of leachate and biogas management. This paper illustrates the results obtained through the experimentation of a potential dual-step management of semi-aerobic landfilling in a tropical climate in which composting process was reproduced during the dry season and subsequently flushing (high rainfall rate) during the wet period. Eight bioreactors specifically designed: four operated under anaerobic conditions and four under semi-aerobic conditions; half of the reactors were filled with high organic content waste, half with residual waste obtained following enhanced source segregation. The synergic effect of the subsequent phases (composting and flushing) in the semi-aerobic landfill was evaluated on the basis of both types of waste. Biogas production, leachate composition and waste stabilization were analysed during the trial and at the end of each step, and compared in view of the performance of anaerobic reactors. The results obtained underlined the effectiveness of the dual-step management evidencing how wastes reached a higher degree of stabilization and reference FSQ values for leachate were achieved over a one-year simulation period.
尽管人们一直在努力创新固体废物管理（SWM）系统，但土地处置仍然是全球范围内处理城市固体废物最广泛使用的技术。另一方面，填埋是封闭物质循环过程中不可避免的一步，因为尽管将最终残余物最小化，但仍需要安全地处理和封存。近年来，实施更可持续的填埋场旨在尽快达到最终储存质量条件。特别是，半好氧填埋场由于管理成本较低且废物好氧稳定化导致的后期护理时间较短，似乎是最贫穷经济体的有效解决方案。然而，在热带气候下实施半好氧填埋场可能会影响工厂的正常运行：在旱季缺乏水分和雨季降雨量过大可能会对降解过程以及渗滤液和沼气管理的性能产生负面影响。本文介绍了通过在热带气候下进行半好氧填埋场的潜在两步式管理实验所获得的结果，在该实验中，在旱季期间进行了堆肥过程，随后在雨季期间进行了冲洗（高降雨率）。专门设计了八个生物反应器：四个在厌氧条件下运行，四个在半好氧条件下运行；一半的反应器填充了高有机含量废物，另一半填充了经过强化源头分类后获得的残余废物。根据两种废物评估了半好氧填埋场后续阶段（堆肥和冲洗）的协同效应。在试验期间和每个阶段结束时分析了沼气产量、渗滤液成分和废物稳定化情况，并与厌氧反应器的性能进行了比较。所获得的结果强调了两步式管理的有效性，证明了废物达到了更高的稳定程度，并且在一年的模拟期间达到了渗滤液的参考 FSQ 值。
