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Sustainability assessment and prioritisation of bottom ash management in Macao

机译:澳门底灰管理的可持续性评估和优先次序

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摘要

In Macao, about 7200 t yr~(-1) of bottom ash (BA) is generated and conventionally landfilled with construction waste. Because the properties of BA are similar to those of natural aggregates, it is suitable to be recycled as construction material. However, pre-treatment processes for BA reuse may require more resource input and may generate additional environmental impacts. Life cycle assessment, multi-media transport model analysis, cost-benefit analysis and the analytical hierarchy process were conducted to evaluate the impacts of current and potential BA management scenarios regarding environmental, economic, social and regulatory aspects. The five analysed scenarios are as follows: (0) BA buried with construction and demolition waste (current system); (1) pre-treated BA used to replace 25% of the natural aggregate in asphalt concrete; (2) pre-treated BA used to replace 25% of the natural aggregate in cement concrete; (3) pre-treated BA used to replace 25% of cement in cement concrete; and (4) pre-treated BA sent to China, blended with municipal solid waste for landfill. The results reveal the following ranking of the scenarios: 3>2>0>l>4. Scenario 3 shows the best conditions for BA recycling, because the quantity of cement concrete output is the highest and this brings the greatest economic benefits. Our use of integrated analysis provides multi-aspect investigations for BA management systems, particularly in accounting for site-specific characteristics. This approach is suitable for application in other non-western regions.
机译:在澳门,大约产生7200 t yr〜(-1)的底灰(BA),并且通常用建筑垃圾进行填埋。由于BA的性质与天然集料的性质相似,因此适合作为建筑材料进行回收。但是,BA重用的预处理过程可能需要更多的资源投入,并且可能会产生额外的环境影响。进行了生命周期评估,多媒体运输模型分析,成本效益分析和层次分析过程,以评估当前和潜在的BA管理方案对环境,经济,社会和监管方面的影响。分析的五种情况如下:(0)埋有建筑和拆迁废料的BA(现行系统); (1)预处理的BA用于代替沥青混凝土中25%的天然骨料; (2)预处理的BA用于代替水泥混凝土中25%的天然骨料; (3)预处理的BA用于代替水泥混凝土中的25%的水泥; (4)将经过预处理的BA运到中国,与城市固体废物混合后填埋。结果揭示了以下场景排序:3> 2> 0> l> 4。方案3显示了BA回收的最佳条件,因为水泥混凝土的产量最高,带来最大的经济效益。我们对综合分析的使用为BA管理系统提供了多方面的调查,尤其是考虑到了特定地点的特征。这种方法适用于其他非西部地区。

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