焚烧炉渣集料用于道路铺筑的节能减排定量

Energy Saving and Pollution Alleviation by Replacement of Crushed Rock with Municipal Solid Waste Incineration Bottom Ash for Road Construction

以上海浦东国际机场北通道工程的17标K11+203～K11+413试验段为例,在资源、能源消耗以及环境排放方面,从生命周期分析的角度对用垃圾焚烧(MSWI)炉渣替代部分碎石集料铺路和用纯碎石铺路这两种工艺进行了分析比较.结果表明,利用垃圾焚烧炉渣替代碎石铺路可以节约53.9%的石料资源,同时降低约47%的能耗;与能源和资源节约相对应,上述工艺的各种大气污染物以及有机污染物如化学需氧量(COD)、总氮、苯酚类物质等的生命周期排放都较纯碎石集料工艺低42%～50%.但在没有控制措施的条件下以焚烧炉渣替代碎石集料铺路会导致Cd,Cr,Cu,Ni,Pb,Zn等重金属浸出量有一定增加,砷的浸出量降低.

The construction project of section No.17th K11 ＋ 203～K11 ＋ 413,north highway to Shanghai Pudong international airport,where municipal solid waste incineration（MSWI） bottom ash was used as aggregate to replace part of crushed natural rock,was taken as an example for energy saving and pollution alleviation analysis.Life cycle assessment（LCA） was performed for this replacement to evaluate the differences in energy consumption and emissions.The results show that 53.9%of natural rock resource can be saved by using MSWI bottom ash as part of aggregate in road base construction;the energy consumption can be reduced by around 47%compared with road construction with all aggregate materials coming from graded crushed rock.Also the emissions to air and discharge of COD,N-total,oil,and phenol to ground water that are related to energy production consumption are reduced by 42%to 50%.However,recycling MSWI bottom ash as part of aggregate in road construction could lead to an increase in leaching heavy metals of Cd,Cr,Cu,Ni,Pb and Zn,while the leaching of arsenic is reduced.