将物质流法与生命周期评价法相结合, 分析市政污泥焚烧灰渣填埋、灰渣替代黏土和灰渣磷回收与残渣替代黏土 3 种处置场景的环境影响, 并利用成本效益评价法对 3 种处置情景的经济效益进行了比较分析. 结果表明, 灰渣资源化利用在矿产资源耗竭、酸化潜力、富营养化、淡水生态毒性、全球变暖、光化学效应等环境影响类别均优于灰渣填埋处置方式. 灰渣磷回收与残渣替代黏土是最优处置场景, 其净收益为 141.21 元/t 灰渣. 若将该方案推广至我国所有市政污水处理厂, 可提取 26.26 万 t/a 的磷元素, 共产生 209.23 万 t/a 的鸟粪石产品.

The material flow method and life cycle assessment method are combined to analyze the environmental impact of three disposal scenarios, including incinerated sewage sludge ash (ISSA) to landfill, ISSA substitution for clay, phosphorus recovery from ISSA then residue substitution for clay. The cost-benefit method compares the economic benefits of the three disposal scenarios. The results show that ISSA utilization is superior to ISSA to landfill in solving the problems of abiotic resource depletion, acidification potential, eutrophication potential, freshwater aquatic ecotoxicity, global warming potential, photo hem ozone creation potential. In addition, phosphorus recovery from ISSA then residue substitution for clay is the best disposal scenarios with a net income of 141.21 yuan/ton ISSA. If the disposal path is extended to all sewage treatment plants in China, 262,600 tons of phosphorus can be extracted and 2,092,300 tons of struvite can be produced each year.