Air pollution control residues (APCr) from municipal solid waste (MSW) incineration are hazardous waste, and their management requires holistic approaches within technical, economical, legislative, and environmental constraints. This work deals with the recycling of APCr for producing lightweight aggregates (LWA) commonly manufactured by firing natural clay. The main objectives are to evaluate the environmental impacts of LWA with and without incorporating APCr and assess whether APCr recycling in LWA is beneficial, based on the life-cycle assessment (LCA) methodology. The system boundary included raw material extraction, grinding, mixture, firing, cooling, and packing (cradle-to-gate). Results were analysed following the impact assessment methods recommended by the International Reference Life Cycle Data System. Results pointed out a reduction of impacts in all categories when 3% of natural clay are replaced by APCr. The highest gains occurred for toxicity categories (HTc, HTnc) and resulted mainly from avoiding landfill of APCr. For non-toxicity categories, impacts were dominated by the emissions from the kiln firing process, which were similar for both LWA; therefore, impact reductions from APCr use in LWA in these categories were modest. LCA results show that the valorisation of APCr in LWA may be an environmentally sound solution to avoid landfill disposal practices.

来自城市固体废物（MSW）焚烧的空气污染控制残留物（APCr）是危险废物，其管理需要在技术，经济，法律和环境约束下的整体方法。这项工作涉及APCr的循环利用，以生产通常通过烧制天然粘土而生产的轻质骨料（LWA）。主要目标是基于生命周期评估（LCA）方法，评估在不使用APCr的情况下LWA对环境的影响，并评估LWA中的APCr回收是否有益。系统边界包括原料提取，研磨，混合，焙烧，冷却和填充（从摇篮到浇口）。根据国际参考生命周期数据系统推荐的影响评估方法对结果进行了分析。结果指出，用APCr代替3％的天然粘土可减少所有类别的影响。毒性类别（HTc，HTnc）的收益最高，主要是由于避免了填埋APCr。对于无毒类别，影响主要由窑烧制过程的排放引起，这两种LWA相似。因此，在这些类别的LWA中使用APCr减少的影响是适度的。LCA的结果表明，LWA中APCr的增值可能是避免堆填区处置的无害环境解决方案。这两个LWA都相似；因此，在这些类别的LWA中使用APCr所产生的影响减少是适度的。LCA的结果表明，LWA中APCr的增值可能是避免堆填区处置的无害环境解决方案。这两个LWA都相似；因此，在这些类别的LWA中使用APCr减少的影响是适度的。LCA的结果表明，LWA中APCr的增值可能是避免堆填区处置的无害环境解决方案。