The handling of sewage sludge (SS) and urban plant litter (UPL) has become an important concern. Immobilizing heavy metals (HMs) is regarded as a necessary process for recycling SS in agriculture and forestry. Here, HM removal and HM phytotoxicity in SS during vermicomposting with different additive UPLs was investigated. The results show that vermicomposting with additive UPL significantly reduced the content of HMs, and increased organic carbon content and the proportion of macroaggregates in SS. This process also significantly immobilized HMs by mainly transforming extractable and reducible HMs into residual products. The litters of Dracontomelon duperreanum and Bauhinia purpurea increased oxidizable HMs in SS and the accumulation capacity of HMs of earthworms during vermicomposting. The Cd content in vermicomposts with the B. purpurea litter addition was decreased by 31% relative to the initial SS. Maize in vermicomposts with UPL additions, especially with B. purpurea litter, exhibited significan5tly higher seed germination rates, seedling biomass, root activity, and a lower accumulation of HMs than in SS compost without UPL additions. These results suggest that vermicomposting with additive UPL can alleviate the phytotoxicity of HMs in SS and provides a new method for simultaneously recycling SS and UPL.

污水污泥（SS）和城市植物垃圾（UPL）的处理已成为一个重要问题。固定重金属（HMs）被认为是在农业和林业中回收SS的必要过程。在这里，研究了在使用不同添加剂UPL进行堆肥期间SS中的HM去除和HM植物毒性。结果表明，添加UPL的ver堆肥显着降低了HMs的含量，并增加了SS中有机碳的含量和大骨料的比例。通过主要将可提取和可还原的HMs转化为残留产物，该过程还显着固定了HMs。杜鹃花和紫荆花的凋落物增加了SS堆肥过程中SS中可氧化HMs的含量以及HMs的累积能力。C中含C的含C的内容。相对于最初的SS，紫杉凋落物的添加量减少了31％。玉米与UPL添加蚯蚓粪，尤其是乙。与不添加UPL的SS堆肥相比，紫杉凋落物具有更高的种子发芽率，幼苗生物量，根系活性以及较低的HMs积累。这些结果表明，添加UPL的ver堆肥可以减轻SS中HM的植物毒性，并提供了一种同时回收SS和UPL的新方法。