【目的】市政污泥被认为是磷的“替代矿山”,热处理技术是其资源化利用和无害化处理的重要手段。总结污泥热处理过程中不同添加剂同步稳定磷与重金属的基础上,重点阐述钙基添加剂对磷和重金属的同步固化机理。【方法】从磷与重金属的化学形态分析入手,总结了二者在污泥焚烧、热解、气化和水热碳化等热处理方式中的迁移转化规律,重点归纳钙基、镁基、氯化物等不同添加剂对磷和重金属稳定化的影响机制,并关注到CaO的添加促进了非磷灰石态无机磷向磷灰石态无机磷的转化,提高磷可利用性的同时实现重金属的共稳定化。【结果】在市政污泥气化过程中探索CaO对磷和重金属的共稳定机制及三者在气化过程中的相互作用机理是未来的研究方向之一。

【Purposes】Sewage sludge is considered as a “substitute mine” for phosphorus, and  thermal processing is an important means for its resource utilization and harmless treatment. Through  summarizing the simultaneous stabilization of phosphorus and heavy metals with various additives dur‐ ing the thermal treatment of sludge, the simultaneous solidification mechanism of calcium-based addi‐ tives for phosphorus and heavy metals is elucidated in this review. 【Methods】 The migration and  transformation laws of phosphorus and heavy metals in thermal processes such as incineration, pyroly‐ sis, gasification, and hydrothermal carbonization are summarized, and the impact mechanisms of cal‐ cium-, magnesium-, and chloride-based additives on the stabilization of phosphorus and heavy met‐ als are generalized. It is noted that the addition of CaO promotes the conversion of non-apatite inor‐ ganic phosphorus to apatite inorganic phosphorus, improves the availability of phosphorus, and  achieves co-stabilization of heavy metals. 【Findings】 Exploring the co-stabilization of CaO on phos‐ phorus and heavy metals during sludge gasification, as well as the interaction mechanism between the  three during gasification, is one of the future research directions.