Phosphorus (P) is an indispensable element of living organisms and plays an irreplaceable role in the growth of crops. As a non-renewable element, the reserves of phosphorus rock, the primary source of phosphorus in nature, are facing the danger of exhaustion. As a phosphorus-rich solid waste, sewage sludge has gradually become a main renewable phosphorus resource. The combination of effective recycling of phosphorus and innocuous disposal of sewage sludge can not only alleviate the crisis of phosphate rock resources shortage but also reduce the environmental hazards of sewage sludge. This study reviewed the application of thermal treatment in sewage sludge disposal. Besides the advantages of reducing waste volume, decomposing organic pollutants, generating valuable byproducts, it can also significantly promote the recycling of phosphorus. Studies have shown that thermal treatment (incineration, pyrolysis, and hydrothermal) can enrich phosphorus in the products and transform the speciation of phosphorus to increase the bioavailability. The physical and chemical properties of different thermal treatment products and the speciation of phosphorus are different. The transformation and migration of phosphorus affect the efficiency of subsequent phosphorus recovery and reuse. At the same time, this study compared several general phosphorus recovery methods (wet extraction, thermochemical, and electrochemical methods), and further summarized the advantages and disadvantages of various methods and application conditions. This review summarizes recent advances in phosphorus recovery from sewage sludge, identifies challenges and knowledge gaps, and provides the foundation for future research aimed at achieving efficient, economic, and eco-friendly reclamation of phosphorus in sewage sludge.

中文翻译：

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污水污泥不同热处理产品中磷的回收研究综述

磷（P）是生物体不可缺少的元素，在农作物生长中起着不可替代的作用。作为不可再生的元素，磷的储备是自然界中磷的主要来源，正面临耗尽的危险。作为一种富含磷的固体废物，污水污泥已逐渐成为主要的可再生磷资源。有效回收磷和无害化处理污泥相结合，不仅可以缓解磷矿石资源短缺的危机，而且可以减少污泥的环境危害。本研究综述了热处理在污水污泥处置中的应用。除减少废物量，分解有机污染物，产生有价值的副产品外，它还可以显着促进磷的循环利用。研究表明，热处理（焚烧，热解和水热处理）可以使产品中的磷富集并改变磷的形态，从而提高生物利用度。不同热处理产品的物理和化学性质以及磷的形态不同。磷的转化和迁移影响后续磷回收和再利用的效率。同时，本研究比较了几种常用的磷回收方法（湿法提取，热化学和电化学方法），并进一步总结了各种方法和应用条件的优缺点。这篇综述总结了从污泥中回收磷的最新进展，指出了挑战和知识差距，