“双碳”背景下我国市政污泥磷回收技术进展及发展趋势

Progress and Future Trend of Phosphorus Recovery Technology from Municipal Sewage Sludge under the Background of “Carbon Peaking and Carbon Neutrality”

摘要: 磷在生物体尤其是农作物生长中起到了重要作用，而磷资源在当下呈现短缺的状态，从市政污泥中回收磷也就成为了未来污水处理的必然之路。污泥中的磷含量在1%~3%左右，主要以正磷酸离子等无机磷形式存在，回收磷具有可行性。回收的原理主要是加入钙、镁等离子进行沉淀回收。目前，现有投入使用的污泥磷回收技术可以分为在溶液中沉淀的湿化学反应法和加热沉淀的热处理法，二者分别存在回收率低和成本、耗能高的问题。未来磷回收将结合“双碳”战略目标，走向节能减排之路，可行的发展方向包括浓缩污泥回收、结合生物处理以及源分离技术，它们都可以降低能耗、减少成本并提高回收率。

Abstract: Phosphorus plays an important role in the growth of organisms, especially crops, and phosphorus resources are in a state of shortage at present. Recovering phosphorus from municipal sludge has become an inevitable way for future sewage treatment. Phosphorus content in sludge is about 1%~3%, which mainly exists in the form of inorganic phosphorus such as orthophosphate ion, so it is feasible to recover phosphorus. The main principle of recovery is to add calcium and magnesium plasma for precipitation recovery. At present, the existing sludge phosphorus recovery technology can be divided into wet chemical reaction method of precipitation in solution and heat treatment method of heated precipitation, which have the problems of low recovery rate and high cost and energy consumption respectively. In the future, phosphorus recycling will be combined with the “Carbon peaking and carbon neutrality” strategic goals and move towards the road of energy conservation and emission reduction. Possible development directions include concentrated sludge recovery, combined biological treatment and source separation technologies, all of which can reduce energy consumption, reduce costs and increase recovery efficiencies.