Radical induced sewage sludge pretreatment has been developed to enhance sludge stabilization and dewaterability. Except for anaerobic digestion, the reutilization of the oxidized sludge residuals is still a challenging issue for wastewater treatment plant. In the view of favorable role in sludge disintegration, the pretreated sludge precursors, which was obtained by sequential radical oxidation and iron impregnation, was carbonized to prepare the carbon encapsulated Fe nanoparticles (Fe NPs), which could then behave as highly stable and active heterogeneous Fenton-like catalyst to degrade Black-T. By contrast, the carbonized products derived from direct iron impregnation were also prepared as a control method. The effect of H₂O₂/Fe²⁺ on zeta potential, particle size, morphology and texture structure of the pretreated sludge precursors and their corresponding influence on the carbonized materials were systematically evaluated. Results showed that radicals’ activation could facilitate the iron impregnation on sewage sludge by rupturing the microbial aggregate and making them more accessible to subsequent microbial fragments. Compared to direct iron impregnation, the carbonized products featured much higher iron insertion rate and the uniformly dispersed Fe NPs encapsulated into porous carbons, which in turn enables catalysts exhibiting more efficient catalytic activity in continuous heterogeneous Fenton-like degradation and resistance to metal leaching.

已经开发了自由基诱导的污水污泥预处理，以增强污泥的稳定性和脱水性。除厌氧消化外，氧化污泥残余物的再利用对于废水处理厂仍然是一个挑战性的问题。考虑到在污泥分解中的有利作用，将通过顺序自由基氧化和铁浸渍获得的预处理污泥前体碳化，以制备碳包裹的Fe纳米颗粒（Fe NPs），然后可以表现出高度稳定和活性的异质性类芬顿催化剂，可降解Black-T。相反，还制备了直接铁浸渍得到的碳化产物作为控制方法。H ₂ O ₂ / Fe ^2+的作用系统地评估了预处理污泥前体的ζ电位，粒径，形态和织构结构及其对碳化材料的影响。结果表明，自由基的活化可以通过破坏微生物聚集体并使随后的微生物碎片更容易进入水中，从而促进铁对污水污泥的浸渍。与直接铁浸渍相比，碳化的产品具有更高的铁插入速率和均匀分散的Fe NPs封装在多孔碳中，这反过来又使催化剂在连续的非均质Fenton类降解和对金属浸出的抵抗力方面表现出更高的催化活性。