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Efficient recovery and utilization of phosphorus from sewage sludge via alkalinous fenton-like oxidation with pyrolysis-modified red mud: Full resource utilization attempt
Tang, Jinshan1; Cheng, Zhiliang1; Tan, Shengmei1; Song, Nanchuan4; Wei, Zejun3; Liu, Yuan2
2024-10-10
摘要Red mud (RM) and sewage sludge (SS) are growing massive industrial wastes, and recycling utilization is considered a suitable disposal method. In this study, a novel Fenton-like catalyst was synthesized through copyrolysis with RM and SS with high alkaline endurance, presenting a sustainable full resource utilization of the SS. The advanced oxidation process effectively breaks down the SS structure to release phosphorus(P) for struvite recovery. The residual SS can be repurposed as fuel following direct flocculation and dehydration. There is no need for complex pH adjustments throughout. XRD pattern revealed zero valent iron (ZVI, Fe-0) as the primary catalyst phase. Experimental findings demonstrated that H2O2 efficiently disrupts bacterial structures, leading to a significant reduction in bound extracellular polymer (TB-EPS) in the SS. It was observed that the release rate of P reached nearly 100% after 60 min of reaction. The purity of recycled struvite reaches 94.9%, and the heavy metal content meets national standards. Planting experiments indicated that recycled struvite exhibited superior fertility compared to commercial fertilizers. The proposed sustainable resource production and recycling process of SS strongly supports the construction of a "city without waste".
关键词Solid waste treatment Fenton-like oxidation Magnetic recycling Phosphorus recovery Reaction mechanism
DOI10.1016/j.jclepro.2024.143588
发表期刊JOURNAL OF CLEANER PRODUCTION
ISSN0959-6526
卷号475页码:14
通讯作者Cheng, Zhiliang(purper@cqut.edu.cn) ; Wei, Zejun(124453157@qq.com) ; Liu, Yuan(liuyuan@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001317577600001
语种英语