Journal
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
Volume 16, Issue 6, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-021-1511-6
Keywords
Fenton sludge; Heavy metals; Coagulant; Iron source; Heterogeneous catalyst
Categories
Funding
- National Natural Science Foundation of China [5210040121]
- Jiangsu Provincial Natural Science Foundation of Jiangsu Province [BK20210498]
- China Postdoctoral Science Foundation [2021M693420]
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This review article comprehensively summarizes the utilization of Fenton sludge in wastewater treatment, including coagulant preparation, its reuse as an iron source and catalyst/adsorbent, as well as its application as a catalyst for resource utilization. Future research ideas are also suggested to enhance the cost-effectiveness, environmental sustainability, and large-scale feasibility of Fenton sludge applications.
The classical Fenton oxidation process (CFOP) is a versatile and effective application that is generally applied for recalcitrant pollutant removal. However, excess iron sludge production largely restricts its widespread application. Fenton sludge is a hazardous solid waste, which is a complex heterogeneous mixture with Fe(OH)(3), organic matter, heavy metals, microorganisms, sediment impurities, and moisture. Although studies have aimed to utilize specific Fenton sludge resources based on their iron-rich characteristics, few reports have fully reviewed the utilization of Fenton sludge. As such, this review details current sustainable Fenton sludge reuse systems that are applied during wastewater treatment. Specifically, coagulant preparation, the reuse of Fenton sludge as an iron source in the Fenton process and as a synthetic heterogeneous catalyst/adsorbent, as well as the application of the Fenton sludge reuse system as a heterogeneous catalyst for resource utilization. This is the first review article to comprehensively summarize the utilization of Fenton sludge. In addition, this review suggests future research ideas to enhance the cost-effectiveness, environmental sustainability, and large-scale feasibility of Fenton sludge applications. (c) Higher Education Press 2021
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