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A review on sustainable reuse applications of Fenton sludge during wastewater treatment

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Abstract

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.

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Acknowledgements

We thank LetPub for its linguistic assistance during the preparation of this manuscript. L. Gao acknowledges the financial support of the National Natural Science Foundation of China (Grant No. 5210040121), Jiangsu Provincial Natural Science Foundation of Jiangsu Province (No. BK20210498) and the fellowship of China Postdoctoral Science Foundation (No. 2021M693420).

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Authors and Affiliations

  1. School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China

    Lihui Gao & Lizhang Wang

  2. National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, China

    Yijun Cao & Shulei Li

  3. School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou, 450001, China

    Yijun Cao

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  1. Lihui Gao
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Highlights

• The sustainable approaches related to Fenton sludge reuse systems are summarized.

• Degradation mechanism of Fenton sludge heterogeneous catalyst is deeply discussed.

• The efficient utilization directions of Fenton sludge are proposed.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Gao, L., Cao, Y., Wang, L. et al. A review on sustainable reuse applications of Fenton sludge during wastewater treatment. Front. Environ. Sci. Eng. 16, 77 (2022). https://doi.org/10.1007/s11783-021-1511-6

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