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Enhanced treatment of oily wastewater through modified magnetic seeds for magnetic flocculation

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Abstract

This study delves into assessing the effectiveness of modified magnetic seeds in treating oily wastewater through magnetic flocculation. Initially, the research focuses on characterizing the magnetic seeds’ properties and evaluating their oil adsorption capabilities pre- and post-modification. The investigation identifies a correlation between the adsorption process and the second-stage kinetic magnetic seed model as well as the Langmuir model, both before and after modification. Moreover, the study highlights the enhanced adsorption capacity of modified magnetic seeds for chemical oxygen demand in comparison with conventional ones. Interestingly, both types of seeds display a closer conformity with the Freundlich adsorption isotherm model concerning their oil adsorption behaviors. In the magnetic flocculation process, polymerized aluminum chloride serves as the flocculant at a specific concentration in conjunction with magnetic seeds. Optimal treatment conditions involve maintaining a particular water temperature and pH level. These conditions facilitate a chemical oxygen demand removal rate of 75.5% and an impressive 93.2% efficiency in removing oil content. As a result, utilizing modified magnetic seeds exhibits substantial potential in degrading pollutants within oily wastewater treatment. This approach not only enhances adsorption capabilities when combined with magnetic flocculation but also provides valuable theoretical insights into treating oily wastewater via magnetic flocculation.

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Data availability

The author’s confirm that the data supporting the findings of this study are available within the article. Raw data that support the findings of this study are available from the corresponding author, upon reasonable request.

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Acknowledgements

The authors would like to thank Nitrogen Conversion Mechanism of Feammox Process Based on NDFO Iron Oxide Biocycle in Applied Basic Research Program of Liaoning Provincial Science and Technology Department.

Funding

The work was financially supported by Research on Nitrogen Conversion Mechanism of Feammox Process Based on NDFO Iron Oxide Biocycle in Applied Basic Research Program of Liaoning Provincial Science and Technology Department (2022JH2/101300120), 151536.54RMB.

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Authors and Affiliations

  1. School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang, China

    L. Zhang, B. Wang & Q. Zhang

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  1. L. Zhang
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  2. B. Wang
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  3. Q. Zhang
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Contributions

All authors contributed to the study conception and experiment design. Interpretation of data from material characterization tests was performed by BW and QZ. All authors read and approved the final manuscript.

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Correspondence to B. Wang.

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The authors declare no conflict of interest.

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Editorial responsibility: Q. Aguilar-Virgen.

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Zhang, L., Wang, B. & Zhang, Q. Enhanced treatment of oily wastewater through modified magnetic seeds for magnetic flocculation. Int. J. Environ. Sci. Technol. 21, 7717–7732 (2024). https://doi.org/10.1007/s13762-024-05484-0

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