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<p>The sludge generated after the coagulation–flocculation treatment of wastewaters still represents a major concern, knowing that they constitute a secondary pollution. This sludge can be (re)used, but isn't it risky to use sludge that still contains the original pollutant? To address a solution and contribute to the protection of the environment, this work is intended to treat generated sludge via glidarc plasma route, knowing that this process generated in-situ reactive species (HO°/NO°), UV light and post-discharges species (H<sub>2</sub>O<sub>2</sub>). The sludge was obtained by performing the coagulation–flocculation of 60&#xa0;mg L<sup>−1</sup> of amaranth red azo dye solution, using FeCl<sub>2</sub> as coagulant, which allowed an elimination dye rate of 62%. The different materials were characterized by Fourier-Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analyses and Scanning electron microscopy. FTIR analysis highlighted the presence of the coagulated pollutant in the sludge, EDX analysis showed that the mineral part of the sludge is mainly composed of iron(II) hydroxide (55%). The plasma treatment of sludge induces the removal of the residual pollutant through a decrease of its FTIR bands and enhancement of the crystallinity of the iron mineral matrix. Quantitatively, the chemical oxygen demand decreases from 78 to 19&#xa0;mg L<sup>−1</sup>, highlighting the removal of the coagulated organic pollutant. In addition, the ecotoxicity test showed a tolerance of <i>Escherichia coli</i> bacteria after plasma-treated, unlike their behaviour towards untreated sludge. This work highlights an effective approach for managing sludge and supports the principles of the circular economy by replacing virgin chemicals with a valuable secondary resource.</p>

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Efficiency of glidarc non-thermal plasma for the treatment of sludge resulting from chemical coagulation: characterization studies

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • J. B. Minkoulou-Linyoga,
  • B. Sop-Tamo,
  • F. W. Boyom-Tatchemo,
  • E. Acayanka,
  • G. Kamgang-Youbi

摘要

The sludge generated after the coagulation–flocculation treatment of wastewaters still represents a major concern, knowing that they constitute a secondary pollution. This sludge can be (re)used, but isn't it risky to use sludge that still contains the original pollutant? To address a solution and contribute to the protection of the environment, this work is intended to treat generated sludge via glidarc plasma route, knowing that this process generated in-situ reactive species (HO°/NO°), UV light and post-discharges species (H2O2). The sludge was obtained by performing the coagulation–flocculation of 60 mg L−1 of amaranth red azo dye solution, using FeCl2 as coagulant, which allowed an elimination dye rate of 62%. The different materials were characterized by Fourier-Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analyses and Scanning electron microscopy. FTIR analysis highlighted the presence of the coagulated pollutant in the sludge, EDX analysis showed that the mineral part of the sludge is mainly composed of iron(II) hydroxide (55%). The plasma treatment of sludge induces the removal of the residual pollutant through a decrease of its FTIR bands and enhancement of the crystallinity of the iron mineral matrix. Quantitatively, the chemical oxygen demand decreases from 78 to 19 mg L−1, highlighting the removal of the coagulated organic pollutant. In addition, the ecotoxicity test showed a tolerance of Escherichia coli bacteria after plasma-treated, unlike their behaviour towards untreated sludge. This work highlights an effective approach for managing sludge and supports the principles of the circular economy by replacing virgin chemicals with a valuable secondary resource.