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<p>Treatment plants play a crucial role in producing drinking water, but managing the sludge produced is a major challenge. This study aims to investigate the effect of sludge recirculation on the coagulation-flocculation treatment of water from the Ait Massoud dam. The aim is twofold: to optimize reagent doses in order to reduce treatment costs, and to limit environmental impact by reusing the sludge produced. The results showed that sludge can be used effectively as a flocculant, enabling the polyelectrolyte dose to be reduced from 0.3 to 0.1&#xa0;mg/L while maintaining the same treatment performance. As a coagulant, sludge also enabled better removal of turbidity and oxidizable matter, while reducing the dose of aluminum sulfate to 30&#xa0;mg/L. A techno-economic analysis revealed that applying this method on the scale of the plant (6 000&#xa0;m<sup>3</sup>/h) would result in daily savings of around 3,715 euros, while reducing the disposal of almost 7,200&#xa0;m<sup>3</sup>/day of sludge, thus helping to reduce the environmental footprint. Although promising, this approach needs to be validated on a larger scale and over the long term, particularly given the variability of raw water characteristics.</p>

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Optimization of sludge recirculation for sustainable water treatment at Ait Massoud dam Morocco

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月12日

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  • Radouane El Amri,
  • Rajaa Zahnoune,
  • Otmane Boudouch,
  • Reda Elkacmi

摘要

Treatment plants play a crucial role in producing drinking water, but managing the sludge produced is a major challenge. This study aims to investigate the effect of sludge recirculation on the coagulation-flocculation treatment of water from the Ait Massoud dam. The aim is twofold: to optimize reagent doses in order to reduce treatment costs, and to limit environmental impact by reusing the sludge produced. The results showed that sludge can be used effectively as a flocculant, enabling the polyelectrolyte dose to be reduced from 0.3 to 0.1 mg/L while maintaining the same treatment performance. As a coagulant, sludge also enabled better removal of turbidity and oxidizable matter, while reducing the dose of aluminum sulfate to 30 mg/L. A techno-economic analysis revealed that applying this method on the scale of the plant (6 000 m3/h) would result in daily savings of around 3,715 euros, while reducing the disposal of almost 7,200 m3/day of sludge, thus helping to reduce the environmental footprint. Although promising, this approach needs to be validated on a larger scale and over the long term, particularly given the variability of raw water characteristics.