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<p>Textile liquid wastes including dyes joining into water bodies cause several environmental challenges. To alleviate such challenges in circular economic perspective, domestic drinking water treatment sludge (alumina sludge) was applied to take methylene blue (MB) out from aqua systems. Adsorbents nature was explored for surface functional groups using FTIR, morphology by XRD, and point of zero charge for ionic behaviors. Four main factors (initial solution pH, contact time, dose, and MB initial concentration) were optimized to make the adsorption efficient. It was found that surface area of alum sludge resulted in 34.2&#xa0;m<sup>2</sup>/g. And, at optimum adsorption conditions of solution pH (7.0), 5&#xa0;g/L dose, and equilibrium time of 60&#xa0;min, 21.63&#xa0;mg/g adsorption per gram of adsorbent (qm) was achieved from Langmuir model, and nearly 98% removal efficiency up to 75&#xa0;mg/L MB. Alum sludge preparation, waste valorization into adsorbents, and goal of MB reduction from discharge implicated circular economy insights beyond adsorption. Thus, alum sludge could be an effective sorbent for the removal of MB from textile wastewater discharges with circular economy approaches.</p> Graphical Abstract <p></p>

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Alumina Sludge From Water Treatment Plants for Removing Methylene Blue Dye From Water: a Circular Economy Approach

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Shambel Yeshitila,
  • Tsegaye Girma Asere,
  • Menberu Yitbarek,
  • Fekadu Melak

摘要

Textile liquid wastes including dyes joining into water bodies cause several environmental challenges. To alleviate such challenges in circular economic perspective, domestic drinking water treatment sludge (alumina sludge) was applied to take methylene blue (MB) out from aqua systems. Adsorbents nature was explored for surface functional groups using FTIR, morphology by XRD, and point of zero charge for ionic behaviors. Four main factors (initial solution pH, contact time, dose, and MB initial concentration) were optimized to make the adsorption efficient. It was found that surface area of alum sludge resulted in 34.2 m2/g. And, at optimum adsorption conditions of solution pH (7.0), 5 g/L dose, and equilibrium time of 60 min, 21.63 mg/g adsorption per gram of adsorbent (qm) was achieved from Langmuir model, and nearly 98% removal efficiency up to 75 mg/L MB. Alum sludge preparation, waste valorization into adsorbents, and goal of MB reduction from discharge implicated circular economy insights beyond adsorption. Thus, alum sludge could be an effective sorbent for the removal of MB from textile wastewater discharges with circular economy approaches.

Graphical Abstract