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The improper handling of various wastes, particularly wastewater generated by tanning processes, has led to significant environmental issues and adversely affected human health. Despite ongoing efforts to mitigate tannery wastewater pollution, end-of-pipe treatment methods remain the most commonly used approach. This study investigates the treatment of tannery wastewater using coagulation-flocculation processes with three coagulants: Al2(SO4)3·18H2O, FeCl3, and Ca(OH)2. The research focuses on optimizing pH and coagulant dosages to achieve maximum pollutant removal efficiency, minimal sludge production, and enhanced biodegradability. Results demonstrate that up to 71% COD, 92% color, and 97% chromium removal can be achieved under optimal conditions. Al2(SO4)3·18H2O and Ca(OH)2 proved more effective than FeCl3 in pollutant removal and biodegradability improvement. However, Ca(OH)2 produced higher sludge volumes, affecting economic feasibility. The study concludes that Al2(SO4)3·18H2O is the most suitable coagulant, offering high removal efficiency, low sludge production, and improved biodegradability, making it viable for integration into biological treatment processes. These findings contribute to sustainable tannery wastewater management strategies.

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Sustainable Treatment of Tannery Effluents: Pollution Reduction and Biodegradability Improvements

  • 章节

  • 发表日期：

    2025年

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  • Rachid Faouzi,
  • Hassan Oumesaoud,
  • Soukaina Harif,
  • Moulay Abdelazize Aboulhassan

摘要

The improper handling of various wastes, particularly wastewater generated by tanning processes, has led to significant environmental issues and adversely affected human health. Despite ongoing efforts to mitigate tannery wastewater pollution, end-of-pipe treatment methods remain the most commonly used approach. This study investigates the treatment of tannery wastewater using coagulation-flocculation processes with three coagulants: Al2(SO4)3·18H2O, FeCl3, and Ca(OH)2. The research focuses on optimizing pH and coagulant dosages to achieve maximum pollutant removal efficiency, minimal sludge production, and enhanced biodegradability. Results demonstrate that up to 71% COD, 92% color, and 97% chromium removal can be achieved under optimal conditions. Al2(SO4)3·18H2O and Ca(OH)2 proved more effective than FeCl3 in pollutant removal and biodegradability improvement. However, Ca(OH)2 produced higher sludge volumes, affecting economic feasibility. The study concludes that Al2(SO4)3·18H2O is the most suitable coagulant, offering high removal efficiency, low sludge production, and improved biodegradability, making it viable for integration into biological treatment processes. These findings contribute to sustainable tannery wastewater management strategies.