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<p>In this study, the performance of two hybrid biological treatment systems, Modified Ludzack–Ettinger combined with a Moving Bed Biofilm Reactor (MLE–MBBR) and Sequencing Batch Reactor combined with a Moving Bed Biofilm Reactor (SBR–MBBR), was evaluated under discontinuous feeding conditions for the treatment of industrial wastewater with a low COD/BOD₅ ratio. The performance of these systems was compared with a conventional continuous aeration activated sludge process. Twelve operational and water quality variables were analyzed to assess treatment efficiency. Results showed that hydraulic retention time (HRT) significantly affected process performance. Both MLE–MBBR and SBR–MBBR systems effectively removed chemical oxygen demand (COD), total nitrogen (TN), and phosphate (PO₄³⁻), with COD removal playing a key role in nutrient removal efficiency. The MLE–MBBR system achieved its highest removal efficiency at an HRT of 20&#xa0;h, with 86.2% BOD₅, 93.5% COD, 80% TN, 56.5% PO₄³⁻, and 89% total suspended solids (TSS) removal. The SBR–MBBR system reached optimal performance at an HRT of 12&#xa0;h, removing 85% BOD₅, 94% COD, 68.25% TN, 37% PO₄³⁻, and 89% TSS. These results highlight the potential of MLE–MBBR and SBR–MBBR systems as efficient, space-saving, and sustainable solutions for industrial wastewater treatment.</p>

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Comparative evaluation of MLE–MBBR and SBR–MBBR systems for simultaneous carbon, nitrogen, and phosphorus removal from low COD/BOD₅ industrial wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月20日

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  • Saeid Eslamian,
  • Yaser Sabzevari,
  • Reza Bahadori,
  • Mohsen Pishva

摘要

In this study, the performance of two hybrid biological treatment systems, Modified Ludzack–Ettinger combined with a Moving Bed Biofilm Reactor (MLE–MBBR) and Sequencing Batch Reactor combined with a Moving Bed Biofilm Reactor (SBR–MBBR), was evaluated under discontinuous feeding conditions for the treatment of industrial wastewater with a low COD/BOD₅ ratio. The performance of these systems was compared with a conventional continuous aeration activated sludge process. Twelve operational and water quality variables were analyzed to assess treatment efficiency. Results showed that hydraulic retention time (HRT) significantly affected process performance. Both MLE–MBBR and SBR–MBBR systems effectively removed chemical oxygen demand (COD), total nitrogen (TN), and phosphate (PO₄³⁻), with COD removal playing a key role in nutrient removal efficiency. The MLE–MBBR system achieved its highest removal efficiency at an HRT of 20 h, with 86.2% BOD₅, 93.5% COD, 80% TN, 56.5% PO₄³⁻, and 89% total suspended solids (TSS) removal. The SBR–MBBR system reached optimal performance at an HRT of 12 h, removing 85% BOD₅, 94% COD, 68.25% TN, 37% PO₄³⁻, and 89% TSS. These results highlight the potential of MLE–MBBR and SBR–MBBR systems as efficient, space-saving, and sustainable solutions for industrial wastewater treatment.