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<p>The discharge of olive mill wastewater (OMWW) effluent poses severe risks of ecological disruption, in particular. This study introduces an innovative and efficient process for raw OMWW treatment based on the adsorption performance through dynamic filtration of OMWW using olive stone (OS) and biochar (BC)-packed filters. The efficiency improvement of the filters and their potential for pollutant re-release were examined using single and two-fold filtration procedures.&#xa0;The prepared BC exhibits a high specific area of&#xa0;about 258,72 m<sup>2</sup>/g, as estimated using both the Brunauer, Emmett, and Teller (BET) and Langmuir approaches. The detailed pore structure analysis revealed significant micropore and external surface areas of about 115.58 m<sup>2</sup>/g and 143.14 m<sup>2</sup>/g, respectively, highlighting the potential of the prepared BC for efficient contaminant adsorption. When operating at a flow rate of 1 mL/min, the removal rates of total solid suspended matter (TSS) and mineral matter (MM) from raw OMWW using a two-step BC filtration reach approximately 91.6% and 68.5%, respectively. Furthermore, notable reductions in total phenolic compounds (TPC) and chemical oxygen demand (COD) are observed with removal rates of up to 73.5% and 76.4%, respectively. The TPC concentration in raw OMWW drops from 6.8 g/L to approximately 1.8 g/L after the second filtration stage by BC. The Thomas, Adams-Bohart, and Yoon-Nelson models were applied to optimize the fit of the kinetic data obtained from the adsorption measurements. This innovative approach unveiled the performance of OS-derived BC as a sustainable and efficient adsorbent for OMWW pollutants and foresees its potential in the treatment of further wastewater sources.</p>

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Innovative Dynamic Filtration of Olive Mill Wastewater: Comparing the Efficiency of Biochar and Olive Stone

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Kawtar Ezzahi,
  • Imad Rabichi,
  • Nabil Rochdi,
  • Rachid Idouhli,
  • Mohamed Hafidi,
  • Abdelaziz Baçaoui,
  • Abdelghani Yaacoubi,
  • Rajaa Rochdi,
  • Loubna EL Fels

摘要

The discharge of olive mill wastewater (OMWW) effluent poses severe risks of ecological disruption, in particular. This study introduces an innovative and efficient process for raw OMWW treatment based on the adsorption performance through dynamic filtration of OMWW using olive stone (OS) and biochar (BC)-packed filters. The efficiency improvement of the filters and their potential for pollutant re-release were examined using single and two-fold filtration procedures. The prepared BC exhibits a high specific area of about 258,72 m2/g, as estimated using both the Brunauer, Emmett, and Teller (BET) and Langmuir approaches. The detailed pore structure analysis revealed significant micropore and external surface areas of about 115.58 m2/g and 143.14 m2/g, respectively, highlighting the potential of the prepared BC for efficient contaminant adsorption. When operating at a flow rate of 1 mL/min, the removal rates of total solid suspended matter (TSS) and mineral matter (MM) from raw OMWW using a two-step BC filtration reach approximately 91.6% and 68.5%, respectively. Furthermore, notable reductions in total phenolic compounds (TPC) and chemical oxygen demand (COD) are observed with removal rates of up to 73.5% and 76.4%, respectively. The TPC concentration in raw OMWW drops from 6.8 g/L to approximately 1.8 g/L after the second filtration stage by BC. The Thomas, Adams-Bohart, and Yoon-Nelson models were applied to optimize the fit of the kinetic data obtained from the adsorption measurements. This innovative approach unveiled the performance of OS-derived BC as a sustainable and efficient adsorbent for OMWW pollutants and foresees its potential in the treatment of further wastewater sources.