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<p>Olive pomace ash, a by-product of olive pomace combustion for energy production, poses increasing challenges for environmental pollution and waste management. However, its chemical composition, which is comparable to that of natural clay, makes it suitable for partial substitution in fired bricks. In addition, its richness in fluxing oxides can contribute to lowering the firing temperature and enhancing the mechanical performance of the final product, making it a promising candidate for sustainable construction materials. This study examines the effects of incorporating various types of olive pomace ash, at rates from 0 to 7% by weight, into clay brick production, emphasizing the potential for technology transfer to the brick manufacturing industry. The bricks were evaluated based on water absorption, bulk density, loss on ignition, linear shrinkage, thermal conductivity, specific heat capacity, compressive strength, economic cost, and heavy metal leaching. The olive pomace ash acted as a pore-forming agent, reducing both density and thermal conductivity. However, this increased porosity resulted in higher water absorption and lower compressive strength, while still meeting construction standards. Environmental analysis confirmed that the bricks met regulatory limits for heavy metal content, ensuring their safe use. These results highlight the potential for olive pomace ash valorization in producing eco-friendly bricks with improved thermal performance, offering a sustainable solution to environmental and economic challenges.</p>

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From waste to value: olive pomace ash as a sustainable additive in clay-bricks

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Ines Labaied,
  • Omar Douzane,
  • Marzouk Lajili,
  • Geoffrey Promis

摘要

Olive pomace ash, a by-product of olive pomace combustion for energy production, poses increasing challenges for environmental pollution and waste management. However, its chemical composition, which is comparable to that of natural clay, makes it suitable for partial substitution in fired bricks. In addition, its richness in fluxing oxides can contribute to lowering the firing temperature and enhancing the mechanical performance of the final product, making it a promising candidate for sustainable construction materials. This study examines the effects of incorporating various types of olive pomace ash, at rates from 0 to 7% by weight, into clay brick production, emphasizing the potential for technology transfer to the brick manufacturing industry. The bricks were evaluated based on water absorption, bulk density, loss on ignition, linear shrinkage, thermal conductivity, specific heat capacity, compressive strength, economic cost, and heavy metal leaching. The olive pomace ash acted as a pore-forming agent, reducing both density and thermal conductivity. However, this increased porosity resulted in higher water absorption and lower compressive strength, while still meeting construction standards. Environmental analysis confirmed that the bricks met regulatory limits for heavy metal content, ensuring their safe use. These results highlight the potential for olive pomace ash valorization in producing eco-friendly bricks with improved thermal performance, offering a sustainable solution to environmental and economic challenges.