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<p>The disposal of macroalgal waste presents environmental and economic challenges, but its valorization offers interesting opportunities. Hydrothermal carbonization (HTC) is a promising technology for transforming this waste into hydrochar, a carbon-rich material with energy and industrial applications. This study aims to optimize HTC process parameters, including temperature (180–260&#xa0;°C), residence time (0–240&#xa0;min), and solid/water ratio (S/W), to improve hydrochar yield, higher heating value (HHV), and energy efficiency, using response surface methodology (Box-Behnken design). The results revealed that temperature and residence time were the most influential factors on hydrochar production. The maximum higher heating value (HHV) of 18.71&#xa0;MJ/kg was observed at 260&#xa0;°C, 240&#xa0;min, and a 0.1875 S/W ratio, indicating efficient energy conversion. On the other hand, the highest hydrochar yield and energy yield were obtained at 180&#xa0;°C, 0&#xa0;min, and a 0.1875 S/W ratio, suggesting that more moderate conditions favor better material retention. Analysis of the samples showed an increase in porosity and an improvement in the physico-chemical characteristics of hydrochar compared with raw waste, reinforcing its potential as a biofuel or adsorbent material. These results confirm that the valorization of macroalgal waste by HTC represents a promising solution for the production of renewable energy, thus contributing to the sustainable management of resources in Morocco.</p> Graphical Abstract <p></p>

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Valorization of Moroccan macroalgae wastes in hydrochar production: parameter evaluation and energetic properties

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • Oumayma Belyazid,
  • Amine Miftah,
  • Abdellatif Barakat,
  • Khalifa El Harfi,
  • Adil Aboulkas

摘要

The disposal of macroalgal waste presents environmental and economic challenges, but its valorization offers interesting opportunities. Hydrothermal carbonization (HTC) is a promising technology for transforming this waste into hydrochar, a carbon-rich material with energy and industrial applications. This study aims to optimize HTC process parameters, including temperature (180–260 °C), residence time (0–240 min), and solid/water ratio (S/W), to improve hydrochar yield, higher heating value (HHV), and energy efficiency, using response surface methodology (Box-Behnken design). The results revealed that temperature and residence time were the most influential factors on hydrochar production. The maximum higher heating value (HHV) of 18.71 MJ/kg was observed at 260 °C, 240 min, and a 0.1875 S/W ratio, indicating efficient energy conversion. On the other hand, the highest hydrochar yield and energy yield were obtained at 180 °C, 0 min, and a 0.1875 S/W ratio, suggesting that more moderate conditions favor better material retention. Analysis of the samples showed an increase in porosity and an improvement in the physico-chemical characteristics of hydrochar compared with raw waste, reinforcing its potential as a biofuel or adsorbent material. These results confirm that the valorization of macroalgal waste by HTC represents a promising solution for the production of renewable energy, thus contributing to the sustainable management of resources in Morocco.

Graphical Abstract