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Hot water washing of rice husk for ash removal: The effect of washing temperature, washing time and particle size

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  • Bandara, Yasas Wishvajith
  • Gamage, Pringa
  • Gunarathne, Duleeka Sandamali

Abstract

Rice husk is a carbon neutral and renewable source of energy and a biomaterial precursor, abundantly available at no cost. High ash content of rice husk is problematic for both applications and thus, reduction of ash constituents can be seen as a viable and sustainable solution. The effect of temperature, particle size and washing time on total ash removal percentage as well as elemental removal was evaluated. The ash leaching behavior was analyzed by fitting to a pseudo-second order kinetic model. 88–95% of K2O, 60–83% of P2O5, 38–54% of Fe2O3, 34–62% of Al2O3, 30–46% TiO2 and 19–24% of SiO2 has removed through water washing. According to the (K + Na)/(Ca + Mg) and (Si + K + P)/(Ca + Mg) molar ratios, ash melting tendency is expected to reduce significantly during combustion of washed rice husk. Increase of Ca and Mg in washed rice husk due to use of city water is beneficial for the ash chemistry. Washing temperature of 50 °C and 15 min of washing time with 1–1.4 mm particle size is recommended for washing pretreatment of rice husk.

Suggested Citation

  • Bandara, Yasas Wishvajith & Gamage, Pringa & Gunarathne, Duleeka Sandamali, 2020. "Hot water washing of rice husk for ash removal: The effect of washing temperature, washing time and particle size," Renewable Energy, Elsevier, vol. 153(C), pages 646-652.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:646-652
    DOI: 10.1016/j.renene.2020.02.038
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    References listed on IDEAS

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    1. Bazargan, Alireza & Bazargan, Majid & McKay, Gordon, 2015. "Optimization of rice husk pretreatment for energy production," Renewable Energy, Elsevier, vol. 77(C), pages 512-520.
    2. Iáñez-Rodríguez, Irene & Martín-Lara, María Ángeles & Pérez, Antonio & Blázquez, Gabriel & Calero, Mónica, 2020. "Water washing for upgrading fuel properties of greenhouse crop residue from pepper," Renewable Energy, Elsevier, vol. 145(C), pages 2121-2129.
    3. Lim, Jeng Shiun & Abdul Manan, Zainuddin & Wan Alwi, Sharifah Rafidah & Hashim, Haslenda, 2012. "A review on utilisation of biomass from rice industry as a source of renewable energy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3084-3094.
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    Cited by:

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    2. Li, Xiaomin & Chen, Xi & Zhang, Chuxuan & Peng, Zhengkang & Gong, Xun, 2024. "PM10 emissions from co-combustion of water washed sea rice waste with coal," Applied Energy, Elsevier, vol. 356(C).
    3. Jiang, Jiahao & Tie, Yuan & Deng, Lei & Che, Defu, 2022. "Influence of water-washing pretreatment on ash fusibility of biomass," Renewable Energy, Elsevier, vol. 200(C), pages 125-135.

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