Upgradation of chemical, fuel, thermal, and structural properties of rice husk through microwave-assisted hydrothermal carbonization

  • Sabzoi Nizamuddin
  • Muhammad Tahir Hussain Siddiqui
  • Humair Ahmed Baloch
  • Nabisab Mujawar Mubarak
  • Gregory Griffin
  • Srinivasan Madapusi
  • Akshat Tanksale
Research Article
  • 43 Downloads

Abstract

The process parameters of microwave hydrothermal carbonization (MHTC) have significant effect on yield of hydrochar. This study discusses the effect of process parameters on hydrochar yield produced from MHTC of rice husk. Results revealed that, over the ranges tested, a lower temperature, lower reaction time, lower biomass to water ratio, and higher particle size produce more hydrochar. Maximum hydrochar yield of 62.8% was obtained at 1000 W, 220 °C, and 5 min. The higher heating value (HHV) was improved significantly from 6.80 MJ/kg of rice husk to 16.10 MJ/kg of hydrochar. Elemental analysis results showed that the carbon content increased and oxygen content decreased in hydrochar from 25.9 to 47.2% and 68.5 to 47.0%, respectively, improving the energy and combustion properties. SEM analysis exhibited modification in structure of rice husk and improvement in porosity after MHTC, which was further confirmed from BET surface analysis. The BET surface area increased from 25.0656 m2/g (rice husk) to 92.6832 m2/g (hydrochar). Thermal stability of hydrochar was improved from 340 °C for rice husk to 370 °C for hydrochar.

Keywords

Rice husk Microwave processing Hydrothermal carbonization Hydrochar 

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Sabzoi Nizamuddin
    • 1
  • Muhammad Tahir Hussain Siddiqui
    • 1
  • Humair Ahmed Baloch
    • 1
  • Nabisab Mujawar Mubarak
    • 2
  • Gregory Griffin
    • 1
  • Srinivasan Madapusi
    • 1
  • Akshat Tanksale
    • 3
  1. 1.School of EngineeringRMIT UniversityMelbourneAustralia
  2. 2.Department of Chemical Engineering, Faculty of Engineering and ScienceCurtin UniversitySarawakMalaysia
  3. 3.Department of Chemical EngineeringMonash UniversityClaytonAustralia

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