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Acid and alkali pretreatment of agro by-products: Evaluating torrefaction efficiency and dechlorination

Author

Listed:
  • Park, Sunyong
  • Kim, Seok Jun
  • Oh, Kwang Cheol
  • Cho, Lahoon
  • Jeon, Young Kwang
  • Kim, Dae Hyun

Abstract

Utilisation of crop residues is limited due to their low energy and high ash content. This study aimed to develop a method for enabling the use of residual agricultural biomass through acid or alkali pretreatment followed by torrefaction. Pepper stems were treated with hydrochloric acid or sodium hydroxide for a brief period of time and rinsed with distilled water. Untreated and acid-pretreated samples had cellulose contents of 43.85% and 36.57%, respectively. The lignin content in the alkali-pretreated samples (22.74%) was lower than that in untreated samples (27.40%). Mass yield decreased with torrefaction temperature, ranging from 86.19% to 49.89%. However, alkali-treated samples showed smaller changes in mass yield (70.31–60.43%) than other samples. Regarding calorific value, untreated samples exhibited the highest increase (26.37%), whereas alkali-treated samples showed a modest increase of 10.62%. Chlorine content was higher in acid-compared with alkali-treated samples but decreased with temperature. Our study demonstrated that agricultural by-products can be used as energy sources through acid or alkali pretreatment prior to torrefaction. Future studies should explore a variety of agricultural by-products and consider pretreatment with different acids or alkalis, such as sulfuric acid and potassium hydroxide.

Suggested Citation

  • Park, Sunyong & Kim, Seok Jun & Oh, Kwang Cheol & Cho, Lahoon & Jeon, Young Kwang & Kim, Dae Hyun, 2023. "Acid and alkali pretreatment of agro by-products: Evaluating torrefaction efficiency and dechlorination," Energy, Elsevier, vol. 283(C).
    • Handle: RePEc:eee:energy:v:283:y:2023:i:c:s0360544223019424
    DOI: 10.1016/j.energy.2023.128548
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