Optimization of coconut husk by anaerobic digestion: Chemical pretreatment to reduce the recalcitrant structure

Nikita Kanaujia*, Jiwan Singh

Department of Environmental Science, Babasaheb Bhimrao Ambedkar University, Lucknow-226025, India

ARTICLE INFOR: Received: 16 May 2023; Revised: 08 June 2023; Accepted: 08 June 2023

CORRESPONDING AUTHOR: E-mail: nikitakanaujia18@gmail.com (N. Kanaujia)

Cite this article: Kanaujia, N., Singh, J., 2023. Optimization of coconut husk by anaerobic digestion: Chemical pre-treatment to reduce the recalcitrant structure. J. Appl. Sci. Innov. Technol. 2 (1), 43-46.


  • Proper optimization of coconut husk by anaerobic digestion.
  • Chemical pretreatment of coconut husk gives justified result.
  • Highest cumulative methane was obtained from coconut husk treated with sodium hydroxide.
  • Pretreated coconut husk has increased methane yield by 1.55 fold and 2.21 fold than CCD and control, respectively.


Coconut husk is generated in huge amount in India and, it may be used as bioenergy sources for areas with limited fuel resources. Despite their potential applicability for energy, coconut husks and shells are often discarded or burned unprocessed, which leads to poor hygiene and environmental degradation. This study was done for proper utilization of coconut husk by anaerobic digestion. Chemical pre-treatment was found one of the best ways to treat lignocellulosic biomass. Chemical pre-treatment by sodium hydroxide was given to coconut husk to reduce the recalcitrant structure of biomass. The batch test was performed to analyze the biodegradability of pre-treated coconut husk. Results of chemically pre-treated coconut husk were found better as compare to untreated coconut husk. The highest cumulative methane yield was obtained in coconut husk pre-treated with sodium hydroxide (TCH) 842.25 ± 29.75 mL followed by untreated coconut husk (UCH) 548.60±6.0 mL and control 381.50 ± 1.5mL. Similarly Volatile fatty acid (VFA) and soluble chemical oxygen demand (sCOD) were found higher in TCH as compared to UCH and control.

Keywords: Anaerobic digestion; coconut husk; chemical pre-treatment; biogas production

Scope: Environmental Engineering & Sciences

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