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Enhancement of paddy straw digestibility and biogas production by sodium hydroxide-microwave pretreatment

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  • Kaur, Karamjeet
  • Phutela, Urmila Gupta

Abstract

Biogas has become a promising energy substitute to fossil fuels. Lignocellulosics, being cheap and renewable resource, could be very well used as a feedstock for biogas generation. Paddy straw is an abundant lignocellulose which is rich in organic matter like cellulose, hemi-cellulose and lignin. It is generally disposed off by burning causing environmental pollution whilst it can be used for biofuel generation. The digestibility of paddy straw is low due to high lignin and silica content. The present study was carried out to enhance paddy straw digestibility and biogas production through sodium hydroxide (NaOH) pretreatment. The paddy straw was pretreated with NaOH by soaking (24 h) in different concentrations of NaOH (2, 4, 6, 8 and 10%) and supplementing with microwave irradiations (30 min, 720 W, 180 °C). 4% NaOH-30 min microwave was found to be the best pretreatment which resulted in 65.0% decrease in lignin content and 88.7% reduction in silica content. This increased digestibility due to reduced lignin and silica content resulted in 54.7% increase in biogas production. Scanning Electron Microscopy of pretreated paddy straw revealed breakdown of lignocellulose structure resulted from the tearing of different layers of cell wall of paddy straw.

Suggested Citation

  • Kaur, Karamjeet & Phutela, Urmila Gupta, 2016. "Enhancement of paddy straw digestibility and biogas production by sodium hydroxide-microwave pretreatment," Renewable Energy, Elsevier, vol. 92(C), pages 178-184.
    • Handle: RePEc:eee:renene:v:92:y:2016:i:c:p:178-184
    DOI: 10.1016/j.renene.2016.01.083
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    Cited by:

    1. Zhang, Cunsheng & Kang, Xinxin & Wang, Fenghuan & Tian, Yufei & Liu, Tao & Su, Yanyan & Qian, Tingting & Zhang, Yifeng, 2020. "Valorization of food waste for cost-effective reducing sugar recovery in a two-stage enzymatic hydrolysis platform," Energy, Elsevier, vol. 208(C).
    2. Mustafa, Ahmed M. & Poulsen, Tjalfe G. & Sheng, Kuichuan, 2016. "Fungal pretreatment of rice straw with Pleurotus ostreatus and Trichoderma reesei to enhance methane production under solid-state anaerobic digestion," Applied Energy, Elsevier, vol. 180(C), pages 661-671.
    3. Ma, Shuaishuai & Li, Yuling & Li, Jingxue & Yu, Xiaona & Cui, Zongjun & Yuan, Xufeng & Zhu, Wanbin & Wang, Hongliang, 2022. "Features of single and combined technologies for lignocellulose pretreatment to enhance biomethane production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).
    4. Dar, R.A. & Parmar, M. & Dar, E.A. & Sani, R.K. & Phutela, U.G., 2021. "Biomethanation of agricultural residues: Potential, limitations and possible solutions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    5. Barbora Jankovičová & Miroslav Hutňan & Marianna Nagy Czölderová & Kristína Hencelová & Zuzana Imreová, 2022. "Comparison of acid and alkaline pre-treatment of lignocellulosic materials for biogas production," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 68(4), pages 195-204.
    6. Pan Zhao & Shuang Zhang & Xiaona Wang & Haishu Sun & Yan Guo & Qunhui Wang & Xiaohong Sun, 2023. "Research Progress on Anaerobic Digestion of Cellulose Waste Based on Bibliometric Analysis," Sustainability, MDPI, vol. 15(22), pages 1-16, November.
    7. Panigrahi, Sagarika & Dubey, Brajesh K., 2019. "A critical review on operating parameters and strategies to improve the biogas yield from anaerobic digestion of organic fraction of municipal solid waste," Renewable Energy, Elsevier, vol. 143(C), pages 779-797.
    8. Wipa Prapinagsorn & Sureewan Sittijunda & Alissara Reungsang, 2017. "Co-Digestion of Napier Grass and Its Silage with Cow Dung for Bio-Hydrogen and Methane Production by Two-Stage Anaerobic Digestion Process," Energies, MDPI, vol. 11(1), pages 1-16, December.
    9. Kumar, Subodh & Gandhi, Paras & Yadav, Monika & Paritosh, Kunwar & Pareek, Nidhi & Vivekanand, Vivekanand, 2019. "Weak alkaline treatment of wheat and pearl millet straw for enhanced biogas production and its economic analysis," Renewable Energy, Elsevier, vol. 139(C), pages 753-764.
    10. Anna Nowicka & Marcin Zieliński & Marcin Dębowski & Magda Dudek, 2021. "Progress in the Production of Biogas from Maize Silage after Acid-Heat Pretreatment," Energies, MDPI, vol. 14(23), pages 1-16, December.

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