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Influence of Different Pretreatment Methods and Conditions on the Anaerobic Digestion Efficiency of Spent Mushroom Substrate

Author

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  • Jongkeun Lee

    (Department of Environmental and Energy Engineering, School of Smart and Green Engineering, College of Engineering, Changwon National University, Gyeongnam 51140, Republic of Korea)

  • Do-yoon Ryu

    (Department of Environmental and Technology Engineering, College of Engineering, Daegu University, Gyeongbuk 38453, Republic of Korea)

  • Kye Hwan Jang

    (Technical Research Institute, BHI Co., Ltd., Haman-gun 52063, Republic of Korea)

  • Jong Wook Lee

    (Technical Research Institute, BHI Co., Ltd., Haman-gun 52063, Republic of Korea)

  • Daegi Kim

    (Department of Environmental and Technology Engineering, College of Engineering, Daegu University, Gyeongbuk 38453, Republic of Korea)

Abstract

Consumption of mushrooms has recently increased due to their health benefits; consequently, increased mushroom cultivation generates large volumes of spent mushroom substrate (SMS) and effective methods for SMS valorization are thus required. Anaerobic digestion (AD) processes SMS with minimal energy and reduces the amount of waste generated; moreover, it contributes to energy generation through biogas production. To improve the energy efficiency of AD and promote sufficient biomass pretreatment, thermal pretreatment conditions require further investigation. Here, we evaluated the pretreatment efficiency and biogas production of the SMS thermal pretreatment process, studying different pretreatment temperatures to understand the formation of SMS degradation products and the changes in AD efficiency. Particularly, mechanical and hydrothermal pretreatment (HTP) methods were employed to improve SMS biodegradability. By increasing the substrate solubilization efficiency, HTP increased the biogas yield more effectively than mechanical pretreatment. Additionally, HTP improved the substrate’s physicochemical properties and increased the reactive surface area for microorganisms by changing the substrate morphology. Further, the biodegradability of the hydrothermally pretreated SMS was higher (87.46%) than that of the mechanically pretreated SMS (61.37%). Thus, SMS could be employed in biogas production and HTP play a key role in improving the biogas yield during SMS processing.

Suggested Citation

  • Jongkeun Lee & Do-yoon Ryu & Kye Hwan Jang & Jong Wook Lee & Daegi Kim, 2022. "Influence of Different Pretreatment Methods and Conditions on the Anaerobic Digestion Efficiency of Spent Mushroom Substrate," Sustainability, MDPI, vol. 14(23), pages 1-10, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:23:p:15854-:d:986921
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    References listed on IDEAS

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    1. Lee, Jongkeun & Lee, Kwanyong & Sohn, Donghwan & Kim, Young Mo & Park, Ki Young, 2018. "Hydrothermal carbonization of lipid extracted algae for hydrochar production and feasibility of using hydrochar as a solid fuel," Energy, Elsevier, vol. 153(C), pages 913-920.
    2. Kim, Daegi & Park, Seyong & Park, Ki Young, 2017. "Upgrading the fuel properties of sludge and low rank coal mixed fuel through hydrothermal carbonization," Energy, Elsevier, vol. 141(C), pages 598-602.
    3. Jay N. Meegoda & Brian Li & Kush Patel & Lily B. Wang, 2018. "A Review of the Processes, Parameters, and Optimization of Anaerobic Digestion," IJERPH, MDPI, vol. 15(10), pages 1-16, October.
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