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Co-Digestion-Based Circular Bio-Economy to Improve Biomethane Generation and Production of Nutrient-Enriched Digestate in Bangladesh

Author

Listed:
  • Chayan Kumer Saha

    (Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh)

  • Mst. Lucky Khatun

    (Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh)

  • Jannatoon Nime

    (Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh)

  • Kawnish Kirtania

    (Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh)

  • Md. Monjurul Alam

    (Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh)

Abstract

Anaerobic co-digestion (ACoD) of cow dung (CD) and maize cob (MC) may be envisaged as the best way to enhance biomethane formation and production of nutrient-enriched fertilizer for the implementation of a circular bio-economic system. The study aimed to find out the optimum ratio for the highest biogas production to produce heat and energy and also the generation of nutrient-enriched organic fertilizer to use in crop land. A batch study was carried out for 99 days in an incubator maintaining 35 ± 1 °C temperature for seven different test groups of CD and MC (100:0, 90:10, 70:30, 50:50, 30:70, 10:90, and 0:100). The highest biogas production (356.6 ± 21.2 mL/gVS) was at 50:50 ratio with 138.05% and 32.02% increments compared to the digestion of CD and MC alone, respectively. Kinetic modeling showed the best fit using a Logistic model to evaluate ACoD of CD and MC mathematically. ACoD of available CD and MC in Bangladesh could produce 716.63 GWh/yr electricity for consumption and a large volume of nitrogen-enriched fertilizer to use in nitrogen-deficit soil. There was no significant difference in nutrient enrichment among different test groups. Awareness about ACoD technology and proper use of digestate might bring this technology to field-level utilization and thus help to implement the circular bio-economic concept through zero waste generation.

Suggested Citation

  • Chayan Kumer Saha & Mst. Lucky Khatun & Jannatoon Nime & Kawnish Kirtania & Md. Monjurul Alam, 2023. "Co-Digestion-Based Circular Bio-Economy to Improve Biomethane Generation and Production of Nutrient-Enriched Digestate in Bangladesh," Sustainability, MDPI, vol. 16(1), pages 1-19, December.
    • Handle: RePEc:gam:jsusta:v:16:y:2023:i:1:p:104-:d:1304978
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    References listed on IDEAS

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    1. Islam Mohammed Mahbubul & Miah Himan, 2023. "Prospects of Bioethanol from Agricultural Residues in Bangladesh," Energies, MDPI, vol. 16(12), pages 1-21, June.
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