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Why does mono-digestion of grass silage fail in long term operation?

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  • Thamsiriroj, T.
  • Nizami, A.S.
  • Murphy, J.D.

Abstract

This paper presents modelling based on 340days of operation of a small pilot-scale, 2-stage completely-mixed digester, loaded gradually up to an organic loading rate of 2.5kgm−3d−1. The reactor suffered mechanical failure in the agitation system due to high solids content in the digester. This was preceded by a 20% fall in methane production (from 455 to 363LCH4kg−1VS added) when the loading rate was increased from 2 to 2.5kgVSm−3d−1. The system was modelled using the ADM1 model which could not correctly simulate total VFA and pH in the digester system. Lactic acid is a significant element of grass silage (73% of total acids). This paper modified ADM1 through assessment of lactic acid; the results allowed close fit to experimental data. The simulation suggested that inhibition of acetogenesis initiated failure, leading to accumulation of lactic acid, reduction of acetic acid (substrate for aceticlastic methanogens), a drop in pH, less methane production, less destruction of solids, increased dry solids content and eventually failure of the mechanical agitator.

Suggested Citation

  • Thamsiriroj, T. & Nizami, A.S. & Murphy, J.D., 2012. "Why does mono-digestion of grass silage fail in long term operation?," Applied Energy, Elsevier, vol. 95(C), pages 64-76.
    • Handle: RePEc:eee:appene:v:95:y:2012:i:c:p:64-76
    DOI: 10.1016/j.apenergy.2012.02.008
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    References listed on IDEAS

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    1. Asam, Zaki-ul-Zaman & Poulsen, Tjalfe Gorm & Nizami, Abdul-Sattar & Rafique, Rashad & Kiely, Ger & Murphy, Jerry D., 2011. "How can we improve biomethane production per unit of feedstock in biogas plants?," Applied Energy, Elsevier, vol. 88(6), pages 2013-2018, June.
    2. Singh, Anoop & Smyth, Beatrice M. & Murphy, Jerry D., 2010. "A biofuel strategy for Ireland with an emphasis on production of biomethane and minimization of land-take," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 277-288, January.
    3. Nizami, A.S. & Orozco, A. & Groom, E. & Dieterich, B. & Murphy, J.D., 2012. "How much gas can we get from grass?," Applied Energy, Elsevier, vol. 92(C), pages 783-790.
    4. Smyth, Beatrice M. & Murphy, Jerry D. & O'Brien, Catherine M., 2009. "What is the energy balance of grass biomethane in Ireland and other temperate northern European climates?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(9), pages 2349-2360, December.
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    11. Nizami, A.S. & Shahzad, K. & Rehan, M. & Ouda, O.K.M. & Khan, M.Z. & Ismail, I.M.I. & Almeelbi, T. & Basahi, J.M. & Demirbas, A., 2017. "Developing waste biorefinery in Makkah: A way forward to convert urban waste into renewable energy," Applied Energy, Elsevier, vol. 186(P2), pages 189-196.
    12. Łukasz Sobol & Arkadiusz Dyjakon & Alessandro Suardi & Rainer Preißmann, 2021. "Analysis of the Possibility of Energetic Utilization of Biomass Obtained from Grass Mowing of a Large-Area Golf Course—A Case Study of Tuscany," Energies, MDPI, vol. 14(17), pages 1-22, September.
    13. Browne, James D. & Murphy, Jerry D., 2013. "Assessment of the resource associated with biomethane from food waste," Applied Energy, Elsevier, vol. 104(C), pages 170-177.
    14. Himanshu, H. & Murphy, J.D. & Grant, J. & O'Kiely, P., 2018. "Synergies from co-digesting grass or clover silages with cattle slurry in in vitro batch anaerobic digestion," Renewable Energy, Elsevier, vol. 127(C), pages 474-480.
    15. Quanlin Zhao & Shuibin He & Lianhua Li & Yongming Sun & Haiwei Ren, 2021. "Links between Process Performance and Microbial Community of Pennisetum Hybrid Co-Digested with Municipal Solid Waste," Energies, MDPI, vol. 14(12), pages 1-16, June.
    16. Andreas Meyer-Aurich & Yulia Lochmann & Hilde Klauss & Annette Prochnow, 2016. "Comparative Advantage of Maize- and Grass-Silage Based Feedstock for Biogas Production with Respect to Greenhouse Gas Mitigation," Sustainability, MDPI, vol. 8(7), pages 1-14, June.

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