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How can we improve biomethane production per unit of feedstock in biogas plants?

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  • Asam, Zaki-ul-Zaman
  • Poulsen, Tjalfe Gorm
  • Nizami, Abdul-Sattar
  • Rafique, Rashad
  • Kiely, Ger
  • Murphy, Jerry D.

Abstract

Biogas production is one of the number of tools that may be used to alleviate the problems of global warming, energy security and waste management. Biogas plants can be difficult to sustain from a financial perspective. The facilities must be financially optimized through use of substrates with high biogas potential, low water content and low retention requirement. This research carried out in laboratory scale batch digesters assessed the biogas potential of energy crops (maize and grass silage) and solid manure fractions from manure separation units. The ultimate methane productivity in terms of volatile solids (VS) was determined as 330, 161, 230, 236, 361Â L/kg VS from raw pig slurry, filter pressed manure fiber (FPMF), chemically precipitated manure fiber (CPMF), maize silage and grass silage respectively. Methane productivity based on mass (L/kg substrate) was significantly higher in FPMF (55Â L/kg substrate), maize silage (68Â L/kg substrate) and grass silage (45-124Â L/kg substrate (depending on dry solids of feedstock)) as in comparison to raw pig slurry (10Â L/kg substrate). The use of these materials as co-substrates with raw pig slurry will increase significantly the biomethane yield per unit feedstock in the biogas plant.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:6:p:2013-2018
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    References listed on IDEAS

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    1. 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.
    2. Rafique, Rashad & Poulsen, Tjalfe Gorm & Nizami, Abdul-Sattar & Asam, Zaki-ul-Zaman & Murphy, Jerry D. & Kiely, Gerard, 2010. "Effect of thermal, chemical and thermo-chemical pre-treatments to enhance methane production," Energy, Elsevier, vol. 35(12), pages 4556-4561.
    3. Murphy, J. D. & McKeogh, E. & Kiely, G., 2004. "Technical/economic/environmental analysis of biogas utilisation," Applied Energy, Elsevier, vol. 77(4), pages 407-427, April.
    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.
    5. Nizami, Abdul-Sattar & Murphy, Jerry D., 2010. "What type of digester configurations should be employed to produce biomethane from grass silage?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(6), pages 1558-1568, August.
    6. Murphy, J.D. & Power, N., 2009. "Technical and economic analysis of biogas production in Ireland utilising three different crop rotations," Applied Energy, Elsevier, vol. 86(1), pages 25-36, January.
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