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Energy balance of algal biomass production in a 1-ha “Green Wall Panel” plant: How to produce algal biomass in a closed reactor achieving a high Net Energy Ratio

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  • Tredici, M.R.
  • Bassi, N.
  • Prussi, M.
  • Biondi, N.
  • Rodolfi, L.
  • Chini Zittelli, G.
  • Sampietro, G.

Abstract

The annual productivity of Tetraselmis suecica in a 1-ha Green Wall Panel-II (GWP-II) plant in Tuscany (Italy) is 36t (dry weight)ha−1year−1, which corresponds to an energy output of 799GJha−1year−1. The energy inputs necessary to attain that productivity amount to 1362GJha−1year−1, mainly given by the embodied energy of the reactor (about 30%), mixing (about 40%), fertilizers (11%) and harvesting (10%). The Net Energy Ratio (NER) of T. suecica production is thus 0.6. In a more suitable location (North Africa) productivity nearly doubles, reaching 66tha−1year−1, but the NER increases only by 40% and the gain (difference between output and inputs) remains negative. In a GWP-II integrated with photovoltaics (PV), the NER becomes 1.7 and the gain surpasses 600GJha−1year−1. Marine microalgae cultivation in a GWP plant, in a suitable location, can attain high biomass productivities and protein yields 30times higher than those achievable with traditional crops (soya). When the GWP reactor is integrated with PV, the process attains a positive energy balance, which substantially enhances its sustainability.

Suggested Citation

  • Tredici, M.R. & Bassi, N. & Prussi, M. & Biondi, N. & Rodolfi, L. & Chini Zittelli, G. & Sampietro, G., 2015. "Energy balance of algal biomass production in a 1-ha “Green Wall Panel” plant: How to produce algal biomass in a closed reactor achieving a high Net Energy Ratio," Applied Energy, Elsevier, vol. 154(C), pages 1103-1111.
    • Handle: RePEc:eee:appene:v:154:y:2015:i:c:p:1103-1111
    DOI: 10.1016/j.apenergy.2015.01.086
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