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  • 1.
    Pechsiri, Joseph Santhi
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Ganguly, Srirupa
    University of Illinois.
    Ng, T.Y.S
    University of Illinois.
    Gröndahl, Fredrik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Malmström, Maria
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Preliminary assessment of simultaneous mixotrophic production of Tetraselmis tetrathele and treatment of saline wastewater from aquacultureManuscript (preprint) (Other academic)
    Abstract [en]

    Interest in industrial-scale cultivation of microalgae biomass has increased in recent years, due to its potential in phytochemicals, wastewater treatment, and aquaculture feed. Previous studies have focused on freshwater systems and phototrophic microalgae growth. In this study, preliminary observations were performed on mixotrophic growth of Tetraselmis tetrathele in crude unaltered saline wastewater and its nutrient removal and aquaculture feed potential. The wastewater was obtained directly from a Pacific white shrimp farm. The results showed successful phototrophic and mixotrophic growth of Tetraselmis tetrathele in saline wastewater, with maximum specific growth rate of approximately 0.2 day-1. Some nutrient removal was achieved (phosphate), and use of biomass as feed for shrimp aquaculture are further discussed.

  • 2.
    Pechsiri, Joseph Santhi
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Song, X
    Faculty of Biosciences, Fisheries and Economics, The Arctic University of Norway, 9037 Tromsø, Norway.
    Malmström, Maria
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Cheng, Jun
    State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027 Hangzhou, PR China.
    Cen, Kefa
    State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027 Hangzhou, PR China.
    Gröndahl, Fredrik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Energy Analysis of the Nannochloropsis sp. Production as an Alternative Protein Source using the Holistic ep-EROIManuscript (preprint) (Other academic)
    Abstract [en]

    Energy systems analysis and greenhouse gas (GHG) emissions of open pond microalgae cultivation systems is attracting considerable interest in the past decade due to their potentials for the production of biofuels and phytochemicals. However, there has been little discussion on energy systems analysis of microalgae produced from power plant flue gas and its use as an alternative protein source. This study aims to analyze edible protein energy return on investment (ep-EROI) and the overall GHG emissions for a medium-to-large scale Nannochloropsis oceanica cultivation system using power plant flue gas in northern China. Besides, additional benefits of the microalgae cultivation system were assessed on the overall nutrient recovery potential of the harvested biomass. Results of the study indicated that cumulative energy demand and GHG emissions for production of Nannochloropsis oceanica products were intermediate to other conventional protein sources in the literature, such as fish. Results of the EROI-based analysis showed that the Nannochloropsis oceanica cultivation system achieved a moderate ep-EROI of 0.11.

  • 3.
    Pechsiri, Joseph Santhi
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.
    Thomas, Jean Baptiste E.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.
    Risén, Emma
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology. Currently at Sweco Environment AB, Sweden.
    Ribeiro, Mauricio S.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.
    Malmström, Maria E.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.
    Nylund, G. M.
    Jansson, A.
    Welander, U.
    Pavia, H.
    Gröndahl, Fredrik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.
    Energy performance and greenhouse gas emissions of kelp cultivation for biogas and fertilizer recovery in Sweden2016In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 573, p. 347-355Article in journal (Refereed)
    Abstract [en]

    The cultivation of seaweed as a feedstock for third generation biofuels is gathering interest in Europe, however, many questions remain unanswered in practise, notably regarding scales of operation, energy returns on investment (EROI) and greenhouse gas (GHG) emissions, all of which are crucial to determine commercial viability. This study performed an energy and GHG emissions analysis, using EROI and GHG savings potential respectively, as indicators of commercial viability for two systems: the Swedish Seafarm project's seaweed cultivation (0.5 ha), biogas and fertilizer biorefinery, and an estimation of the same system scaled up and adjusted to a cultivation of 10 ha. Based on a conservative estimate of biogas yield, neither the 0.5 ha case nor the up-scaled 10 ha estimates met the (commercial viability) target EROI of 3, nor the European Union Renewable Energy Directive GHG savings target of 60% for biofuels, however the potential for commercial viability was substantially improved by scaling up operations: GHG emissions and energy demand, per unit of biogas, was almost halved by scaling operations up by a factor of twenty, thereby approaching the EROI and GHG savings targets set, under beneficial biogas production conditions. Further analysis identified processes whose optimisations would have a large impact on energy use and emissions (such as anaerobic digestion) as well as others embodying potential for further economies of scale (such as harvesting), both of which would be of interest for future developments of kelp to biogas and fertilizer biorefineries.

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