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Pechsiri, Joseph SanthiORCID iD iconorcid.org/0000-0003-4181-0571
Publications (3 of 3) Show all publications
Pechsiri, J. S., Thomas, J. B., Risén, E., Ribeiro, M. S., Malmström, M. E., Nylund, G. M., . . . Gröndahl, F. (2016). Energy performance and greenhouse gas emissions of kelp cultivation for biogas and fertilizer recovery in Sweden. Science of the Total Environment, 573, 347-355
Open this publication in new window or tab >>Energy performance and greenhouse gas emissions of kelp cultivation for biogas and fertilizer recovery in Sweden
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2016 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 573, p. 347-355Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Biorefinery, Economy of scale, Energy return on investment (EROI), EURED GHG savings, Saccharina latissima, Swedish macroalgae cultivation, Anaerobic digestion, Biofuels, Biogas, Economics, Fertilizers, Gas emissions, Investments, Refining, Seaweed, Biorefineries, Energy return on investments, Macro-algae, Greenhouse gases
National Category
Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-195182 (URN)10.1016/j.scitotenv.2016.07.220 (DOI)000390071000032 ()2-s2.0-84983638479 (Scopus ID)
Funder
Swedish Research Council, 2013-11209-24630-54
Note

QC 20161118

Available from: 2016-11-18 Created: 2016-11-02 Last updated: 2019-10-04Bibliographically approved
Pechsiri, J. S., Song, X., Malmström, M., Cheng, J., Cen, K. & Gröndahl, F.Energy Analysis of the Nannochloropsis sp. Production as an Alternative Protein Source using the Holistic ep-EROI.
Open this publication in new window or tab >>Energy Analysis of the Nannochloropsis sp. Production as an Alternative Protein Source using the Holistic ep-EROI
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(English)Manuscript (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.

National Category
Environmental Sciences
Research subject
Industrial Ecology
Identifiers
urn:nbn:se:kth:diva-261360 (URN)
Note

QC 20191004

Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-04Bibliographically approved
Pechsiri, J. S., Ganguly, S., Ng, T., Gröndahl, F. & Malmström, M.Preliminary assessment of simultaneous mixotrophic production of Tetraselmis tetrathele and treatment of saline wastewater from aquaculture.
Open this publication in new window or tab >>Preliminary assessment of simultaneous mixotrophic production of Tetraselmis tetrathele and treatment of saline wastewater from aquaculture
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(English)Manuscript (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.

National Category
Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-261366 (URN)
Note

QC 20191004

Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-04Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4181-0571

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