Energetic and Economic Evaluation of Zero-Waste Fish Co-Stream Processing

Kęstutis Venslauskas, Kęstutis Navickas, Marja Nappa, Petteri Kangas, Revilija Mozūraitytė, Rasa Šližytė and Vidmantas Župerka
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Kęstutis Venslauskas: Institute of Energy and Biotechnology Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania
Kęstutis Navickas: Institute of Energy and Biotechnology Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania
Marja Nappa: VTT Technical Research Centre of Finland Ltd., 02150 Espoo, Finland
Petteri Kangas: VTT Technical Research Centre of Finland Ltd., 02150 Espoo, Finland
Revilija Mozūraitytė: SINTEF Ocean, 7010 Trondheim, Norway
Rasa Šližytė: SINTEF Ocean, 7010 Trondheim, Norway
Vidmantas Župerka: Institute of Energy and Biotechnology Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania

IJERPH, 2021, vol. 18, issue 5, 1-16

Abstract: This study evaluates the possibility of recovery of high-quality valuable fish oil and proteins from fish co-streams by traditional means or a combination of several technologies. A techno-economically feasible and sustainable zero-waste process is needed for full utilisation of this co-stream’s potential. This study aims to determine the energy efficiency and economic feasibility of four different zero-waste bio-refineries based on salmon filleting co-streams. The study covers four concepts: (I) biogas and fertiliser production from salmon co-streams, (II) fish silage production, (III) thermal processing of salmon co-streams for producing oil, protein concentrate, and meal, and (IV) novel two-stage thermal and enzymatic process for producing high-quality oil and protein hydrolysate, while the solid residue is converted to biogas and fertilisers. Monte Carlo simulation is used to evaluate uncertainties in economic evaluation. The results show that the two-stage processing of fish co-streams leads to recovery of both high-quality marine oil and proteins, showing the largest profitability and return on investment during the economic analysis. It is a more tempting option than the currently used thermal treatment or traditional silage processes. The possibility of producing food-grade fish protein hydrolysate is the biggest benefit here. Concepts studied are examples of zero-waste processing of bioproducts and illustrate the possibilities and benefits of fully utilising the different fractions of fish as fillets, oil, protein, fertilisers, and energy production.

Keywords: salmon; co-stream; fish protein hydrolysate; biogas; modelling (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:18:y:2021:i:5:p:2358-:d:507703

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