Clean Technologies for Production of Valuable Fractions from Sardine Cooking Wastewaters

Pereira, Maria João; Grosjean, Oceane; Pintado, Manuela; Brazinha, Carla; Crespo, João

http://hdl.handle.net/10362/142842

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The increase in environmental consciousness and stricter regulations has motivated industries to seek sustainable technologies that allow valorising wastewaters, contributing to the profitability of overall processes. Canning industry effluents, namely sardine cooking wastewater, have a high organic matter load, containing proteins and lipids. Their untreated discharge has a negative environmental impact and an economic cost. This work aims to design an integrated process that creates value with the costly sardine cooking wastewater effluent. The research strategy followed evaluates coagulation/flocculation technologies as pre-treatment of the sardine cooking wastewater followed by reverse osmosis. Two different added-value products were obtained: a solid fraction rich in proteins, lipids (above 20%), and aromas that might be used for feed/pet/aquaculture applications and, from the processing of the resultant aqueous stream by reverse osmosis, a natural flavouring additive, which can be applied in food/feed. Additionally, the permeate from reverse osmosis presents a much lower organic load than the original raw material, which may be reused in the overall process (e.g., as water for washings) or discharged at a lower cost, with environmental benefits and economic savings.

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The research leading to these results has received funding from Sistema de Apoio à Investigação Científica e Tecnológica (SAICT), Programa de Actividades Conjuntas (PAC) under Multibiorefinery Project (POCI-01-0145-FEDER-016403) and from European Regional Development Fund (ERDF), through the Incentive System to Research and Technological Development, within the Portugal 2020 Competitiveness and Internationalization Operational Program under the project “MobFood–Mobilizing scientific and technological knowledge in response to the challenges of the agri-food market” (POCI-01-0247-FEDER-024524). Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.