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Clean Technologies for Production of Valuable Fractions from Sardine Cooking Wastewaters: An Integrated Process of Flocculation and Reverse Osmosis

Author

Listed:
  • Maria João Pereira

    (LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, FCT NOVA, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal)

  • Oceane Grosjean

    (Polytech Nantes, GBP Department, Nantes University, 44306 Nantes, France)

  • Manuela Pintado

    (CBQF/Escola Superior de Biotecnologia, Universidade Católica Portuguesa, Rua Diogo Botelho 1327, 4169-005 Porto, Portugal)

  • Carla Brazinha

    (LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, FCT NOVA, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal)

  • João Crespo

    (LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, FCT NOVA, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal)

Abstract

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.

Suggested Citation

  • Maria João Pereira & Oceane Grosjean & Manuela Pintado & Carla Brazinha & João Crespo, 2022. "Clean Technologies for Production of Valuable Fractions from Sardine Cooking Wastewaters: An Integrated Process of Flocculation and Reverse Osmosis," Clean Technol., MDPI, vol. 4(2), pages 1-20, April.
    • Handle: RePEc:gam:jcltec:v:4:y:2022:i:2:p:16-295:d:794786
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    References listed on IDEAS

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    1. Cheila Almeida & Sofia Vaz & Friederike Ziegler, 2015. "Environmental Life Cycle Assessment of a Canned Sardine Product from Portugal," Journal of Industrial Ecology, Yale University, vol. 19(4), pages 607-617, August.
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