Nanofiltration of wastewaters from the fish meal industry

The wastewaters generated in the fish meal industry, a water-intensive industry, contain a high organic load comprising a significant amount of proteins. Therefore, they should not be discharged without a suitable treatment in order to prevent negative impacts in the environment, and allow the recov...

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Bibliographic Details
Published in:Desalination 2003-01, Vol.151 (2), p.131-138
Main Authors: Afonso, Maria Diná, Bórquez, Rodrigo
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Ceramic membranes
Ceramics
Chile
Cleaning
Decontamination
Desalination
Discharge
Ecological effects
Effluents
Environment
Environmental impact
Exact sciences and technology
Filtration
Fish meal wastewaters
Food industries
Fouling
Fundamental and applied biological sciences. Psychology
General aspects
Industrial wastes
Industrial wastewaters
Membranes
Nanofiltration
Pollution
Pollution abatement
Pollution and sludges
Proteins recovery
Recycling
Streams
Temperature
Washing
Wastewater treatment
Wastewaters
Water reuse
Water treatment and pollution
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Summary:The wastewaters generated in the fish meal industry, a water-intensive industry, contain a high organic load comprising a significant amount of proteins. Therefore, they should not be discharged without a suitable treatment in order to prevent negative impacts in the environment, and allow the recovery of high added value products. The effluent generated in a fish meal plant located in Talcahuano, Chile, was characterized, and pre-treated by microfiltration (MF) cartridges in series (80, 20 and 5 μm). A multi-channel ceramic membrane of 1 kDa MWCO, Kerasep NanoN01A, was used in the nanofiltration (NF) experiments. The operating conditions were optimised in total recycling mode, and the subsequent concentration experiment was carried out at 4 bar, 4 m/s, ambient temperature and natural pH. The results from this work clearly show that NF is an efficient and ecologically suited environmental technology for decontamination and recycling of the wastewaters generated during the fish meal production, as it allows both the recycle of water (permeate stream) and proteins (concentrate stream) into the fish meal process, besides environmental pollution abatement. Although the membrane undergoes severe fouling, it can be effectively cleaned through a basic-acid washing cycle.
ISSN:0011-9164
1873-4464
DOI:10.1016/S0011-9164(02)00991-8