Processing fish press waters using metallic and ceramic filtration

BACKGROUND The press juices resulting from a compacting operation on fish by‐products were subjected to a depuration treatment in order to reduce the high COD (120 g O2 L–1). The process included an initial de‐particulation step by means of two metallic filter cartridges of 465 µm and 250 µm, follow...

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Published in:Journal of chemical technology and biotechnology (1986) 2013-10, Vol.88 (10), p.1885-1890
Main Authors: Pérez-Gálvez, Raúl, Guadix, Emilia M., Bergé, Jean-Pascal, Guadix, Antonio
Format: Article
Language:English
Subjects:
Applied sciences
bioseparations
Byproducts
Chemical engineering
Crack opening displacement
Exact sciences and technology
Filter presses
Filtration
Fish
General purification processes
Life Sciences
Membrane separation (reverse osmosis, dialysis...)
Membranes
Pollution
Presses
Ultrafiltration
waste-water
Wastewaters
Water treatment and pollution
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Summary:BACKGROUND The press juices resulting from a compacting operation on fish by‐products were subjected to a depuration treatment in order to reduce the high COD (120 g O2 L–1). The process included an initial de‐particulation step by means of two metallic filter cartridges of 465 µm and 250 µm, followed by concentration with a 200 nm ultrafiltration ceramic membrane. The polishing efficiency of each unit was assessed in terms of COD and protein removal. RESULTS Dead‐end metallic filtration of the press waters reduced their suspended matter content by 28%, but achieved only 5.6% decrease in chemical oxygen demand (COD), which suggested further processing by membrane ultrafiltration. The de‐particulated stream was then subjected to ultrafiltration for 8 h in batch concentration mode, attaining a COD reduction of 87%. The observed flux of permeate was successfully fitted to a cake‐forming model adapted to cross‐flow filtration. The permeability of the fouled membrane was completely restored (99.87%) by a cleaning treatment comprising an alkali step with NaOH and a final disinfection with NaOCl. CONCLUSIONS The treatment proposed has proved to be a feasible technology, able to render a final permeate with reduced organic load. © 2013 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.4043