Processing fish press waters using metallic and ceramic filtration

Type Article
Date 2013-10
Language English
Author(s) Perez-Galvez Raul1, Guadix Emilia M.1, Berge Jean-PascalORCID2, Guadix Antonio1
Affiliation(s) 1 : Univ Granada, Dept Ingn Quim, E-18071 Granada, Spain.
2 : IFREMER, Lab Sci & Technol Biomasse Marine, F-44311 Nantes, France.
Source Journal Of Chemical Technology And Biotechnology (0268-2575) (Wiley-blackwell), 2013-10 , Vol. 88 , N. 10 , P. 1885-1890
DOI 10.1002/jctb.4043
WOS© Times Cited 1
Keyword(s) membranes, waste-water, bioseparations, filtration
Abstract 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
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