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Wastewater generated as a result of the fish brining process has a very high contamination load. Application of appropriate technologies of wastewater treatment in order to reuse it in the production process once the NaCl content has been supplemented can provide an alternative to its costly recycling. The experiment included ultrafiltration tests conducted on waste brine originating from food processing industry. The results of physicochemical tests indicated very high reductions of fat content (100%) and turbidity (99.8%). Reductions were also revealed in the case of other indicators, i.e., chemical oxygen demand, biochemical oxygen demand, protein and histamine content: by 24.4, 35.2, 27.6 and 22.7%, respectively. Furthermore, it was reported that the obtained permeate retained its quality and microbiological stability. The studied ultrafiltration (UF) process can be successfully used for recirculation of brine in salted fish processing, and at the same time constitute an easily monitored critical control point in the hazard analysis and critical control point (HACCP) system.

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Abstract:The aim of the study was to analyze and assess the possibility of using a two-stage fi ltration system with ceramic membranes: a 3-tube module with 1.0 kDa cut-off (1 st stage) and a one-tube module with 0.45 kDa cut-off (2 nd stage) for treating effl uent water from a juvenile African catfi sh aquaculture. The study revealed that during the 1 st fi ltration stage of the effl uent water, the highest degrees of retention were obtained with respect to: suspended solids SS (rejection coeffi cient R I =100%), turbidity (R I =99.40%), total iron (R I =89.20%), BOD 5 (R I =76.0%), nitrite nitrogen (R I =62.30%), and COD Cr (R I =41.74%). The 2 nd fi ltration stage resulted in a lower reduction degree of the tested indicators in comparison to the 1 st fi ltration stage. At the 2 nd stage, the highest values of the rejection coeffi cient were noted in for the total iron content (R IV =100%), COD Cr (R IV =59.52%; R V =64.28%, R VI =63.49%) and turbidity (R IV and R V = 45.0%, R VI =50.0%). The obtained results indicate that ceramic membranes (with 1.0 and 0.45 kDa cut-offs) may be used in recirculation aquaculture systems as one of the stages of effl uent water treatment.