The application of ultrasound for cleaning of membranes employed in the dairy industry | Ciscenje membrana u industriji mleka primenom ultrazvuka
2008
Popovic, S.S., Univerzitet u Novom Sadu, Novi Sad (Serbia). Tehnoloski fakultet | Lukic, N.Lj., Univerzitet u Novom Sadu, Novi Sad (Serbia). Tehnoloski fakultet | Jaramazovic, Z.I., Univerzitet u Novom Sadu, Novi Sad (Serbia). Tehnoloski fakultet | Sijacki, I.M., Univerzitet u Novom Sadu, Novi Sad (Serbia). Tehnoloski fakultet
Membrane separation processes are widely employed in the dairy industry. Negative aspect membrane filtration application is flux reduction due to the deposits formation in general, especially on whey proteins filtration. Membranes used in the dairy industry are cleaned frequently in order to regenerate the permeate flux. This paper describes cleaning procedure of ceramic tubular membranes (50 and 200 nm mean pore size) fouled with whey proteins employing combination of chemical agents and ultrasound. Ultrasound cleaning efficiency and influence of concentration of different cleaning agents on flux recovery were investigated. The caustic solution and the commercial detergents P3-Ultrasil 67 and P3-Ultrasil 69 were used as chemical cleaning agents. The ultrasound had frequency of 35 kHz. In the case of 50 nm membrane, flux recovery was not improved by ultrasound application. In the case of 200 nm membrane, the ultrasound cleaning improved flux recovery, especially if detergent was used. The optimal detergent concentration was combination of 0.25% (w/w) Ultrasil P3 67 and 0.4% (w/w) Ultrasil P3 69. Namely, the forementioned combination produced efficiency of 91% after 15 min of cleaning and 15 min of rinsing with distilled water.
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