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Lactic Acid Production in a Membrane Bioreactor System with Thermophilic Bacillus coagulans: Fouling Analysis of the Used Ceramic Membranes

: Fan, R.; Ebrahimi, M.; Quitmann, H.; Czermak, P.


Separation science and technology 50 (2015), No.14, pp.2177-2189
ISSN: 0149-6395
Journal Article
Fraunhofer IME ()

In lactic acid fermentation broth systems, membrane fouling is characterized as the crucial factor in limiting ceramic membrane life-time and efficiency. This study aimed to find the limiting factor of this process and seek an effective solution. By quantitative analysis using resistance-in-series model, the cake layer resistance is demonstrated to be the dominant factor in a steady state. A cake compressibility index was measured as high as 2.09. Within the low transmembrane pressure range, the cake resistance was manipulated through crossflow velocity regulation to achieve a better membrane performance. A new correlation between flux and cell density was also introduced.