Cross-Flow Filtration of Methane Fermentation Broth by Ceramic Membranes

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With a view t concentrating the microorganisms in thermophilic methane fermentation broth, we studied the characteristics of cross-flow filtration, using tubular ceramic membranes in liquid single-phase, gas-liquid two-phase and gas-liquid-solid three-phase flow system. The following results were obtained : (i) an asymmetric membrane with smaller pore diameter and lower premeate resistance gave higher permeate flux, (ii) by the promotion of turbulence in the gas-liquid mixture in a two-phase flow system, the permeate flux was increased with an increase in the feed-gas flow rate, and its was of a sastisfactorily high value, (iii) a cake layer was irreversibly formed on the membrane surface, behaving as a self-rejective dynamic membrane. In excessive cross-flow and/or abrasive conditions, plugging was found likely to occur because of destruction of the dynamic membrane, and the flux was lowered as a consequence, and (iv) the critical flux existed under a low transmembrane pressure of about 50 kPa.
公益社団法人日本生物工学会の論文
1989-09-25