Anaerobic Digestion by a Ceramic Mumbrane Enclosed Reactor

概要

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A reactor with an external pressure type ceramic membrane module was designed to complete a compact system which brings about a reduction of permeability power requirements. The applicability of the reactor to methane fermentation was examined using heat-treated liquor obtained from senage sludge. The experiments were carried out at 3 steps of CODcr-loading(Run 1; 4.53,Run 2;7.98,Run 3;15.4kg CODcr/m^3・d). The permeation flux stabilized at 0.06 in Run a and 0.11m^3/m^2・d in Run 2,where the membrane surface was backwashed with N_2 gas. In Run 3,the membrane surface was additionally washed by circulating the gas yielded by the fermentation to increase the permeation flux, which stabilized at 0.2m-3/m^2・d. The CODcr removal was 79.3 in Run 1,83.2 in Run 2,and 80.2% in Run 3,respectively. In all cases, the BOD removal exceeded 95%, and there was no significant difference in the gas yield, which was 0.41 to 0.43(l/g CODcr supplied)and 0.50 to 0.54(l/g CODcr decomposed). Since the BOD could be greatly reduced even at 0.6d of HRT and the microbiol cell concentration could be easily conrtolled, it seems possible to that the effciency of this reactor can be further improved.
社団法人日本生物工学会の論文
1991-02-25