To provide an energy-saving anaerobic treatment method and apparatus which can decompose an organic substance-containing liquid in a short time.
In the anaerobic treatment method for the organic substance-containing liquid, the organic substance-containing liquid L is charged into an anaerobic fermentation tank 1 having a fixed bed 6 to which an anaerobic microorganism group adheres, and a lower space 7 in which the anaerobic microorganism group can float and which is disposed under the fixed bed 6. The liquid L in the lower space 7 is agitated, and high-molecular organic substances in the liquid L in the lower space 7 are decomposed to low-molecular organic substances by the floating microorganism group while rotating the liquid L in the lower space 7 by the above agitation. While circulating the low-molecular organic substances in the liquid L in the lower space 7 by the agitation so as to pass through the fixed bed 6, they are decomposed to biogas G by the adhering microorganism group. Preferably, the bottom wall 1B of the fermentation tank 1 is formed in a hemisphere projecting downward to generate an agitation flow around a radial axis in the center of the inner surface of the bottom wall 1B. Preferably, a vertical flow-through passage 11 having a downward flow driving screw 12 therein is installed in the center of the fixed bed 6, and the low-molecular organic substances are circulated by the agitation flow R in the center of the inner surface of the bottom wall 1B and a downward flow D in the center of the fixed bed 6.
COPYRIGHT: (C)2005,JPO&NCIPI
Yoshiyuki Ueno
Masahiro Tada
Satoshi Yamazawa
Masashi Goto
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Reijiro Ichihigashi