For the modeling basis of microbiological hydrolysis of organic solids, hydrolyzed quantity per unit time and unit surface area, namely hydrolytic flux was defined, and the hydrolytic models for estimating weight decrease of cubic and spherical organic-solids were derived. These models were verified and actual values of hydrolytic rate coefficients were obtained by the experiments, in which three sizes of cubic organic solid samples were made from each of rice cake, albumen congealed by heat, and beef tallow, submerged in reactors, and anaerobically hydrolyzed. Because the quantity of MLSS cannot correctly express that of the microbe in such reaction systems, the action of active anaerobe was estimated and evaluated based on ATP, in this study.

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