高層堆積通気法による工業的培養 : (VI) 堆積層の自由空間と圧縮性

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Among physical properties of heaps, through which air is passed in a relatively high velocity, the free space(or air space)quotient and the compressibility were thought to have direct bearing upon the efficitncy of aeration.The free space quotient, ε, is expressed in volumes of vacant space per packed volume of medium. And the compressibility is the decrement (Δl) of heap height caused by a load applied on the heap devided by the height (l) of unloaded heap.The quotient, ε, is related to the compressibility in that it is changed by a load applied on the top of the heap column.Supporting materials used in heap cultures, such as rice-hulls and saw-dust, have large ε-values and low compressibility.Generally, moistening and steaming of ordinary raw materials for heap culture decrease the ε-values remarkably and increase the compressibility of resulting heaps. There was observed the tendency that the compressibility and ε-value are decreased during incubation in rice-koji making.The above values obtained with various media and with cultures at various phases are given.
公益社団法人日本生物工学会の論文
1960-01-15