Abstract
The proper conditions for the practical treatment were investigated with many experimental results which had been shown in our previous report as to the pig and cattle waste.
1. The value of lnk′ was obtained, when the parameter n of eq. (1) was fixed on n′. Regression line of k′ formed a line for a series of experimental conditions, So lnk′ was regarded as an index of the characteristics of compressive dehydration.
2. Moisture content of the sample after a practical short operation was obtained from eq. (1) by using the value of n′ and lnk′, The proper conditions were studied by obtaining the moiture contents after 5 and 30 seconds,
3. The authors obtained the following results as the practical characteristics for the compressive dehydration of animal waste.
a) The moisture content after 5 seconds of operation showed a large drop, but the one after 30 secods had almost the same value as after 5 seconds.
b) Dehydration in the case of Pre-coat condition and thin layer condition decreased the moisture so low as the waste's being available for a compost.
c) The effect of the pressure increase on the cattle waste was larger than the effect on the pig waste. When the pressure was more than 9kgf/cm2, the effect of the dehydration was large for the thin layer condition.
d) The effect of the compression velocity on the dehydration was hardly recognized.
4. Dry matter contents of the effluent were around 0.2g/cm3 for the pig waste except for the pre-coat condition (Fig. 10 and 11). The mean value of all condition was 0.04g/cm3 for the cattle waste (Fig. 12 and 13).
