The relationship between the degradation process
of organic materials and the degree of its maturities
in the commercial composting facility.
1. Objectives The objectives of this study are that
(1) to measure using the new quantitative method, the amount of residual organic materials in samples picked up in the course of the degradation process of the commercial composting facility and
(2) to examine using growth test of Komatsuna (Brassica compestris), the relationship between the degradation process of organic materials and the degree of its maturities.
2. Experiments
2.1 Compost samples
Two kind of samples were used as follows.
(1) The Nejime Compost Center, JA-Kagoshima Kimotsuki. (referred as N-center)
Raw materials were the garbage and the dung.
(2) The Recycle Center, Unkai Brewing Co., Ltd. (referred as U-center)
Raw materials were the dreg of potato etc. (the byproduct of a liquor, sho-chu)
Fig.1 shows the picking-up places of samples and those fermentation time. (passed time)
[ Reference written by Murakami Corporation]
Hoeibussan (referred in the End) explains that the processing step, that is the type of N-center or that of U-center is decided by bulkiness and/or moisture content of processing wastes.
3. Results and discussion
3.1 The PH and the moisture content of compost samples (N-center)
3.2 The quantities of CO2 generated from samples (N-center) during re-composting
3.3 The estimated percentage of the degradation ratio
3.4 The growth test of Komatsuna (Brassica campestris)
The figure shows the results from the growth test using three samples. (N-4, N-7 and U-6)
The relative growth means 
REF means the test made by using a fertilizer.
CTRL means the test made by using a chemical fertilizer.
4. Conclusions
The following conclusions are confirmed.
(1) Regarding N-center. The sample No. N-4 (passed day, 25) shows that
① the degradation of raw materials was almost completed and
② the degradated material had no harmful effects for cultivating produces and could be used as a high efficient fertilizer.At the Nejime Center, the current commercial degradation period is 45 days and the compost product has good qualities more than that of the sample No. N-4.
(2) Regarding U-center. The degradated material treated 41-47 days as compost had similar qualities to that of N-center in spite of the different degradation process and also the different degradation ratio.
[The End written by Murakami Corporation]
Hoei Bussan has granted to use its composting technology for JA-Kagoshima Kimotuski and Unkai Brewing Co., Ltd.Murakami Corporation summarized and translated into English, a paper(in Japanese) presented by Nakasaki, et al. at the 14th annual meeting of Japan Society of Waste Management Experts on 22 October 2003 in Tsukuba City, Japan on its own responsibility.
Reference
Nakasaki, K. and Nagasaki, K. Department of Materials Science and Chemical Engineering, Faculty of Engineering SHIZUOKA UNIVERSITY. : The relationship between the degradation process of organic materials and the degree of its maturities in the commercial composting facility (in Japanese), presented at Proceeding of 14th annual meeting of Japan Society of Waste Management Experts, pp. 370-372 (2003).
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