Enhancement of composting process by the addition of chicken manure and rice bran to tree pruning chips
2003
Tajima, K. (Tokyo Univ. of Agriculture (Japan)) | Yoshimura, M. | Kato, M. | Tatsuno, J. | Tamaki, K.
Shortening the composting time for tree pruning chips obtained in urban areas is important in reducing the area required for composing. We have developed several composting techniques over the last ten years. According to our study, using the closed-type reactor with the intermittent aeration effectively enhanced composting of secondary-crushed wood chips under the initial condition of 60% (w.b.) moisutre content without turning the compost pile. In this paper, the effects of amendments on composting of secondary-crushed wood chips were examined using a small-scale reactor (0.125 m sup 3 with the intermittent aeration (aeration: 30 min with 30 L min. sup(-1) and 60 minites interruption). The composting amendments used for this study were chicken manure, rice bran, rice bran & chicken manure and control (no amendment). From this experiment, we obtained the following results. l ) The amendment of rice bran & chicken manure had the highest rate of decomposition. 2 ) The chicken manure amendment rapidly increased the temperature of material in the early stage, and the rice bran amendment maintained material decomposition in the mid-stage of composting. 3 ) The C-N ratio of composting material amended with rice bran & chicken manure reduced 3 points, compared to the rice bran amendment. 4 ) The moisture loss of composting material due to the temperature rise was dependent on the type of amendment Optimizing the aeration quantity of each amendment may allow composting material to be continuously decomposed.
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