Effects of addtional waste paper on the pattern of composting with dairy manure
1999
Ichikawa, A. (Aichi-ken. Agricultural Research Center, Nagakute (Japan)) | Nakatani, H. | Kato, H. | Masuda, T. | Kano, M. | Kawabe, T.
We conducted an experiment to examine effects of additional waste paper (WP) and sawdust for adjustment moisture on the pattern of composting with dairy manure. The dairy manure obtained from dairy free-stall housing were mixed with WP and/or sawdust in the ratio of 1:1.5 (volume). WP used in this experiment was crushed by machines and the dairy manure contained about 86% water. Five composting treatments were prepared; 1) the dairy manure mixed with WP (1.0 : 1.5 in volume); 2) the dairy manure mixed with WP and the sawdust (1.0 : 1.0 : 0.5); 3) the dairy manure mixed with WP and the sawdust (1.0 : 0.75 : 0.75); 4) the dairy manure mixed WP and the sawdust (1.0 : 0.5 : 1.0); 5) the dairy manure mixed with the sawdust (1.0 : 1.5). These raw materials (composts) were fermented in the composting boxes (150L) maintained under aerobic condition by blowing air from the bottom during 8 weeks. Although the compost mixed with only WP had lower temperature than the other composts during initial fermentation period (1th week), it had the similar pattern of temperature change to the other composts since 2nd week. During the experiment period, the decreasing rates of piling volume, organic matter content, combustion energy and water content in composts were strengthed with increasing the rate of WP in the composting materials . These results indicated that WP mixed with dairy manure obstructed aeration for composting, but its decomposition rate was higher more than that of sawdust in the composting process. Therefore, on the using of WP to adjust moisture for composting dairy manure, it is more effective to mix with sawdust
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