Fermentation properties of cow manure with water content adjusted using a vacuum dryer, and quality characteristics of the compost produced
2005
Serizawa, S.(Shizuoka-ken. Animal Husbandry Experiment Station, Fujinomiya (Japan)) | Mochizuki, K. | Sato, K. | Katayama, N.
Vacuum drying is one method to adjust the water content of manure for composting. To clarify the effectiveness of this method, we adjusted the water content of manure from milk cows to 70% both in a vacuum drier and by mixing with sawdust. This manure was then composted by placing 11 l each in a small experimental composter. We also investigated composting by dairy farmers who used a vacuum dryer to adjust water content. The results showed that fermentation temperature tended to be significantly higher for cow manure with water content adjusted using a vacuum dryer than for cow manure in which water content was adjusted using sawdust. In addition, at 3 weeks the organic material had decreased and stabilized in both the small composter experiment and the dairy farmer investigation. This manure showed improvements in germination rate and root length index, which indicate the degree of decomposition, after accumulation for 1-2 weeks, and it was judged that the compost could be used at 1 month. Adjustment of water content using a vacuum dryer has a lower processing cost than adjustment with sawdust. Moreover, since the volume of processed material is smaller after adjustment and the composting period can be shortened, it is thought that this method will allow for a smaller area to be used for composting facilities, and that it will be an effective new method for compost regulation.
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