Abstract
The objective of this study was to investigate composting characteristics and odor emission control of semi-solid dairy manure from loose housing system in two-line treatment system of anaerobic digestion and composting after solid-liquid separation. By the separation, bulk density of the solid fraction from the manure was improved, but the contents of the persistent organic matter were increased. In the pilot-scale composting experiments, the same degree of the fermentation temperature and the decomposition of organic matter were observed in both of composting of the solid fraction obtained from the solid-liquid separation and the sawdust-added material to adjust the moisture content. During composing in two-line treatment system, total ammonia emission was reduced by 55 % and odor emission amount calculated by multiplying odor index equivalent value and air flow rate was reduced by 44.9 % and 37.2 % in first and second week, respectively, compared with composting of whole amount of the original manure.
