• Agricultural and Biosystems Engineering
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• v.1 no.1
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• pp.54-58
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• 2000

In order to investigate the compost process and the evaporating phenomenon, a rotary reversing compost system has been tested in a swine farm. During the summer season, the compost temperature was varied in the range of 50~$60^{\circ}C.$ and the ash content was increased by 12.8 % with the average of 24.7 % at the end of phase. In the winter season, the compost temperature was varied in the range of 40~$57^{\circ}C.$ and the ash content was increased to 8.5 % showing the average of 18 % at the end of phase. In summer, the compost facility could handle all of the animal waste, but it could not handle 1/4~1/3 of the animal excrement during the winter. The required amount of sawdust by this method could be reduced to 1/3 than that of the mixing method at the beginning of compost process.

• Journal of Environmental Health Sciences
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• v.38 no.2
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• pp.151-158
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• 2012

Objectives: Bioaerosols released by treating organic-waste resources cause a variety of environmental and hygiene problems. The objective of this study was to investigate the distribution characteristics of the airborne bacteria emitted from a pig manure composting plant, a principal site for organic-waste resource facilities. Methods: Three types of pig manure composting plant were selected based on fermentation mode: screw type, rotary type and natural-dry type. Each site was visited and investigated on a monthly basis between September 2009 and August 2010. A total of 36 air samplings were obtained from the pig manure composting plants. The air sampling equipment was a six-stage cascade impactor. Quantification and qualification of airborne bacteria in the air samples was performed by agar culture method and identification technique, respectively. Results: The mean concentrations of airborne bacteria in pig manure composting plant were 7,032 (${\pm}1,496$) CFU $m^{-3}$ for screw type, 3,309 (${\pm}1,320$) CFU $m^{-3}$ for rotary type, and 5,580 (${\pm}1,106$) CFU $m^{-3}$ for natural dry type. The screw type pig manure composting plant showed the highest concentration of airborne bacteria, followed by the natural dry type and the rotary type. The ratio of respirable to total airborne bacteria was approximately 40-60%. The predominant genera of airborne bacteria identified were Micrococcus spp., Staphylococcus spp. and Escherichia spp. Conclusion: Monthly levels of airborne bacteria were highest in August and lowest in November regardless of fermentation mode. There was no significant correlation relationship between airborne bacteria and environmental factors such as temperature, relative humidity and particulate matters in pig manure composting plants.

• Journal of the Korea Organic Resources Recycling Association
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• v.22 no.4
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• pp.28-44
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• 2014

Due to development of the national economy growth, livestock goods consumption has rapidly increased over the past 30 years. It has led livestock breeders to increase their livestock numbers. An increased number of livestock have consequently resulted in an increasing animal feces generation. According to the agricultural statistics provided by the Bureau of Statistics, livestock manure amounts to 47,235 thousand tons in 2013. To treat livestock manure, various types of treatment facilities like composting, liquid fertilization, purification, and anaerobic digestion facilities are being applied. In composting facility, there are four kinds of agitation system: escalator, paddle, screw and rotary type. In case of liquid fertilization process, there are two types of system: aeration and anoxic type. There are about 8,000 liquid fertilization facilities for treatment livestock manure in Korea. For purification of livestock manure, the treatment process is divided by three steps: Solid/Liquid separation process, Secondary purification process and advanced oxidation process. About 21 thousand tons of livestock manure was treated by anaerobic digestion facility in 2012. In every type of facility for livestock manure treatment, it is very important to choose the optimal deodorization equipment for the livestock manure treatment facility. In this study, the investigation has been carried out for six years to analyse the characteristics of livestock manure treatment facilities and related technique of Korea.