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http://dx.doi.org/10.17137/korrae.2017.25.2.59

Changes of Physico-chemical Characteristic on Swine Manure Using Different Suction Strength in Composting System  

Lee, Dong-Jun (National Institute of Animal Science (NIAS), RDA)
Kim, Jung Kon (National Institute of Animal Science (NIAS), RDA)
Jeong, Kwang-Hwa (National Institute of Animal Science (NIAS), RDA)
Kawg, Jung-Hoon (National Institute of Animal Science (NIAS), RDA)
Ravindran, B. (National Institute of Animal Science (NIAS), RDA)
Lee, Ji-Woong (Division of Animal Science, Chonnam National University)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.25, no.2, 2017 , pp. 59-67 More about this Journal
Abstract
The aim of this experiment was to investigate the effect of air suction rate (SR) during the composting process of swine manure mixed with sawdust used as a bulking agent. In the 25 L composting reactors, the suction rate (SR) was at four different treatment levels (100%, 200%, 300%, 400%), and were fixed on the based on constant aeration rate into the composting mixtures. The temperature reached to thermophilic phase within 2 days and it was maintained up to the $5^{th}$ day of the composting process in all reactors and then gradually decreased to room temperature at the end of the composting process. The moisture content (MC, %) of the initial mixtures was 64.27%, and it was reduced to 38.4, 33.08, 14.59 and 11.93 in the different suction rate of 100%, 200%, 300%, 400%, respectively in the end process. During the composting, the level of pH was increased from 6.83 to 8.67 and it gradually decreased to 7.56 in 100% and 200%(SR). At the same time, the pH values were reduced only up to 8.19 at 300%, and 8.08 at 400%(SR), showing that suction strengths of 100% and 200% were the better option for composting than those of 300% and 400%. The total Kjeldahl nitrogen (TKN) of initial composts mixtures was 2.3% and were changed in 3.3, 3.1, 2.5, and 2.3% at the end of the composting period from the 100%-400% (SR) variations respectively. These results also indicated that 100% and 200% (SR) were more affected by the dry mass loss as $CO_2$ and water evaporation. The initial value of C/N ratio was 25.17 and were significantly reduced to 11.88, 11.97, 14.31, and 14.72 at the end of the experiment, respectively from the 100%-400% (SR) variations. These results suggest that the suction rate (SR) of 100% and 200% relative to constant air supply would be the optimal conditions to produce high-quality compost.
Keywords
Air suction; Composting; Moisture Content (MC); Swine manure;
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Times Cited By KSCI : 4  (Citation Analysis)
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