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http://dx.doi.org/10.17137/korrae.2022.30.4.109

Changes in Characteristics of Semi-cured Pig Manure Liquid Fertilizer according to the Storage Duration and Aeration  

Jeong, Kwang-Hwa (Animal Environment Division, National Institute of Animal Science)
Park, Hoe-Man (Postharvest Engineering Division, National Institute of Agricultural Sciences)
Lee, Dong-Jun (Animal Environment Division, National Institute of Animal Science)
Kim, Jung-Kon (Animal Environment Division, National Institute of Animal Science)
Kim, Hyunjong (Animal Environment Division, National Institute of Animal Science)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.30, no.4, 2022 , pp. 109-122 More about this Journal
Abstract
Currently, most of the pig manure generated from pig farms in Korea is in the form of a slurry with a moisture content of about 97%. Pig manure slurry is a mixture of pig manure and cleaning water in the pig house. In this study, changes in properties of pig manure liquid fertilizer according to whether air was supplied or not and with the passage of storage period were analyzed for 120 days. During the experimental period, the degree of maturity of the pig manure liquid fertilizer was higher in the experimental closed batch reactors supplied with air than in the same type reactors not supplied with air. As the liquid fertilizer storage period elapsed, there was a tendency that liquid fertilizer was converted to a state of complete maturity. In the batch reactor in which air was supplied, the moisture content of pig manure slurry, which had a moisture content of 97.90%, was reduced to 96.82% at the end of the experiment. On the other hand, the moisture content in the reactor without air was reduced to 97.33%. The pH of the liquid fertilizer, which was 8.82 at the start of the experiment, changed to 7.57 in the reactor with air supplied and 8.75 in the reactor without air at the completion of the experiment. The nitrogen content in the liquid fertilizer was 0.198 mg/L on average at the start of the experiment and it was lowered to 0.076 mg/L in the air supplied reactor at the end of the experiment. On the other hand, the nitrogen content of the liquid fertilizer was lowered to 0.121 mg/L in the reactor to which air was not supplied. The phosphoric acid (P2O5) concentration in the liquid decreased higher in the liquid fertilizer filled in the reactor without air than the liquid fertilizer filled in the reactor with air supplied as the storage period elapsed. Considering the experimental results, it is considered that the quality of pig manure liquid fertilizer is improved when air is supplied to pig manure slurry and the storage period of pig manure slurry is longer.
Keywords
Aeration; Liquid fertilizer; Maturation; Pig manure slurry; Storage period;
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Times Cited By KSCI : 1  (Citation Analysis)
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