자돈 분뇨의 휘발성 지방산 발생 특성 및 환경개선제가 휘발성 지방산 발생에 미치는 영향에 관한 연구

The volatile fatty acids are presented as the major odor of the pig manure, and this 4 kinds materials(propionic acid, nbutyric acid, i-valeric acid, n-valeric acid) are included in 22 legal malodorous compounds in Korea. This research analyzed the emission characteristics of VFAs produced from first time weaner`s manure and effect of the food additives on the emission of VFAs for the efficacy assessment of the additives which is used in order to solve the malodor problem of the piggery. The analysis of the 5 kinds of VFAs (propionic acid, n-butyric acid, i-valeric acid, n-valeric acid, and i-butyric acid)using alkali beads method was performed for seven experimental weeks with triplicate. Each of manures (3 kg) produced from six experimental groups (one kind of control and five kinds of experiments) were collected every week and were put in each the odor generating chamber. Malodorous compounds generated for 6 hours in the chambers were sampled with the absorption tube packed with glass beads from the headspace. The concentration of total volatile fatty acids (TVFAs) in control group was 797.7 ppbv, and all experimental groups fed with environmental improving agents were reduced 13.8 ~ 49.0% as compared to the control group. The concentration of propionic acid, i-butyric acid, n-butyric acid, i-valeric acid, and n-valeric acid of control group were 233.5, 74.4, 291.6, 69.6, and 128.7 ppbv, respectively. Maximumreduction rates of each compound in the experimental groups showed 91.6, 92.3, 94.2, 94.5, and 81.8%, respectively.