책임운영기관 농촌진흥청 국립축산과학원 (로고)

This study evaluated the effect of applying fermented liquid fertilizer to the pit of a pig barn on ammonia reduction and analyzed slurry characteristics to identify contributing factors. The experiment was conducted in a mechanically ventilated facility, with 32 pigs per group. Two groups were compared: a control group using water and a treatment group using fermented liquid fertilizer as circulating liquid. Before the experiment, an amount of circulating liquid equivalent to 50% of the expected manure for 21 days was pre-poured into the pit. After 21 days, the slurry was discharged and replaced with new circulating liquid. Ammonia concentrations were measured in real time inside the barn and at the exhaust outlet. Emission rates from exhaust fan were calculated based on ventilation data. Weekly slurry samples were analyzed for physicochemical properties and microbial communities. Results showed that ammonia concentration from inside the barn of the treatment group decreased by up to 33.3%, and the emission rate from exhaust fan dropped by up to 26.2% compared to the control. Annually, ammonia emissions were reduced by 27.3%. This reduction was linked to a 36.1% decrease in the volatilization of free ammonia from ammoniacal nitrogen in the slurry. The reduction was further attributed to increased microbial diversity, which suppressed the dominance of protein-degrading S. alactolyticus, thereby limiting ammonical nitrogen accumulation. In conclusion, applying fermented liquid fertilizer effectively reduced ammonia emissions by preventing the buildup of ammoniacal nitrogen in slurry. These results demonstrate a 27.3% reduction in the annual ammonia emission factor in pig facilities, providing scientific evidence to support policy initiatives targeting ammonia mitigation in livestock facilities.