대두 과산화효소를 이용한 젖소 분뇨 퇴비화 과정 중 발생되는 악취 저감

Reducing odorous compounds from dairy manure composting using soybean peroxidase

Wardhani Riuh1, 신진호1, 이주미2, 이승훈3, 김동여2, 송용우2, 이태구2, 안희권4*

Riuh Wardhani, Jinho Shin, Jumi Lee, Seunghun Lee, Dongyeo Kim, Yongwoo Song, Tegu Lee Heekwon Ahn*

1충남대학교 낙농학과, 2충남대학교 축산환경학과, 3충남대학교 농업과학연구소, 4충남대학교 동물자원과학부

1Dept. of Dairy Science, Chungnam National University, Daejeon, Korea

2Dept. of Livestock Environmental Science & Technology, Chungnam National University, Daejeon, Korea

3Institute of Agricultural Science, Chungnam National University, Daejeon, Korea

4Division of Animal and Dairy Science, Chungnam National University, Daejeon, Korea

*교신저자: 안희권(hkahn@cnu.ac.kr)

Composting is a promising approach for managing organic materials such as livestock manure by converting them into valuable organic fertilizers. However, composting is also associated with the release of odorous gases, including ammonia (NH3), volatile sulfur compounds (VSCs), volatile fatty acids (VFAs), and volatile organic compounds (VOCs). Previous studies have demonstrated that the use of soybean peroxidase (SBP) combined with calcium peroxide (CaO2) can effectively reduce odor emissions, including NH3 (14.6–22%) and skatole (44–72.6%) during the storage of pig slurry in slurry pits. This study aimed to evaluate the effectiveness of SBP combined with CaO2 in mitigating odor emissions during dairy manure composting. Three composting treatments were tested: a control (SBP residue), a split-dose of SBP+CaO2 application (Treatment 1), and a single-dose of SBP+CaO2 application (Treatment 2).

The results indicated that both treatment groups significantly reduced NH3 emissions compared to the control. Treatment 2, involving a single dose, achieved a 19.3% reduction in overall measured NH3 emissions, while Treatment 1, with a split dose, resulted in a 13.4% reduction (p<0.05). SBP likely decreases pH, thereby preventing NH3 volatilization, and may catalyze biochemical reactions that transform nitrogen compounds such as NH3. Additionally, both treatments significantly reduced phenol emissions, with reductions of 29.8% in Treatment 2 and 15.5% in Treatment 1 (p<0.05). The role of peroxidase in polymerizing phenolic compounds is known to reduce their volatility. No significant differences were observed in VSCs and VFAs, emissions across the treatments.

These findings suggest that SBP, particularly in combination with CaO2, effectively reduces NH3 and phenol emissions during dairy manure composting, offering a promising strategy for improving air quality in livestock manure management.

*키워드(Keywords): Soybean peroxidase, odor mitigation, ammonia emission.

*사사(Acknowledgment): The study supported by Livestock Industrialization Technology Development Program by Ministry of Agriculture, Food and Rural Affairs (MAFRA)(RS-2021-IP321088).