파일럿 규모 톱밥 깔짚 혼합 젖소분뇨 퇴비화에서 대두 과산화효소의 악취 저감 효과 평가

Pilot scale evaluation of soybean peroxidase for reducing odorous gas emissions during dairy manure solids and sawdust bedding mixture composting

Wardhani Riuh1, 신진호1, 이승훈2, Fufa Abera Jabessa1, 송용우3, 김동여3, 김수현1, 박성준3, 이종옥4, 안희권4*

Riuh Wardhani1, Jinho Shin1, Seunghun Lee2 , Abera Jabessa Fufa1, Yongwoo Song3, SeongJun Park3, Heekwon Ahn4*

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

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

2Institute of Agricultural Science, Chungnam National University, Daejeon, Korea

3Dept. of Livestock Environmental Science & Technology, Chungnam National University, Daejeon, Korea

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

*교신저자: 안희권(hkahn@cnu.ac.kr)

Odorous emissions are a significant environmental concern in livestock manure composting, with ammonia (NH3), volatile sulfur compounds (VSCs), volatile fatty acids (VFAs), and volatile organic compounds (VOCs) contributing to air pollution and nutrient loss. Soybean peroxidase (SBP), a by-product of soybean hull processing, has demonstrated potential for reducing odor-causing compounds through oxidative polymerization. While previous studies have shown SBP’s effectiveness in slurry systems, its performance under aerobic composting conditions remains underexplored. This pilot-scale study evaluated the effectiveness of a single SBP application in mitigating odor emissions during composting of dairy manure solids and sawdust bedding. SBP was applied at 8% (dry basis) of the compost mixture on day one and compared to a control without SBP addition. Over a 50 day composting period, SBP treatment significantly reduced NH3 emissions by 41.6% (p<0.05). Although total VSC concentrations increased, key odorants within this group including hydrogen sulfide and dimethyl disulfide (DMDS) were reduced by 64.0% and 90.7%, respectively (p<0.05). Phenol emissions were also significantly reduced by 46.9%, and total VFAs decreased by 18.0% (p=0.06). The mitigation effect of SBP may be attributed to changes in physicochemical properties and microbial structure within the compost matrix, including lowered pH and enhanced enzymatic activity, which likely contributed to reduced NH3 and phenol volatilization. Further research is needed to assess the feasibility of scaling up SBP application under field conditions and to evaluate its cost-effectiveness for commercial composting operations in the real world setting. These findings highlight the potential of peroxidase rich food processing by products as practical and sustainable additives for reducing odor emissions during manure composting

*키워드(Keywords): Soybean peroxidase, VOCs, Ammonia, emission.

*사사(Acknowledgment): This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry (IPET) through the Livestock Industrialization Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (MAFRA) (RS-2021-IP321088).