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J Environ Manage

Title:		"Impact of Bacillus subtilis on manure solids, odor, and microbiome"
Author(s):		Hwang O; Yun YM; Trabue S;
Address:		"National Institute of Animal Science, Rural Development Administration, 1500, Kongjwipatjwi-Ro, Iseo-Myeon, Wanju-Gun, Jeollabuk-Do, 55365, Republic of Korea. Department of Environmental Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-Gu, Cheongju, 28644, Republic of Korea. USDA-Agriculture Research Service, National Laboratory for Agriculture and the Environment, 1015N. University Boulevard, Ames, IA, 50011, United States. Electronic address: steven.trabue@usda.gov"
Journal Title:		J Environ Manage
Year:		2023
Volume:		20230207
Issue:
Page Number:		117390 -
DOI:		10.1016/j.jenvman.2023.117390
ISSN/ISBN:		1095-8630 (Electronic) 0301-4797 (Linking)
Abstract:		"A study was conducted to determine the effectiveness of supplementing swine manure with Bacillus subtilis (BS) to improve digestion of manure solids and lower odor emission. Large bioreactors (400 L) with manure (100 L) were treated with commercially available BS at a rate of 1% manure volume by either directly pouring or surface spraying the manure with inoculum. Manure physicochemical properties, gas emissions, and microbiome were monitored. Manures treated multiple times with BS or surface sprayed had significantly (P < 0.05) lower electrical conductivity, volatile solids, and chemical oxygen demand, by 3-5% compared to non-treated control manures. Volatile sulfur compound emissions (VSCs) were reduced by 20-30% in both experiments, while ammonia and volatile organic compounds were reduced by 40% and 15%, respectively, in surface spray experiment only. The manure indigenous microbiome remained relatively stable following treatment and BS were never detected in the raw or treated manure following multiple treatments. The reduction in manure organic carbon and VSCs emissions were a result of physical mixing during manure treatment and biological material in the microbial inoculum stimulating microbial activity and not growth of BS"
Keywords:		Swine Animals *Manure Bacillus subtilis Odorants Ammonia/analysis *Microbiota Sulfur Sulfur Compounds Microbial additives Microbial community Odor Swine manure;
Notes:		"MedlineHwang, Okhwa Yun, Yeo-Myeong Trabue, Steven eng England 2023/02/10 J Environ Manage. 2023 May 1; 333:117390. doi: 10.1016/j.jenvman.2023.117390. Epub 2023 Feb 7"