Screening and Identification of SOB and Its Effect on the Reduction in H 2 S in Dairy Farms

Yuang Cao, Shuhao Yu, Keqiang Zhang, Xiaoyu Xu, Khinkhin Phyu, Suli Zhi () and Junfeng Liang ()
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Yuang Cao: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Shuhao Yu: Beijing Capital Air Environmental Science & Technology Co., Ltd., Beijing 100176, China
Keqiang Zhang: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Xiaoyu Xu: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Khinkhin Phyu: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Suli Zhi: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Junfeng Liang: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China

Sustainability, 2025, vol. 17, issue 8, 1-15

Abstract: The problem of the foul odor caused by H 2 S in livestock farms has become a major complaints. In this study, optimal sulfur-oxidizing bacteria (SOB) strains were screened from dairy farm wastewater and the adjacent soil for odor treatment. The strains and physiological functions were determined by identification and genome comparison, and the optimal operating conditions were determined by experiments under different conditions. The identification results showed that the strain that had the highest homology with Halomonas mongoliensis was Halomonas sp. AEB2. The comparative genomic results showed that the average nucleotide identity and DNA–DNA hybridization value were 95.8% and 68.6%, respectively. The optimization results were as follows: sodium succinate-carbon (10 g/L) and ammonium chloride-nitrogen (0.07 g/L). The optimal operating conditions were as follows: seeding rate 4%, temperature 30 °C, stirring speed 90 rpm, and pH 8. The oxidation products of AEB2 were mainly elemental sulfur and tetrathionate, and the metabolic pathway of AEB2 was constructed accordingly. This study suggests a feasible path to reduce H 2 S emissions from dairy farms, and it provides theoretical support for the restoration of livestock environment and sustainability.

Keywords: sulfur-oxidizing bacteria; biological deodorization; Halomonas; heterotrophic oxidation; oxidation pathway; sustainability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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