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Using the sulfide-oxidizing bacterium Geobacillus thermodenitrificans to restrict H2S release during chicken manure
Xiaohua Wu1, Jiahui Wan1, Qingda Wang1
1State Key Laboratory of Microbial Technology, Shandong University, Qingdao, 266200, PR China.
Journal of Environmental Management
|February 26, 2024
Summary
This study introduces Geobacillus thermodenitrificans DSM465 as a novel solution to reduce toxic hydrogen sulfide (H2S) emissions during chicken manure composting. The bacteria efficiently oxidize H2S, improving compost quality and environmental safety.
Area of Science:
- Environmental Microbiology
- Biotechnology
- Waste Management
Background:
- Hydrogen sulfide (H2S) is a toxic gas released during chicken manure composting.
- Efficient and cost-effective methods are needed to mitigate H2S emissions.
- Heterotrophic bacteria offer potential for H2S oxidation, but their environmental applications are underexplored.
Purpose of the Study:
- To investigate the H2S oxidation activity of the heterotrophic thermophilic bacterium Geobacillus thermodenitrificans DSM465.
- To evaluate the efficacy of G. thermodenitrificans DSM465 in reducing H2S release during chicken manure composting.
- To explore the potential of G. thermodenitrificans DSM465 for environmental applications in waste management.
Main Methods:
- Characterization of the H2S oxidation pathway in G. thermodenitrificans DSM465, involving sulfide:quinone oxidoreductase (SQR) and persulfide dioxygenase (PDO).
- Quantification of H2S oxidation rates by G. thermodenitrificans DSM465.
- Application of G. thermodenitrificans DSM465 in chicken manure composting to monitor H2S emissions and compost composition.
Main Results:
- G. thermodenitrificans DSM465 demonstrated rapid H2S oxidation, reaching rates of 5.73 μmol min⁻¹·g⁻¹ cell dry weight.
- H2S emission during composting was reduced by 27.5%.
- Sulfate content in the final compost increased by 34.4%, and the thermophilic phase was extended by 7 days.
Conclusions:
- G. thermodenitrificans DSM465 is an effective and economical agent for controlling H2S release in chicken manure composting.
- This study presents a novel strategy for environmentally friendly waste composting.
- Heterotrophic H2S-oxidizing bacteria show promising applications in environmental improvement.
