92 / 2023-07-13 20:06:18

Research on the mechanism of various methods to inhibit the emission of hydrogen sulfide during composting

Composting,Hydrogen sulfide,Microbial communities,Sulfur,Sulfur metabolism

Composting has become an important way to utilize agricultural waste effectively. The emission of sulfur-containing malodorous gases during this intense biodegradation process is considered a major challenge that hinders composting development and environmental pollution. Among them, hydrogen sulfide (H₂S) accounts for a high percentage of volatile sulfur compounds, and large emissions pose a risk to ambient air quality and the health of surrounding residents. Therefore, it is crucial to control the reduction of sulfur losses in the form of H₂S during composting to reduce environmental pollution and to increase the sulfur content of organic fertilizers. At present, emissions can be reduced by modifying external parameters, including initial moisture content, ventilation rate, and bulking agent. These factors are interrelated and can affect aeration space and oxygen transport. This can lead to changes in the microbial communities, affecting the abundance and function of core microorganisms. This paper summarizes the treatment methods to inhibit H₂S emissions and analyzes the combined effects on the microbial communities. Finally, the development and application of treatment technologies for inhibiting H₂S emissions are prospected and suggested, providing a new perspective for sulfur fixation to promote fertilization and rational disposal of various solid wastes such as livestock manure to reduce atmospheric pollution.