Abstract

Aerobic composting is an effective method for treating livestock and poultry manure. However, traditional aerobic composting often results in nitrogen loss and excessive N2O gas pollution in the atmosphere. In this study, metagenomics technology was used to investigate the co-metabolism of sulfur and nitrogen in composting with Na2S as an additive. The results showed that the content of nitrate and sulfate in the experimental group (T) was 19% and 34% higher, respectively, than that in the control group (CK) after composting maturation. The denitrification genes (narG, narH, nirK, and norB) and sulfur reduction gene (sat) in T were significantly inhibited, particularly on the fourth day. Actinobacteria and Proteobacteria were the dominant bacteria involved in sulfur and nitrogen co-metabolism. These findings indicated that the addition of Na2S effectively inhibits denitrification in composting, reducing N2O emissions and nitrogen loss, while increasing sulfate content and improving the quality of composting.

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