AI Article Synopsis
- Denitrification during composting poses environmental pollution risks and harms aromatic humic substances, necessitating better regulation.
- This study tested two regulation methods—moisture control and biochar amendment—on chicken manure composting, revealing both methods significantly reduced nitrogen levels and improved humic substance quality.
- Microbiological analysis showed that these methods suppressed denitrifying microbes and their related genes, which play a role in aroma degradation, highlighting the importance of both biological interactions and environmental factors in composting practices.
Article Abstract
Denitrification during composting is a hidden danger that causes environmental pollution risk and aromatic humic substance damage, which needs to be better regulate urgently. In this study, two denitrification regulation methods, moisture and biochar amendment, were conducted during chicken manure composting. Denitrification performance data showed two regulation methods obviously reduced NO-N, NO-N and N contents. Humic substance increased by 25.3 % and 29.1 % under two regulations. Microbiological analysis indicated that two regulation methods could decreasing denitrifying functional microbes with aroma degradation capability. Subsequently, denitrification gene narG, nirS, nosZ were significantly inhibited (p < 0.05) and the aromatic degradation metabolism pathways were down-regulated. Correlation analysis further revealed the important influence of interspecific interactions and non-biological characteristics on functional microbes. These results provided important scientific basis to denitrification regulation in the practice of composting, which achieved the purpose of simultaneously controlling environmental pollution risk and conducing end-product formation.
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| http://dx.doi.org/10.1016/j.biortech.2021.125901 | DOI Listing |
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