Impact and Mechanistic Pathways of Humification Degree on the Nitrogen Removal Efficiency of Cattle Manure Straw Compost Extracts
Abstract
as an efficient organic fertilizer. Its degree of humification directly affects the chemical composition of compost extracts and their performance
in wastewater nitrogen removal. In this study, compost extracts from different humification stages were selected as research subjects to comprehensively analyze the effects of humification on the structure of dissolved organic matter (DOM), functional group composition, and electron-donor characteristics. The study also explores the electron-transfer pathways and microbial regulation mechanisms involved in biological
denitrification. Results show that as humification deepens, the proportions of humic acid and fulvic acid in the extracts increase, aromaticity is
enhanced, and electron-transfer activity improves, thereby promoting electron transmission during denitrification and increasing total nitrogen
removal efficiency. Further analysis indicates that polyphenolic and quinone-like substances formed during humification can function as "electron shuttles, " accelerating nitrate reduction and improving system-level nitrogen removal. This research clarifies the regulatory mechanisms
through which humification influences the denitrification performance of compost extracts and provides theoretical support for the integrated
application of agricultural waste resource utilization and ecological wastewater remediation technologies.
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DOI: http://dx.doi.org/10.70711/itr.v3i1.8226
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