Bioaugmentation on humification during co-composting of corn straw and biogas slurry. (April 2023)

• Record Type: Journal Article
• Authors: Cao, Zhenglei; Deng, Fang; Wang, Ruxian; Li, Jiabao; Liu, Xiaofeng; Li, Dong
• Is Part Of: Bioresource technology. Volume 374(2023)
• Publication Date: 2023-04
• Subjects: Bioaugmentation -- Co-composting -- Biogas slurry -- Corn straw -- Humification pathway; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2023.128756
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: 2.5 L biogas slurry can be consumed by the co-composting with 1 kg straw. Bioaugmentation enhanced the Maillard and polyphenol humification pathways. The strengthening effect of bacteria was more significant than that of biochar. Bioaugmentation reduced the loss of C and N by promoting the formation of CN of HA. The humified co-compost had nutrient slow-release effect in agricultural production. Abstract: In order to increase the nutrients and humic acid (HA) contents of corn straw (CS) derived organic fertilizer and recover resources from biogas slurry (BS) simultaneously, the co-composting of CS and BS was carried out with the addition of biochar and microbial agents including lignocellulose degrading and ammonia assimilating bacteria. The results showed that 1 kg straw could treat 2.5 L BS by recovering nutrients and bio-heat introduced evaporation. The bioaugmentation strengthened both the polyphenol and Maillard humification pathways by promoting the polycondensation of precursors (reducing sugars, polyphenols, and amino acids). HA obtained in the microbial-enhanced group (20.83 g/kg), biochar-enhanced group (19.34 g/kg), and combined-enhanced group (21.66 g/kg) were significantly higher than that in the control group (16.26 g/kg). The bioaugmentation achieved directional humification and reduced the loss of C and N by promoting the CN formation of HA. The humified co-compost had nutrient slow-release effect in agricultural production.