Modified cornstalk biochar can reduce ammonia emissions from compost by increasing the number of ammonia-oxidizing bacteria and decreasing urease activity. (January 2021)

• Record Type: Journal Article
• Authors: Zhou, Shizheng; Wen, Xin; Cao, Zhen; Cheng, Ran; Qian, Yuliang; Mi, Jiandui; Wang, Yan; Liao, Xindi; Ma, Baohua; Zou, Yongde; Wu, Yinbao
• Is Part Of: Bioresource technology. Volume 319(2021)
• Publication Date: 2021-01
• Subjects: Composting -- Layer manure -- Biochar -- Ammonia -- Nitrogen functional gene; 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.2020.124120
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: 10% H2 O2 modified cornstalk biochar (CB) could reduce NH3 emissions by 61.69%. The addition of modified CB increased the number of AOB, inhibited urease activity. The modified CB reduced NH3 emissions by regulating nitrification processes. Abstract: This study examined how the addition of modified cornstalk biochar (CB) affected ammonia (NH3 ) emissions during composting. Four treatments were established, including a control (CK) with layer manure and sawdust only, and the CK mixtures adding 10% HNO3 CB (NA), 10% H2 O2 CB (HP) and 10% HNO3 – H2 O2 CB (MI). As the results showed, NH3 emissions was reduced by 47.83% (NA), 61.69% (HP) and 45.69% (MI) when the modified CB used as a compost additive ( P < 0.05). According to the data analysis, the addition of modified CB significantly increased the number of ammonia-oxidizing bacteria (AOB), inhibited urease activity and decreased the abundance of nar G and nir S at rising temperatures and high temperatures ( P < 0.05). Redundancy analysis demonstrated a negative correlation between NH3 emissions and AOB and a positive correlation with urease activity, nar G and nir S. Thus, the modified CB helped reduce NH3 emissions by regulating nitrification processes.