Effects of H3PO4 modified biochar on heavy metal mobility and resistance genes removal during swine manure composting. (February 2022)

• Record Type: Journal Article
• Authors: Chen, Zhiqiang; Bao, Huanyu; Wen, Qinxue; Wu, Yiqi; Fu, Qiqi
• Is Part Of: Bioresource technology. Volume 346(2022)
• Publication Date: 2022-02
• Subjects: Swine manure -- Modified biochar -- Composting -- Heavy metals -- Antibiotic resistance genes (ARGs); 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.2021.126632
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: BP promoted Cu and Zn immobilization via formation of phosphate precipitation. Total ARG abundance notably decreased by 66.21% with BP addition. The decrease of ARG in BP was related to the change in microbial community. BP addition in composting could reduce the spread risk of HMs and ARGs. Abstract: In this research, static composting treatments of swine manure with forced ventilation were conducted to study the effects of biochar (BC) and H3 PO4 modified biochar (BP) addition on heavy metals (HMs) stabilization, profiles of antibiotic resistance genes (ARGs), heavy metals resistance genes (MRGs) and bacterial communities during swine manure composting. After 42 days of the composting, compared to control (CK), BC and BP decreased the concentration of diethylenetriamine pentaacetic acid extractable Cu and Zn by 12.04%, 15.15% and 26.91%, 36.50%, respectively. Furthermore, BC and BP treatments reduced the total abundances of nine ARGs by 4.02% and 66.21%, and five MRGs by 53.66% and 58.81%, compared to CK in the compost product. Network analysis and square structural equation model analysis revealed that the decrease of ARGs and MRGs in BP treatment was related to the change in bacterial community during the composting, rather than differences in co-selection pressure.