Insight into the effects of sulfamethoxazole and norfloxacin on nitrogen transformation functional genes during swine manure composting. (February 2020)

• Record Type: Journal Article
• Authors: Chen, Zhiqiang; Wu, Yiqi; Wen, Qinxue; Bao, Huanyu; Fu, Qiqi
• Is Part Of: Bioresource technology. Volume 297(2020)
• Publication Date: 2020-02
• Subjects: Antibiotics -- Composting -- Nitrogen transformation -- Functional genes; 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.2019.122463
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Antibiotics decreased bacterial amoA and nxrA while increased nosZ / nirK. Decline in amoA increased NH3 emission by 11.42% and 24.46% in SMZ and NOR. Decrease in nxrA enhanced NO2 − -N content and N2 O emission in SMZ. Increase in nosZ / nirK led to lower N2 O emission in SN in cooling phase. Abstract: The effects of sulfamethoxazole and norfloxacin on nitrogen functional genes were investigated in four composting treatments of swine manure: CK (no antibiotics), SMZ (spiked with 5 mg kg −1 dry weight (DW) sulfamethoxazole), NOR (spiked with 5 mg kg −1 DW norfloxacin), and SN (spiked with 5 mg kg −1 DW sulfamethoxazole and 5 mg kg −1 DW norfloxacin). Antibiotics decreased relative abundance of bacterial amoA and nxrA, while increased nosZ / nirK . The decline in amoA /16S rRNA increased the total NH3 emission in SMZ and NOR from 1027.05 to 1144.39 and 1278.22 mg kg −1 DW. The decrease of nxrA /16S rRNA enhanced the NO2 − -N content and N2 O emission in SMZ in the initial composting. Additionally, the increase in nosZ / nirK probably was the main reason for the lower N2 O emission in SN than other treatments in the cooling phase. The inhibition on nitrification process and increase in NH3 emission resulted from antibiotics is worthy of attention in the future.