Effects of nano-zerovalent iron on antibiotic resistance genes during the anaerobic digestion of cattle manure

Ma, Jiyue; Gu, Jie; Wang, Xiaojuan; Peng, Huiling; Wang, Qianzhi; Zhang, Ranran; Hu, Ting; Bao, Jianfeng

doi:10.1016/j.biortech.2019.121688

Cited by 71 publications

(14 citation statements)

References 45 publications

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“…Focusing on the utilisation of nZVI in AD systems, 5 out of the selected 14 publications stated that the presence of this nano-additive promoted the hydrolysis-acidification process by enhancing reduction of substrate and facilitated the availability of degradable biomass for anaerobic microorganisms (Abdelsalam et al, 2017b(Abdelsalam et al, , 2016bMa et al, 2019;Pan et al, 2019;Wang et al, 2018b). This is in agreement with the findings of Yu et al (2016), who observed increasing amounts of dissolved organic matter (DOM) species inside the sludge fermentation liquor amended with nZVI.…”

Section: Trace-element-based Nanoparticlessupporting

confidence: 69%

Impact of metallic nanoparticles on anaerobic digestion: A systematic review

Zhu

Blanco²,

Bhatti

et al. 2021

Science of The Total Environment

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Section: Trace-element-based Nanoparticlessupporting

confidence: 69%

Impact of metallic nanoparticles on anaerobic digestion: A systematic review

Zhu

Blanco²,

Bhatti

et al. 2021

Science of The Total Environment

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“…However, the reduction was quite variable, depending on the specific gene considered. For example, sul1 decreased from 60% up to 78% in some cases [ 53 , 54 ], but in others increased from 7% up to 63% [ 54 , 55 ]. The aac-(6′)-Ib-cr gene always lessened [ 53 , 55 ], in accordance with our results.…”

Section: Discussionmentioning

confidence: 99%

Anaerobic Digestion and Removal of Sulfamethoxazole, Enrofloxacin, Ciprofloxacin and Their Antibiotic Resistance Genes in a Full-Scale Biogas Plant

et al. 2021

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Anaerobic digestion is one of the best ways to re-use animal manure and agricultural residues, through the production of combustible biogas and digestate. However, the use of antibiotics for preventing and treating animal diseases and, consequently, their residual concentrations in manure, could introduce them into anaerobic digesters. If the digestate is applied as a soil fertilizer, antibiotic residues and/or their corresponding antibiotic resistance genes (ARGs) could reach soil ecosystems. This work investigated three common soil emerging contaminants, i.e., sulfamethoxazole (SMX), ciprofloxacin (CIP), enrofloxacin (ENR), their ARGs sul1, sul2, qnrS, qepA, aac-(6′)-Ib-cr and the mobile genetic element intI1, for one year in a full scale anaerobic plant. Six samplings were performed in line with the 45-day hydraulic retention time (HRT) of the anaerobic plant, by collecting input and output samples. The overall results show both antibiotics and ARGs decreased during the anaerobic digestion process. In particular, SMX was degraded by up to 100%, ENR up to 84% and CIP up to 92%, depending on the sampling time. In a similar way, all ARGs declined significantly (up to 80%) in the digestate samples. This work shows how anaerobic digestion can be a promising practice for lowering antibiotic residues and ARGs in soil.

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“…In AC, changes in physicochemical parameters had significant effects on bacterial succession ( Meng et al, 2019 ) and heat-intolerant bacteria (Enterobacteriaceae and Pseudomonas) were removed ( Gao et al, 2019 ). Although the mechanism underlying the change in bacterial flora in AD is complex and unclear, several studies have shown an increase in Clostridiales and Bacteroides ( Sun et al, 2016 ; Ma et al, 2019 ). These orders are strictly anaerobic and are involved in the process of methanogenesis.…”

Section: Discussionmentioning

confidence: 99%

“…However, it is difficult to encourage the universal use of AD by dairy farmers because of the associated costs. Some reports have suggested modifications of the treatment methods by using specific auxiliary material ( Zhang J. et al, 2019 ), by adding bacteria ( Duan et al, 2019 ) or composting additives ( Peng et al, 2018 ; Bao et al, 2019 ), or AD ( Ma et al, 2019 ) to reduce antibiotic resistance. Further investigations are needed to find better ways to prevent the spread of antimicrobial resistance in farms.…”

Section: Discussionmentioning

confidence: 99%

Aerobic Composting and Anaerobic Digestion Decrease the Copy Numbers of Antibiotic-Resistant Genes and the Levels of Lactose-Degrading Enterobacteriaceae in Dairy Farms in Hokkaido, Japan

et al. 2021

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Efficient methods for decreasing the spread of antimicrobial resistance genes (ARGs) and transfer of antimicrobial-resistant bacteria (ARB) from livestock manure to humans are urgently needed. Aerobic composting (AC) or anaerobic digestion (AD) are widely used for manure treatment in Japanese dairy farms. To clarify the effects of AC and AD on antimicrobial resistance, the abundances of antimicrobial (tetracycline and cefazolin)-resistant lactose-degrading Enterobacteriaceae as indicator bacteria, copy numbers of ARGs (tetracycline resistance genes and β-lactamase coding genes), and concentrations of residual antimicrobials in dairy cow manure were determined before and after treatment. The concentration of tetracycline/cefazolin-resistant lactose-degrading Enterobacteriaceae was decreased over 1,000-fold by both AC and AD. ARGs such as tetA, tetB, and blaTEM were frequently detected and their copy numbers were significantly reduced by ∼1,000-fold by AD but not by AC. However, several ARG copies remained even after AD treatment. Although concentrations of the majority of residual antimicrobials were decreased by both AC and AD, oxytetracycline level was not decreased after treatment in most cases. In addition, 16S rRNA gene amplicon-based metagenomic analysis revealed that both treatments changed the bacterial community structure. These results suggest that both AC and AD could suppress the transmission of ARB, and AD could reduce ARG copy numbers in dairy cow manure.

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Effects of nano-zerovalent iron on antibiotic resistance genes during the anaerobic digestion of cattle manure

Cited by 71 publications

References 45 publications

Impact of metallic nanoparticles on anaerobic digestion: A systematic review

Impact of metallic nanoparticles on anaerobic digestion: A systematic review

Anaerobic Digestion and Removal of Sulfamethoxazole, Enrofloxacin, Ciprofloxacin and Their Antibiotic Resistance Genes in a Full-Scale Biogas Plant

Aerobic Composting and Anaerobic Digestion Decrease the Copy Numbers of Antibiotic-Resistant Genes and the Levels of Lactose-Degrading Enterobacteriaceae in Dairy Farms in Hokkaido, Japan

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