Distribution of antibiotic resistance genes (ARGs) in anaerobic digestion and land application of swine wastewater

Effects of chlortetracycline and copper on tetracyclines and copper resistance genes and microbial community during swine manure anaerobic digestion

“…These results were opposite to results of the research (LaPara and Diehl, 2010), which demonstrated that tetA and intl1 could be effectively removed from the municipal wastewater solids and decreased by more than one order of magnitude at the end of the 37°C mesophilic anaerobic digestion. Sui et al (2016) investigated the distribution of ARGs in swine wastewater anaerobic digestion and the results showed that tetX was effectively removed but intl1 was barely reduced after the mesophilic anaerobic digestion. These reduction differences of intl1 and ARGs might be caused by different substrates (e.g., swine manure, sewage sludge), inoculums, or different operating conditions, and further investigation is needed.…”

“…Wu et al (2016) reported that the acidogenic phase of thermophilic digestion was mainly responsible for reducing the ARGs, such as tetA, tetG, tetX, sul1, ermB, dfrA1, dfrA2 and intI1, while the subsequent methanogenic phase caused a rebound in their quantity; thermophilic digestion could effectively decrease the ARGs and mesophilic one could barely reduce the ARGs. In the study of Sui et al (2016), mesophilic anaerobic digestion obviously reduced the ARGs and the reduction efficiency was improved by stable operational temperature and longer solid retention time (SRT). However, few studies investigated whether reduction efficiencies of ARGs, as well as HMRGs and MGEs would be affected by different external pressures (including antibiotics and heavy metals) during anaerobic digestion.…”

Effects of graphene oxide on the performance, microbial community dynamics and antibiotic resistance genes reduction during anaerobic digestion of swine manure

“…Considering the huge amounts of swine manure, anaerobic digestion (AD) was widely adopted due to its effectiveness on the pathogens removal, volume reduction and resource utilization, especially the biogas production, and luckily, it was demonstrated that AD could also realize some ARGs reduction in swine manure (Youngquist et al, 2016). But the digestate still contributed a lot to the spread and proliferation of ARGs in the environment (Sui et al, 2016) and there was much space for the improvement of AD efficiency (Astals et al, 2012), which indicated that some work could be done to simultaneously enhance the AD efficiency and ARGs removal.…”

Detection, Occurrence and Fate of Emerging Contaminants in Agricultural Environments

“…Sui et al (2016) examined the distribution of ARGs during the process of anaerobic digestion (AD) followed by land application of swine wastewater. The ARGs of tetracycline ( tet (G), tet (M) and tet (X)), sulfonamide ( sul (1) and sul (2)), and macrolide ( erm (B), erm (A), ere (A) and mef (A)) were detected in high abundance ( >108 copies mL −1 ) in swine wastewater and digested liquor.…”