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Research progress on transfer effect of antibiotic resistance gene in swine wastewater treatment process

YANG Lizhen;LIU Tianqi;WANG Lulu;CAO Yunyun;ZHOU Wenbing;XIAO Naidong;CAI Jianbo;College of Resources and Environment,Huazhong Agricultural University/The Cooperative Innovation Center for Sustainable Pig Production Co-Sponsored by Province and Ministry;  
Antibiotic resistance genes(ARGs)in the aquatic environment have become one of the global health problems,and swine farm is one of the most important sources of ARGs in the environment,and the discharge of swine wastewater is the main channel for ARGs to enter the environment.At present,the environmental effect of ARGs from swine wastewater is not clear,the research on ARGs removal by different swine wastewater treatment processes is still in the initial stage,which needs more in-depth and detailed study to explore treatment methods that could reduce the abundance of ARGs in swine wastewater.In this paper,the process of ARGs from production to entry into the environment and the current status of ARGs pollution in swine farms were reviewed.The distribution and removal efficiency of ARGs in swine wastewater treatment processes were introduced with emphasis on different wastewater treatment methods(activated sludge method,anaerobic biological treatment method,physical and chemical method,constructed wetland method),and it was concluded that physical and chemical method is the most promising way to reduce ARGs pollution in swine farming environment.The researchers also gained insight into treatments that might reduce the amount of ARGs in swine wastewater. This paper summarized the occurrence and transmission of ARGs in the process of swine reproduction.The distribution,migration and transformation of antibiotic resistance genes in swine wastewater during different treatment processes were analyzed,and the mechanism of environmental factors affecting its transmission was elucidated.Finally,based on the shortcomings of the current pig wastewater treatment process in the removal of ARGs,the feasible suggestions of optimizing the treatment process and strengthening the monitoring of ARGs in each process were put forward.
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