Occurrence of antibiotic resistance genes in landfill leachate treatment plant and its effluent-receiving soil and surface water.
The antibiotic resistance genes (ARGs) from urban waste may spread to the environment with the discharge of leachate. Fifteen types of ARGs, including tetracycline, sulfonamides, AmpC β-lactamase and the class 1 integron gene were detected in the samples from the largest leachate treatment plant (LTP) in Guangzhou and its effluent receiving bodies (soil and surface water). The results showed that ARGs in leachates were in high levels and varied with seasons. The abundance of ARGs in the influent from high to low was in the turn of summer, winter, spring. About 2 to 4 orders of magnitude of ARGs were eliminated by the whole leachate treatment process. The predominant ARGs in the receiving soil were intI1, tetB, sul2, tetA and tetX, while those in the receiving surface water were sul2, intI1 and sul1, and the concentrations of ARGs in the receiving bodies were higher than those in the other natural bodies by 1 to 2 orders of magnitude. In addition, the results of bivariate correlation analysis showed that the abundances of ARGs (tetC, tetW, sul1, sul2, intI1 and FOX) were in significant correlation with the concentrations of heavy metals (Cu, Zn, Ni and Cr) (p < 0.05). LTPs are more likely to be sources of ARGs than wastewater treatment plant (WWTP) and need to be focused on.
['Zhang|Xiao-Hua|XH|', 'Xu|Yan-Bin|YB|', 'He|Xiao-Lin|XL|', 'Huang|Lu|L|', 'Ling|Jia-Yin|JY|', 'Zheng|Li|L|', 'Du|Qing-Ping|QP|']
D000900:Anti-Bacterial Agents D001419:Bacteria D001426:Bacterial Proteins D004352:Drug Resistance, Microbial D032023:Integrons D019216:Metals, Heavy D012987:Soil D012988:Soil Microbiology D062065:Waste Water D014867:Water D014874:Water Pollutants, Chemical D001618:beta-Lactamases
Landfill Antibiotics resistance genes (ARGs) Leachate treatment plants (LTPs) Receiving bodies Heavy metals