title: Elimination of veterinary antibiotics and antibiotic resistance genes from swine wastewater in the vertical flow constructed wetlands.
abstract: This paper investigated the efficiency of two vertical flow constructed wetlands characterized by volcanic (CW1) and zeolite (CW2) respectively, at removing three common antibiotics (ciprofloxacin HCl, oxytetracycline HCl, and sulfamethazine) and tetracycline resistance (tet) genes (tetM, tetO, and tetW) from swine wastewater. The result indicated that the two systems could significantly reduce the wastewater antibiotics content, and elimination rates were in the following sequence: oxytetracycline HCl>ciprofloxacin HCl>sulfamethazine. The zeolite-medium system was superior to that of the volcanic-medium system vis-à-vis removal, perhaps because of the differing pH values and average pore sizes of the respective media. A higher concentration of antibiotics accumulated in the soil than in the media and vegetation, indicating that soil plays the main role in antibiotics removal from wastewater in vertical flow constructed wetlands. The characteristics of the wetland medium may also affect the antibiotic resistance gene removal capability of the system; the total absolute abundances of three tet genes and of 16S rRNA were reduced by 50% in CW1, and by almost one order of magnitude in CW2. However, the relative abundances of target tet genes tended to increase following CW1 treatment.
authors: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
authors: Lin
authors: L
authors: Liu
authors: Chaoxiang
authors: C
authors: Liu
authors: Jiayu
authors: J
authors: Zheng
authors: Xu
authors: X
authors: Huang
authors: Zhen
authors: Z
authors: Wang
authors: Yuhong
authors: Y
authors: Liu
authors: Gefu
authors: G
authors: Zhu
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000900:Anti-Bacterial Agents / Q000032:analysis*; D004352:Drug Resistance, Microbial / Q000235:genetics*; D052918:Environmental Restoration and Remediation / Q000379:methods; D013552:Swine; D019155:Veterinary Drugs / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry* / Q000382:microbiology; D014874:Water Pollutants, Chemical; D053833:Wetlands
chemical_list: D000900:Anti-Bacterial Agents; D019155:Veterinary Drugs; D062065:Wastewater; D014874:Water Pollutants, Chemical