title: Removal of veterinary antibiotics from sequencing batch reactor (SBR) pretreated swine wastewater by Fenton's reagent.
abstract: The large-scale application of veterinary antibiotics in livestock industry makes swine wastewater an important source of antibiotics pollution. This work investigated the degradation of six selected antibiotics, including five sulfonamides and one macrolide, by Fenton's reagent in swine wastewater pretreated with sequencing batch reactor (SBR). The dosing mode and practical dosage of Fenton's reagent were optimized to achieve an effective removal of antibiotics while save the treatment cost. The effects of initial pH, chemical oxygen demand (COD) and suspended solids (SS) of the SBR effluent on antibiotics degradation were examined. The results indicate that the optimal conditions for Fenton's reagent with respect to practical application were as follows: batch dosing mode, 1.5:1 molar ratio of [H(2)O(2)]/[Fe(2+)], initial pH 5.0. Under the optimal conditions, Fenton's reagent could effectively degrade all the selected antibiotics and was resistant to the variations in the background COD (0-419 mg/L) and SS (0-250 mg/L) of the SBR effluent. Besides, Fenton's reagent helped to not only remove total organic carbon (TOC), heavy metals (As, Cu and Pb) and total phosphorus (TP), but also inactivate bacteria and reduce wastewater toxicity. This work demonstrates that the integrated process combining SBR with Fenton's reagent could provide comprehensive treatment to swine wastewater.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Hai-dian District, Beijing 100085, China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Ben
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Qiang
authors.forename: Xun
authors.initials: X
authors.lastname: Pan
authors.forename: Meixue
authors.initials: M
authors.lastname: Chen
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000302:isolation & purification*; D019149:Bioreactors; D020100:Hydrogels; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008670:Metals / Q000302:isolation & purification*; D013552:Swine; D014730:Veterinary Medicine
chemical_list: D000900:Anti-Bacterial Agents; C045076:Fenton's reagent; D020100:Hydrogels; D008670:Metals; D006861:Hydrogen Peroxide; D007501:Iron