Ben Weiwei, Qiang Zhimin, Pan Xun, Chen Meixue
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Hai-dian District, Beijing 100085, China.
Water Res. 2009 Sep;43(17):4392-402. doi: 10.1016/j.watres.2009.06.057. Epub 2009 Jul 4.
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.
兽用抗生素在畜牧业中的大规模应用使得猪场废水成为抗生素污染的一个重要来源。本研究考察了在序批式反应器（SBR）预处理的猪场废水中，芬顿试剂对六种选定抗生素（包括五种磺胺类药物和一种大环内酯类药物）的降解情况。对芬顿试剂的投加方式和实际投加量进行了优化，以在节约处理成本的同时有效去除抗生素。考察了SBR出水的初始pH值、化学需氧量（COD）和悬浮固体（SS）对抗生素降解的影响。结果表明，芬顿试剂实际应用的最佳条件如下：分批投加方式，[H₂O₂]/[Fe²⁺]摩尔比为1.5:1，初始pH值为5.0。在最佳条件下，芬顿试剂能有效降解所有选定的抗生素，并且对SBR出水的背景COD（0 - 419 mg/L）和SS（0 - 250 mg/L）的变化具有抗性。此外，芬顿试剂不仅有助于去除总有机碳（TOC）、重金属（As、Cu和Pb）和总磷（TP），还能使细菌失活并降低废水毒性。本研究表明，SBR与芬顿试剂相结合的集成工艺可为猪场废水提供综合处理。
