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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Simultaneous degradation of ciprofloxacin, amoxicillin, sulfathiazole and sulfamethazine, and disinfection of hospital effluent after biological treatment via photo-Fenton process under ultraviolet germicidal irradiation
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Simultaneous degradation of ciprofloxacin, amoxicillin, sulfathiazole and sulfamethazine, and disinfection of hospital effluent after biological treatment via photo-Fenton process under ultraviolet germicidal irradiation

机译：同时降解环丙沙星，阿莫西林，磺胺嘧啶和磺胺甲嘧啶，通过紫外线杀菌辐照下的生物处理后生物处理后医院流出物的消毒

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A UVC-assisted photo-Fenton process was applied to hospital wastewater that had been submitted to anaerobic treatment. Low iron (10 mu M; 0.56 mg L-1) and H2O2 (500 mu M; 17 mg L-1) concentrations were used at the natural pH of the effluent (pH approximate to 7.4). Citric acid was employed as a complexation agent, at a 1:1 ratio, in order to maintain Fe3+ soluble at this pH, avoiding extra procedures and costs associated with acidification/basification of the final effluent. The anaerobic process quantitatively reduced the biochemical oxygen demand (BOD5), chemical oxygen demand (COD) and total organic carbon (TOC), with low removal of antibiotics present in the wastewater. Degradation of the antibiotics ciprofloxacin, amoxicillin, sulfathiazole, and sulfamethazine was studied by spiking the anaerobic effluent at initial concentrations of 200 mu g L-1. The antibiotics were efficiently degraded (80-95%) using UVC radiation alone, although under this condition, no DOC removal was observed after 90 min. Further additions of H2O2 and iron citrate increased the degradation rate constant (k(obs)), and 8% of DOC was removed. A lower pH resulted in higher k(obs), although this was not essential for application of the photo-Fenton process. Irradiation with a germicidal lamp resulted in greater degradation of the antibiotics, compared to use of a black light lamp or sunlight, since the overall degradation was influenced by photolysis of the antibiotics, photolysis of H2O2, and the Fenton reaction. The photo-Fenton treatment could also be applied directly to the raw hospital wastewater, since no significant difference in degradation of the antibiotics was observed, compared to the anaerobic effluent. The photo-Fenton process under UVA and solar radiation reduced total coliforms and E. coli after 90 min. However, quantitative disinfection of these bacteria present in the Hospital effluent was only accomplished under UVC radiation.
机译：将UVC辅助的光芬顿工艺应用于已提交给厌氧治疗的医院废水。在流出物的天然pH（pH近似为7.4），使用低铁（10μm; 0.56mg L-1）和H 2 O 2（500μm; 17mg L-1）浓度。柠檬酸用作络合剂，在1：1的比例下，为了保持Fe3 +可溶于该pH值，避免与最终流出物的酸化/碱化相关的额外程序和成本。厌氧过程定量降低了生物化学需氧量（BOD5），化学需氧量（COD）和总有机碳（TOC），低除去废水中存在的抗生素。通过在初始浓度为200μgL-1的初始浓度下掺入厌氧流出物来研究抗生素环丙沙星的降解。单独使用UVC辐射有效降解（80-95％），尽管在这种情况下，但在90分钟后没有观察到DOC去除。进一步添加H 2 O 2和铁柠檬酸盐的降解率常数（K（OB）），除去8％的DOC。较低的pH导致较高的K（OBS），虽然这对于应用光芬工艺并不重要。与使用黑光灯或阳光的使用相比，杀菌灯的辐照导致抗生素的降解导致抗生素更大，因为通过对抗生素的光解，H2O2的光解和芬顿反应影响了整体降解。光芬顿治疗也可以直接应用于原始医院废水，因为与厌氧流出物相比，观察到抗生素的降解没有显着差异。 UVA和太阳辐射下的光芬顿工艺在90分钟后减少了总大肠杆菌和大肠杆菌。然而，仅在UVC辐射下完成了本医院流出物中这些细菌的定量消毒。

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