González Oscar, Sans Carme, Esplugas Santiago
Facultat de Química, Departament d'Enginyeria Química, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
J Hazard Mater. 2007 Jul 31;146(3):459-64. doi: 10.1016/j.jhazmat.2007.04.055. Epub 2007 Apr 20.
The objective of this work was to study the abatement of 200mgL(-1) sulfamethoxazole (SMX) solution by means of photo-Fenton process. Biodegradability of the treated solutions was followed by the ratio biochemical oxygen demand at five days/chemical oxygen demand (BOD(5)/COD) and toxicity by Microtox and inhibition tests. Experiments with different initial concentration of H(2)O(2) were carried out. The initial amount of Fe(2+) and pH of the solution were set at 10mgL(-1) and 2.8 respectively. The temperature of the reactor was kept constant in all the experiments (25+/-0.8 degrees C). Photo-Fenton process is thought to be a successful treatment step to improve the biodegradability of wastewater containing SMX. The complete antibiotic removal was achieved for a H(2)O(2) dose over 300mgL(-1). Biodegradability (BOD(5)/COD) rose from zero (SMX solution) to values higher than 0.3 (treated solutions). Toxicity and inhibition tests pointed out in the same direction: oxidized intermediates for initial H(2)O(2) dose over 300mgL(-1) showed no toxicity effects on pure bacteria and no inhibition on activated sludge activity.
本研究旨在通过光芬顿法研究200mgL(-1)磺胺甲恶唑（SMX）溶液的降解情况。通过五日生化需氧量与化学需氧量的比值（BOD(5)/COD）跟踪处理后溶液的生物降解性，并通过微毒性和抑制试验检测毒性。进行了不同初始浓度H(2)O(2)的实验。溶液中Fe(2+)的初始量和pH值分别设定为10mgL(-1)和2.8。在所有实验中，反应器温度保持恒定（25±0.8℃）。光芬顿法被认为是提高含SMX废水生物降解性的成功处理步骤。当H(2)O(2)剂量超过300mgL(-1)时，抗生素被完全去除。生物降解性（BOD(5)/COD）从零（SMX溶液）提高到高于0.3的值（处理后溶液）。毒性和抑制试验也表明了相同的趋势：初始H(2)O(2)剂量超过300mgL(-1)时产生的氧化中间体对纯细菌无毒性影响，对活性污泥活性无抑制作用。
