Department of Civil and Environmental Engineering, University of Cyprus, 75 Kallipoleos St., 1678 Nicosia, Cyprus; Nireas, International Water Research Centre, University of Cyprus, Cyprus.
CBQF/Escola Superior de Biotecnologia, Universidade Católica Portuguesa, R. Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal.
Water Res. 2012 Nov 1;46(17):5621-5634. doi: 10.1016/j.watres.2012.07.049. Epub 2012 Aug 7.
This work investigated the application of a solar driven advanced oxidation process (solar photo-Fenton), for the degradation of antibiotics at low concentration level (μg L(-1)) in secondary treated domestic effluents at a pilot-scale. The examined antibiotics were ofloxacin (OFX) and trimethoprim (TMP). A compound parabolic collector (CPC) pilot plant was used for the photocatalytic experiments. The process was mainly evaluated by a fast and reliable analytical method based on a UPLC-MS/MS system. Solar photo-Fenton process using low iron and hydrogen peroxide doses (Fe(2+) = 5 mg L(-1); H(2)O(2) = 75 mg L(-1)) was proved to be an efficient method for the elimination of these compounds with relatively high degradation rates. The photocatalytic degradation of OFX and TMP with the solar photo-Fenton process followed apparent first-order kinetics. A modification of the first-order kinetic expression was proposed and has been successfully used to explain the degradation kinetics of the compounds during the solar photo-Fenton treatment. The results demonstrated the capacity of the applied advanced process to reduce the initial wastewater toxicity against the examined plant species (Sorghum saccharatum, Lepidium sativum, Sinapis alba) and the water flea Daphnia magna. The phytotoxicity of the treated samples, expressed as root growth inhibition, was higher compared to that observed on the inhibition of seed germination. Enterococci, including those resistant to OFX and TMP, were completely eliminated at the end of the treatment. The total cost of the full scale unit for the treatment of 150 m(3) day(-1) of secondary wastewater effluent was found to be 0.85 € m(-3).
本工作研究了太阳能驱动的高级氧化工艺（太阳能光芬顿）在中试规模下对二级处理生活废水中低浓度（μg/L）抗生素的降解应用。所研究的抗生素为氧氟沙星（OFX）和甲氧苄啶（TMP）。采用复合抛物面集热器（CPC）中试装置进行光催化实验。该工艺主要通过基于 UPLC-MS/MS 系统的快速可靠的分析方法进行评估。使用低铁和过氧化氢剂量（[Fe(2+)]（0）= 5 mg/L；[H(2)O(2)]（0）= 75 mg/L）的太阳能光芬顿工艺被证明是一种有效方法，可相对高的降解速率去除这些化合物。OFX 和 TMP 的光催化降解采用太阳能光芬顿工艺遵循表观一级动力学。提出了对一级动力学表达式的修正，并成功地用于解释在太阳能光芬顿处理过程中化合物的降解动力学。结果表明，所应用的高级工艺能够降低初始废水对所研究植物物种（高粱、生菜、白菜）和水蚤 Daphnia magna 的毒性。与观察到的种子发芽抑制相比，处理样品的植物毒性（以根生长抑制表示）更高。处理结束时，包括对 OFX 和 TMP 有抗性的肠球菌在内的所有肠球菌均被完全消除。处理 150 m³/d 二级废水的全规模单元的总成本被发现为 0.85 欧元/m³。
