Naddafi Kazem, Martinez Susana Silva, Nabizadeh Ramin, Yaghmaeian Kamyar, Shahtaheri Seyed Jamaleddin, Amiri Hoda
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran.
Centro de Investigación en Ingeniería y Ciencias Aplicadas, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Mor., Mexico.
Water Sci Technol. 2021 Jan;83(1):212-222. doi: 10.2166/wst.2020.556.
This study represents the first application of Fe-citrate-based photo-Fenton chemistry for the degradation of chlorpyrifos (CPF) spiked into agricultural runoff, and its phytotoxicity assessment. The effects of the initial CPF concentration, time and ratio of Fe-citrate/HO on CPF removal during the photo-Fenton reaction were investigated and modeled with analysis of variance using R software by the response-surface methodology package. According to the stationary point in original units, the optimal condition for 70.00% CPF removal was as follows: CPF = 2.5 mg L (0.0), time = 48.0 min (0.585) and Fe-citrate/HO = 0.075 (0.539). Beside running the system at near-neutral pH, another strength of this study is related to the treatment of agricultural runoff contaminated with CPF with a raceway pond reactor, which has the advantages of simplicity of the facilities and procedures, as well as the possibility of using sunlight more efficiently in the field of applications. Finally, untreated and treated agriculture runoffs were used as irrigation to determine their phytotoxic effects on seed germination of cress (Lepidium sativum). Solar photo-Fenton treatment greatly reduced phytotoxicity of agriculture runoff and showed the highest germination percentage (70%) compared to both raw agricultural runoff (60%) and untreated CPF-spiked runoff (35%).
本研究首次应用基于柠檬酸铁的光芬顿化学法降解农业径流中添加的毒死蜱（CPF）及其植物毒性评估。研究了光芬顿反应过程中初始CPF浓度、时间以及柠檬酸铁/过氧化氢比例对CPF去除效果的影响，并使用R软件通过响应面法包中的方差分析进行建模。根据原始单位的驻点，去除70.00%CPF的最佳条件如下：CPF = 2.5 mg/L（0.0），时间 = 48.0分钟（0.585），柠檬酸铁/过氧化氢 = 0.075（0.539）。除了在近中性pH下运行系统外，本研究的另一个优点是使用跑道池塘反应器处理受CPF污染的农业径流，该反应器具有设施和程序简单的优点，并且在应用领域更有效地利用阳光成为可能。最后，将未经处理和经过处理的农业径流用作灌溉水，以确定它们对水芹（独行菜）种子萌发的植物毒性影响。与原始农业径流（60%）和未经处理的添加CPF的径流（35%）相比，太阳能光芬顿处理大大降低了农业径流的植物毒性，并显示出最高的发芽率（70%）。
