Pesticides widely used for intensive agriculture may leach to groundwater and pose problems to drinking water and irrigation. UV-C disinfection systems (UV-DS) for water disinfection can be used also for the abatement of organic micropollutants. A pilot-scale continuous flow-through UV-DS system was evaluated for its degradation efficiency of atrazine (ATR), malathion (MAL) and glyphosate (GLY) from 40 L water. Groundwater used to irrigate potato fields and recycled wastewater used to wash potatoes were treated without catalysts to avoid any toxicity effect on potatoes. Chromatographic methods were used to quantify very low pesticide levels before and after UV-C treatments (<10 µg L^-1), while a specific method was adapted to analyse traces of GLY (0.0008-10 µg L^-1) in recycled wastewater containing suspended particulate matter (SPM). ATR was completely eliminated from groundwater after 15 min photodegradation while 80% was removed from the turbid wastewater after 25 min. For MAL, 70-80% was removed in 25 minutes from the groundwater. For wastewater, the initial concentration was important for the performance of the photolytic process. An amount of 75% of GLY was eliminated after 10 minutes irradiation at concentrations higher than those found in natural groundwater. In wastewater, the UV-C treatment was less efficient because GLY was mainly adsorbed to SPM which obstruct the photodegradation process. Therefore, the pilot-scale UV-DS using a turbulent flow and a multiple-lamp system was performant to remove quantitatively traces of pesticides from large volumes of water, by direct photolytic oxidation, when the turbidity of the treated water was limited.

广泛用于集约化农业的杀虫剂可能会渗入地下水并对饮用水和灌溉造成问题。用于水消毒的 UV-C 消毒系统 (UV-DS) 也可用于减少有机微污染物。评估了中试规模连续流通式 UV-DS 系统对莠去津 (ATR)、马拉硫磷 (MAL) 和草甘膦 (GLY) 从 40  L 水中的降解效率。用于灌溉马铃薯田的地下水和用于清洗马铃薯的回收废水均未经催化剂处理，以避免对马铃薯产生任何毒性影响。色谱方法用于量化 UV-C 处理前后非常低的农药水平 (<10  µg  L ^-1 )，同时采用特定方法分析痕量 GLY (0.0008-10  µg L ^-1 ) 在含有悬浮颗粒物 (SPM) 的回收废水中。ATR 在 15 分钟光降解后从地下水中完全消除，而在 25 分钟后从浑浊废水中去除 80% 。对于 MAL，在 25 分钟内从地下水中去除了 70-80% 。对于废水，初始浓度对光解过程的性能很重要。10 次后消除了 75% 的 GLY 分钟辐照浓度高于天然地下水中的浓度。在废水中，UV-C 处理效率较低，因为 GLY 主要吸附在 SPM 上，阻碍了光降解过程。因此，当处理水的浊度有限时，使用湍流和多灯系统的中试规模 UV-DS 可以通过直接光解氧化从大量水中定量去除痕量农药。