Grünheid Steffen, Amy Gary, Jekel Martin
Department of Water Quality Control, Institute for Environmental Engineering, Technical University Berlin, Sekr. KF 4, Strasse des 17. Juni 135, 10623 Berlin, Germany.
Water Res. 2005 Sep;39(14):3219-28. doi: 10.1016/j.watres.2005.05.030.
Bank filtration and artificial recharge provide an important drinking water source to the city of Berlin. Due to the practice of water recycling through a semi-closed urban water cycle, the introduction of effluent organic matter (EfOM) and persistent trace organic pollutants in the drinking water is of potential concern. In the work reported herein, the research objectives are to study the removal of bulk and trace organics at bank filtration and artificial recharge sites and to assess important factors of influence for the Berlin area. The monthly analytical program is comprised of dissolved organic carbon (DOC), UV absorbance (UVA254), liquid chromatography with organic carbon detection (LC-OCD), differentiated adsorbable organic halogens (AOX) and single organic compound analysis of a few model compounds. More than 1 year of monitoring was conducted on observation wells located along the flowpaths of the infiltrating water at two field sites that have different characteristics regarding redox conditions, travel time, and travel distance. Two transects are highlighted: one associated with a bank filtration site dominated by anoxic/anaerobic conditions with a travel time of up to 4-5 months, and another with an artificial recharge site dominated by aerobic conditions with a travel time of up to 50 days. It was found that redox conditions and travel time significantly influence the DOC degradation kinetics and the efficiency of AOX and trace compound removal.
岸边过滤和人工回灌为柏林市提供了重要的饮用水源。由于通过半封闭城市水循环进行水的循环利用，饮用水中引入的污水有机物（EfOM）和持久性微量有机污染物备受关注。在本文报道的工作中，研究目标是研究岸边过滤和人工回灌场地中大量和微量有机物的去除情况，并评估柏林地区的重要影响因素。月度分析项目包括溶解有机碳（DOC）、紫外线吸光度（UVA254）、带有机碳检测的液相色谱法（LC-OCD）、区分可吸附有机卤素（AOX）以及几种模型化合物的单一有机化合物分析。对位于两个现场场地渗透水流路径沿线的观测井进行了为期一年多的监测，这两个场地在氧化还原条件、停留时间和流动距离方面具有不同特征。突出了两个断面：一个与以缺氧/厌氧条件为主的岸边过滤场地相关，停留时间长达4 - 5个月；另一个与以好氧条件为主的人工回灌场地相关，停留时间长达50天。研究发现，氧化还原条件和停留时间显著影响DOC降解动力学以及AOX和微量化合物的去除效率。
