Regnery Julia, Barringer Jessica, Wing Alexandre D, Hoppe-Jones Christiane, Teerlink Jennifer, Drewes Jörg E
NSF Engineering Research Center ReNUWIt, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, USA.
NSF Engineering Research Center ReNUWIt, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, USA; Chair of Urban Water Systems Engineering, Technische Universität München, Garching, Germany.
Chemosphere. 2015 May;127:136-42. doi: 10.1016/j.chemosphere.2014.12.076. Epub 2015 Feb 10.
The performance of a full-scale riverbank filtration facility in Colorado was evaluated from initial start-up over a period of seven years including the impact of seasonal variations to determine whether sustainable attenuation of various chemical constituents could be achieved. Both, annual and seasonal average concentrations were determined for several wastewater-derived constituents including dissolved organic carbon (DOC), ultraviolet absorbance at 254 nm, nitrate, phosphate for the years 2006, 2009, 2010, 2012, and trace organic chemicals (TOrC) for years 2009, 2010, and 2012. ANOVA analyses and Student's t-tests were performed to evaluate the consistency of contaminant attenuation at the site. Findings revealed no significant statistical differences for any of the bulk parameters with the exception of phosphate suggesting a highly reliable attenuation of DOC and nitrate from start-up to full-scale performance. Phosphate attenuation, however, exhibited a steady decline, which was likely attributed to exhaustion of sorption sites in the subsurface porous media. The river's flow regime influenced both occurrence levels and attenuation of TOrC during riverbank filtration, i.e. less river discharge resulted in higher TOrC concentrations and lower proportion of river water in the recovered groundwater. Differences in removal performance between annual data sets for caffeine, trimethoprim, sulfamethoxazole, and carbamazepine were caused by variations in the source; concentrations in riverbank filtrate remained similar over several years. The seasonal assessment for TOrC revealed steady or improving removal between winter and summer seasons based on the statistical analysis with atenolol being the only exception likely due to an increased microbial activity at elevated temperatures.
对科罗拉多州一个全尺寸河岸过滤设施从初始启动起七年期间的运行情况进行了评估，包括季节变化的影响，以确定是否能够实现各种化学成分的可持续衰减。测定了2006年、2009年、2010年、2012年几种源自废水的成分（包括溶解有机碳（DOC）、254nm处的紫外线吸光度、硝酸盐、磷酸盐）以及2009年、2010年和2012年痕量有机化学品（TOrC）的年度和季节平均浓度。进行了方差分析和学生t检验，以评估该场地污染物衰减的一致性。研究结果表明，除磷酸盐外，任何总体参数均无显著统计差异，这表明从启动到全尺寸运行期间，DOC和硝酸盐的衰减高度可靠。然而，磷酸盐的衰减呈稳步下降趋势，这可能归因于地下多孔介质中吸附位点的耗尽。河流的水流状态影响了河岸过滤过程中TOrC的出现水平和衰减，即河流流量减少导致TOrC浓度升高，而回采地下水中河水的比例降低。咖啡因、甲氧苄啶、磺胺甲恶唑和卡马西平年度数据集之间去除性能的差异是由来源变化引起的；河岸滤液中的浓度在几年内保持相似。基于统计分析，TOrC的季节评估显示冬季和夏季之间的去除率稳定或提高，阿替洛尔是唯一的例外，这可能是由于温度升高导致微生物活性增加。
