River bank filtration (RBF) is one among the managed aquifer recharge methods which is inexpensive and sustainable means to improve the quality of surface waters undergoes natural treatment by subsurface flow through the aquifer medium. This study was carried out to investigate the feasibility of a RBF to improve water quality of Gorganroud River, Iran. For this purpose, 48 water samples were simultaneously collected from three water sources (river, production well, and groundwater) to analyze twenty-six water quality parameters. Hydrogeochemical results revealed that the production well together with river water had a similar origin whereas the groundwater was different. Furthermore, the water quality of production well is mainly controlled by the chemical quality of the Gorganroud River water together with microbial, chemical, and physical processes that occur during the RBF. Results showed that 12 out of 26 the water quality parameters (e.g., total coliforms, turbidity, color, salinity, ammonia, nitrite, nitrate, BOD, COD, iron, manganese, and pH) decreased in the production well. The average removal efficiency of total coliforms bacteria, turbidity, and color parameters was found to be about 98, 97.7, and 72%, respectively. Results of Tukey and Games-Howell tests indicated that there was no statistical difference between chemical composition of river water and the production well water (except ammonia, calcium, and magnesium). Results revealed that the natural attenuation of surface water using the RBF can effectively enhance the water quality index values of the extraction well. Therefore, the RBF system is an effective approach to treat Gorganroud River water that will expand the natural treatment options available to Iranian water utilities in Golestan Province.

河岸过滤（RBF）是一种有管理的含水层补给方法，它是一种廉价而可持续的手段，可以通过流经含水层介质的地下流来对地表水的质量进行自然处理。这项研究是为了研究RBF改善伊朗Gorganroud河水质的可行性。为此，从三个水源（河流，生产井和地下水）同时收集了48个水样本，以分析26个水质参数。水文地球化学结果表明，生产井与河水的来源相似，而地下水却不同。此外，生产井的水质主要受Gorganroud河水的化学质量以及微生物，化学物质，和在RBF期间发生的物理过程。结果表明，在生产井中，有26个水质参数中的12个（例如大肠菌群，浑浊度，颜色，盐度，氨，亚硝酸盐，硝酸盐，BOD，COD，铁，锰和pH）降低了。发现总大肠菌群细菌的平均去除效率，浊度和颜色参数分别约为98％，97.7和72％。Tukey和Games-Howell测试的结果表明，河水和生产井水（氨，钙和镁除外）的化学成分之间没有统计学差异。结果表明，利用RBF对地表水进行自然衰减可以有效提高提取井的水质指标值。因此，