Arsenic Removal from Drinking Water by Adsorptive Media: U.S. EPA Demonstration Project at Webb Consolidated Independent School District in Bruni, TX. Final Performance Evaluation Report.

摘要

This report documents the activities performed and the results obtained from the arsenic removal treatment technology demonstration project at the Webb Consolidated Independent School District (Webb CISD) in Bruni, TX. The main objective of the project was to evaluate the effectiveness of AdEdge Technologies' AD-33 media in removing arsenic to meet the new arsenic maximum contaminant level (MCL) of 10 microg/L. Additionally, this project evaluated (1) the reliability of the treatment system (Arsenic Package Unit), (2) the required system operation and maintenance (O&M) and operator skills, and (3) the capital and O&M cost of the technology. The project also characterized the water in the distribution system and residuals produced by the treatment process. The types of data collected include system operation, water quality (both across the treatment train and in the distribution system), process residuals, and capital and O&M cost. The treatment system consisted of two 42-in OE 72-in carbon steel vessels in series configuration, each containing approximately 22 ft3 of AD-33 pelletized media, which is an iron-based adsorptive media developed by Bayer AG and marketed under the name of AD-33 by AdEdge Technologies. The treatment system was designed for a peak flowrate of 40 gal/min (gpm) and an empty bed contact time (EBCT) of approximately 4.1 min per vessel. Over the performance evaluation period, the actual average flowrate was estimated at 40 gpm (although with quite a bit of fluctuation), based on readings of an hour meter interlocked to the well pump and the electromagnetic flow meter/totalizer installed on each adsorption vessel.