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Using Coagulation to Enhance the Performance of Filtration at the South Truckee Meadows Water Reclamation Facility
AdvisorDennett, Keith E
Civil and Environmental Engineering
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During this research, enhanced coagulation was evaluated as part of the proposed treatment to improve the overall quality of the reuse water at the South Truckee Meadows Water Reclamation Facility (STMWRF) in Reno, Nevada. Extensive jar testing was conducted on the water returning from Huffaker Reservoir and the effluent from the secondary clarifiers to determine the coagulant dosages and the pH conditions for optimum coagulation to enhance the performance of the existing Parkson DynaSand® upflow filters. Five different coagulants were tested including aluminum sulfate, ferric chloride, polyaluminum chloride, and two aluminum-based coagulants (CC2110 and CC2220). Results were compared with the U.S. EPA Guidelines for Water Reuse, the Nevada Administrative Code (NAC), and the California Department of Public Health Recycled Water Regulations. The optimum dosages of the coagulants used in jar testing effectively reduced the turbidity of filtered water below 2 NTU. Water quality testing at STMWRF was also performed during multiple 12-hour and 24-hour periods by monitoring pH, temperature, turbidity, total suspended solids, electrical conductivity, UV absorbance at 254 nm, and total organic carbon. Seasonal variations of pH, temperature, and turbidity of the water withdrawn from the reservoir were also assessed. From July through September 2016, in-situ water quality monitoring at different water depths at two locations within the reservoir was performed for pH, turbidity, temperature, and dissolved oxygen (DO). In general, the quality of the water within the reservoir deteriorated as the irrigation season progresses.