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TESTING SOLIDS SETTING APPARATUSES FOR DESIGN AND OPERATION OF WET-WEATHER FLOW SOLIDS-LIQUID SEPARATION PROCESSES
Citation:
O'Connor*, T P., J. Cigana, B. Gagne, M. Couture, AND Meunier. TESTING SOLIDS SETTING APPARATUSES FOR DESIGN AND OPERATION OF WET-WEATHER FLOW SOLIDS-LIQUID SEPARATION PROCESSES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-02/090, 2002.
Impact/Purpose:
information.
Description:
This study was a side-by-side comparison of two settling evaluation methods: one traditional and one new. The project investigated whether these column tests were capable of capturing or representing the rapidly settling particles present in wet-weather flows (WWF). The report reviews the sampling procedures and analytical methods used and presents data and results. The study was conducted in three phases: fabrication and preliminary testing, laboratory testing, and field testing. Equipment for the two testing methods was fabricated and laboratory tested and preliminary evaluations were made. Laboratory tests were conducted with well characterized settling media, microsand, and clay soil in order to measure suspended solid (SS) concentrations and develop settling distributions on known substances in the columns prior to testing actual 'WWF which exhibits variable SS concentrations and settling distributions. Field tests were conducted at a combined sewer control structure. A summary of the performance as measured by predicted percent removal of both columns for 15 laboratory tests and 3 field tests is presented, as well as a comparison of the advantages and disadvantages of the two methods. The newer testing method did not perform up to the theoretical expectations of the method. The report ends with conclusions and recommendations regarding the two specific methods and the settleability test in general.