Full Description

A submerged ultrafiltration membrane operated with chemical coagulationwas pilot tested on a continuous basis for three and a half months in Conway,Arkansas. Pilot testing was divided into two-week phases that alternated betweenthe two raw water sources for Conway, Lake Brewer and Cadron Creek. Four primaryoperating conditions were tested: no chemical addition; alum addition; alum andpowdered activated carbon (PAC) addition; and, alum and potassium permanganate(KMnO4) addition. Each operating condition was tested for two weeks on the lakeand then followed by two weeks of testing on the creek. Total organic carbon(TOC) was measured for both supplies throughout the testing to determine the needfor enhanced coagulation and the performance of the membranes for each supply.Disinfection byproduct (DBP) formation testing included sampling forTrihalomethanes (THM) and Haloacetic Acids (HAA). Powdered activated carbon wasincorporated into the testing program as a potential means of total organiccarbon removal and/or taste and odor control. The effects of KMnO4 addition onmanganese removal and membrane performance were also evaluated. Other analysis ofthe raw water and permeate during the testing included: UV254; iron; manganese;specific conductance; E. coli.; total coliforms; and, algae. The results from thepilot testing were compared to sampling from the full-scale plant, which is aconventional treatment plant that uses Lake Brewer as the primary water source. Includes 4 references, tables, figures.

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Edition: Vol. - No. Published: 05/01/2001 Number of Pages: 13File Size: 1 file , 310 KB