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A pilot study was conducted to evaluate the treatment processes for a proposed 40.5 milliongallons per day water treatment plant for the Turlock Irrigation District in Turlock, Californiafrom August 2006 to April 2007. The pilot plant consisted of two process trains. The firstconsisted of a static mixer, flocculator, and plate settler, followed by three microfiltration/ultrafiltration (MF/UF) systems; the second was reserved for independent high-rateclarification (HRC) suppliers to pilot their proprietary systems. Two dissolved air flotationmanufacturers and one ballasted flocculation manufacturer were piloted and evaluated on theirperformance.The HRC systems were evaluated based on an assessment of their ability to treat the surfacewater to meet clarified water quality objectives. HRC clarified water was also qualitativelyassessed to evaluate its fouling potential of membrane systems, a proposed downstream processfor the full scale facility. The comparison was made based on conventional water quality parameters,such as turbidity, total organic carbon (TOC), UVA 254 absorbance, color, andpotential reduction of fouling potential to downstream microfiltration membranes.The fouling potential of the clarified effluent was quantified based on several factors includingthe residual aluminum and iron concentrations, TOC concentrations, UV-254 absorbance, andthe TSS concentrations. In addition to these water quality parameters, modified silt densityindex (SDI) tests were run on the clarified effluents and the raw water in an attempt to comparethe fouling rates. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 10File Size: 1 file , 180 KB