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AWWA WQTC58822
- The Use of Diagnostic Tools to Determine the Operational Properties of Organic Flocs
- Conference Proceeding by American Water Works Association, 11/02/2003
- Publisher: AWWA
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Floc structural characteristics are fundamental to the efficient removal of organic material at watertreatment works. Assessment of floc structure can therefore be an important tool in determiningoperational performance at the waterworks. Floc size, strength and settlement characteristics wereassessed for three coagulant doses using an iron based coagulant. Size and strength was determinedusing conventional light microscopy and an on-line laser diffraction technique. Settlementcharacteristics were measured using a settling column with a CCD video camera and image analysissoftware. Significant differences in floc size, strength and settlement were observed using the abovetechniques. The coagulant dose as used by the waterworks at the time of abstraction gave the bestfloc structure. Complex interactions occur between organic material and coagulant during thecoagulation process and floc structure is likely to be determined by the ratio of organic matter andcoagulant within the floc structural mass. Includes 17 references, tables, figures.
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