Abstract
A streaming current detector (SCD) was used in continuous flow experiments to characterize its response to various conditions. Buffered water and kaolinite systems were coagulated with alum at various doses. The dose was incremented in a stepwise manner while monitoring SCD output, or alternated between samples with and without alum added. It was found that the SCD responded rapidly and reversibly to changes in sample characteristics over a wide range of coagulant concentrations. Readings were similar to those obtained from batch SCD measurements. However, when extremely high doses of alum or ferric chloride (2 × 10 −1 M as Al or Fc) were applied, the SCD signal became erratic. Extent and characteristics of this effect differed according to the coagulant used, delay time between the coagulant addition and SCD sampling, coagulant dose and whether or not an ultrasonic cleaning accessory was employed. Several different cleaning methods were found to alleviate the difficulties, but some cleaning agents themselves interfered with SCD output.
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