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The complete experimental assembly consists of synthetic raw water (SRW) and coagulant metering system, rapid mix and tube flocculator, and flocculation residual turbidity analyzer (FReTA). (Figure 1) The turbidimeter with a feedback loop is used to measure the influent turbidity and the turbidimeter of FReTA measures the effluent turbidity.
Figure 1 Schematic of the complete experimental assembly. (Updated from Ian Tse's MS thesis, Aug. 2009)3.1 SRW and coagulant metering system
The SRW and coagulant metering system includes a reservoir of clay suspension (10g/L), a reservoir of tap water and three pumps (Figure 3). The clay suspension is added to the tap water periodically by the regulation of a solenoid pinch valve. Both alum stock and raw water (with added clay suspension) are drawn by the pumps to mix together. A portion of raw water is pumped into a turbidimeter for the measurement of influent turbidity and then flows back into the raw water feedstock to maintain a constant volume. A flow accumulator connected to the pump dampens the periodic pulses caused by the pump rollers.
SRW and coagulant metering system
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