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Figure 1 shows the first section of the setup. It contains the raw water, alum, and clay stock buckets, as well as the pumps and influent turbidimeter. The raw water turbidity is controlled using a feedback loop on Process Controller ProCoDA Software. The influent turbidimeter is constantly monitoring the raw water stock turbidity since raw water is pumped to the influent turbidimeter by the turbidimeter pump in a loop which returns it to the stock bucket. If the turbidity drops below the desired value, the clay stock valve opens for one second every ten seconds until the desired turbidity is reached. The raw water turbidity will dilute as the plant runs.
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As shown in Figure 2, raw water and alum stock are pumped into the plant using peristaltic pumps. The flow rates for these pumps are set in Process Controller ProCoDA Software to provide the desired plant flow rate and alum dose. The coiled, narrow diameter tubing to the left of the turbidimeter in Figure 2 serves as a rapid mix for the alum and raw water.
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