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For a functional description of FReTA components and how to troubleshoot them, Information and Details.
The experimental setup we use to analyze flocculator performance is known as the Flocculator Residual Turbidity Analyzer (FReTA). 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. 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 turbidity will dilute down as the plant runs.
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