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As with most modern water treatment processes, the Rawdon DAF system utilizes a high degree of computer automation and control. The chemical dosages are automatically adjusted based on information from the plant instrumentation. The automated dosage control system can make minor feed rate adjustments in response to changes in raw water quality, reducing the operator demand. These automatic adjustments are based on measurements of pH, and turbidity in the raw and DAF effluent streams.
By using parameters used routinely by the operator for process control, it is easier to combine manual and automated process control. In this system, the operator retains control of the process, but the automated system makes minor adjustments to maintain optimum performance. The operator interacts with the process through an advanced computer interface. The VTS interface software gives the operator access to all control parameters and records process data for analysis and reporting. |
