Process Control Calculations

As with many other wastewater treatment plant unit processes, process control calculations aid in determining the performance of the sedimentation process. Process control calculations are used in the sedimentation process to determine:

• Percent removal

• Hydraulic detention time

• Surface loading rate (surface settling rate)

• Weir overflow rate (weir loading rate)

• Sludge pumping

In the following sections we take a closer look at a few of these process control calculations and example problems.

Note: The calculations presented in the following sections allow you to determine values for each function performed. Keep in mind that an optimally operated primary clarifier should have values in an expected range.

13.1.4.1 Percent Removal

The expected ranges of percent removal for a primary clarifier are:

Settleable solids 90-95% Suspended solids 40-60% BOD5 25-35%

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