RBC Operation

During normal operation, operator vigilance is required to observe the RBC movement, slime color, and appearance; however, if the unit is covered, observations may be limited to that portion of the media that can be viewed through the access door. Slime color and appearance can indicate process condition; for example:

• Gray, shaggy slime growth indicates normal operation.

• Reddish-brown or golden shaggy growth indicates nitrification.

• A white, chalky appearance indicates high sulfur concentrations.

• No slime indicates severe temperature or pH changes.

Sampling and testing should be conducted daily for dissolved oxygen content and pH. BOD5 and suspended solids testing should also be accomplished to aid in assessing performance.

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