Environmental Engineering Reference
In-Depth Information
Corrective actions
Identify and correct grit removal problem.
•
•
Identify and correct primary settling problem.
7.4.6.5 Shaft Bearings
Symptom
•
Shaft bearings running hot or failing
Causal factor
Inadequate maintenance
•
Corrective action
Follow manufacturer's recommendations.
•
7.4.6.6 Drive Motor
Symptom
Drive motor
•
running hot
Causal factors
Inadequate maintenance
•
•
Improper chain drive alignment
Corrective actions
Follow manufacturer's recommendations.
•
•
Adjust alignment.
7.4.7 rbC Process Control Calculations
Several process control calculations may be useful in the operation
of a RBC. These include soluble BOD, total media area, organic loading
rate, and hydraulic loading rate. Settling tank calculations and sludge
pumping calculations may be helpful for evaluation and control of the
settling tank following the RBC.
7.4.7.1 RBC Soluble BOD
The soluble BOD
5
concentration of the RBC influent can be deter-
mined experimentally in the laboratory, or it can be estimated using the
suspended solids concentration and the
k
factor. The
k
factor is used to
approximate the BOD
5
(particulate BOD) contributed by the suspended
matter. The
k
factor must be provided or determined in a laboratory. The
k
factor for domestic wastes is normally in the range of 0.5 to 0.7.
Soluble BOD
5
= Total BOD
5
- (
k
factor × Total Suspended Solids)
(7.11)
