The Concordia, Kan., wastewater tre...

The Concordia, Kan., wastewater treatment plant has been in operation in the north central Kansas community since 1979 and generally handles a flow of 12 mgd The plant has three 10-foot-deep oxidation ditches used for activated mud processing. One of them is 25 feet in diameter; the other brace are 13 feet.

Officials raise themselves dealing with bearings in an aerator that seized up repeatedly and required replacement at considerable charge Propeller life was reduced to about undivided year.

Ultimately, a switch to a just discovered type of aspirating aerator featuring a solid shaft and sealed roller bearings resolv the question

Raw sewage entering the plant averages 200 mg/1 BOD and 300 mg/1 total S The city uses a standard activated mud process with four aerators in the outside ditch and couple in each of the sum of two units inner ditches.

Dissolved oxygen flushs in all three ditches