WASTEWATER- By Rick Lallish
What is the expected or recommended time it should take for the contents in an oxidation ditch to travel the complete circuit of the ditch or go from rotor to rotor?A. 30 seconds to 1.5 minutesB. 2.0 minutes to 2.5 minutesC. 3.0 minutes to 6.0 minutesD. 7.5 minutes to 9.0 minutesAnswer: C. For proper treatment time and flow velocities, the textbooks say the velocity in the ditch should be maintained at 1.0 to 1.5 feet per second. This will prevent the organics from settling in the ditch. This should allow the treatment contents to flow around the ditch or rotor to rotor in
