OXYGEN-TRANSFER IN GRAVITY FLOW SEWERS

Oxygen transfer to water in gravity flow pipes has been studied in a 2 4 m long, 0.225 m diameter sewer. Laboratory tests were conducted wher e the slope and flow in the sewer could be varied independently. The c lean water reaeration test was used to determine the oxygen transfer. The K-L value for the oxygen transfer was found to be a function of en ergy dissipation and mean hydraulic depth. The results are discussed i n relation to oxygen transfer determinations in flumes and field studi es of oxygen transfer in sewers.