Determination of the vertical velocity distribution of floatables in CSOs

Control of floatables, since April 1994, is one of the nine minimum control s required by the U.S.EPA (United States Environmental Protection Agency) f or CSO (Combined Sewer Overflows) control policy compliance. Municipalities must control and intercept floatables at their overflow sites. Efficient i nterception of these floatables requires prior characterisation. To accompl ish this floatables from the Montreal (Canada) region were intercepted duri ng wet weather events. Many characteristics were analysed, but a special em phasis was given to the measurement of the vertical velocity of the floatab les. This vertical velocity was measured using a column that could be rotat ed around its central axis. Results have shown that 80% of the intercepted floatables have a vertical velocity of over 0.07 m/s. (C) 1999 IAWQ Publish ed by Elsevier Science Ltd. All rightsd reserved.