Water Quality Management - River Dynamics and Integrated River Management - page 582

However, for an example installation in the Passaic River in New Jersey, U.S., the diffuser headers were
laid in a basin excavated 3 m deep at low water, in a channel which is normally 0.6-1.2 m deep (Whipple
et al., 1970).
Fig. 9.13 Schematic diagram of the Devon Avenue Instream Aeration Station in Chicago, U.S. (figure provided by
AECOM-CTE, Chicago, 2008)
Fig. 9.14 Operation of the Devon Avenue Instream Aeration Station in Chicago, U.S. (See color figure at the end of
this topic)
The MWRDGC aeration stations have been operating continuously for more than 25 years, and both
have experienced operation and maintenance problems. The problems with ceramic diffusers include:
z Diffusers can clog due to sediment accumulation
z Periodic replacement of diffusers is required
z Significant shore area is required for blowers or pumps
z May not be applicable to areas where periodic dredging is required
Typically these fine bubble diffuser air systems have an OTE of 10-30 percent (CTE, 2007).