Record Display for the EPA National Library Catalog


Main Title Fine pore diffuser system evaluation for the Green Bay Metropolitan Sewerage District
Author Marx, James J.
CORP Author RUST Environment and Infrastructure, Sheboygan, WI.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher Risk Reduction Engineering Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1994
Report Number EPA/600/R-94/093
Stock Number PB94-200813
OCLC Number 48155849
Additional Subjects Water pollution control ; Sewage treatment plants ; Diffusers ; Off-gas systems ; Industrial waste treatment ; Field tests ; Fines ; Ceramics ; Membranes ; Fouling ; Wisconsin ; Activated sludge process ; Comparison ; Oxygenation ; Cleaning ; Performance evaluation ; Long term effects ; Design criteria ; Fine pore aeration systems ; Oxygen transfer efficiency ; Green Bay(Wisconsin)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ELBD  EPA 600-R-94-093 AWBERC Library/Cincinnati,OH 10/19/2001
NTIS  PB94-200813 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation ix, 101 p. : ill. ; 28 cm.
The Green Bay Metropolitan Sewerage District retrofitted two quadrants of their activated sludge aeration system with ceramic and membrane fine pore diffusers to provide savings in energy usage compared to the sparged turbine aerators originally installed. Because significant diffuser fouling was expected, the two diffuser types were closely monitored over an 18-month period. The oxygen transfer efficiencies of the full-scale systems were measured using off-gas techniques. The effects of diffuser fouling and the effectiveness of cleaning procedures were evaluated in the laboratory using dynamic wet pressure and steady-state clean water oxygen transfer tests. Although fouling was significant on both types of diffusers, cost-effective cleaning procedures were developed. The ceramic disc diffuser provided better long-term performance than the membrane tube diffusers, which irreversibly lost oxygen transfer efficiency with time in use. Collectively, the fine pore diffuser systems provided a 30% savings in electrical power usage compared to the original sparged turbine aerators.
Project officer: Richard C. Brenner. Cooperative agreement CR812167. Photocopy.