Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Computer Aided Design of Diffused Aeration Systems.
Author Rossman, L. A. ; Heidman, J. A. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Year Published 1988
Report Number EPA/600/D-88/056;
Stock Number PB88-185608
Additional Subjects Diffusers ; Aerators ; Sewage treatment ; Activated sludge process ; Computer programming ; Blowers ; Performance evaluation ; Bubbles ; Biochemical oxygen demand ; Equipment ; Cost effectiveness ; Air flow ; Fouling ; Maintenance ; Tables(Data) ; Computer aided design ; Computer applications
Library Call Number Additional Info Location Last
NTIS  PB88-185608 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1988
Collation 12p
CADDAS (Computer Aided Design of Diffused Aeration Systems) is a microcomputer-based program that analyzes the cost and performance of diffused aeration used in activated sludge wastewater treatment systems. The program can analyze both coarse bubble and fine pore diffusers as well as detailed blower configurations and operational strategies. For a given set of hourly oxygen demands throughout the year, diffuser performance characteristics, and blower capacity/operational capability, CADDAS computes hourly dissolved oxygen levels, air flow requirements, and blower energy usage over each month of a multi-year planning period. Special attention is paid to the effects of fine pore diffuser fouling on oxygen transfer efficiency and its restoration through cleaning. CADDAS also computes the present worth costs of initial equipment installation, monthly energy usage, annual routine maintenance, and periodic diffuser cleaning.