Record Display for the EPA National Library Catalog


Main Title Operational Stability of the Extended Aeration Process.
Author Gaudy, J, A. F. ;
CORP Author Oklahoma State Univ., Stillwater. Dept. of Civil Engineering.
Year Published 1971
Report Number OWRR-A-017-OKLA; 04784; A-017-OKLA(1)
Stock Number PB-206 909
Additional Subjects ( Activated sludge process ; Sludge digestion) ; ( Sewage treatment ; Activated sludge process) ; ( Aeration ; Activated sludge process) ; Digestion(Decomposition) ; Pilot plants ; Metabolism ; Biomass ; Aerobic processes ; Biodecomposition ; Hydrolysis ; Suspended sediments ;
Library Call Number Additional Info Location Last
NTIS  PB-206 909 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 330p
The project was initiated to determine if any activated sludge process could operate with total cell recycle over an extended period of time. Previous researchers had concluded that such a process (the extended aeration or total oxidation activated sludge process) could not function and that cell or sludge wastage would be necessary. A laboratory scale pilot plant activated sludge process was operated in which positive control of sludge retention in the system was obtained by passing all contents through a centrifuge and returning the separated biomass to the aeration chamber. This system was operated for three years and there was no evidence of metabolic failure; excellent purification was obtained. It was found that hydrolyzed sludge was a readily available substrate for the remaining (unhydrolyzed) sludge. Laboratory pilot plant research has been accomplished which indicates that the new process holds considerable promise. (Author)