Record Display for the EPA National Library Catalog


Main Title Demonstration of Thermophilic Aerobic-Anaerobic Digestion at Hagerstown, Maryland.
Author Haas, O. W. ;
CORP Author Union Carbide Corp., Tonawanda, NY. Linde Div. ;Hagerstown Water Pollution Control Dept., MD.;Municipal Environmental Research Lab., Cincinnati, OH. Wastewater Research Div.
Year Published 1984
Report Number EPA-S-805823; EPA/600/2-84/142;
Stock Number PB84-238252
Additional Subjects Sludge disposal ; Sewage treatment ; Anaerobic processes ; Aerobic processes ; Solid wastes disposal ; Design criteria ; Performance evaluation ; Thermophiles ; Anaerobic digestion ; Aerobic digestion ; Sludge treatment ; Sewage sludge ; Energy conservation ; Hagerstown(Maryland) ; Pathogens
Library Call Number Additional Info Location Last
NTIS  PB84-238252 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 121p
This report describes the successful operation of a new and novel approach to digestion of sludge at the Hagerstown wastewater treatment plant. The process, known as dual digestion, involved the coupling of a full-scale experimental aerobic reactor to an existing full-scale anaerobic digester for the treatment of Hagerstown's raw sludge. In the process, sludge is aerobically digested at thermophilic conditions, using pure oxygen for about one day, followed by a longer period of 8 to 16 days of mesophilic (or thermophilic) anaerobic digestion. The system handled 16,400 gallons of raw sludge per day with average autothermal temperature in the aerobic digester of 51C. Pathogen analyses of the raw and digested sludge samples indicated the process significantly reduced pathogen levels beyond that achieved by conventional anaerobic digestion practice. The dual digestion process proved itself to be an effective sludge stabilization process achieving an overall volatile solids destruction of 42 percent.