||Technology Evaluation of the Dual Digestion System.
Appleton, A. R. ;
Venosa, A. D. ;
||Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab. ;Montgomery (James M.), Inc., Reston, VA.
Sludge digestion ;
Activated sludge process ;
Aerobic processes ;
Anaerobic processess ;
Schematic diagrams ;
Operating costs ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Full-scale performance and costs of an innovative sludge stabilization process were evaluated at the three plants. The DDS incorporates a 1-day-detention-time, pure oxygen aerobic digester followed in series by an 8-day-detention-time anaerobic digester. Heat of biological oxidation is conserved in the aerobic step; additional heat input is not required for the anaerobic step. The biogas generated by anaerobic digestion is usable elsewhere to help offset oxygen costs. Aerobic operation can be either mesophilic or thermophilic. Process operation, reliability, solids reduction, and capital and operating costs were evaluated.