||Removal of Organic Toxic Pollutants by Trickling Filter and Activated Sludge (Journal Version).
Hannah, S. A. ;
Austern, B. M. ;
Eralp, A. E. ;
Dobbs, R. A. ;
||Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Waste water ;
Activated sludge process ;
Water treatment devices ;
Water purification ;
Volatile organic compounds (VOC)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A standard rate trickling filter was operated in parallel with a conventional activated sludge system to evaluate removals of 21 priority pollutant organics spiked into municipal wastewater. The two processes gave comparable removals of seven volatile compounds where stripping to the atmosphere is a principal removal mechanism. Average removals of volatiles for both processes exceeded 91%. The activated sludge produced removals of 14 semivolatile organics averaging 12% higher than removals by the trickling filter and would be preferred for treatment of that class of compounds. Toxic removal data from two essentially identical activated sludge studies conducted two years apart are compared. While overall results were generally comparable, some significant differences were noted for individual compounds. Allowances should be made for such variability when removal data are used for regulatory purposes.