Record Display for the EPA National Library Catalog


Main Title Full-Scale Raw Wastewater Flocculation with Polymers.
Author Frees, Paul V. ; Hick, Edward ;
CORP Author District of Columbia Dept. of Sanitary Engineering, Washington.
Year Published 1970
Report Number FWPCA-WPRD-53-01-67; EPA-17050-EJB; 12073,; 17050-EJB-11/70
Stock Number PB-211 240
Additional Subjects ( Sewage treatment ; Flocculating) ; ( Flocculants ; Polyelectrolytes) ; Polymers ; Sedimentation ; Precipitation(Chemistry) ; Performance evaluation ; Optimization ; Suspended sediments ; Elutriation ; Sludge disposal ; Biochemical oxygen demand ;
Library Call Number Additional Info Location Last
NTIS  PB-211 240 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 56p
High molecular-weight organic polyelectrolytes (polymers) have been used successfully to flocculate raw wastewater and to increase the removal of pollutants from the wastewater during primary sedimentation. At present, however, a satisfactory method for predicting the effectiveness of a particular polymer for flocculating solids in a specific wastewater is not available. Three polymers, Dow's anionic A-21 modified with cationic C-31, Hercules' cationic Reten 210, and Calgon's anionic ST 269 with a clay builder, were added to raw wastewater in 240 MGD tests of raw wastewater flocculation. The objectives of polymer flocculation of the raw wastewater were to increase solid capture in the primary tanks, reduce the BOD load to aeration, and permit recycle of the elutriate to the plant's influent. Polymer treatment of raw wastewater did not improve the solids capture in elutriation or permit continuous elutriate recycle.