Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Enhancing Trickling Filter Plant Performance by Chemical Precipitation.
Author Derringto, Robert E. ; Steven, David H. ; Laughli, James E. ;
CORP Author Richardson, Tex.
Year Published 1973
Report Number EPA-S-800685; EPA-11010-EGL; 00835,; 670/2-73-060
Stock Number PB-224 929
Additional Subjects ( Trickling filtration ; Sewage treatment) ; ( Chemical removal(Sewage treatment) ; Phosphorus) ; Biochemical oxygen demand ; Effluents ; Aluminum sulfate ; Iron chlorides ; Cost analysis ; Statistical data ; Computer programming ; Alums ; Sludge drying ; Pilot plants ; Texas ; Tertiary sewage treatment
Library Call Number Additional Info Location Last
NTIS  PB-224 929 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 124p
Two years of plant scale studies indicated metal addition was an effective effluent polishing technique at this conventional wastewater treatment plant. Effluent phosphorus (P), five-day BOD and suspended solids were reduced to 0.5, 5, and 7 mg/l respectively. Aluminum sulfate was more effective than ferric chloride. Alum addition ahead of the final clarifier proved the best arrangement. An optimum mole ratio (metal/phosphorus) 1.6 developed; this ratio shows moles of aluminum fed per mole of incoming total phosphorus. Chemical costs, of which one-third was for transportation, were 5 cents per 1,000 gallons of flow treated, or 36 cents per pound of phosphorus removed when in the 96 percent reduction range. Chemical addition doubled the volume of digested sludge but dewatering on sand beds took half as long as previous conventional operations. During this demonstration the treatment system received some 1.6 mgd of typical domestic discharge, essentially its design loading. Hydraulic loading on clarifiers was minimized by drastic reduction of recirculation flows. (Author)