Record Display for the EPA National Library Catalog

RECORD NUMBER: 33 OF 217

OLS Field Name OLS Field Data
Main Title Combined Biological and Chemical Treatment for Phosphorus Removal.
Author Mulbarge, Michael C. ; Shifflet, Donald G. ;
CORP Author Robert A. Taft Water Research Center, Cincinnati, Ohio.
Year Published 1970
Stock Number PB-217 405
Additional Subjects ( Sewage treatment ; Chemical removal(Sewage treatment)) ; ( Chemical removal(Sewage treatment) ; Phosphorus) ; ( Alums ; Sewage treatment) ; Precipitation(Chemistry) ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-217 405 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 11p
Abstract
Liquid alum and sodium aluminate were utilized for phosphorus removal at 1.0 and 0.2 million gal./day activated sludge municipal wastewater treatment plants. Phosphorus removals were determined at aluminum to phosphorus ratios up to a limiting point which exhibited a minimum total soluble phosphorus residual of about 1.0 mg./liter. More efficient use of chemical and higher phosphorus removal efficiencies are obtained in a multistage activated sludge system. The type of activated sludge system also influenced chemical phosphorus removals. Excessive effluent suspended solids were found to be more a function of the volatile solids produced to aluminum added ratio than of exceeding a given aluminum to phosphorus ratio or aluminum dosage. Batch studies indicate that aluminum as alum will outperform iron as ferric chloride on a performance/cost basis and that the best point of addition is just before solids-liquid separation. The considerations involved in this type of phosphorus removal system are discussed. (Author)