Record Display for the EPA National Library Catalog

RECORD NUMBER: 8 OF 13

OLS Field Name OLS Field Data
Main Title Lime Precipitation in Municipal Wastewaters.
Author Stamber, John B. ; Bisho, Dolloff F. ; Warne, H. Paul ; Grigg, Samuel H. ;
CORP Author Robert A. Taft Water Research Center, Cincinnati, Ohio. Advanced Waste Treatment Research Lab.
Year Published 1970
Stock Number PB-217 626
Additional Subjects ( Sewage treatment ; Chemical removal(Sewage treatment)) ; ( Chemical removal(Sewage treatment) ; Phosphorus) ; ( Precipitation(Chemistry) ; Phosphorus) ; Calcium oxides ; Inorganic phosphates ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-217 626 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 9p
Abstract
Liming of District of Columbia raw or treated wastewater to pH 10 insolubilized the various forms of phosphorus in the wastewater, but removals to residuals of 0.3 mg./liter as P occurred only above pH 11.5, where precipitated magnesium hydroxide flocculated the turbidity. Nitrification of the wastewater during biochemical (secondary) treatment reduced the lime requirement for precipitation, the amounts of sludge from precipitation, and also improved phosphorus removals. Liming of organic free solutions insolubilized mixtures of ortho and polyphosphates by pH 10, although insolubilization of meta or tripolyphosphate alone required a pH above 11. The degree of biochemical oxidation significantly influenced the phosphorus removals, while temperature and ionic strength did not. (Author)