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Main Title Removal of humic substances and algae by dissolved air flotation
Author Edzwald, James K.; Malley, J. P.
CORP Author Massachusetts Univ., Amherst. Dept. of Civil Engineering.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher Risk Reduction Engineering Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Place Published Cincinnati, Ohio :
Year Published 1989
Report Number EPA/600/2-89/032
Stock Number PB89-214407
OCLC Number 30338724
Subjects Water treatment; Drinking water; Algae; Humus; Water quality; Water supply; Performance evaluation; Particles; Coagulation; Color; Dissolved organic matter; Carbon; Halogen organic compounds; Dissolved air flotation; Halomethanes; Pretreatment(Water); Polyaluminum chloride; Alum
Subject Added Ent Water--Purification--Organic compounds removal; Drinking water--Purification
Holdings
Library   Call Number Additional Info Location Date Modified
ERBD PB89-214407 NERL/ESD-LV Library/Las Vegas,NV 08/25/2000
NTIS PB89-214407 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 183 p. : ill. ; 28 cm.
Abstract Dissolved air flotation (DAF) is used in place of conventional gravity settling as a means to separate low density floc particles from water. The following objectives were: (1) to compare DAF to conventional water treatment of coagulation-flocculation followed by gravity settling (CGS) for removals of particles, color, dissolved organic carbon (DOC), trihalomethane (THM) precursors, and total organic halide (TOX) precursors; (2) to examine the effects of raw water quality, water temperature, chemical variables, flocculation period prior to DAF, and DAF design and operating variables on DAF performance; and (3) to evaluate alum and polyaluminum chloride (PAC1) as pretreatment coagulants for DAF. The results of the DAF experiments using synthetic and natural waters showed that good DAF treatment requires good coagulation. The experimental results also showed that flotation without a prior flocculation period is effective. For waters containing humic substances, there was no significant difference in the removal of UV, true color, DOC, and dissolved organic halide precursors (THM and TOX) between DAF and conventional treatment.
Notes "July 1989." "EPA/600/2-89/032."
Supplementary Notes Sponsored by Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Author Added Ent
Malley, James P.
Corporate Au Added Ent Risk Reduction Engineering Laboratory (U.S.)
PUB Date Free Form {1989}
NTIS Prices PC A10/MF A01
BIB Level m
OCLC Time Stamp 20000823181342
Cataloging Source OCLC/T
Language eng
Origin OCLC
Type MERGE
OCLC Rec Leader 01088nam 2200289Ia 45020