Record Display for the EPA National Library Catalog

RECORD NUMBER: 202 OF 2131

OLS Field Name OLS Field Data
Main Title Backwash of granular filters used in wastewater filtration /
Author Cleasby, John L. ; Cleasby, J. L. ; Baumann., E. R.
Other Authors
Author Title of a Work
Baumann, E. Robert.
CORP Author Iowa State Univ., Ames.;Municipal Environmental Research Lab., Cincinnati, Ohio. Wastewater Research Div.
Publisher Municipal Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1977
Report Number EPA/600/2-77/016; EPA-R-802140; EPA-ROAP-21ASQ-13
Stock Number PB-266 693
OCLC Number 06546854
Subjects Sewage--Purification--Filtration. ; Sewage--Purification--Filtration.
Additional Subjects Sewage filtration ; Fluid filters ; Granular materials ; Backwashing ; Suspended solids ; Design ; Cleaning ; Performance evaluation ;
Internet Access
Description Access URL
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9101FNWU.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EJAD  EPA 600/2-77-016 Region 3 Library/Philadelphia, PA 06/16/2000
EJBD ARCHIVE EPA 600-2-77-016 Headquarters Library/Washington,DC 04/10/2014
EJBD  EPA 600-2-77-016 c.1 Headquarters Library/Washington,DC 04/16/2014
EKAM  600/2-77/016 Region 4 Library/Atlanta,GA 04/09/1999
ESAD  EPA 600-2-77-016 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-266 693 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 xxiv, 357 p. : ill. ; 28 cm.
Abstract
The use of deep granular filters in waste treatment is of growing importance. The key to long-term operating success of such filters is proper bed design and adequate bed cleaning during backwashing. Cleaning granular filters by water backwash alone to fluidize the filter bed is inherently a weak cleaning method because particle collisions do not occur in a fluidized bed and thus abrasion between the filter grains is negligible. Due to the inherent weakness of water backwashing cited above, auxiliary means of improving filter bed cleaning are essential for wastewater filters. Three auxiliary methods were compared in a wastewater pilot filtration study. The most effective backwash was provided by air scour and water backwash simultaneously at subfluidization velocities. The other two methods, surface and subsurface wash auxiliary or air scour prior to water fluidization wash were about comparable in effectiveness. The performance of coarse sand, dual-, and triple-media filters was compared, and the backwashing routines appropriate for each media are discussed. A number of investigations concerning the design and backwashing of dual media filters are presented.
Notes
EPA-600/2-77-016. Includes bibliographical references (p. 345-354).