Main Title |
Backwash of granular filters used in wastewater filtration / |
Author |
Cleasby, John L. ;
Cleasby, J. L. ;
Baumann., E. R.
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Other Authors |
|
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 |
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
EJBD |
EPA 600-2-77-016 |
c.1 |
Headquarters Library/Washington,DC |
04/16/2014 |
ELBD ARCHIVE |
EPA 600-2-77-016 |
Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
ESAD |
EPA 600-2-77-016 |
|
Region 10 Library/Seattle,WA |
03/23/2010 |
NTIS |
PB-266 693 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
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). |