| Main Title |
Downflow granular filtration of activated sludge effluents / |
| Author |
Bowker, Robert P. G.
|
| CORP Author |
District of Columbia Dept. of Environmental Services, Washington. EPA-DC Pilot Plant.;Municipal Environmental Research Lab., Cincinnati, Ohio. Wastewater Research Div. |
| Publisher |
Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service, |
| Year Published |
1977 |
| Report Number |
EPA/600/2-77/144; EPA-68-03-0349 |
| Stock Number |
PB-272 317 |
| Subjects |
Sewage--Purification--Filtration ;
Sewage--Purification--Activated sludge process ;
Water--Purification--Filtration
|
| Additional Subjects |
Filters ;
Water pollution control ;
Activated sludge process ;
Filtration ;
Performance evaluation ;
Design criteria ;
Flow rate ;
Backwashing ;
Phosphorus ;
Pilot plants ;
Effluents
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB-272 317 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
viii, 48 pages : illustrations ; 28 cm. |
| Abstract |
The performance of downflow granular filters subjected to effluents from activated sludge processes was investigated at the EPA-DC Pilot Plant in Washington, D.C. Several media combinations were investigated, including both single anthracite and dual anthracite-sand configurations. Effluents from step aeration, plug flow, and completely mixed activated sludge systems were used as feeds. Breakthrough of the suspended solids into the effluent occurred with both the 1.65 mm and 2.0 mm effective size (E.S.) single anthracite configurations, becoming more evident at the higher flow rates. A dual media filter, consisting of 2.0 mm E.S. coal over 0.9 mm E.S. sand, exhibited the most desirable characteristics for filtration of the secondary effluents investigated. The advantages were longer run times and higher suspended solids loadings with virtually no deterioration of effluent quality. A backwash study conducted at a variety of backwash flowrates showed that a 13 percent bed fluidization was achieved with the coarse media (2.0 mm E.S. coal/0.9 mm E.S. sand) at a flow rate of 1.43 cu m/min/sq m (35 gpm/sq ft). This was sufficient to effectively cleanse the media. |
| Notes |
Includes bibliographical references (page 44). Microfiche. |
| Place Published |
Cincinnati, Ohio : |
| Corporate Au Added Ent |
Municipal Environmental Research Laboratory. |
| Title Ser Add Ent |
Research reporting series Environmental protection technology ; |
| PUB Date Free Form |
{1977} |
| Series Title Untraced |
Environmental protection technology series ; EPA 600/2-77-144 |
| NTIS Prices |
PC A04/MF A01 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| OCLC Time Stamp |
20031031122921 |
| Language |
eng |
| Origin |
NTIS |
| Type |
MERGE |
| OCLC Rec Leader |
01306nam 2200289Ka 45020 |
