Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Study of activated sludge separation by dynamic straining /
Author Dumanowski, James. ; Strom., Arvid
Other Authors
Author Title of a Work
Strom, Arvid,
CORP Author FMC Corp., Itasca, Ill. Environmental Equipment Div.;Municipal Environmental Research Lab., Cincinnati, Ohio.
Publisher Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service,
Year Published 1978
Report Number EPA-600/2-78-070
Stock Number PB-284 903
OCLC Number 04146563
ISBN pbk.
Subjects Sewage--Purification--Activated sludge process.
Additional Subjects Activated sludge process ; Sewage treatment ; Strainers ; Pilot plants ; Clarification ; Feasibility ; Sand filtration ; Flocculation ; Performance evaluation ; Particle sizes ; Biochemical oxygen demand ; Separation ; Design criteria ; Equipment ; Process charting ; Dynamic straining
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  TD756.D84 Region 1 Library/Boston,MA 04/29/2016
EJAD  EPA 600/2-78-070 Region 3 Library/Philadelphia, PA 06/16/2000
EJBD ARCHIVE EPA 600-2-78-070 Headquarters Library/Washington,DC 09/28/2009
EJBD  EPA 600-2-78-070 c.1 Headquarters Library/Washington,DC 03/17/2014
EKAM  EPA-600/2-78-070 Region 4 Library/Atlanta,GA 09/25/1998
ELBD  EPA 600-2-78-070 AWBERC Library/Cincinnati,OH 11/20/1998
ESAD  EPA 600-2-78-070 Region 10 Library/Seattle,WA 03/23/2010
Collation viii, 55 pages : illustrations ; 28 cm.
Pilot plant studies were conducted on domestic wastewater to determine the feasibility of replacing or augmenting conventional activated sludge gravitational clarifiers by dynamic straining. This work was a continuation of the successful program accomplished under EPA report numbered PB-242 848. In the prior program, two dynamic strainers in series were employed. In this program, less expensive techniques for polishing the primary strainer effluent were investigated. Phase I covered pilot operations with the strainer in the aeration tank of an activated sludge plant producing a nitrified effluent. Phase II involved a non-nitrified effluent. In both phases, upflow and downflow sand filtration, settling, and flocculation-settling of the strainer effluent were investigated. Phase I flows were low but correlated well with the previous studies of strainer operating variables. Strainer effluent averaged 35 mg/l suspended solids with mixed liquor suspended solids (MLSS) of 6800 mg/l. The upflow and downflow sand filters, operating on strainer effluent, produced effluents of 8 and 3 mg/l suspended solids, respectively. Phase II, which called for high flows and high BOD loadings, was plagued with an intense growth of filamentous microorganisms, foaming, and development of a 'syrupy' mixed liquor. Proper strainer throughputs could not be maintained. Flow rates were not reproducible and did not correlate with prior work.
Contract no. 68-03-0427. Issued June 1978. Includes bibliographical references.