Record Display for the EPA National Library Catalog


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; PB284903
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
EJBD  EPA 600-2-78-070 Headquarters Library/Washington,DC 03/17/2014
ELBD ARCHIVE EPA 600-2-78-070 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
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
NTIS  PB-284 903 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 55 pages : illustrations, figures, tables ; 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.
"June 1978." Includes bibliographical references (page 42). U.S. Environmental Protection Agency Contract No. Contract Number: 68-03-0427, Program Element No. 1BC611, SOS#3, Task D-1/21.