||Chemical coagulation/mixed-media filtration of aerated lagoon effluent /
Grutsch, J. F. ;
Mallatt, R. C. ;
Peters., A. W.
||American Oil Co., Yorktown, Va.;Robert S. Kerr Environmental Research Lab., Ada, Okla.
|| National Environmental Research Center, Office of Research and Development, U.S. Environmental Protection Agency ; For sale by the Supt. of Docs., U.S. Govt. Print. Off.,
||EPA-660/2-75-025; EPA-S-803026; EPA-ROAP-21AZP
Aerated package treatment systems. ;
Industrial waste treatment ;
Operating costs ;
Cold weather construction ;
Petroleum products ;
Brackish water ;
Aeration ponds ;
||Region 3 Library/Philadelphia, PA
||Region 4 Library/Atlanta,GA
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 103 pages : illustrations ; 27 cm.
Operating problems and the effect of operating variables were investigated during full-scale plant operations in the scalping mode. Influent suspended solids concentration and water temperature were the most significant independent variables. Mechanical limitations were studied, including a filter bed disturbance that necessitated a total bed replacement. High, localized backwash velocity caused the invisible disturbance which reduced turbidity removal from about 80% to 50%. Diagnostic procedures, design changes, and the costs of operation and maintenance are reported. A cold weather study showed that a three-chemical destablization pretreatment system is required for filtration of biocolloids in brackish water. Determination of the optimal three-chemical destabilization system using zeta potentials required evaluation of zeta potentials in a manner which sorted out the effect of double-layer repression. The colloid destabilization mechanisms of charge neutralization and bridging were required for optimal filter performance. For colder water temperatures, even with optimal chemical treatment, the filter hydraulic loading must be decreased. The change in hydraulic loading with temperature related directly to the water's viscosity.
"Grant #S803026-01; program element 1BB036; ROAP/Task no. 21AZP/028-037." "June 1975." Includes bibliographical references (page 67).