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Main Title Treatment of metal finishing wastes by sulfide precipitation /
Author Schlauch, R. M. ; Epstein., Arthur C.
Other Authors
Author Title of a Work
Epstein, Arthur C.
CORP Author Permutit Company.; Metal Finishers' Foundation.
Publisher Industrial Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1977
Report Number EPA 600/2-77-049; EPA-R-8-2914
Stock Number PB-267 284
OCLC Number 06064717
Subjects Metals--Finishing--Waste disposal ; Precipitation (Chemistry) ; Sulfides
Additional Subjects Metals--Finishing--Waste disposal ; Precipitation (Chemistry) ; Sulphides ; Water pollution control ; Metal finishing ; Precipitators ; Performance evaluation ; Precipitation(Chemistry) ; Industrial wastes ; Sludge ; Iron sulfides ; Calcium hydroxide ; Comparisons ; Process charting ; Design criteria ; Capitalized costs ; Operating costs ; Electroplating ; Dewatering ; Experimental design ; Pilot plants ; Complex compounds ; Cost analysis ; Heavy metals ; Sludge treatment ; Sulfex process
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA-600/2-77-049 Headquarters Library/Washington,DC 02/28/2007
ELBD ARCHIVE EPA-600/2-77-049 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ERAD  EPA 600/2-77-049 Region 9 Library/San Francisco,CA 09/17/2012
ESAD  EPA 600-2-77-049 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-267 284 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation x, 76 p. : ill. ; 28 cm.
This project involved precipitating heavy metals normally present in metal finishing wastewaters by a novel process which employs ferrous sulfide addition (Sulfex), as well as by conventional treatment using calcium hydroxide for comparison purposes. These studies consisted of laboratory jar tests and bench scale tests to determine the chemical and physical requirements for the precipitation of the heavy metals and the subsequent dewatering of the resulting sludges. Following the laboratory tests, pilot plant tests were made to confirm the validity of the laboratory test results and provide realistic operating data. As a result, it was demonstrated that Sulfex is a technically viable process that is superior to conventional hydroxide precipitation for removal of copper, cadmium, nickel, and zinc from a given influent. And, when operated in the pH 8-9.0 range, the Sulfex process will remove total chromium to a concentration which is less than or equal to that from a conventional hydroxide precipitation process. Hexavalent chromium can be removed by Sulfex in a one-step operation. The effluent quality from either process is dependent on the type and concentration of complexing agents present in the influent.
EPA-600/2-77-049. Grant. no. R802924. Bibliography: p. 75.