Record Display for the EPA National Library Catalog

RECORD NUMBER: 9 OF 17

OLS Field Name OLS Field Data
Main Title Engineering assessment of hot-acid treatment of municipal sludge for heavy metals /
CORP Author Camp, Dresser & McKee.
Publisher U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory, Wastewater Research Division,
Year Published 1982
Report Number EPA/600/2-82/014; EPA-68-03-2803
Stock Number PB82-189655
OCLC Number 48463567
Additional Subjects Assessments ; Dewatering ; Technology ; Design ; Performance evaluation ; Economic analysis ; Solubility ; Sludge treatment ; Sewage sludge ; Heavy metals ; Hot acid treatment ; Solid wastes
Holdings
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Status
NTIS  PB82-189655 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 54 pages : illustrations ; 28 cm
Abstract
The hot-acid method for treating sludge was developed by the Walden Division of Abcor, Inc., to remove heavy metals from municipal wastewater sludge. Investigations by Walden have demonstrated the degrees to which heavy metals are solubilized. Sulfuric acid dosage at about 20 to 30 percent of the sludge dry solids followed by heating to 95C for a 30-minute reaction time are the process design parameters. The process is effective in solubilizing about 50 to 90 percent of the concentration of the selected heavy metals. The nitrogen, phosphorus, and organic contents of sludge are also solubilized to varying degrees. The acid-treated sludge was found to be essentially pathogen-free. Dewatering of the treated sludge was shown to be poor. It was determined that untreated sludge requires about four times as much land as hot-acid treated sludge for land application, based on the EPA stipulated cadmium application rate. Hot-acid treatment would not reduce the sludge's metal levels below the USDA recommended guidelines for land application. However, hot-acid treatment clearly improved marketability of a high metals sludge. The hot-acid treatment of sludge would cost about $440 per ton for a 2-mgd waste-water treatment plant and about $140 per ton for a 20-mgd plant. Although hot-acid treatment is costly when compared to conventional sludge treatment practices, its cost effectiveness may be quite good when compared to other systems aimed at controlling the heavy metal contents of sludge.
Notes
"January 1982." Includes bibliographical references. Microfiche.