Record Display for the EPA National Library Catalog


Main Title Zinc precipitation and recovery from viscose rayon waste water. /
Author Roc, David M. ; Allma, Grady
Other Authors
Author Title of a Work
Rock, David M.
Allman, Grady.
CORP Author American Enka Company. Central Engineering Department.
Publisher [Environmental Protection Agency, Water Quality Office] : For sale by the Supt. of Docs., U.S. G.P.O.,
Year Published 1971
Report Number EPA-WQO-12090-ESG; 02364,; 12090-ESG-01/71
Stock Number PB-205 205
OCLC Number 54475397
Subjects Textile waste ; Rayon industry and trade ; Zinc
Additional Subjects ( Zinc sulfates ; Chemical removal(Water treatment)) ; ( Textile industry ; Industrial waste treatment) ; ( Industrial waste treatment ; Zinc sulfates) ; ( Materials recovery ; Zinc sulfates) ; Materials recovery ; Spinning(Staple fibers) ; Textile processes ; Precipitation(Chemistry) ; Pilot plants ; Neutralizing ; Sludge ; Cost estimates ; Operating costs ; Utilization ; Rayon ; Water pollution control ; Zinc hydroxides
Library Call Number Additional Info Location Last
EMBD MF PB-205 205 NRMRL/GWERD Library/Ada,OK 06/18/2004
NTIS  PB-205 205 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 86 pages : illustrations ; 28 cm
A zinc recovery system was developed to recover zinc from dilute zinc sulfate lost both when acid spun yarns are washed and at various stages in the spinning process. The process included neutralization of the waste stream to pH 6.0, sedimentation of insolubles, crystallization of zinc hydroxide in a high pH environment, sedimentation of zinc hydroxide and solubilization of the zinc with sulfuric acid. A pilot plant was constructed and operated. It obtained 98-99% removal efficiency. The zinc hydroxide sludge was easily concentrated. Operating and maintenance costs were estimated. Recovery and sale of 2000 lbs of zinc daily assures recovery of these costs.
"12090ESG01/71." Includes bibliographical references. Microfiche.