||Sulfide precipitation of heavy metals /
Robinson, Alan K. ;
Sum, Joyce C.
||Boeing Commercial Airplane Co., Seattle, WA.;Industrial Environmental Research Lab., Cincinnati, OH.
|| Industrial Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
||EPA/600/2-80/139; D6-42205-5; EPA-S-805413
Sewage--Purification--Heavy metals removal. ;
Sewage disposal plants. ;
Precipitation (Chemistry) ;
Industrial waste treatment ;
Water pollution control ;
Inorganic sulfides ;
Performance evaluation ;
Calcium oxides ;
Capitalized costs ;
Operating costs ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||121 pages : illustrations ; 28 cm.
||The research program was initiated with the objective of evaluating a new process, the sulfide precipitation of heavy metals from industrial wastewaters. The process was expected to effect a more complete removal of heavy metals than conventional lime processing because of the much lower solubilities of metal sulfides than hydroxides. Five processes were compared in bench-scale, continuous-flow equipment: conventional lime processing, conventional lime processing plus filtration, lime with a sulfide polishing and filtration, lime with sulfide, and lime with sulfide plus filtration. Samples of actual wastewaters from 14 metal working industries (including Boeing) were processed through the bench-scale equipment using all five processes. Reductions in the concentrations of cadmium, chromium, copper, nickel, and zinc, plus selected other metals were measured by atomic absorption chemical analysis. Capital and operating costs for the five processes were comprised for three plants sizes: 37.85 cu m/day (10,000 gal/day), 757 cu m/day (200,000 gal/day), and 1,893 cu m/day (500,000 gal/day). The report recommends that, to reduce the levels of cadmium, copper, nickel, or zinc, from a wastewater treatment plant using conventional lime processing, the addition of a final filtration should be considered first. The sulfide process did not significantly reduce the levels of these metals. Details are included on the use of a specific ion electrode for the control of sulfide additions. The report does not include comparison testing of the commercial Sulfex process.
||Prepared for U.S. Environmental Protection Agency, Office of Research and Development, Industrial Environmental Research Laboratory, Cincinnati, Ohio, submitted by Boeing Commercial Airplane Company, Manufacturing Research and Development, under grant S805413. Includes bibliographical references (pages 40-41). Microfiche.
||Cincinnati, Ohio :
|Corporate Au Added Ent
||Industrial Environmental Research Laboratory (Cincinnati, Ohio) ; Boeing Commercial Airplane Company. Manufacturing Research and Development.
|Title Ser Add Ent
||Research reporting series Environmental protection technology ;
|PUB Date Free Form
|Series Title Untraced
||Environmental protection technology series; EPA-600/2-80-139
||PC A06/MF A01
|OCLC Time Stamp
|OCLC Rec Leader
||01692nam 2200337Ka 45020