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Removal of Uncommon Trace Metals by Physical and Chemical Treatment Processes

S. A. Hannah, M. Jelus and J. M. Cohen
Journal (Water Pollution Control Federation)
Vol. 49, No. 11 (Nov., 1977), pp. 2297-2309
Stable URL: http://www.jstor.org/stable/25039450
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Removal of Uncommon Trace Metals by Physical and Chemical Treatment Processes
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Abstract

A continuous-flow pilot plant operating at 0.25 l/s (4 gpm) on Cincinnati raw municipal wastewater was dosed with salts of 11 uncommon trace elements, and removals by each unit process were determined. The elements investigated were silver, beryllium, bismuth, cobalt, molybdenum, antimony, selenium, tin, titanium, thallium and vanadium. Treatment processes included coagulation with lime, ferric chloride, or alum followed by sedimentation, dual-media filtration, and adsorption on granular activated carbon. With the exception of antimony and molybdenum, one or more of the systems would remove >90 percent of the uncommon trace elements. Removals of 12 common trace metals were determined with alum as coagulant; removals greater than 90 percent were obtained for six of them.

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