Selenium Removal from Acidic Waste Water Using Zinc Reduction and Lime Neutralization.
Marchant-WN; Dannenberg-RO; Brooks-PT
NTIS: PB 299 472 :9 pages
The Bureau of Mines improved removal of selenium from zinc smelter acidic gas scrubber effluent by using zinc dust to precipitate soluble selenium prior to lime neutralization. Lime neutralization alone decreased selenium in the waste water from, typically, 6 parts per million to 2 parts per million, whereas the use of zinc dust precipitant gave an effluent containing less than 0.1 Part per million of selenium. The waste treatment operation first was developed on a laboratory scale and later was successfully tested at a smelter site on a 1-gallon-per-minute basis. During the research, a simple and rapid means was developed for determining selenium in waste water; the technique enabled visual semiquantitative selenium determinations that later were confirmed quantitatively by x-ray fluorescence.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 299 472