Biologically Assisted Control of Selenium in Process Waste Waters.
Larsen-DM; Gardner-KR; Altringer-PB
Ch 22 in Biotechnology in Minerals and Metals Processing Soc Min Eng AIME 1989 :9 pages
The U.S. Bureau of Mines is conducting batch and small-scale continuous laboratory studies on the biologically assisted removal of selenium from process waste waters. Mixed cultures of gram- negative bacteria isolated from several brackish water marshes are capable of reducing selenate [se(VI)] to selenite [se(IV)] and precipitating an amorphous elemental selenium product. Selenium extractions ranged from 80 to 96 pct regardless of the initial selenium concentration. The conditions for rapid bacterial growth and reactor design for optimal selenium removal have been investigated. The mechanisms of bacterial reduction and the rate of selenium removal for scaleup to larger systems are discussed.
Ch. 22 in Biotechnology in Minerals and Metals Processing. Soc. Min. Eng. AIME, 1989, Pp177-185