Accession Number : ADA322500

Title :   Reclamation of Metals from Water with a Silage-Microbe Ecosystem.

Descriptive Note : Final rept. 2 Aug 89-15 Oct 90,

Corporate Author : CLARK ATLANTA UNIV GA

Personal Author(s) : Bender, Judith

PDF Url : ADA322500

Report Date : MAR 1991

Pagination or Media Count : 39

Abstract : Cyanobacteria mats, generated by ensiled grass enrichments, were adapted for high level metal and metalloid tolerance and subsequently evaluated for their potential in metal sequestering and metalloid reduction. Excised mats sections, applied to mixed metal solutions, containing concentrations of Zn: 3250, Cu: 279, Cd: 28 (mg/L), showed the following removals, Zn: 78%; Cu and Cd: 99% in 28 days. Mats immobilized on glass wool and packed in columns showed the following - removals of the mixed solution in a 3 h retention time, Cd: 83%, Cu: 88%, Zn: 92%. Immobilized mats layered in a flow through baffle (flow rate of 2-2.5 ml/min), removed an average of 96.7% Cd in four 500-ml flows of 20 mg/L. Mat ecosystems contained simultaneous oxic and anoxic conditions. High reducing potentials within the system rapidly and effectively reduced selenate to elemental selenium. Mixed microbial mats demonstrated good potential for removal and transformation of certain heavy metals and metalloids.

Descriptors :   *STRAINS(BIOLOGY), *ECOSYSTEMS, *TOLERANCES(PHYSIOLOGY), *METALLOID ALLOYS, *SELENIUM COMPOUNDS, METALS, WATER, GLASS, REDUCTION, SOLUTIONS(GENERAL), TOLERANCE, MIXING, SALTS, ENRICHMENT, MICROORGANISMS, WOOLEN TEXTILES, GRASSES, ANOXIA, RECLAMATION, BAFFLES, MATS, ANTIMICROBIAL AGENTS, METALLOIDS.

Subject Categories : Medicine and Medical Research
      Microbiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE