Bio-leaching of toxic metals from geothermal waste. A preliminary engineering analysis

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The feasibility of a biological facility to treat geothermal sludge from a base case 50-MW double-flash geothermal power plant in the Imperial Valley, California was evaluated. The effect of sludge and nutrient concentration, agitation air bubbling and sterility on the rate of metal solubilization by the bacteria Thiobacillus thiooxidans and ferrooxidans was examined. All experiments were performed in batch flasks and monitored daily for bacterial growth. T. Thiooxidans leached 36% of the zinc in the sludge after 288 hr but leached little chromium. T. ferrooxidans removed 60% of the chromium in the sludge after 250 hr but did not leach ... continued below

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Pages: 72

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Dobryn, D.G.; Brisson, A.L.; Lee, C.M. & Roll, S.M. February 1, 1986.

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Description

The feasibility of a biological facility to treat geothermal sludge from a base case 50-MW double-flash geothermal power plant in the Imperial Valley, California was evaluated. The effect of sludge and nutrient concentration, agitation air bubbling and sterility on the rate of metal solubilization by the bacteria Thiobacillus thiooxidans and ferrooxidans was examined. All experiments were performed in batch flasks and monitored daily for bacterial growth. T. Thiooxidans leached 36% of the zinc in the sludge after 288 hr but leached little chromium. T. ferrooxidans removed 60% of the chromium in the sludge after 250 hr but did not leach zinc. Sludge to medium ratios of greater than 10% were toxic to the microorganisms studied. the experimental results were used to design a biological solid-waste treatment plant. The design basis used was 5 wt % sludge in the leaching vessel with a residence time of 10 days. The non-regulated waste resulting from the treatment plant could be used for land fill or construction materials. The total capital cost for the bio-leaching plant is $3.3 million with an annual operating cost of $690,000. The total cost of this plant is about 0.2 cents/kWh of electricity produced, which is essentially the same cost as hauling the solid waste to a hazardous disposal site. This cost accounts for about 5% of the cost of producing electricity from geothermal power (4 cent/kWh).

Physical Description

Pages: 72

Notes

NTIS, PC A04/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products

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  • Other: DE86015082
  • Report No.: BNL-38523
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/5293588 | External Link
  • Office of Scientific & Technical Information Report Number: 5293588
  • Archival Resource Key: ark:/67531/metadc1063567

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 1986

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 27, 2018, 6:49 p.m.

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Dobryn, D.G.; Brisson, A.L.; Lee, C.M. & Roll, S.M. Bio-leaching of toxic metals from geothermal waste. A preliminary engineering analysis, report, February 1, 1986; United States. (digital.library.unt.edu/ark:/67531/metadc1063567/: accessed August 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.