Olli Tuovinen - Academia.edu (original) (raw)

Papers by Olli Tuovinen

Research paper thumbnail of Molecular biological enhancement of coal biodesulfurization

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Research paper thumbnail of Molecular biological enhancement of coal biodesulfurization

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Research paper thumbnail of Acid and ferric sulfate bioleaching of uranium ores: A review #

Journal of Cleaner Production, Aug 1, 2020

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Research paper thumbnail of Biological Leaching of Shales – a Review

Oil Shale, 1998

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Research paper thumbnail of Evaluation of Drip Irrigation Emitters Distributing Primary and Secondary Wastewater Effluents

Irrigation and Drainage Systems Engineering, 2016

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Research paper thumbnail of Methanotrophs dominate methanogens and act as a methane sink in a subterranean karst cave

Science of The Total Environment, Sep 1, 2023

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Research paper thumbnail of Nitrate determines the bacterial habitat specialization and impacts microbial functions in a subsurface karst cave

Frontiers in Microbiology, Feb 9, 2023

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Research paper thumbnail of Effect of the type and concentration of cellulose and temperature on metabolite formation by a fermentative thermophilic consortium

International Journal of Hydrogen Energy, Jun 1, 2019

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Research paper thumbnail of Acid Leaching of Cu and Zn from a Smelter Slag with a Bacterial Consortium

Advanced Materials Research, Nov 1, 2015

This study was undertaken to determine the leaching of Cu and Zn from a smelter slag in acidic, s... more This study was undertaken to determine the leaching of Cu and Zn from a smelter slag in acidic, sulfate-rich solutions with, and without, mesophilic Fe-and S-oxidizing bacteria. Cu in the slag was mostly distributed in fayalite, Fe-deficient Cu-sulfides and metallic Cu, and Zn was associated with fayalite, magnetite and glassy silicates. The test culture was enriched from acid mine water using mineral salt growth media supplemented with 4.5 g Fe2+ L-1 and 10 g S0 L-1. The bioleaching experiments were carried out in shake flasks at 27 °C and chemical controls were included. The slag sample was pre-leached for 24 h to partially satisfy the acid demand before the leaching experiments at 10% pulp density. In the bioleaching experiments, 69-83% Cu and 4.1-14% Zn were dissolved in 25 days at pH 2.0-2.2. The highest extent of bioleaching was with S0 as the substrate. The efficiency of the bioleaching depended on H2SO4 generation from the added S0. The activities of the bacteria were not adversely affected by the dissolved metals. The maximum yields of chemical leaching were 68% Cu and 3.7% Zn.

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Research paper thumbnail of An ultraviolet spectrophotometric method for the determination of pyrite and ferrous ion oxidation by Thiobacillus ferrooxidans

Applied Microbiology and Biotechnology, Jul 1, 1986

ABSTRACT

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Research paper thumbnail of Solid phase changes in chemically and biologically leached copper smelter slag

Minerals Engineering, May 1, 2017

Abstract Pyrometallurgical processes for sulfide concentrates produce slag waste materials that c... more Abstract Pyrometallurgical processes for sulfide concentrates produce slag waste materials that contain multiple metals as carry-over impurities. Varied quantities of the metal content can be solubilized from the slag through chemical acid leaching or bioleaching. In this study, copper smelter slags were leached with and without iron- and sulfur-oxidizing bacteria in acid, sulfate-rich solutions and solid phase changes were determined. The samples (10% pulp density) were leached at 28 °C in stirred tanks at pH 2.5 and 3.0. The duration of the experiment was 37 d and the adjusted pH decreased to 2.3 in both sets of experiments. The primary metals of interest in the slag were Cu and Zn, with minor amounts of Ni and Co, and As, Sb, and Pb at trace levels. The metals in the slag were distributed in fayalite, glassy silicates and magnetite phases as well as minor amounts in oxides, metallic Cu and sulfides. Based on the solution analyses, the dissolution yields were 44% and 34% for Cu, 14% and 13% for Zn and Co, and 4.5% and 4.0% for Ni at initial pH values of 2.5 and 3.0, respectively. Fayalite was the most reactive mineral and Cu-sulfides were particularly refractory. The elemental composition of leached residues was matched with solid phase changes and the distribution of metals in the mineral phases.

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Research paper thumbnail of Growth of <i>Chlorella vulgaris</i> and associated bacteria in photobioreactors

Microbial biotechnology, Sep 21, 2011

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Research paper thumbnail of Oxidative dissolution of research-grade minerals by Thiobacillus ferrooxidans and Thiobacillus thiooxidans

Revista De Microbiologia, 1997

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Research paper thumbnail of Weathering of mica and feldspar in a black schist ore sample during bacterial leaching of iron sulfides

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Research paper thumbnail of Molecular biological enhancement of coal desulfurization. Eleventh quarterly technical progress report

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Research paper thumbnail of Iron Speciation in Acid Mine Effluents: Chemical and Microbial Controls : Final Report

Ohio State University. Water Resources Center eBooks, 1983

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Research paper thumbnail of Inhibition of ferrous ion oxidation in Thiobacillus ferrooxidans in the presence of oxyanions of sulfur and phosphorus

Coal science and technology, 1986

Ferrus iron oxidation by growing cultures of Thiobacillus ferrooxidans was sensitive to negative ... more Ferrus iron oxidation by growing cultures of Thiobacillus ferrooxidans was sensitive to negative catalysis (inhibition) by selected oxyanios of sulfur. The relative order of negative catalytic activity for the sulfoxyanions was S_20_5^(2-) > S_20_3^(2-) > S_20_4^(2-) > S_40_6^(2-). Inhibition by the sulfoxyanions was greater at μm 1.5 than at pH 2.0. A mechanism involving the formation of radical intermediates, HO_2,-OH, HSO_3, HSO_5, H_2O_4, and HS_3O_3, induced by Fe(II) and Fe(III) complexes is proposed to account for the observed inhibitory effects. Orthophosphate, pyrophosphate, and tripolyphosphate compounds were also inhibitory to ferrous iron oxidation by T. ferrooxidans. Orthophosphates were increasingly at high concentrations (200-300 mM) whereas the apparent toxicity of pyrophosphate and tripolyphosphate was inversely related to concentration over the range of 50-300 mM with no apparent at pH dependency at pH ≤ 2. Equilibrium models are presented to explain the relative effect of the phosphates in terms of phosphate precipitates, which were actually observed , and soluble complexes, which have an effect on the thermodynamics of electron transfer.

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Research paper thumbnail of Analytical note: catalytic effects of sulfur and other compounds in the azide-iodine test

Journal American Water Works Association, Feb 1, 1981

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Research paper thumbnail of Biogenic hydrogen and methane production from Chlorella vulgaris and Dunaliella tertiolecta biomass

Biotechnology for Biofuels, 2011

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Research paper thumbnail of The Role of Microbial Activity in Suppression of Damping-Off Caused by<i>Pythium ultimum</i>

Phytopathology, 1988

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Research paper thumbnail of Molecular biological enhancement of coal biodesulfurization

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Research paper thumbnail of Molecular biological enhancement of coal biodesulfurization

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Research paper thumbnail of Acid and ferric sulfate bioleaching of uranium ores: A review #

Journal of Cleaner Production, Aug 1, 2020

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Research paper thumbnail of Biological Leaching of Shales – a Review

Oil Shale, 1998

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Research paper thumbnail of Evaluation of Drip Irrigation Emitters Distributing Primary and Secondary Wastewater Effluents

Irrigation and Drainage Systems Engineering, 2016

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Research paper thumbnail of Methanotrophs dominate methanogens and act as a methane sink in a subterranean karst cave

Science of The Total Environment, Sep 1, 2023

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Research paper thumbnail of Nitrate determines the bacterial habitat specialization and impacts microbial functions in a subsurface karst cave

Frontiers in Microbiology, Feb 9, 2023

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Research paper thumbnail of Effect of the type and concentration of cellulose and temperature on metabolite formation by a fermentative thermophilic consortium

International Journal of Hydrogen Energy, Jun 1, 2019

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Acid Leaching of Cu and Zn from a Smelter Slag with a Bacterial Consortium

Advanced Materials Research, Nov 1, 2015

This study was undertaken to determine the leaching of Cu and Zn from a smelter slag in acidic, s... more This study was undertaken to determine the leaching of Cu and Zn from a smelter slag in acidic, sulfate-rich solutions with, and without, mesophilic Fe-and S-oxidizing bacteria. Cu in the slag was mostly distributed in fayalite, Fe-deficient Cu-sulfides and metallic Cu, and Zn was associated with fayalite, magnetite and glassy silicates. The test culture was enriched from acid mine water using mineral salt growth media supplemented with 4.5 g Fe2+ L-1 and 10 g S0 L-1. The bioleaching experiments were carried out in shake flasks at 27 °C and chemical controls were included. The slag sample was pre-leached for 24 h to partially satisfy the acid demand before the leaching experiments at 10% pulp density. In the bioleaching experiments, 69-83% Cu and 4.1-14% Zn were dissolved in 25 days at pH 2.0-2.2. The highest extent of bioleaching was with S0 as the substrate. The efficiency of the bioleaching depended on H2SO4 generation from the added S0. The activities of the bacteria were not adversely affected by the dissolved metals. The maximum yields of chemical leaching were 68% Cu and 3.7% Zn.

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Research paper thumbnail of An ultraviolet spectrophotometric method for the determination of pyrite and ferrous ion oxidation by Thiobacillus ferrooxidans

Applied Microbiology and Biotechnology, Jul 1, 1986

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Solid phase changes in chemically and biologically leached copper smelter slag

Minerals Engineering, May 1, 2017

Abstract Pyrometallurgical processes for sulfide concentrates produce slag waste materials that c... more Abstract Pyrometallurgical processes for sulfide concentrates produce slag waste materials that contain multiple metals as carry-over impurities. Varied quantities of the metal content can be solubilized from the slag through chemical acid leaching or bioleaching. In this study, copper smelter slags were leached with and without iron- and sulfur-oxidizing bacteria in acid, sulfate-rich solutions and solid phase changes were determined. The samples (10% pulp density) were leached at 28 °C in stirred tanks at pH 2.5 and 3.0. The duration of the experiment was 37 d and the adjusted pH decreased to 2.3 in both sets of experiments. The primary metals of interest in the slag were Cu and Zn, with minor amounts of Ni and Co, and As, Sb, and Pb at trace levels. The metals in the slag were distributed in fayalite, glassy silicates and magnetite phases as well as minor amounts in oxides, metallic Cu and sulfides. Based on the solution analyses, the dissolution yields were 44% and 34% for Cu, 14% and 13% for Zn and Co, and 4.5% and 4.0% for Ni at initial pH values of 2.5 and 3.0, respectively. Fayalite was the most reactive mineral and Cu-sulfides were particularly refractory. The elemental composition of leached residues was matched with solid phase changes and the distribution of metals in the mineral phases.

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Research paper thumbnail of Growth of <i>Chlorella vulgaris</i> and associated bacteria in photobioreactors

Microbial biotechnology, Sep 21, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Oxidative dissolution of research-grade minerals by Thiobacillus ferrooxidans and Thiobacillus thiooxidans

Revista De Microbiologia, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Weathering of mica and feldspar in a black schist ore sample during bacterial leaching of iron sulfides

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Molecular biological enhancement of coal desulfurization. Eleventh quarterly technical progress report

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Iron Speciation in Acid Mine Effluents: Chemical and Microbial Controls : Final Report

Ohio State University. Water Resources Center eBooks, 1983

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Inhibition of ferrous ion oxidation in Thiobacillus ferrooxidans in the presence of oxyanions of sulfur and phosphorus

Coal science and technology, 1986

Ferrus iron oxidation by growing cultures of Thiobacillus ferrooxidans was sensitive to negative ... more Ferrus iron oxidation by growing cultures of Thiobacillus ferrooxidans was sensitive to negative catalysis (inhibition) by selected oxyanios of sulfur. The relative order of negative catalytic activity for the sulfoxyanions was S_20_5^(2-) > S_20_3^(2-) > S_20_4^(2-) > S_40_6^(2-). Inhibition by the sulfoxyanions was greater at μm 1.5 than at pH 2.0. A mechanism involving the formation of radical intermediates, HO_2,-OH, HSO_3, HSO_5, H_2O_4, and HS_3O_3, induced by Fe(II) and Fe(III) complexes is proposed to account for the observed inhibitory effects. Orthophosphate, pyrophosphate, and tripolyphosphate compounds were also inhibitory to ferrous iron oxidation by T. ferrooxidans. Orthophosphates were increasingly at high concentrations (200-300 mM) whereas the apparent toxicity of pyrophosphate and tripolyphosphate was inversely related to concentration over the range of 50-300 mM with no apparent at pH dependency at pH ≤ 2. Equilibrium models are presented to explain the relative effect of the phosphates in terms of phosphate precipitates, which were actually observed , and soluble complexes, which have an effect on the thermodynamics of electron transfer.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Analytical note: catalytic effects of sulfur and other compounds in the azide-iodine test

Journal American Water Works Association, Feb 1, 1981

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Research paper thumbnail of Biogenic hydrogen and methane production from Chlorella vulgaris and Dunaliella tertiolecta biomass

Biotechnology for Biofuels, 2011

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Research paper thumbnail of The Role of Microbial Activity in Suppression of Damping-Off Caused by<i>Pythium ultimum</i>

Phytopathology, 1988

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