Microbial Bioremediation | Boundless Microbiology

It is performed by iron and sulfide oxidizing bacteria or acid producing fungus. Bacteria recycle the major leaching reagent, like ferric iron, and perform further oxidation steps while gaining energy from the electron transfer. Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.

Leaching of Pyrite by Acidophilic Heterotrophic Iron ...

Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite (FeS2) when they were grown in pure cultures and in mixed cultures with sulfur-oxidizing Thiobacillus spp. Only one of the isolates (strain T-24) oxidized pyrite when it was grown in pyrite-basal salts medium.

Bioleaching - Wikipedia

Bioleaching is the extraction of metals from their ores through the use of living organisms.This is much cleaner than the traditional heap leaching using cyanide. Bioleaching is one of several applications within biohydrometallurgy and several methods are used to recover copper, zinc, lead, arsenic, antimony, nickel, molybdenum, gold, silver, and cobalt

8 Microbial Leaching of Metals - Wiley-VCH

192 8 Microbial Leaching of Metals 1 Introduction Future sustainable development requires measures to reduce the dependence on non-renewable raw materials and the demand for primary resources. New resources for metals must be developed with the aid of novel tech-nologies. in addition, improvement of alredy existing mining techniques can result ...

Application of heterotrophic microorganisms in metals ...

Application of heterotrophic microorganisms in metals removal by bioleaching Article in Chinese Journal of Ecology 26(11):1835-1841 · November 2007 with 87 Reads Cite this publication

Ore Leaching by Bacteria | Annual Review of Microbiology

Iron-Oxidizing Bacteria: An Environmental and Genomic Perspective David Emerson, Emily J. Fleming, and Joyce M. McBeth Annual Review of Microbiology Heavy Metal Mining Using Microbes Douglas E. Rawlings Annual Review of Microbiology Chlamydiae J Schachter, and and H D Caldwell Annual Review of Microbiology Microorganisms in Reclamation of Metals

Heterotrophic Acidophiles and Their Roles in the ...

Abstract. The most familiar and well-studied microorganisms indigenous to acidic mineral leaching environments are autotrophic sulfur- and iron-oxidizing bacteria such as Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans.Some photoautotrophs, such as the thermophilic rhodophyte Cyanidium caldarium, may also be present in extremely acidic environments that ...

EFFECTS OF VARIATIONS IN THE OPERATING CONDITIONS OF …

effects of variations in the operating conditions of some process parameters on the bacterial leaching of a nigerian iron ore sample

Bioleaching: metal solubilization by microorganisms | FEMS ...

Jul 01, 1997· To keep enough iron in solution the chemical oxidation of metal sulfides must occur in an acid environment below pH 5.0. The ferrous iron arising in this reaction can be reoxidized to ferric iron by T. ferrooxidans or L. ferrooxidans and as such can take part in the oxidation process again. In indirect leaching the bacteria do not need to be in contact with the mineral surface.

Phylogeny of Bacteria from Steelmaking Wastes and Their ...

though heterotrophic bacteria can also contribute to metal leaching [7]. The process of production of steel involves many stages, from reduction of iron ore at temperatures reaching 2400˚C (in a blast furnace) to metal plating, which uses a large amount of Zn to protect the steel from corrosion.

Bacterial leaching of ores and other materials

Bacterial leaching of heavy metals from sulfidic ore minerals. The interrelationship between Thiobacilli and accompanying heterotrophic bacteria. Almost all of the isolated strains of Thiobacillus ferrooxidans, but none of the T. thiooxidans strains,are able to utilize molecular nitrogen as a nitrogen source.

Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria ...

Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria: A Review Satarupa Roy and Madhumita Roy* ... acidification as well as solubilization of heavy metals. Metals from poor-quality ore and mineral compounds are removed ... report of the benefit of the metal leaching of heterotrophic

Bioleaching: metal solubilization by microorganisms ...

Jan 17, 2006· Bioleaching is a simple and effective technology for metal extraction from low‐grade ores and mineral concentrates. Metal recovery from sulfide minerals is based on the activity of chemolithotrophic bacteria, mainly Thiobacillus ferrooxidans and T. thiooxidans, which convert insoluble metal sulfides into soluble metal sulfates.Non‐sulfide ores and minerals can be treated by heterotrophic ...

Minerals | Free Full-Text | Bioleaching of Arsenic-Bearing ...

World copper (Cu) production has been strongly affected by arsenic (As) content, because As-rich Cu concentrates are not desirable in the metal foundries. When As-rich Cu concentrates are processed by smelting they release As as volatile compounds into the atmosphere and inside furnaces, generating serious risks to human health. In recent years, exports of Cu concentrates are being penalized ...

Recent advances in microbial leaching of ores | SpringerLink

Processes involving biological solubilization of metal values from ores, or removal of mineral constituents that interfere with metal value recovery from ores by abiological means, published mostly in the last 10 years, are reviewed. Many of them, though promising, have …

Bioleaching of Heavy Metals by Sulfur Oxidizing Bacteria ...

These bacteria Bioleaching is the process of dissolving (leaching) sulfide oxidize decreased sulfur compounds including sulfides, minerals and extracting metals easily by the increasing effect of elemental sulfur and thiosulfate to sulfate8. the production of less toxic metals by unmediated discharging bacteria.

Advances in microbial leaching processes for nickel ...

Advances in microbial leaching processes for nickel extraction from lateritic minerals - A review3 Korean J. Chem. Eng. the heterotrophic fungi, have a pivotal role in metal bioleaching from oxidic minerals. Some authors suggested for citric acid pro-duced by microbes are the most effective leaching …

Analysis of Microbial Community in Heap Bioleaching of Low ...

High-throughput sequencing technology also known as "next generation" sequencing technology, compared with the traditional sequencing method has the characteristics of fast speed, high flux, low cost. In recent years the technology in the detection of microbial diversity has been fully applied. In this study, the microbial community of ore heap in different area and different depth was studied ...

Bioleaching - an overview | ScienceDirect Topics

Metals are found often as alloys in which they are in their nonvalent elemental form in WEEE. The process requires an additional energy source for the bacteria, i.e., iron and sulfur for the autotrophs, and additional carbon source and electron donor for the heterotrophic bacteria.

A study of the bioleaching of a Spanish uranium ore. Part ...

A study of the bioleaching of a Spanish uranium ore. Part I: A review of the bacterial leaching in the treatment of uranium ores ... rapid in the presence of thiobacilli than of ferric iron alone. Recent calorimetric and respirometric research [20] supports this hypothesis, although the rate of ... the heterotrophic bacteria can adapt to media ...

Bioleaching - an overview | ScienceDirect Topics

Apatite was the main phosphorus mineral in the iron ore and the wastewater contained native sulfur-oxidizing bacteria. The sulfur-oxidizing bacteria are not as sensitive to organic matter as the iron-oxidizing bacteria and either used the organic matter as a …

Microbial Leaching of Uranium Ore - InTech - Open

Microbial Leaching of Uranium Ore Hadi Hamidian Islamic Azad University, Qaemshahr Branch Iran 1. Introduction This chapter is a review of the microbiological leaching of uranium ores. Microbiological leaching has been use as an alternative approach to conventional hydrometallurgical methods of uranium's extraction.

CN103396964A - Compound bacterium community capable of ...

The invention discloses a compound bacterium community capable of efficiently leaching a sulphide ore, and a compounding method and an application method thereof, and belongs to the technical filed of wet-process metallurgy. Aiming at a biological leaching mechanism of the sulphide ore and the physiological-biochemical characteristics of microorganisms, a community capable of efficiently ...

Genetically engineered acidophilic heterotrophic bacteria ...

A bacteriophage capable of infecting acidophilic heterotrophic bacteria and processes for genetically engineering acidophilic bacteria for biomining or sulfur removal from coal are disclosed. The bacteriophage is capable of growth in cells existing at pH at or below 3.0. Lytic forms of the phage ...

Leaching of Pyrite by Acidophilic Heterotrophic Iron ...

Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite (FeS 2) when they were grown in pure cultures and in mixed cultures with sulfur-oxidizing Thiobacillus spp. Only one of the isolates (strain T-24) oxidized pyrite when it was grown in pyrite-basal salts medium.

Biohydrometallurgy for Nonsulfidic Minerals A Review

to now deals with the use of chemolithoautotrophic bacteria for leaching of sulfidic minerals and ores. Leaching mechanisms of ... Among the heterotrophic bacteria, members of the genus Bacillus and Pseudomonas have been found effective in the leaching of nonsulfidic minerals (Karavaiko et al. 1988). ... reduction of iron ore with Pseudomonas ...

Ore Leaching by Bacteria, Annual Review of Microbiology ...

Ore Leaching by Bacteria Ore Leaching by Bacteria Lundgren, D G; Silver, M 1980-10-01 00:00:00 The elements iron and sulfur circulate in the biosphere through specific paths from environment to organisms and back to the environment. Certain paths only involve microorganisms and it is here that biological reactions of relevance in leaching of metals from mineral ores occur (28).

A New Heterotrophic Strain for Bioleaching of Low Grade ...

A new heterotrophic strain, named Providencia sp. JAT-1, was isolated and used in bioleaching of low-grade complex copper ore. The strain uses sodium citrate as a carbon source and urea as a nitrogen source to produce ammonia. The optimal growth condition of the strain is 30 °C, initial pH 8, sodium citrate 10 g/L and urea 20 g/L, under which the cell density and ammonia concentration in the ...

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