field application of metal microbe interaction
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FIELD APPLICATION OF METAL-MICROBE INTERACTIONPresented By AHMED MADNIRegistration No. SP14-BTY-011
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CONTENTS Introduction Bioleaching Types of Bioleaching Species used in Bioleaching Mineralization Famous company currently working Research Future prospects
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INTRODUCTION
Bioleaching and Bioremediation of polluted sites
Mineralization of polluting organic
compounds
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BIOLEACHING
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CONTINUE… Bioleaching works by using specific bacteria
that can essentially “eat” the metal content out of ore.
It is carried when there are lower concentrations of metal in ore and they need an efficient, environmentally responsible method.
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TYPES OF BIOLEACHINGBased on mechanism
Direct Bioleaching (Enzymes involved)
Indirect Bioleaching (Chelating substances)
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BACTERIA USED IN BIOLEACHINGSpecies used is Thiobacillus Ferrooxidants Acidophilic chemolithoautotrophs that utilize
inorganic compound as energy source. Organic acid and chelating molecules are
produced
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oxidizing of pyrite (FeS2)
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Urinate ore to uranium
Oxidizes insoluble to
soluble
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CONTINUE… Microbe reducible metal Produces Ferric iron and that forms complex structure and make it soluble form at neutral pH Can be used as terminal electron acceptor in in
situ anaerobic bioremediation of polluted site
Extraction of metals such as Co, Mo, Ni, Pb and Zn from sulfide ores by bioleaching is technically feasible
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CONTINUE… Bioremediation of polluted site with
Chromate or dichromate (CrIV) is possible by stimulating the reduction of CrIV to CrIII by bacteria
Fungi can convert oxidized selenium to volatile-methylated selenides (vapour form) process named as volatilization
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MINERALIZATION
Examples of inorganic substances include all metals, ammonia, hydrogen sulfide, chlorine, salt, minerals such as gypsum and generally all compounds that do not contain carbon-hydrogen bonds.
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FAMOUS COMPANY CURRENTLY WORKING
Gencor in South Africa BioNIC process - Nickle extraction From low grade sulfide ore
Western Australia - Project in Uganda Cobalt from Pyrite ore
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RESEARCH Penicillium funiculosum works to extract 50%Ni 75%Zn from test solution containg 100mg/litre of metal at 6.6pH and 6.5pH respectively
Algal biosorbant of Chlorella vulgaris and Bacillus biomass used for treat waste water and metal recovery
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FUTURE PROSPECTSPositive points Effective Ecofriendly Economical
Good and effective metal biosorbents can replace commercial ion exchange resins
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BIOSORBANTS Certain natural materials of biological origin The biosorbent, unlike mono functional ion
exchange resins, contains variety of functional sites including carboxyl, imidazole, sulphydryl, amino, phosphate, sulfate, thioether, phenol, carbonyl, amide and hydroxyl moieties.
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CONTINUE…
Interdisciplinary approach between biotechnology and metallurgy will bring lab scale bioremediation to land scale technology
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Thank you
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