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Global Economics Crisis Essay

721 words - 3 pages

Global economic crisis due to the depletion of fossil fuels had turned backed the world towards alternate source of energy for industrial development. Non-renewable and clean energy had gained importance for a sustainable growth. Hydrogen is one between the lightest, easily combustible gas that can be used as eco-friendly source of energy. Hydrogen burns out to produce water as a by-product. Hydrogen has been produced by various methods which include chemical reaction, electrolysis, light fermentation and dark fermentation. Chemical method involves the production of gases at lab scale using Kipp’s apparatus that consists of three bulbs stacked .Acids reacts with the metals on the middle ...view middle of the document...

Homoacetogenic fermentation has also been an obstacle towards attaining the maximum hydrogen yield apart from the secondary metabolites. Homoacetogenic microbes converts hydrogen and carbon-di-oxide into acetate as an end product which inhibits the growth other hydrogen producing micro-organisms. Clostridium thermoaceticum and Clostridium thermoautotrophicum are strictly anaerobic, thermophilic micro-organisms capable of carrying out homoacetogenic fermentation with acetic acid tolerance [5].At an increased acetate levels of 50g/L the hydrogen production was lowered to 0.44 moles H2/mole of glucose [6]. Certain other anaerobic hydrogenotrophs, Methanothermobacter thermoautotrophicus,Clostridium thermolacticum and Morella thermoautotrophica are capable of reducing the hydrogen partial pressure and resulting in increased acetate production .Acetate tolerant level for Clostridium formicoaceticum below pH 6.8 was found to be 6 mmol/L [7]. And the highest acetate tolerant level where most of the homoacetogens can survive was reported to be less than 30g/L [8].These drawbacks had made fermentation to be complicated process towards effective hydrogen production. All these cons had made to isolate particular microbial population from mixed anaerobic consortia capable of higher hydrogen production per mole of...

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