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Which of the following statements regarding biochemical-based power plants is/are true? A) Methane is emitted along with carbon dioxide in aerobic digestion. B) Sewage gas represents a mix of carbon dioxide, methane and trace gas. C) Syngas is generated as a result of gasification in such a plant.
Only A and C
Only B and C
Only A and B
Only B
Only B and C
Biochemical-based power plants utilize the anaerobic digestion of organic matter to produce biogas, which typically consists of methane (CH4тАЛ) and carbon dioxide (CO2тАЛ). Aerobic digestion, conversely, involves oxygen and results in the production of water and carbon dioxide, rather than flammable methane.
IS 10561:1983 (Code of practice for biogas installations)
Biochemical-based power plants utilize the anaerobic digestion of organic matter to produce biogas, which typically consists of methane (CH4тАЛ) and carbon dioxide (CO2тАЛ). Aerobic digestion, conversely, involves oxygen and results in the production of water and carbon dioxide, rather than flammable methane.
C6тАЛH12тАЛO6тАЛтЖТ3CH4тАЛ+3CO2тАЛ тАФ simplified stoichiometric representation of anaerobic digestion
╬ФH=Energy┬аContent┬аof┬аSyngas тАФ representation of energy yield in gasification
Anaerobic digestion proceeds in four stages: hydrolysis, acidogenesis, acetogenesis, and methanogenesis. Methanogenic bacteria function only in the absence of oxygen, breaking down intermediate acids into methane and carbon dioxide. Gasification is a distinct thermochemical process that converts biomass into syngas (CO+H2тАЛ) at high temperatures.
Methane is the primary product of anaerobic (not aerobic) digestion.
Sewage gas is a mixture of methane (50тАУ75%), carbon dioxide (25тАУ50%), and traces of H2тАЛS and H2тАЛ.
Gasification involves thermochemical decomposition of biomass in an oxygen-deficient atmosphere.
Aerobic decomposition results in carbon dioxide, water, and heat generation, not biogas fuel.
Effective waste management and pollution reduction
Production of carbon-neutral fuel
Generation of nutrient-rich digestate as fertilizer
High initial capital investment
Sensitive to variations in feedstock composition
Risk of H2тАЛS corrosion in engine components
Rural electrification through biogas generators
Industrial process heat generation
Sewage treatment plant energy recovery
Aerobic processes are primarily used for composting or wastewater treatment oxidation ponds.
Option A is false because methane production is strictly anaerobic.
Gasification occurs at high temperatures (typically 700┬░C to 1200┬░C).
B is correct тАФ Sewage gas is a mixture of methane, carbon dioxide, and trace gases, and syngas is a product of biomass gasification.
Always distinguish between biochemical processes (anaerobic digestion) and thermochemical processes (gasification/pyrolysis) to avoid confusion in energy system questions.
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