Biogas Background Basic Terminology Stages of the Biogas Process Industrial Process Purification of CH4 1
Biogas Biogas typically refers to a mixture of different gases Produced by Organic Matter In the absence of oxygen
3 Background In the UK, for example, can replace around 17 % of vehicle fuel Biogas can be cleaned and upgraded to natural gas standards when it becomes bio- methane Biogas is considered to be a renewable resource because of repeating cycle
4 Basic Terminology Ex : Methanosarcina Activated sludge Aerobic Anaerobic Digestion
Hydrolysis Acidogenesis Acetogensis Methanogensis 5 Basic Terminology Carbohydrates + H 2 O Sugars Fatty acids Carbonic acid + alcohols Carbonic acid CH 3 -CO-OH + CO 2 + H 2 CH 3 -CO-OH CH 4 + CO 2 (while hydrogen is consumed) Note : The biosynthesis of the hydrocarbon methane; common in certain bacteria, known as bacterial methanogenesis
Stages of the Biogas Process 5 Four Stages of the Biogas Process
7 Stages of the Biogas Process An Overview of the methanogenesis process The microbial formation of methane Confined to anaerobic habitats The production Acetate is the major substrates Methanogenic microbes methanogens CO2 Forrmic acid Methanol Methylamines Acetate Methane
Stages of the Biogas Process Methanogens are the only living organisms Stage1 Hydrolysis Stage 2 Fermentation based on carbohydrates Stage 3 Synthesis of fatty acids Stage 4 Synthesis of methane Hydrolytic bacteria Acetogenic Bacteria Methanogenic bacteria 8
9 Industrial Process
10 Purification of CH 4 98% methane delivered Water vapor, CO 2, nitrogen and oxygen Acid and gas absorption, pressure, CO 2 and H 2 S CO 2 and H 2 S Water washing Pressure swing adsorption Selexol Amine gas treater
11 Conclusion