Anaerobic Sludge Digester
Anaerobic digestion is processes by which microorganisms break down biodegradable material in the absence of oxygen.The process is used for industrial or domestic purposes to manage waste andr to produce fuels. The digestion process begins with bacterial hydrolysis of the input materials. Insoluble organic polymers, such as carbohydrates, are broken down to soluble derivatives that become available for other bacteria.
Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. These bacteria convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide. Finally, methanogens convert these products to methane and carbon dioxide.
The methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments. It is used as part of the process to treat biodegradable waste and sewage sludge. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere.
Biomass fermentation produces a gas mixture of methane and carbon dioxide, as well as small amounts of hydrogen, hydrogen sulphide and, in some cases, ammonia. The higher the rate of methane, the higher the energy content of the gas. In the process of upgrading biogas to biomethane with natural gas quality, the crude gas is first cleaned and compressed.
For Purification of Biogas is done thorough separation of CO2 and water vapour by means of a highly selective membrane technology, H2s and Amonia Removal leads to use biogas in internal combustion engines.
Biogas Purification by Pressure swing adsorption (PSA) is a technology used to separate some gas species from a mixture of gases under pressure according to the species’ molecular characteristics and affinity for an adsorbent material. It operates at near-ambient temperatures and differs significantly from cryogenic distillation techniques of gas separation. Specific adsorptive materials (e.g., zeolites, activated carbon, molecular sieves, etc.) are used as a trap, preferentially adsorbing the target gas species at high pressure. The process then swings to low pressure to desorb the adsorbed material.