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Design of a dry/solid-state anaerobic digestion (AD) biogas plant. High solids (dry) digesters are designed to process materials with a solids content between 25 and 40%. Unlike wet digesters that process pumpable slurries, high solids (dry – stackable substrate) digesters are designed to process solid substrates without the addition of water.
The higher concentration of methane in the biogas means that it is a higher grade fuel. [5] In addition to generating biogas, which may be used as a cooking or heating fuel, the Nisargruna plant also produces a weedless organic manure slurry. This slurry has a C:N (carbon to nitrogen) ratio of 12:1 to 16:1 and is a good organic soil conditioner ...
In 2010 there were 5,905 biogas plants operating throughout the country: Lower Saxony, Bavaria, and the eastern federal states are the main regions. [74] Most of these plants are employed as power plants. Usually the biogas plants are directly connected with a CHP which produces electric power by burning the bio methane.
Biological methanation takes place in a separate methanation plant. The gas is completely converted into methane before the infeed into the gas grid. The carbon dioxide, produced in a gas processing system, is converted into methane in a separate methanation plant, by adding hydrogen and can then be fed into the gas grid.
The above table shows the composition of raw biogas after primary treatment and biomethane. The fractions of crude biogas can vary greatly, depending on substrate, plant design, and other factors. The nature of the biomethane is adapted to the corresponding qualities of natural gas. Biogas is used mostly directly in a biogas cogeneration plant.
Anaerobic digesters can be categorized according to several criteria: by whether the biomass is fixed to a surface ("attached growth") or can mix freely with the reactor liquid ("suspended growth"); by the organic loading rate (the influent mass rate of chemical oxygen demand per unit volume); [2] by centralized plants and decentralized plants. [3]
Methanogenesis can also be beneficially exploited, to treat organic waste, to produce useful compounds, and the methane can be collected and used as biogas, a fuel. [21] It is the primary pathway whereby most organic matter disposed of via landfill is broken down. [ 22 ]
Biogas plant model diagram. A bio-energy village is a regionally oriented concept for the use of renewable energy sources in rural areas.The system uses biomass from local agriculture and forestry in a biogas powerplant to meet the complete energy requirements of a village, such as electricity and district heating.