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Products of Anaerobic Digestion

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  Anaerobic digestion - in this process, bacteria breaks down organic matter such as animal manure, wastewater biosolids, and food wastes while in the absence of oxygen. - in the reactors, complex microbial communities which digest the waste can be found: The products of this reaction include Biogas and digestate (the solid and liquid material end-products of the AD process) which is discharged from the digester. As previously discussed, the biogas itself is composed of a mixture of different gases which include: methane (CH4) - relatively high percentage (50 to 75 percent) carbon dioxide (CO2) hydrogen sulfide (H2S) water vapor  trace amounts of other gases. Digestate - this is the residual material remained after the digestion process is completed. - It is composed of liquid and solid portions which are normally dealt with separately since each have value that can be realized with varying degrees of post processing. USES: With appropriate treatment, both the solid and liquid...

Biogas Storage

  Storage of Biogas Biogas is not usually produced at the time and quantity necessary in meeting the requirements of the conversion system load which it serves resulting in the implementation of storage systems in order to smooth out variations in gas production, gas quality and gas consumption.  The storage component acts as a reservoir: this allows downstream equipment to operate at a constant pressure. A wide variety of materials have been used in making biogas storage vessels: - Medium-and high-pressure storage vessels are constructed of mild steel  - low-pressure storage vessels constructed of steel, concrete and plastics.  - The newest reinforced plastics feature polyester fabric suitable for flexible digester covers.  With this in mind, advantages and disadvantages of the materials for both types of vessels must be considered during designing. The delivery pressure required for the final biogas conversion system affects the choice for biogas storage. http...

Aspects to Consider during Implementation of Biogas

  Health Aspects/Acceptance Factsheet Block Body For direct use, the following applying conditions should be kept: In some cases, especially at larger scale, further treatment of biogas is required to remove traces of water, carbon dioxide or hydrogen sulphide, before it is ready for use Safety measures are needed in order to reduce the risk of explosion in case of leakages from the storage. Operation & Maintenance Condensation is likely to occur since Biogas is normally fully saturated with water vapour :  Factsheet Block Body - It is recommended that water traps be installed so that water can be easily removed when accumulated. - this would aid in preventing blockage of pipelines and also corrosion - The gas pipelines, fittings and appliances must be regularly monitored by trained personnel. When using biogas for an engine, it is necessary to first reduce the hydrogen sulphide because it forms corrosive acids when combined with condensing water. The reduction of the carb...

PROS and CONS of BIOGAS

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  Advantages Free ,renewable source of energy Reduction of deforestation in the cases where firewood was previously utilized Little operation skills or maintenance required Contributing to reducing the emission of gases that contribute to global warming Deforestation and soil erosion can be reduced Disadvantages May not be able to fully meet the energy requirements it is unable to replace all types of energy Cannot be easily stored (low energy density per volume) and needs to be continuously used Gas production below 15°C is no longer economically feasible Diagram showing the process cycle for the creation of Biogas https://sswm.info/factsheet/direct-use-of-biogas  https://www.homebiogas.com/advantages-and-disadvantages-of-biogas/

Bio-gas and its Uses

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Biogas is a renewable source of energy which is produced through the process of Anaerobic digestion by the mixture of waste material and animal waste. It is a composition of gases which are mainly methane and carbon dioxide but can contain small amounts of other gases including  hydrogen sulphide, siloxanes and some moisture. The percentage of each gas contained in the biofuel varies since the composition depends on the type of waste used in the process.  Diagram showing the process map of the Bio-Gas System https://renewable-world.org/our-approach-to-renewable-energy/technologies/biogas-systems/  USES  In instances where the situation calls for natural gas, it can be used directly such as combustion. These include : absorption heating and cooling cooking space and water heating drying gas turbines Other uses include: fueling internal combustion engines fuel cells for production of mechanical work/ electricity https://biogas.ifas.ufl.edu/uses.asp