Oxygen, hydrogen, nitrogen and other gases are different. Biogas is actually a mixed gas, and its main components include methane, carbon dioxide, hydrogen sulfide, water vapor, etc. The proportion of each component in biogas produced by different methods may vary, but the main component is methane, which is CH4. Therefore, biogas can be burned and can be used as a renewable energy source.
Among these components of biogas, hydrogen sulfide gas, also known as H2S, has a foul odor and is harmful to human health. It can dissolve in water to form hydrosulfuric acid, which can also cause corrosion to biogas equipment. Therefore, before using biogas or conducting combustion emissions, it is necessary to use relevant equipment to remove hydrogen sulfide as much as possible. This step of treatment is called biogas desulfurization.
There are currently three main desulfurization methods that can achieve industrial operation, namely dry desulfurization, wet desulfurization, and biological desulfurization:
1. Dry desulfurization is commonly used for the treatment of low sulfur biogas, especially suitable for small and medium-sized biogas projects, such as biogas tanks in breeding farms, landfill gas treatment in garbage landfills, and biogas treatment in aeration tanks in sewage treatment plants. Due to its simple equipment structure, easy maintenance, and almost no need for professional personnel to operate, it only requires regular regeneration and replacement of desulfurizers. At present, the desulfurizer for dry desulfurization on the market generally uses iron oxide particles because of their lower cost and simple regeneration operation. Other desulfurizers such as zinc oxide and activated carbon cannot be regenerated and can only be disposed of after desulfurization, which not only causes environmental problems but also increases desulfurization costs.
2. Wet desulfurization is the process of sending biogas into a specific solvent to remove H2S. Generally, limestone or lime slurry is used as a desulfurizer. The desulfurization rate of wet desulfurization is generally greater than 90%, and the processing capacity is large, making it suitable for large-scale biogas projects. However, the drawbacks of wet flue gas desulfurization are also quite obvious: high initial investment costs, high operating costs, large footprint, complex system operation requiring dedicated personnel to maintain, and difficult to treat by-products such as gypsum and wastewater.
3. Biological desulfurization, also known as biocatalytic desulfurization (BDS), is a new type of biogas desulfurization method that utilizes specific types of bacteria for biological treatment and desulfurization under normal temperature and pressure conditions. Biological desulfurization technology includes biological filtration, biological adsorption, and biological drip filtration. These three systems are open, and their microbial populations will change with changes in the environment. In the process of biological desulfurization, sulfur oxide pollutants should be bioreduced to generate sulfides or H2S, and sulfur elements should be removed after generating elemental sulfur through biological oxidation.
Through the application of automation technology, high efficiency and precision in metal sheet metal processing have been achieved.
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