Working Principle of Biogas Desulfurization Knowledge
Biogas is a flammable gas produced by anaerobic digestion of organic matter. Its characteristics are similar to natural gas. It is a good clean fuel and a renewable energy source. However, the hydrogen sulfide (H2S) contained in biogas is highly corrosive, which can damage downstream equipment in the process of utilization, and emit sulfur oxides when burning, which pollutes the environment, thus greatly restricting our use of biogas. It can provide a complete BIOREM biotrickling filter system to treat biogas with different hydrogen sulfide content. Our system is safe and efficient, and can achieve the recovery of useful by-products (sulfur) to ensure maximum customer benefits.
In the past, biogas desulfurization used chemical or catalytic methods, but these methods need a lot of chemical agents and high energy consumption in the operation process, and will produce new sulfur compounds, if not well disposed of, it will cause secondary environmental pollution. Biological desulfurization technology is more economical and effective than chemical or catalytic methods, which are expensive to operate.
Why do we need to desulfurize biogas?
During anaerobic digestion, sulfur compounds are converted to H2S. Generally speaking, the content of H2S in biogas is between 0.1% and 0.2%. H2S is highly corrosive, which not only causes corrosion of pipelines, valves and flowmeters, but also causes great damage to internal combustion engines. H2S forms sulfuric acid after combustion, which reduces the PH value of engine oil and causes equipment corrosion. It also increases the replacement frequency of engine oil, shortens the service life of equipment, and increases the cost of equipment maintenance, replacement and maintenance. At the same time, the combustion of H2S will also pollute the atmospheric environment. The desulfurization system uses safe biological methods to remove H2S from biogas, which not only guarantees the longer and more efficient operation of your equipment, but also improves the efficiency and saves you time and money.
Working Principle of the System
Biogas desulfurization system is an aerobic biological trickling filtration system, which adopts pressure air supply and upflow structure. Biogas enters the trickling filter from the bottom of the system and passes through the filter material from bottom to top. The specially developed filter material not only provides an ideal environment for the growth of acidophilic bacterial biofilm, but also provides enough space for the free passage of gas. The filter media and biofilm are maintained by the circulating water system. When biogas enters the system and contacts with biofilm, hydrogen sulfide dissolves first and then is oxidized and decomposed by microorganisms. The sulfur and sulfate compounds formed are discharged from the circulating water as by-products of the system.
A small amount of gas is injected into the system to maintain the oxygen content of the gas in order to meet the requirement of optimum biological activity. The design of the system will control the oxygen content in the treated gas, and a variety of joint safety interlocking devices will be used to ensure that the oxygen content is always below the minimum explosion limit.
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