Biogas is produced when the solid biomass is digested and decomposed anaerobically. The biogas thus produced is rich in methane and can be a source of energy that can be used in the kitchens and other circumstances. Biogas production also reduces the biowaste and puts it to good use.

However, biogas may also contain certain other gasses apart from methane. These may include carbon dioxide, hydrogen, and hydrogen sulfide, along with certain impurities. All the other gasses except for hydrogen and methane are toxic, useless, or harmful to the environment. They do not produce any energy. Hydrogen sulfide is one such gas that does not provide any benefits but has many drawbacks. In such a scenario, hydrogen sulfide removal from biogas becomes an important step in the process of production of biogas and its conversion into a potent and sustainable fuel source.

The Importance of Removing Hydrogen Sulfide from Biogas

Biogas is used today for a variety of purposes, the most common being its use in the kitchen for cooking. It can be a suitable replacement for kerosene, LPG, firewood, charcoal, and other kinds of fuel sources. It can be used in the internal combustion engines as well for driving equipment, and for producing electricity. Methane can warm the climate and therefore its use as an energy source is also good for the environment. Household wastes, animal wastes, sewage sludge, crop residues, landfill, as well as wastewater can all be a source of biomass and biogas production. Biogas is a cheap and renewable source of energy that conserves the use of fossil fuels and resources including coal, oil, and natural gas. However, biogas cannot achieve its fullest potential when it has impurities like hydrogen sulfide. Some of the reasons why it is important to remove hydrogen sulfide from biogas are given below.

• Hydrogen Sulfide can cause corrosion in the engines where biogas is used as a fuel source.

• Hydrogen sulfide also has a bad effect on engine oil. The oil should be changed more often if the emission of hydrogen sulfide is not controlled.

• Hydrogen sulfide formation may also result in the emission of Sulfur Dioxide or Sulfur Trioxide from the engine exhaust. Sulfur dioxide is a toxic gas that causes eye/skin/throat irritation and other adverse health conditions in humans.

When you want to produce quality methane gas for grid supply and other purposes, you need to ensure that the toxic and undesired elements contained in it are removed. The presence of high amounts of hydrogen sulfide renders the biogas unusable. Apart from spoiling the engines, it may also have bad effects on the environment and humans.

Choosing Hydrogen Sulfide Removal Services

Fortunately, there are leading end-to-end service providers for removing hydrogen sulfide from biogas. These leading organizations help the industries produce quality biogas that is fit for usage in all circumstances. They can equip your biogas production process with hydrogen sulfide adsorbent filters and other auxiliary equipment to ensure that adverse gasses like hydrogen sulfide are effectively removed from the biogas.


The hydrogen sulfide removal services are a one-stop destination for all your biogas production needs. These companies can offer you the best and newest technologies in the segment and also offer additional services for producing quality biogas at a low cost.

Contact Us:

Chemical Products Industries, Inc.

Address: 7649 SW 34th St, Oklahoma City, OK
Phone: (800) 624-4356

H2S is the major toxin in biogas which is both hazardous as well as poisonous and causes substantial damage to various devices, piping, in addition to instrumentation. The concentration of different elements of biogas affects its ultimate end-use. The internal combustion engines function most effectively when H2S is maintained less than 100 ppm while boilers are able to endure concentrations of H2S as much as 1000 ppm plus comparatively low pressures. The commonly used techniques for the H2S removal from biogas happen to be internal to the anaerobic digestion procedure – iron chloride dosage to digester slurry as well as air/oxygen dosage to digester biogas.

Biological Desulphurization

It is feasible to carry out biological desulphurization of biogas by making use of microorganisms. The majority of the sulphide oxidizing microorganisms belongs to the Thiobacillus family. It is vital to include stoichiometric volumes of oxygen to the biogas for the microbiological oxidation of sulphide. It corresponds to 2% to 6 % air in biogas based on the concentration of hydrogen sulphide.

The most straightforward technique of desulphurization is the inclusion of oxygen or air directly into the digester or within a storage tank functioning concurrently as the gasholder. Devices do not need transmission since Thiobacilli happen to be all-pervasive. They develop on the surface of the digestate providing the required nutrients and the required microaerophilic surface simultaneously. Yellow clusters of sulphur are created in this way. It is possible to minimize the hydrogen sulphide concentration by 95% to less than 50 ppm which is determined by the reaction time, the temperature, the amount as well as place of the air added.

In the event of pump failures procedures of safety need to be taken to stay away from the overdosing of air. As per the content of methane, biogas in air happens to be explosive in the range of 6% to 12%. There is a minor chance of corrosion at the gas/liquid interface in steel digesters devoid of rust protection.

Iron Chloride Dosing

It is possible to provide iron chloride straightaway to the feed substrate or to the digester slurry within a pre-storage tank. Following this, iron sulphide salt is created by the action of Iron chloride on hydrogen sulphide gas removal. In spite of being less efficient in hitting a low and steady level of hydrogen sulphide within the range of vehicle fuel requirements, this particular technique is highly successful in lowering high concentrations of hydrogen sulphide.

In this context, the procedure with iron chloride dosing to digester slurry can only be considered as a partial removal method so as to stay away from corrosion in the remaining portion of the upgrading procedure equipment. It is imperative to accompany this technique with a final elimination down to around 10 ppm.

For this kind of removal procedure, the investment charges are restricted given that the only investment necessary happens to be a dosing pump in addition to a storage tank for the iron chloride solution. On the flip side, due to the high price of iron chloride the functional cost is going to be high.

Contact US:

Chemical Products Industries, Inc.
Address: 7649 SW 34th St, Oklahoma City, OK
Phone: (800) 624-4356