The main component present in the biogas is hydrogen sulphide. Hydrogen sulphide is regarded as a toxic and corrosive substance. Hydrogen sulphide is responsible for damaging pipes and instruments. The combination of different elements found in biogas has an effect on its final use. Boilers can hold up the amount of hydrogen sulphide till 1000 ppm only and at less pressure. If the amount of hydrogen sulphide is not as much of as 1000ppm then only internal combustion engines work properly. You can found hydrogen sulphide in biogas always. But the concentration differs from the feedstock. Hydrogen sulphide removel from biogas by the following methods. These methods are
Iron sponge, using activated carbon, water scrubbing, etc. while choosing for the appropriate method is it better to take into account the cost involved in buying the chemicals used in the process. Also take care of things like adsorption capacity, labor needs, vacuum trucks utilized to empty the filters, etc.
Go through some methods utilized to remove hydrogen sulphide from biogas?
Natural desulphurization of biogas can be carried out by utilizing microorganisms. The hydrogen sulphide oxidizing microorganisms have a place with the group of Thiobacillus. For the microbiological oxidation of hydrogen sulphide scavengers, it is basic to add stoichiometric measures of oxygen to the biogas. Contingent upon the centralization of hydrogen sulphide this relates to 2 to 6 % air in biogas.
The easiest method for desulphurization is the adding of oxygen or air straightforwardly into the digester or in a capacity tank serving simultaneously as the gasholder. Thiobacillus is omnipresent and hence this system doesn’t need any insulation. They develop on the outside of the digester, which gives the important small scale aerophilic surface and simultaneously the vital supplements. They also develop yellow groups of sulphur. Contingent upon the temperature, the response time, the sum and spot of the air included the hydrogen sulphide amount could be diminished by 95 % to less than 50 ppm.
It is very important to take care of safety tips to abstain from overdosing of air if there is any pump failure. In steel digesters, without rust assurance, there is a little danger of erosion at the gas/fluid interface.
Iron Chloride Dosing
Iron chloride could be easily fed straightforwardly to the digester slurry or to the feed substrate in a storage tank. Iron chloride at that point responds with the hydrogen sulphide manufactured and develops iron sulphide salt. This strategy is amazingly viable in lessening high hydrogen sulphide levels yet less compelling in achieving a low and stable degree of hydrogen sulphide in the scope of vehicle fuel demands.
Right now this technique with iron chloride dosing to digester slurry must be viewed as a partial removal method so as to maintain a strategic distance from corrosion in the remaining of the upgrading procedure tool. The strategy should be increase with a last removal down to around 10 ppm.
The cost for such removal procedure is restricted since the main investment required is a storage tank for iron chloride arrangement and a dosing pump.
Chemical Products Industries, Inc. Address: 7649 SW 34th St, Oklahoma City, OK Phone: (800) 624-4356