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LESNI The Air Purification People


LESNI design, build and supply turnkey solutions for the purification of industrial waste air, process gas emissions, air pollution control. LESNI extensive range of technologies and services offered, includes front end design studies, emission monitoring, preventive maintenance services, as well as manufacture and supply of air pollution control equipment & purification solutions for general waste exhaust and process air laden with inorganic gases or volatile organic compounds (VOC), and odour emissions. Proven technologies offered includes thermal and catalytic oxidizers, and regenerative thermal oxidizers. Solutions treating toxic inorganic gases, such as ammonia and hydrochloric acid, Hydrogen Cyanide (HCN), Ethylene Oxide (ETO) and ozone depleting gases including Freons (CFC) from frdige and freezers demanufacturing processes. Air pollution control packages includes; wet chemical gas scrubbers, adsorption on activated carbon and recovery of solvents, supply of activated carbon and zeolite filters and adsorbers in fixed and regenerating type systems, thermal and catalytic oxidisers, abatement of Ethylene Oxide from the sterilisation of medical devices, including supply of preconditioning and accelerated degassing cells and/or vacuum degassing chambers.


Mr. Sean Maamari



Effective and cost saving method of H2S removal from BIOGAS

The proven LESNI solution for purification of hydrogen sulphide (H2S) emission.

Lesni selected grades of activated carbon and adsorbers are used as adsorbent for various contaminants in air purification. It is regularly used in removing VOC's, organic and inorganic compounds and odours to reduce their concentration to levels within threshold limits and legislation. It is also used for recovery of some solvents.

These adsorbers are used for many different applications such as; production processes and manufacturing operations to control emissions, odour abatement in sewage treatment plants as well as in final treatment of biogas.

Biogas is produced by the digestion process of biological substrates, such as cattle and pig manure, corn silage and much other waste to energy recycling processes.

By burning biogas in a block heat and power plant you turn it into electrical power and thermal energy. Unfortunately some unwanted by-products are generated by the process, e.g. hydrogen sulphide (H2S).

Hydrogen sulphide reacts in the first step while burning to sulphur dioxide and water.
Secondly with pressure and heat it develops to sulfurous acid (H2SO3), which has a negative & corrosive effect on the equipment. Thus, almost complete desulfurization of biogas is necessary.

LESNI high effective and cost saving technology uses a standard filter in selected material filled with special impregnated activated carbon, to provide high adsorption capacity to remove sulphur element from biogas by chemical adsorption "chemisorption" and help prevent damage to the gas engine, while extending service interval and lifetime of filter media.
The LESNI activated carbon filter is suitable to remove H2S from a few ppm up to 1000's ppm with high purification efficiency.

For further information please contact;

For further information please email Lesni A/S Air Purification Engineering

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