Gas De Sulphurisation

DMT a Dutch based manufacture of odour control and Biogas desulphurisation systems are now offering the Sulfurex® process in the UK with Heat & Power Services as their UK agent. The system is designed to reduce the level of incoming Biogas from 20,000ppm down to 135ppm prior to it being fed into the CHP plant.





The DMT Sulfurex® Desulphurisation Process has the following benefits:-
• simple, compact and robust construction;
• low capital cost;
• very flexible operating parameters;
• simple low cost operation and maintenance;
• low consumable usage;
• no chemical waste;
• economically viable for sulphur loads up to 10 – 25 tons a day depending on local site conditions
• equipment assembled as transportable units
• Modular construction in optional insulated housings.


The Sulfurex® process is a multiple stage scrubbing process based on the selective absorption of H2S in a solution of sodium hydroxide. Numerous Sulfurex® systems are operational throughout Europe.  Despite the success of the system it has been significantly improved in recent years.

Pre-treatment of Biogas using activated sludge can significantly reduce the consumption of sodium hydroxide and thereby lower operational costs. Selective absorption reduces the amount of CO2 absorbed and consequently reduces the volume of sodium hydroxide required. The second stage scrubbing process of the Sulfurex® system in which the spent lye can be used to further improve the rate of absorption.

The Sulfurex® system is capable of reducing the H2S levels, up to 20,000ppm in the incoming Biogas stream by more than 99%.

Further developments also include the potential for desulphurisation without using any chemicals at all, this system is known as the Biosulfurex ® process and utilises a purely biological approach. When a limited amount of Oxygen is dosed into the Biogas flow “Thiothrix & Thiobacillus” bacteria oxidise H2S to elemental sulphur and sulphate, dependant on process conditions, or sulphuric acid. In order for the bacteria to oxidise effectively Oxygen, nutrients, and a contact surface are required. Oxygen is provided by a compressed air supply, nutrients from activated sludge and the contact surface from the media within the scrubber itself.

For additional information please contact via the contact us page or alternatively please follow this link to our colleagues website