Desulfurization of Biogas with MOLECULAR FILTRATION

Desulfurization of Biogas with CamPure 32

CamPure 32 is the new ideal Camfil molecular filtration media for the removal of hydrogen sulfide during the production of biogas in an anaerobic process. 

G.A.E.C de la pépinière

GAEC de la pepiniere, a "Groupement Agricole d'Exploitation en Commun" (GAEC: jointly run farms), was founded in 1987 in Saint Aubin de Bonneval (North West of France) by 4 partners. It now employs 1 person and manages 230 hectares of mixed crops (wheat, corn, etc ) and livestock farming (120 dairy cows and production of veal calves).
 

Methanisation Unit

The methanisation unit was commissioned 1n 2012 for an investment of 900,000 €. 
The unit is composed of a digester, a post-digester, a storage pit for the feedstock, and a pit containing the liquid digestate. Biomass feedstock is composed of solid and liquid manure for 70
% complemented by 30 % of plant (wheat, corn, and catch crop).

THE BIOGAS

The biogas is converted into heat and electricity (cogeneration)  by a 250 kW Scania Dual Fuel engine. The generated heat is used on the farm and the electricity is sold and fed into the local power grid. The methanisation unit produces around 150 m3;h of biogas, which is contaminated with significant amounts of hydrogen sulphide  (H2S).   To   protect   the   engine   from   corrosion,   it is
necessary to remove the H2S from the biogas. Engine corrosion leads to unscheduled maintenance, operational downtime, and loss of process efficiency.  

To remove the H2S, Camfil offers CamPure 32, a specific molecular filtration media with a high H2S adsorption capacity.

A MEDIA WITH A HIGH ABSORBENT POWER

Camfil offers the market a cost-effective media for the removal of hydrogen sulphide generated during the production of biogas by anaerobic digestion: CamPure 32. This high-quality chemical adsorbent is a combination of adsorbents, treated by a dedicated chemical impregnation system. This media has a lower dust content compared to classical carbon and also exhibits a longer lifetime. 
CamPure 32 is certified in accordance with  UL 900. The low flammability characteristics make it a much safer media than carbon. This is an important feature for use in an environment where ignition of adsorbent media beds is a real risk, e.g. biogas production.
 

Proven efficiency in real operating conditions

An evaluation of CamPure 32 in real operating conditions was carried out at GAEC de la pépinière on early 2019. 500 litres of activated carbon from the existing filter vessel were replaced by CamPure 32  without any modifications. 
The upstream H2S concentration, before filtration, usually fluctuates between 150 and 200 ppm. After filtration, the downstream H2S concentration should be lower than 10 ppm to ensure engine reliability. Above this threshold, the biogas supply to the engine is automatically stopped in order to protect it from damage caused by hydrogen sulphide attack. 
After 4 months of operation with CamPure 32 , the downstream H2S concentration remains stable below the threshold value (cf. diagram).

The media is available in the form of a 500 kg big bag or in the form of a 28 L carton.

Pascal’s and Pierre-Charles’s testimony from the GAEC 

“CamPure 32 has the advantage of having an attractive price compared to other activated carbon in the market while having an excellent H2S adsorption rate. The life time of the product should be longer, which will allow us to delay the media replacement. 
We could also notice that the quantity of dust during the can loading/unloading was low.” 

MAIN ADVANTAGES OF CAMPURE 32 MEDIA:

  • High-quality chemical adsorbent
  • Ideal for biogas applications
  • Effective for the treatment of Hydrogen sulphide (H 2 S), Sulphur dioxide (S0 2 ), and Nitrogen dioxide (NO2)
  • UL 900 rated for flammability
  • Available in 500 kg big-bags and 25 kg boxes
  • Vacuum packed to ensure its high quality and low dust content
Created June 4, 2021