Iron hydroxide concentrate is a source of reactive iron based on Fe(OH)₃, intended for efficient hydrogen sulphide removal directly in the digester of a biogas plant.

The product contains 90% dry matter, which ensures high reaction efficiency and minimal reagent consumption.

Product type: powdered iron hydroxide
Main component: Fe(OH)₃, FeO(OH), traces of FeO, Fe₂O₃
Dry matter: 90%
Delivery form: powder

Principle of H₂S removal
Active iron reacts directly in the substrate:
Fe(OH)₃ + H₂S → FeS ↓ + H₂O

It forms:
insoluble iron sulphide which prevents the re-formation of hydrogen sulphide in the biogas.

Why a high dry matter content is important
High dry matter concentration (>90%) reduces transport cost per unit of active iron. In Fe Concentrate 35-37% active material. 

Advantages of Fe Concentrate:

• lower transport costs
• fast H₂S reduction effect
• operation directly in the digester
• no corrosive impact, safer than FeCl₃
• does not affect the biological process
• reduces load on activated carbon filters

Typical dosage 0,8 kg / t substrate. Depends on:

• H₂S concentration
• process temperature
• substrate type
• organic loading rate

Example
For a 1MW electric power 100% maize silage-based biogas plant or 4 tpd biomethane per day the usage is 40 kg/day on the constant basis.  With the usage of the iron hydroxide in the biogas reactor the sulphur level in biogas is reduced from 1500-2000 ppm to 60-80 ppm.

Packaging:
- bags
- big-bags

Supplied:

• Pallets 1 ton

Safety data sheet according to Regulation (EC) No 1907/2006, Article 31 are available