H₂S Removal
Solutions for H₂S removal from biogas and odor control
Hydrogen sulfide (H₂S) is a toxic, corrosive gas commonly found in biogas. Its removal is essential to prevent corrosion, ensure operational safety and increase equipment lifespan.
We provide natural iron-based solutions acting in both liquid and gas phases.
The removal of this compound is essential not only for operational safety reasons, but also to prevent corrosion processes in pipelines, equipment and biogas energy recovery systems, ensuring greater efficiency, operational reliability and extended service life of the installations.
We are leaders in the national market, offering products based on natural iron oxides and hydroxides for H₂S removal. Our products act both in the liquid phase of the biodigester (substrate) and in the gaseous phase (biogas), as well as in the treatment of residual gas for odor control, providing efficient H₂S control.
Our solutions were developed to:
- remove H₂S during biogas treatment
- increase methane production
- prevent equipment corrosion
- control odors from different sources
- improve the efficiency of biogas and biomethane plants
Iron-OX®
Powder product used for the removal of dissolved sulfide in the liquid phase of biodigesters.
Environ-OX®
Granular product developed to remove H₂S directly from biogas or for odor control in sewer networks and wastewater treatment plants
Reduction of dissolved sulfide in the liquid phase of the biodigester
Iron-OX® is a powder product composed of a mixture of natural iron oxides and hydroxides, developed to reduce the concentration of dissolved sulfide in the liquid phase of biodigesters.
Its application is carried out directly in the substrates that feed the biodigesters, promoting the reduction of sulfur levels before biogas formation.
By controlling dissolved sulfide in the liquid phase, Iron-OX® significantly reduces H₂S levels in the biogas generated during biodigestion.
Main benefits of Iron-OX®:
- Efficient reduction of dissolved sulfide
- Lower H₂S concentration in biogas
- Increased methane production
- Low application cost
- Does not cause sedimentation in biodigesters
- Non-toxic product
- Does not affect the application of digestate or sludge to soil
- Ability to buffer load variations in the plant
- Does not require biodigester aeration
- Applicable to any type of substrate
Essa solução permite melhor estabilidade operacional do biodigestor e maior eficiência no aproveitamento energético do biogás.
Increase in methane production
BMP (Biochemical Methane Potential) tests have shown that the application of Iron-OX® can significantly increase methane production.
Results obtained for different substrates:
Substrate
Increase in methane production
Sugarcane vinasse
Swine production
Cattle farming
Up to 10%
The tests were conducted under controlled temperature and pH conditions, using sludge from UASB reactors treating real wastewater.
Environ-OX®
H₂S removal in biogas and odor control
Environ-OX® is a granular adsorbent developed to remove H₂S directly from biogas or for odor control in sewer networks and wastewater treatment plants, applied in adsorption filters.
The material is composed of natural iron oxides and hydroxides combined with chemical additives, providing high adsorption capacity.
This solution is ideal for:
- external desulfurization in biogas plants
- protection of gensets, compressors and other equipment
- biomethane production
- odor control
- increased operational safety
Main benefits of Environ-OX®:
- High efficiency in H₂S removal
- Achieves 0 ppm H₂S at the filter outlet
- Operation with wet biogás
- Low pressure drop
- In situ regeneration with atmospheric air
- Excellent cost-benefit ratio
- Disposal as non-hazardous waste
- Simple and safe process
Iron-OX® and Environ-OX® products can be used in various applications within the biogas sector:
- biodigesters treating agricultural or industrial waste
- agro-industrial biogas plants
- biogas plants in wastewater treatment facilities
- andfill biogas plants
- biogas upgrading systems to biomethane
- odor control systems
The combination of both technologies enables more cost-effective and efficient H₂S control in biogas, biomethane plants and odor treatment systems.
Óxido de Ferro Rio Acima products stand out by offering a superior cost-efficiency ratio compared to market alternatives. As a 100% Brazilian company, we ensure logistical agility and fast sales and after-sales service throughout Brazil.
Our multidisciplinary team, composed of MSc and PhD professionals, provides specialized technical consulting to optimize product application and maximize results.
Iron-OX® Yellow
Natural iron hydroxide with yellow coloration.
Non-toxic product.
Iron content (Fe): 54% – 60%
Particle size:
MESH 100 (149 μm)
MESH 250 (63 μm)
MESH 325 (44 μm)
Packaging:
25 kg, 1,000 kg and 1,250 kg
Iron-OX® Red
Natural iron oxide with red coloration.
Non-toxic product.
Iron content (Fe): 54% – 60%
Particle size:
MESH 100 (149 μm)
MESH 250 (63 μm)
MESH 325 (44 μm)
Packaging:
25 kg, 1,000 kg and 1,250 kg
Environ-OX®
Product composed of a mixture of natural iron oxides/hydroxides and chemical additives. Non-toxic.
Density: 1.3 ± 0.2 g/cm³
Iron content: ≥ 42%
pH: 11 – 12
Particle size:
2.00 – 3.35 mm
3.35 – 4.00 mm
Minimum gas humidity: ≥ 60%
Our technical team can help define the best H₂S removal strategy for your biogas plant.
Laboratory
To ensure maximum efficiency of the applied solutions, Óxido de Ferro Rio Acima operates a technological laboratory dedicated to Research & Development and product quality control.
This structure allows the evaluation of different operating conditions, execution of technical tests and optimization of the application of Iron-OX® and Environ-OX® products across different types of substrates and biogas and biomethane plant configurations.
The laboratory features:
- dedicated infrastructure for biogas analysis
- strict quality control
- highly qualified multidisciplinary team
- continuous investment in R&D
- technical partnerships focused on sustainability
Our infrastructure ensures specialized technical support and greater reliability in the application of solutions.