Sustainable Filter Systems.

Australian designed, engineered and manufactured.

Oxidizing Filters

FiltaCIFTM catalytic iron filter series, iron oxidizing air phase filtration system for the removal of high concentrations of Hydrogen Sulphide and Mercaptans.

Benefits of FiltaCIFTM catalytic iron filtration systems:

• Suitable for controlling large volumes of Hydrogen Sulphide (H2S) and Mercaptans
• Suitable for municipal sewer waste water treatment plants, industrial applications e.g. methane gas recovery and intensive animal farming
• Hydrogen Sulphide (H2S) removal rates typically of 60 - 80%
• Mercaptans removal rates of typically up to 50%
• Typically can treat variable gas volumes of 100-1000ppm and larger.
• Air flow rates from 50 – 10,000m3/hr.
• Reduce running costs for 2nd and 3rd stage filtration by extending media life.
• Long media life of typically 5 – 10 years depending on volume.
• Modular robust construction
• Efficient water usage
• Small footprint
• Flexible design to suit height or surface area restrictions
• Low environmental impact
• Non toxic waste products of Sulphur and Water

About FiltaCIFTM catalytic iron filter technology

The FiltaCIFTM catalytic iron filter (CIF), or sometimes known as a rusty iron catalytic filter, is a filter for removal of high loads of Hydrogen Sulphide (H2S) from a foul air stream and is often used as a roughing filter for the first stage of a system with a carbon filter installed as the second stage polishing or scrubbing unit. It essentially protects and limits the volume of H2S being processed by the polishing media (normally activated carbon) thereby extending the life span of the media and reducing operational costs. The advantages of CIF are that no chemicals are required, there is low water consumption and it gives improved performance at the second stage. Additionally they often have a small footprint and can be installed outdoors.

Operation and properties of a FiltaCIFTM catalytic iron filter:

The inlet air duct carrying the foul air first passes through a humidifier unit to condition the air stream to 80%+ humidity and then flows to the top of the CIF vessel. The flow of foul air through the CIF unit is downward. There are multiple separate media beds within the vessel consisting of hydrated rusty iron pall rings. As the airflow passes through the pall ring media and the hydrogen sulphide or mercaptans is oxidized by the iron oxide on the surface of the iron pall rings. Iron or mild steel pall rings with a high surface area design are used to maximise the area to which the air can make contact. Another benefit of pall rings is their slender aspect ratio which prevents channeling through the media bed which maximises contact time. Contact time is normally engineered for 12 – 15 seconds residence time in order to achieve optimum removal efficiency. The vessels contain multiple media beds for the pall rings, this is to prevent the media crushing during operation. Depending on the volume of pall rings and bed area within the vessel, this will dictate the quantity of beds required. Generally the top media bed will need to be changed every three - five years as it takes the majority of the gas load and both beds will typically require changing at least every ten years. A CIF can affectively operate in a range of temperatures fro 5o – 35oC. The CIF unit would normally be followed by further 2nd and possibly 3rd stage odour treatment.

The water industry use CIF units as pre-filters to extend the operational life of the second stage carbon based dry media scrubber units. The catalytic iron filters require a small area footprint and are suitable for installation outdoors, being manufactured from corrosion free HDPE. The introduction of the CIF units as a pre-filter does not introduce a significant increase in operational pressure on a system and by using small energy efficient motors on the fan units, this will reduce operational costs.

Reference Documents:

White Paper - "Rusty Iron - A cost-effective odour control upgrade for overloaded systems" by D. Brooker, I. Evanston and A. Shammy - Click here to download

Our Aim!

Bioaction works closely with its clients in providing the most suitable and cost-effective solution for their particular application. We pride ourselves in providing the highest level of workmanship and customer service. We are recognised for our evolving innovation and commitment to the science of odour abatement.


Our Staff

The team at Bioaction are fully skilled to walk a client through the most suitable design for there specific application.

  • Design
  • Engineering
  • Construction
  • Installation
  • Commissioning
  • Maintenance

Contact Us

  • PO Box 3822, Tuggerah,
    NSW, 2259

    H.O: 12 Mildon Road
    Tuggerah, NSW, 2259

  • Phone: +61 (0) 2 4353 4822

  • Fax: : +61 (0) 24384 0948

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