Photoionisation systems for odour control

Photoionisation systems for odour control

Odour emissions from industrial practices and waste water treatment plants are under continuous regulatory and public scrutiny. Enva has a range of odour abatement solutions, depending on the source and root cause of odour emission, to help companies remain compliant with their license requirements. Enva works with consulting engineers and utility companies to manage odour control at all steps of wastewater and sludge collection, treatment and disposal.

NEUTRALOX® photoionisation for off-gas treatment and odour control

Enva is the sole supplier of Neutralox technology in the UK and Ireland. Neutralox provides a physical-chemical treatment technology. It does not require chemicals, has a small footprint, low operational and maintenance cost and is not sensitive to varying loads.

Neutralox works by photo-ionisation. Strong oxidising agents are produced by UV light which oxidises odorous substances in the presence of a catalyst. Typical applications are,

  • Sewage pump stations, lift stations, vacuum stations
  • Headworks, screen buildings, influent channels
  • Sludge holding tanks, thickeners
  • Sludge dryer, ATAD
  • Dewatering buildings
  • Waste water treatment

Neutralox systems are also applied in industries, which – due to manufacturing processes - cause odour issues to the local environment.

The equipment is high grade steel, of modular build and delivered as pre-mounted compact units. Required footprint is small and the energy demand is considerably low. Systems are designed to keep maintenance and operation requirements to a minimum and offer high reliability.

Pilot units are available for on-site testing and evaluation. To find out more, or to arrange a trial, please contact us.


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  • Effective treatment of highly concentrated and varying odours
  • Particularly effective on all reduced sulphur compounds
  • No water or chemicals required
  • Can easily be turned on/off and begins working immediately - easily handles spikes/ peaks
  • Very small footprint and modular design
  • Low energy requirement and low maintenance demand.
  • Operates over a wide temperature range
  • Flexible installation – units may be installed indoors/outdoors, over ground/underground.
  • Ex rated systems are available, if required.
  • Proven technology - over 400 installations worldwide

Contact Us | Arrange onsite testing and evaluation 

Neutralox Umwelttechnik GmbH is a German manufacturer for turnkey odour control and off-gas treatment plants and was founded in 1999 by a group of experts with experience in odour control, off-gas treatment and ventilation systems.  Neutralox Umwelttechnik GmbH maintains a worldwide sales and service network with official representations on six continents. The technology is proven with over 400 installations worldwide.

Enva is the sole supplier of Neutralox technology in the UK and Ireland. Pilot units are available for on-site testing and evaluation.

Contact Us | Arrange onsite testing and evaluation 

Photoionisation is a method of effective and reliable elimination of odours. Photoionisation is mostly used for treatment of odours released by waste, wastewater (sewage) and wastewater sludge. The technology has been used successfully in the market for more than 15 years.

Photoionisation basically describes the oxidation of substances under radiation of UV-light in presence of catalysts. The photoionisation process produces strong oxidizing agents via UV-light ionisation. These agents oxidize the odorous substances in presence of catalysts.

NEUTRALOX technologies are based on physical-chemical treatment methods. These treatment methods are characterised by the physical generation of oxidants, which are utilised directly or with the help of catalysts for oxidation of odour compounds and other pollutants. The high grade equipment is very effective and reliable. The dependency on external resources and conditions is considerably low.

Contact Us | Arrange onsite testing and evaluation 

Enva offer expert services and products across the entire municipal and industrial waste water treatment process, from the reception of waste waters right the way through to final treated effluent. Our customers benefit from this deep knowledge and product range, backed up by our comprehensive and fully accredited water labs.

We have a range of odour abatement solutions, depending on the source and root cause of odour emission, to help companies remain compliant with their site license requirements.

  • Air scrubbing systems
  • Photo-ionisation systems
  • Activated carbon
  • Odour control misting & dosing systems
  • Odour control chemicals

Contact Us | Request further information | Water and Industrial Services brochure 

An odour management and monitoring plan can act as both a statement of intent to manage odours on site, as well as an instruction manual for management and employees that can be consulted whenever necessary. A good plan will integrate odour management into daily routine, so procedures for the management of potential odour issues become second nature to site staff. Read more

Contact Us | Request further information | Odour control best practices

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