Slide background Neutralox Odour Control - High efficiency, compact photoionisation alternative
Ideal for effective removal of problematical industrial wastewater treatment odour

NEUTRALOX Odour Control

The Neutralox Photoionisation system is a highly effective alternative odour control process compared to biofilters and chemical scrubbers with lower capital costs and simple operation.

The NEUTRALOX new generation of odour control utilises UV light and catalysts to break down odourous compounds in air in a highly efficient and compact process called Photoionisation.

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Photoionisation explained

The NEUTRALOX® Photoionisation process is a physical-chemical off-gas treatment process for control of odours originating from waste, sewage and sludge- treatment processes. The technology is essentially based on the application of UV-light and catalysts.

In addition to odour reduction, extensive air disinfection is also provided with the photoionisation treatment process.
Photoionisation, Fotooxidation, inlet structure
The NEUTRALOX® Photoionisation process
The raw untreated gas first passes through a dust filter which is contained in an easily accessible compartment of the system. The dust filter pressure drop is controlled by a pressure gauge mounted at the unit which will activate an alarm when it requires cleaning or replacing. The off-gas then passes through the UV-compartment where UV-light initiates catalytic enhanced chemical reactions which result in significant reduction of odour.

The linkages of odour molecules are broken-up by the UV-light and the reaction between UV-light and naturally occurring constituent within the air also creates additional oxidants to further degrade or otherwise eliminate odours. The reaction is enhanced by photocatalysts. The catalyst provides further degradation of odorous compounds and prevents the release of oxidants into the atmosphere.

The downstream fan ensures extracting the polluted air from the odour source by keeping the whole system under negative pressure conditions.

nestralox diagram

The NEUTRALOX® Photoionisation system assembly
NEUTRALOX® Photoionisation units are of modular build-up to allow future expansion. The Photoionisation units are delivered as compact pre-mounted units which minimises installation demand at site.

NEUTRALOX® Photoionisation units essentially consist of housing, dust-filter, UV-compartment and catalysts.

The housing is manufactured of stainless steel (AISI 304 or AISI316 – depending on local requirements). The housing consists of an insulated double wall (sandwich build-up) suitable for the respective environmental conditions. All components are easily accessible from the front and/or back side through removable maintenance doors.

Photoionisation benefits

Effective treatment of all odour substances (not only H2S)
Effective treatment of high odour concentrations
Effective treatment of varying odour concentrations
High treatment efficiency (99,x%)
Low investment costs (small footprint, small foundation, no peripheral equipment)
Low operational costs: only electricity required for operation
Low maintenance costs: exchanging consumables only every 1-2 years
Switch ON – switch OFF technology- operates immediately
Flexible installation: units may be installed indoors or outside
Minimal footprint.
Fully automatically operation.
Very low power demand
Ex rated systems are available

Example installations

pump station
Neutralox photoionisation plant treating odour from a pump station.
sludge tank
Neutralox photoionisation plant treating odour from a sludge tank at an industrial site.
Photoionisation, Fotooxidation, wwtp
Neutralox photoionisation plant treating odour from an underground industrial wastewater balance tank.
gallery_neutralox_5Neutralox photoionisation plant treating odour at a sewage treatment plant.

How does the Neutralox Photoionisation system work?

gallery_neutralox_7Photoionisation describes a physical-chemical treatment method for oxidation of odours and other air emissions, originating from waste, sewage and sludge treatment processes.

Photoionisation is essentially based on the application of UV-light and catalysts. The UV-light creates strong oxidizing agents (O-2, OH-, O3 , activated O2 and other free radicals) that begin to oxidize the odor causing compounds.

A downstream catalyst provides a surface, for oxidation of odour compounds.

nestralox diagram

What are the benefits of the Neutralox Photoionisation process?

gallery_neutralox_1Photoionisation is very effective and can achieve odour reduction rates of more than 99%.

The main benefit of the system is essentially in the ease of the process.

Furthermore, photoionisation has no requirements regarding inlet air and odour conditions as temperature and humidity variations in the load do not influence or harm the process. No water or chemicals are required for treatment and no side-streams produced.

Maintenance demand is minimal and limited to exchanging inlet filters, UV-lamps and catalyst material every 1-2 years.

Why is photoionisation the preferred choice compared to alternative odour control systems?

gallery_neutralox_2Many of our customers have installed multiple systems and repeat orders are common. When asked why they install Neutralox systems over alternative processes their answers are usually:

1. The system eliminates virtually all odours and

2. The operation and maintenance demand is negligible.

What is photoionisation used for?

gallery_neutralox_6Neutralox Photoionisation systems are usually used for the elimination odour generated by wastewater and sludge often found on municipal and industrial wastewater treatment plants. We have considerable experience in the treatment of odours from municipal treatment plants as well as in the food industry such as dairies, and abattoirs.

What else Photoionisation can do?

neutralox_gallery_6Besides odour reduction, Neutralox Photoionisation provides extensive air disinfection, too.

Analysis has shown, that Photoionisation reduces the number of coliform forming units (CFU) to below the ambient level – just as an by-effect of odour reduction!


e31cdc_e98388b0d3a64764b4647b79b665526aNeutralox Umwelttechnik GmbH is a German manufacturer of odour control equipment with primarily application in the elimination of odours from wastewater treatment plants.

Bringing to the table more than fifteen years of market experience, Nuetralox offers expertise in providing high quality physical-chemical treatment solutions for odour control. The Neutralox Photoionisation process is highly regarded both in Europe and the United States and the rest of the world for its high treatment efficiency, operational reliability, and low O&M demand.

Neutralox Photoionisation is unique and represents a new generation of odour control technology.


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