​Advanced Odour, VOC & Industrial Air Treatment

Donaldson Group provides engineered solutions for the control of industrial odours, VOCs and contaminated process air.

Working with a range of specialist technology partners and equipment manufacturers, we are able to select and combine the most appropriate treatment technologies for each application — rather than relying on a single system or manufacturer.

Our solutions can be designed to control odour, volatile organic compounds (VOCs), hydrogen sulphide (H₂S), ammonia (NH₃), oil mist, aerosols, grease, smoke and airborne particles.

From compact local extraction and filtration units through to large-scale industrial air-treatment installations, every system is developed around the process, contaminant profile and required performance.

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Industries We Support

• Waste and recycling

• Anaerobic digestion and biogas

• Wastewater and sewage treatment

• Food and beverage processing

• Frying, roasting and smoking processes

• Rendering and animal by-product processing

• Organic and food waste treatment

• Composting

• Sludge treatment

• Agricultural and livestock applications

• Chemical and manufacturing processes

• Industrial kitchens and production facilities

• Other odour-intensive industrial processes

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Advanced UV & Oxidation

High-intensity UV and advanced oxidation technologies can be used to break down VOCs and odour-causing compounds within contaminated air streams.

Rather than relying solely on adsorption, oxidation can transform suitable organic compounds before the air passes through subsequent polishing stages.

These systems can be combined with activated carbon or specialist filtration media to provide highly effective multi-stage odour treatment.

Typical applications: food processing, waste treatment, wastewater, biogas, rendering and industrial process exhaust.

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Hydrogen Sulphide & Sulphur Control

Hydrogen sulphide and other reduced sulphur compounds can create some of the most challenging industrial odour problems.

We can incorporate specialist adsorption media, chemical treatment, oxidation and other technologies specifically selected for the expected H₂S and sulphur loading.

For more complex applications, sulphur treatment can form the first stage of a wider multi-stage odour-control system.

Typical applications: wastewater, sewage treatment, pumping stations, sludge processing, biogas, anaerobic digestion and organic waste.

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Ammonia & Amine Control

Ammonia and amines require careful consideration when designing an odour-control system.

Depending on concentration, airflow and process conditions, treatment options can include specialist chemically treated media, adsorption systems, biological treatment and wet or dry chemical processes.

These technologies can be combined with downstream carbon or other polishing stages where the exhaust contains a mixture of ammonia, VOCs and other odorous compounds.

Typical applications: food waste, rendering, wastewater, composting, agriculture, sludge treatment and biological processes.

 

Oil Mist, Aerosol & Particle Separation

Where process air contains significant levels of oil, grease, moisture or particulate matter, these contaminants should often be removed before the air reaches the main odour-treatment stages.

We can incorporate centrifugal separation, mechanical filtration, coalescing filtration and other pre-treatment technologies to protect downstream equipment and improve overall system performance.

In suitable applications, separated liquids or oils may also be collected for recovery or further treatment.

Typical applications: industrial frying, food production, roasting, rendering and high-oil or high-aerosol industrial exhaust.

 

Activated Carbon & Specialist Media

Activated carbon remains one of the most versatile technologies available for industrial odour and VOC control.

Different carbon grades and chemically treated adsorption media can be selected according to the compounds being treated, including specialist media for VOCs, hydrogen sulphide, ammonia and other difficult contaminants.

Carbon can be used as the primary treatment technology or, increasingly, as a final polishing stage following another treatment process.

 

Biological Odour Control

For appropriate applications, biofiltration and other biological treatment technologies can provide an effective, low-energy method of treating biodegradable odorous compounds.

Contaminated air is passed through specially selected media supporting microorganisms that naturally break down target compounds.

Biological treatment can be particularly attractive for continuously operating processes with suitable contaminant concentrations and air conditions.

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Wet & Dry Scrubbing

Where contaminant concentrations require it, wet or dry scrubbing can provide highly effective treatment for specific gases and chemical compounds.

Scrubbing can be incorporated as a dedicated treatment stage or combined with filtration, oxidation, adsorption and polishing technologies to create a complete air-treatment system.

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Multi-Stage Odour Control

Industrial exhaust streams rarely contain just one contaminant.

For this reason, Donaldson Group takes a multi-technology approach, selecting individual treatment stages according to the characteristics of the process.

A typical system might include:

Extraction → Particle/Oil Separation → Gas-Specific Treatment → UV/Oxidation → Specialist Media → Activated Carbon Polishing → Clean Air Discharge

The actual configuration is determined by the application.

This approach allows us to target different contaminants at the stage where they can be treated most effectively while protecting downstream equipment and helping to maximise media life.

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Designed Around Your Process

Every industrial odour problem is different and before recommending equipment, we consider factors including:

• Airflow

• Odour characteristics

• VOC concentration

• H₂S and ammonia concentrations

• Particle and aerosol loading

• Temperature

• Humidity

• Process variability

• Required emission performance

• Available space

• Energy consumption

• Maintenance requirements

• Consumable and media replacement costs

• Potential for heat, oil or material recovery

Where appropriate, sampling, testing and process trials can also be undertaken to help establish the most effective treatment approach.

 

From Individual Equipment to Complete Systems

Donaldson Group can support projects from a single point-source extraction requirement through to complete industrial odour-control installations.

By working with a range of specialist technology providers, we can bring together extraction, ductwork, fans, filtration, oxidation, adsorption, biological treatment, scrubbing, controls and monitoring into one engineered solution.

Our objective is straightforward:

Identify the contaminants. Understand the process. Select the right technologies. Engineer them to work together.

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Talk to Us About Your Odour Problem

Whether you are dealing with a localised nuisance odour, a difficult process exhaust or emissions from an entire industrial facility, Donaldson Group can help investigate the problem and develop an appropriate treatment strategy.

Rather than starting with a particular piece of equipment, we start with the air you need to treat and work backwards to the solution.