The Aquilair process chemically treats dirty air in a counter flow system with aqueous solutions. This takes place in wet scrubbers operating in series. Within the scrubbing towers, an inert material enhances the contact between the gas and the liquid.

Depending on the properties of the component to be removed, a neutralising agent (base or acid) is added to the treatment water to accelerate gas-liquid transfer and therefore the treatment efficiency. The addition of an oxidising agent accelerates this transfer process on the one hand, and regenerates the wash water on the other, while modifying the absorbed molecules.

Aquilair is designed to treat highly concentrated gaseous effluents that may have concentration of odorous components as high as 100 mg/m3.

This highly reliable technique achieves treatment levels in excess of 99%, ensuring the total absence of odour-induced pollution.

The characteristics of the packed bed (properties, specific surface area, volume, height) are designed to optimise the gas-liquid contact time as well as the transfer of molecules.

Several stages are required according to the quality of the odors to be removed. Neutralising agents (Acid or basic) are added to improve the transfer of different compounds. To eliminate odorous molecules, oxydant is also injected.

Aquilair includes from one to four scrubbers, usually installed in tower :

• The first tower, known as the 'acid' tower (pH between 2 and 3) is dedicated to remove nitrogen compunds.
• The second and the third towers, operated in basic conditions (pH 9 and pH 11) with the addition of an oxydising reagent, are dedicated to remove sulphure compounds (H2S, Sulphides ...)
• The last tower, where a reducing agent is added, is operated at neutral pH and is used to trap aldehydes and kelones.

Aquilair is a modular technology designed to fit into general architecture of the treatment works, which can be adapted to all future extensions. This process can be used to a wide range of air flow rates and therefore is adapted to all sizes of wastewater treatment plants.

• Aquilair is a fully automatic process, which can deal with loads variations without affecting the quality of the air discharged.
• Aquilair does not require any special monitoring.
• Aquilair achieves consistent air discharged quality (efficiency above 99%) and is adapated to the most stringest situations such as underground or zero nuisance plants.