Products

#### What are the Odour Neutralizers?

These products are the result of the study of natural plant substances (flowers, fruits, herbs, roots, etc.) and the development of processes of industrial biosynthesis in order to design complex mixtures of fragrances and essential oils which can neutralize any odour and gas emission coming from industrial manufacturing processes, wastewater treatment plants and zootechnics.

Unlike the traditional air fresheners, the odour neutralizers of the MasterDeo line do not mask the smells in the air but neutralize them completely.

#### Activities

The neutralization relies on the chemical or physical destruction of the molecules that build the odours.

###### We know how to eliminate the odours, without masking them.

Analytical methods: gas chromatography, mass spectrometry valid for specific substances dissolved in gaseous fluids. They do not reveal the origin of olfactory harassment .
Olfactometric method: human noses, appropriately selected assessors trained to recognize the intensity and the pleasantness of odours.
Sensory methods: electronic noses, biosensors that combine the action of olfactory receptors and physical-chemical transducers of the signal.
Olfactometric Unit (OU) expresses a value that combines the odour concentration threshold and its air dilution.

vegetable extracts of plants, herbs, flowers, fruits and essential oils, properly mixed to act specifically against any odour molecule.
common excipients (propylene glycol) and surfactants (which make them soluble in water).

How does the neutralization of odours work against some specific mixtures that contain these functional groups?

Es. 1) ${H}_{2}S$ : the process of chemical decomposition of ${H}_{2}S$ occurs by chemical interaction of the amine functional group $R\text{-}N{H}_{3}$ that is: $R\text{-}N{H}_{3}+{H}_{2}S$ $R\text{-}N{H}_{3}+SH$ $R\text{-}N{H}_{3}+SH+{O}_{2}+{H}_{2}O$ $R\text{-}N{H}_{3}+S{O}_{4}+OH$ $R\text{-}N{H}_{3}+S{O}_{4}+OH$ $R\text{-}N{H}_{3}+S{O}_{4}+{H}_{2}O$ in that reaction, the hydrogen sulphide is captured by the amino functional group. With oxygen, a non-volatile compound containing sulphate is then formed.

Es. 2) $N{H}_{3}$ : the process of chemical decomposition of $N{H}_{3}$ is made per condensation by the functional acid group $R\text{-}COOH$ namely: $R\text{-}COOH+N{H}_{3}$ $R\text{-}COON{H}_{4}$ the ammonia is captured by the functional acid group $COOH$ and a no more volatile compound containing ammonium salt is formed.

The odour neutralisation occurs with different chemical reactions for each substance which has to be treated:

Construction the foul-smelling gas reacts chemically with the neutralizing molecule and forms an odourless compound (ammonia).
Combination the foul-smelling gas is combined with a pleasant odour forming a third lightly scented or unscented product (chlorine derivatives).
Counteraction when you add to a bad smelling substance another one that opposes to it, interferes with it and finally eliminates the odour (derivatives of sulphur).
Absorption a foul-smelling substance is absorbed by the neutralizer and forms an odourless product (styrene).
Chemical reaction all the ingredients of the neutralizer interact with the bad odours and form an odourless product (mercaptans).
Collection the micelles of some ingredients capture the odour molecules in the air, they create then a heavy drop that falls to the ground and holds the odours.

Neutralization in the air: indoor application, wastewater treatment plants, sludge accumulation tanks, porous floors, toilets, urinals, scrubbers and fireplaces.
Contact neutralization: landfills, composting plants, waste disposal, sludge tanks, wastewater treatment plants, septic tanks, stables, farms, chemical toilets and well drains

#### More details

The odour neutralization against the smell pollution

The problem of the odours from industrial and composting plants, landfills, wastewater treatment plants etc. is becoming more and more important. Nowadays at a national level there are no specific regulations and no limit values for the odour emissions. The current legislation about the air quality, the waste and the wastewater treatment refers however to the prevention and the reduction of odour annoyance. Some Regions have already introduced some laws and regulations regarding the reduction of the odour emissions and have set the upper limits of emissions in the atmosphere before the forthcoming adaptation to European guidelines. The “odour annoyance” is part of the regulations concerning the emissions of pollutants in the atmosphere, even though there are no benchmarks to verify the intensity of the odour emissions. The bad smell is considered as a true form of environmental pollution.