OMNIATEX IMPIANTI CHIMICI Srl has always been working, since more than 30 years, in the field of Engineering, Manufacturing, Erection, Start-up and Commissioning of advanced technology chemical plants, mainly specialized in environmental air pollution control systems and solvent recovery plants. The production mainly involves adsorption, absorption, distillation and filtration plants.

 

Final destination of the plants manufactured by OMNIATEX are mechanical shops, synthetic leather production, rotogravure printing of magazines, food production, printing of flexible packaging for foodstuffs, production of special papers, rubber belts and conveyors, adhesives films and tapes, waste eater treatment plants, automotive parts and distilleries for drinking spirit.

 

The very long experience in the field, has permitted OMNIATEX to develop special plants dedicated to the adsorption of bad smelling emissions, exhausted into the atmosphere by several production processes.

 

Several industrial process are exhausting bad smelling emission that, with time, are becoming a noxious problem for the environment around the production site. The bad smell is mostly due by organic molecules of several different types, most common is those of the hydrocarbons, and by some byproducts developed by their oxidation, by sulfur derived molecules, like mercaptans or nitrogen derived molecules like ammines.

 

 
MOST appliED fields FOR odors abatement
Animal and vegetal fats recoveryHumus production
Baking of fats and foodsIndustrial breeding
Chemical plantsMalls air purification
Coffee roastingNatural gas odorizing
Commercial and industrial kitchensPaper and cellulose industry
Cosmetics productionPharmaceutics
Distilleries and beverages productionSlaughterhouses
Fertilizer productionSoaps and cleaners production
Fish flour productionSugar and oils refineries
Food industryUrea/Formaldehyde production
FoundriesWaste water treatment plants

 
SECTEURS PRODUCTIFS ET LEUR REJETS
Rotten meat

Putrescine

Ammoniac

Ethylamine
Production of foundry coresTriéthylamine
Fats combustionAcroléinFish meal production

Amine

Fat mists

Ammonia
Foods baking

Ammonia

Fats mists

Sulfur dioxide
Production of synthesis pharmaceuticalsEthylmercaptane
Excrements

Indole

Skatole
Syrup fruits productionSulfur dioxide
Mud and sludge drying

Formaldehyde

Mercaptans

Hydrogen sulfide

Ammonia

Styrene
BreathingButyric aldheyde
urea/formaldehyde resins dryingFormaldéhydeMoquettes spreading

Triéthylamine

Mercaptans

Ammonia-Formaldehyde

Hydrogen sulfide

Sulfur dioxide
Sewer

Methylmercaptan

Ethylmercaptane
Glass bottles sterilizationSulfur dioxide
Light alloys foundries

Triéthylamine

Phenol

Ammonia

Methyl Chloride
Sweat, animal smelling

Caprylic Acid

Valeric Acid
Tobacco smoke

Nicotine

Pyridine
Biological treatments

Ammine

Mercaptans
Natural gas odorizationMercaptansVegetables (onions, garlic)Ethylmercaptane

 



seuil de perception des differentes SUBSTANCES
ComponentppmwppmvComponentppmwppmv
Acétaldéhyde0,21Hydrogen sulfide0,180,12
Amyl acetate10,19Indole0,001
Acétone240100Iodoform0,0017
Acetic acid2,51Isoamylmercaptan0,00043
Butyric acid0,000060,001Méthanol260100
Valeric acid0,0062Méhylamine0,0250,021
Ethyl Acryl ate0,0020,00047Métyléthycetone29,510
Acrylonitrile4821,4Méthylisobuthylcetone1,90,47
Acroléin0,530,21Methylmercaptan0,00220,0011
Ammonia3346,8Méthylmetacrylate0,860,21
Sulfur dioxide41,6Mono chlorobenzène0,21
Benzene4,68Monomethylammine0,0250,021
Bioxyde di souffre0,47Artificial musk0,000005
Bromine0,30,047Nitrobenzène0,00230,0047
Chloral0,047Ozone0,050,025
Chlorine10,314
Para créosol0,001
Chlorocetophenone0,0160,0027Para xylene20,47
Ally chloride1,50,47Tetrachloroéthylène31,354,68
Benzyl chloride0,240,047Pyridine0,060,021
Methyl chloride22,211Methyl salicylate0,065
Methylene chloride100Skatole0,0012
Créosol0,0560,012Benzyl sulfide0,0060,0021
Crotonaldéhyde0,062Carbon sulfide0,770,21
Sulfur dichloride0,001Hydrogen sulfide0,00047
Diphényléter0,00120,1Biphenyl sulfide0,0047
Diméthylacétamine46,8Bimethyl sulfide0,001
Diméthylformamide300100Styrène0,190,047
Ethanol10Carbon tetrachloride71,8
Ethylmercaptane0,00020,0001Carbon tetrachloride (CH4)100
Phénol0,280,047Carbon tetrachloride (CS2)21,4
Formaldéhyde1,51Toluene82,14
Phosphine0,0280,021Toluene diisocianate2,14
Phosgène5,61Tricloroetilene114,521,4
Gaz HCl1410Trim ethylamine0,00021
Vanillin0,00008

 

  

The main theoretical concept that is the basis for the abatement process is the Absorption and the Adsorption.

 

The adsorption Process by activated carbon is a simple method, but with high retentivity efficiency for the neutralization of bad smelling agents contained in a gaseous flow.

 

The adsorber medium is activated carbon, derived from vegetal raw material, thermically treated to obtain a porous material with a very large activated surface. The vegetal carbon is the best adsorption medium, higher than a mineral one, and different impregnation processes raise the abatement efficiency for special smells.

 

 

The quality of an activated carbon is based upon its activated surface, which is measured in B.E.T. (acronym of the names of the three scientists who have realized this analysis method), expressed in square meters of active surface per gram of carbon.

 

Usually for air pollution treatment is used an high activity carbon with more than 1100 m2/g of B.E.T. and OMNIATEX uses a very good carbon, with at least 1250 square meters per gram of active surface.

 

The adsorption is a mass transfer Process, as the air flow components pass from the air stream into the carbon pores. The polluting components molecules are attracted by the activated surface of the carbon by forces called Van der Waals, from the name of the scientist who has studied this physic phenomenon.

 

The progressive formation of multiple layers of liquid components in the inner part of the pores reduces gradually the strength of the Van der Waals forces up to the point in which equilibrium is reached and no more components are captured by the pores.

 

The retention efficiency of the carbon, besides the activated surface, is given by:

v            Pollutant's chemical and physical features
v             Activated carbon’s owns chemical and physical features
v             Distribution and size of the pores in the carbon
v             The air stream velocity through the carbon
v             The carbon bed depth
v             The relative humidity of the air stream
v             The temperature of the air stream
v             The pollutant  concentration in the air stream
v             The pressure of the adsorption Process

  

The adsorption capacity of the carbon at the equilibrium and to a given temperature and pressure, is plotted in a diagram called ISOTHERM on which for each solvent concentration (or partial pressure) is indicated the adsorption capacity expressed as percentage of solvent retained by the carbon.

 

The adsorption Process proceeds through several steps before the equilibrium is reached. At the beginning the pollutant odor is completely retained by the carbon and the air stream that leaves the carbon bed is completely odor free. Progressively the polluting components fill the pores of the carbon reducing the action of the Van der Walls forces and the polluting mass transfers along the carbon bed until the moment in which some odor appears in the air stream after the carbon bed. This step is called BREAKTHROUGH.

 

When breakthrough is reached the carbon bed of the plant must be regenerated or changed to put again the plant in the optimized adsorbing condition of the beginning, to continue to abate the odors.

ITALY: air deodorization on a waste water treatment plant

 

If the carbon bed can be regenerated “in situ” (on site) the efficiency of the regeneration is mainly affected by:

 

v      Polluting agent chemical and physical features

v       Activated carbon chemical and physical features

v       Length of the regeneration process

v     Mechanical force made by the regenerating medium inside the pores of the carbon

 

Main applications fields of the abatement and deodorization plants are:

 

v      Treatment of air flow coming from covered waste water treatment pools

v      Treatment of air coming from town gas odorizer filling rooms

v      Treatment of air flow will weak solvent concentration

v      Treatment of bad smelling air flows

v      Treatment of baking and curing ovens vents

 

The manufacturing configuration of the plant follows the final destination and service of the plant itself. This means that the plant could have filtering panels, filtering cartridges or adsorbing vessels.

 

 

Usually in the first two cases, the carbon cannot be regenerated and must be emptied, when filled with the polluting agents, and disposed off, filling again the component with virgin carbon. This operation is manually or automatically operated, depending from the plant size.

 

When large adsorbing vessel are employed, typical technology used for the treatment of air flows coming from waste water pools or odorizer filling rooms, the activated carbon is regenerated on the plant premises, with a special unit, and can be reused for a very large number of odor abating cycles before its substitution is needed.

 

The proved experience has allowed the development also of special plants for the   abatement of organics and inorganics exhausted into the atmosphere by several production processes. 

The produces plants are based mainly on the absorption process and OMNIATEX is an European Leader in hydrocarbons abatement with many plants operating in the DMF, Ethanol and Methanol abatement. 

For the abatement of bas smelling inorganics, plants are in operation for the abatement of Acetic Acid, Ammonia, Hydrochloric Acid and Sulfur Dioxide. 

Different technologies allows to use, as abatement medium, oils, water and water solutions to face and to solve the various problem given by the different productions. 

The abatement plants efficiency is very high for several composants, allowing, the most of the time, also the recovery and sometime the re-use of the abated pollutant with a secondary plant.

Italy: Absorption plant for the abatement of Ammonia from baking ovens

 

Inorganics abatement plants are employed both in the mechanical field and in the food industry. Is to be pointed out that, added to the abatement of acids in the mechanical industry (for example in the hot dipping galvanization of metallic pieces) byproducts can develop due to reactions and decomposition also in the food field. This is the case of the Sulfur Dioxide and the Ammonium, used as preserver and expander.

 

The efficiency of an abatement plants is the result given by many factors, all concurring to achieve the final result and the most important are:

 

          v             Pollutant chemical and physical features

           v            Absorption medium chemical and physical features

          v             Internal dimension and distribution

          v            Air velocity trough the plant

          v            Theoretical stages and adopted real number

          v            Polluted air humidity

          v            Air temperature

           v            Pollutant concentration in the air stream

Italy: Abatement plant for Sulfur Dioxide

 

The plants are mainly scrubbers with internals in structured packing and automatic suction system regulated continuously by inverter to obtain the best optimization of the operating costs.