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P.T.C. System

DAVID Process



P.T.C. - The sustainable decontamination system

The emission of air pollutants is regulated by law because of their negative impact, including on human health, biological resources, ecosystems and climate.

These pollutants may be Volatile Organic Compounds (VOCs), Volatile Inorganic Compounds (VICs) and / or greenhouse gases.

Global VOCs emissions were estimated at around 1 billion tonnes in the year 2000. 90% of them come from natural sources (biological fermentations, natural gas leaks) and 10% from anthropogenic sources (from human activities).

Emissions of natural origin are evenly distributed over the surface of the Earth. On the other hand, anthropogenic emissions come mainly from industrialized countries.

VOCs can cause eye and throat irritation, allergies, headaches, asthma attacks, nausea, etc.

Some VOCs also play an important role in the troposphere, leading to an increase in the amount of ozone in the air. Ozone is produced inter alia from nitrogen dioxide under the effect of solar radiation. The formed ozone then reacts with nitric oxide to produce nitrogen dioxide. But, in the presence of VOCs, the previous cycle is modified by the carbon radicals (strong oxidants) which replace ozone during the reaction of formation of nitrogen dioxide, which leads to an increase in the amount of ozone.

The increase in the amount of ozone, with its consequences for the environment and health, is therefore partly linked to the release of VOCs.
In addition, greenhouse gas concentrations in the Earth's atmosphere have been increasing since the 19th century for mainly anthropogenic reasons, with a new record in 2014 according to the World Meteorological Organization (WMO).

The increase in the main greenhouse gases is mainly due to certain human activities, including the massive use of fossil fuels (coal, oil).
Greenhouse gases, such as carbon dioxide (which accounts for nearly 70% of anthropogenic greenhouse gas emissions) and methane, are not necessarily directly dangerous to humans, biological resources and ecosystems, but their emissions are at the origin of global warming, a phenomenon which has, in turn, many negative consequences for man and his environment.

In this context, the treatment of gaseous effluents, wastewater and sludge, as well as the recovery of domestic organic residues, industrial and agricultural, are of interest from a political, economic and environmental point of view. As regards the treatment of gaseous effluents, conventional processes use in particular oxidants, such as bleach. However, these oxidizing washing methods have the major disadvantage of generating in the rejects oxidation by-products themselves polluting and sometimes very strongly smelly. In addition, these oxidants are unstable and their handling is dangerous.

Concerning the valorization of domestic, industrial and agricultural organic residues, the integration of biogas in the French energy landscape allows in particular a consequent reduction of the greenhouse gases rejected. Said biogas is a fuel gas obtained by fermentation, also called methanization, of organic waste of animal or vegetable origin in the absence of oxygen, which mainly comprises methane and carbon dioxide. Since the impact on the greenhouse effect of methane is 20 to 25 times greater than that of carbon dioxide, it is preferable to use biogas as a source of renewable energy rather than reject it at the atmosphere.

Recent fluctuations in the costs of importing fossil fuels, in a context of dwindling fossil fuels, have also positively influenced the renewed economic interest in energy production from biogas.

Biogas is valued in different ways. It can, after a light treatment, be upgraded near the production site to provide heat, electricity or a mixture of both (the high carbon dioxide content reduces the calorific value of the biogas, increases the costs of compression and transport and therefore limits the economic value of upgrading biogas away from the production site).

Biogas can also be purified to allow wider use. In particular, the biogas can be subjected to a purification and increase its methane content (in particular by removal of CO2) to produce a gas comparable to natural gas. The biogas thus purified and enriched is called biomethane, and has a calorific value equivalent to that of natural gas.

The purified biogas is also the precursor of the biohydrogen obtained by steam cracking. Indeed, the research of the last ten years on the subject have highlighted the disadvantages of VOCs and in some cases siloxanes, present in biogas, on the conduct of energy exploitation facilities.

Whatever the recovery method used, the presence of these compounds at concentrations of the order of a few ppm constitutes a risk of premature degradation of the installations, as well as a depreciation of the energy recovery yields of the biogas. For example, in the case of using biogas as a motor fuel, it is necessary to remove the siloxane compounds because, oxidized at high temperatures, the siloxanes form silica deposits that can seriously damage the equipment.

It has now been developed and patented PTC System, a method of purifying gaseous compositions, liquid or aerosol form advantageously to overcome the aforementioned drawbacks.


What is the technology of this new patent ?

Innovation is based on the use of an original formulation, without oxidant, which acts on the pollutant by transforming it into bio-available organic compound. This formulation is based on a well known molecule used in chemistry since the 19th century for the synthesis of various specialties. The use of this molecule in the areas we are interested in is the key to the process which represents a very important advance in technical and economic terms.

The P.T.C. system is a newly patented technology for the purification of gaseous, liquid or vesicular aerosols containing pollutants harmful to health and the environment or simply malodorous.

  • The pollutants are Volatile Inorganic Compounds (CIV)
    • CO2, COS, NOx, halogenohydric acids, H2S, SO2, SOCl2, SO2Cl2, etc...
  • The pollutants are Functional Volatile Organic Compounds (COV)
    • amine, amide, nitrile, aldéhyde, cétone, ester, carboxylic acid, alcool, thiol, disulfide, thioester, halogenated organic compounds, phosgene and hydrocyanic acid, etc.

This innovative "One-pot" process consists in capturing gaseous pollutants in a physicochemical treatment whose liquid effluents are subsequently digested by the aerobic bio-purification process in the treatment plant.

(A)    Simultaneous process of absorption (capture) and organic chemical modification of Functional Volatile Compounds
(organic and inorganic).

This operation is carried out in a single operation on a collection installation by physicochemical washing..

(B)   The final destruction of capture products after the simultaneous chemical uptake and modification process
This ultimate operation (B) is carried out in a biological treatment plant. The organic compounds present and formed
During the condensation reaction are digested by the process of natural aerobic bio-purification of the purification plant.

The originality of the process resides firstly in the choice of the reagent which combines with the pollutants to be treated and secondly in the final natural destruction in the wastewater treatment plant, which does not generate any new gaseous pollution.

This purification system is unique in its design and applications. It makes it possible to distinguish itself from the competition and to improve the productivity of the collection / treatment installations, as much as its economic balance sheet is advantageous.

The new patent takes up the existing patent of the DAVID process (Process for the purification of gaseous or liquid effluents containing sulfur derivatives) for which it constitutes an improvement.

PTC System is therefore part of this new concept of Sustainable Development for the purification of biogas.

In a period particularly conducive to the development of alternative energies to fossil fuels, the prospect of integrating bio-energies into the French energy landscape is of interest from a political, economic and environmental point of view.

In fact, the valorization of domestic, industrial and agricultural organic residues or the treatment of wastewater meet the notions of sustainable development and renewable energy, clearly explained in recent international agreements and commitments.

The environmental impact of the implementation of biogas recovery channels results in a significant reduction in the greenhouse gas emissions.

Recent fluctuations in the costs of importing fossil fuels have also positively influenced the renewed economic interest in energy production from biogas, whether directly in the form of high purity methane gas. or in the form of electricity.

Anaerobic digestion and biogas upgrading with PTC System


The valorization of biogas
Consisting mainly of methane and carbon dioxide, the biogas is efficiently recovered in biomethane by purification processes.
This technique, called anaerobic digestion, is caused in digesters, during the treatment of household waste, industrial or agricultural waste and sewage sludge.
Biogas, resulting from the fermentation of this waste, is a source of renewable energy that after purification can replace natural gas of fossil origin.
Farmers, industrialists and local authorities thus treat their waste while enhancing their energy and economic potential. The GASWASH purification solution enables the valorization of all biogas for injection into the natural gas network, the production of vehicle fuel (gaseous or liquid biomethane) or the production of renewable hydrogen after reforming the biomethane.

Advanced purification technology using the GASWASH technique
In order to transform biogas into a substitute for natural gas, it must be rid of all pollutants.
The GASWASH process offers a technical solution that today allows biogas producers to use it effectively in biomethane through its purification process.
The technology used makes it possible to eliminate carbon dioxide (recyclable CO2) sustainably, and to eliminate in the same operation N2, O2, H2O, H2S, NH3, siloxanes, organochlorines or organofluorines.

The hydrogen sector, based on anaerobic digestion, should logically find its place in the near future.

The GASWASH process allows a biomethane production cost that is 3 times cheaper than the competition and therefore reduces the cost difference between fossil-based methane and biomethane for incorporation into the network. On the other hand, the GASWASH process technology allows extremely simple biogas purification equipment whose investment cost is incommensurate with the currently existing processes.

The advantages of this new technology

The capture and purification by this process, applies as well in the case of pure gases, that in mixture between them. This process applies to all the volatile functional or volatile organic volatile compounds encountered in chemistry and which are captured in the gas washing reaction medium.
On the other hand, neutral substances (air, nitrogen, biogas, natural gas, methane, butane, propane, etc.) are not captured but purified The PTC System, from which the GASWASH process is derived, has a selective character with respect to these substances, but it is universal with respect to chemical compounds comprising conventional polluting functions. (Read more)

This system is currently the only known to permanently eliminate CO2 and can be recycled in the industrial sector . Each m 3 of biogas from anaerobic digestion was used to prevent the release into the atmosphere of 2.3 kg of carbon dioxide (CO2) responsible for global warming.

However, it must be borne in mind that each m 3 of biogas produced always contains between 20 and 40% of CO 2, ie between 3 kg and 6 kg which are finally released into the atmosphere, or during biomethane purification. by competing techniques, either in the use of biogas without purification. An anaerobic digestion unit of 2 MW electricity, by the principle of methanisation, thus makes it possible to avoid the emission of approximately 9,000 t CO2 in the atmosphere.
It should be noted that this same methanisation unit of 2 MW, which consumed about 4 Mm3 of biogas, still emitted between 800 and 1,600 t of CO2 in the atmosphere depending on the nature of the methanised substances.

This new technology obtained an utility certificate early in 2017

This new PTC System technology falls into two main areas:

Industry & Odors

    • Sector of petrochemical industry,
    • Sector of refining,
    • Sector of Iron and steel industry, foundries,
    • Sector Oil and Gas Waste Processing Industries,
    • Sector of mineral chemical industries: production of sulfuricacid and titanium oxide,
    • Sector of organic chemistry,
    • Sector of Fine Chemicals,
    • Sector paper industries,
    • Sector agro-food industries,
    • Sector materials industries,


See an application of gaseous emissions
(VIC and VOC)


Sustainable Development

    • Sector of urban and industrial sewage treatment plant,
    • Sector of bio-deodorization units,
    • Sector of agricultural methanisation units,
    • Sector of the methanisation units of STEP,
    • Sector of designers and manufacturers of gas washing columns,
    • Sector of designers and builders of sewage treatment plants,
    • Sector of designers and manufacturers of methanisation units,
    • Sector of territorial bodies (region, département, agglomerations, communities of communes and communes)
    • Sector of small units of industrial sewage treatment plants,

See an application of biogas purification



The sustainable phase-out of pollutants



The sheet for the calculation of pollutants


See what are the benefits of this new technology ?


More on P.T.C. System



Sustainable development

Biogas & Biomethane

To write to me


Les Bio-énergies


Le Bio-méthane

Le Bio-hydrogène


Méthanisation en STEP

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