Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Two streams of plasma system technology

The project originality was to identify of two independent waste stream types that can be treated with plasma simultaneously to receive non-toxic, friendly to environment and added value product.

The waste streams were:
- Inorganic materials i.e. waste materials composed almost entirely of inorganic substances, such as medical & industrial waste incineration residues: ash, filtration deposits and sediments.

- Organic materials, i.e. hazardous fluid/solid chemical wastes: polychlorinated biphenyls (PCB`s), oil-solid mixed wastes (filters), pesticides, spend chemical reagents etc.

The plasma treatment and computer simulation exercise has been demonstrated mainly for medical ash representing inorganic stream and PCB’s containing transformer oil representing organic hazardous waste stream.

The interesting conclusion of this research was that the main solid component - carbon converts into silicon carbide SiC above certain temperature. The SiC amount increases nearly linearly with the increase of the organic admixture. This increases the product hardness. The conversion temperature matches well the range of smelting process temperatures.

In the range of temperature 1000 - 3000K the off gas is rich in hydrogen. Carbon monoxide together with hydrogen creates the most caloric off gas in the 2100-2400K temperature range. The total amount of this off gas depends on the quantity of PCB-oil in the hospital ash.

To get the melt of the same viscosity value higher operating temperature is needed for moist ash compared to the dry one. The higher the amount of oil added the lower the operating temperature required for smelting. Generally in the pyrolysis conditions the more oil added the more energy is required.

The development of plasma technology for inorganic wastes is well established and in widespread commercial use but for organic wastes it is an emerging technology with enormous potential application.

Informations connexes

Reported by

Technical University of Lodz (TUL)
Stefanowskiego 4/10
90-924 Lodz
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