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Use of waste with specific sorption properties.

Use the proposed wastes with specific sorption properties in
process stabilisation of dangerous waste elements.
processing/optimising of waste stabilisation methodology
using the encapsulation process and chemical sorption.

The project's subject is research, development and optimization of the technology for the use of waste with specific sorption properties in the process of stabilisation of contaminants in dangerous wastes using the method of encapsulation and chemical sorption. The project is focused on the use of power or heating plant fly ash or other wastes with specific sorption properties. Quite a substantial amount of wastes with specific sorption properties are produced in the power industry and other industrial branches in the CZECH REPUBLIC. Large portions of these wastes currently end up in landfills and they are not further utilised or the use of such waste is very limited. These wastes, though, have specific physical or chemical properties that can be utilised in the processes of physical and chemical sorption. Pursuant to the valid legislation of the CZECH REPUBLIC (zakon o odpadech e. 125/97 a vyhlaska MZP e. 338/97 Sb. o podrobnostech nakladani s odpady) - /Wastes Act no. 125/97 Coll. and a Regulation of the MINISTRY OF THE ENVIRONMENT on details concerning the waste management/ selected sorts of dangerous wastes and wastes containing concentrations of harmful substances exceeding the limit (limits pursuant to the Enclosure no. 5 of the Regulation of the MINISTRY OF THE ENVIRONMENT no. 338/97 Coll. must be treated to limit the mobility of the harmful substances before they are finally neutralised by stabilisation. Generally speaking, stabilisation is understood as such waste treatment that causes changes to its physical and chemical properties by fixing the dangerous waste elements. This means that the harmful substances contained in wastes are transformed into low-toxic, non-toxic or insoluble substances and thereby the negative effect on the environment is eliminated. The most common and thanks to its universal nature, the most frequently used method of dangerous elements stabilisation is currently the so called solidification method functioning on the principle of physico-chemical sorption of harmful substances by suitable sorption materials. Thanks to their price, cement, lime or soluble glass are currently some of the most frequently used sorption materials. Each year, approximately 25,000 thousand tons of wastes are stabilised by this method in the CZECH REPUBLIC. Some 9,000 tons of sorption materials (cement, lime, soluble glass) are used in this process. Due to the input materials (cement, lime, soluble glass) the stabilisation process is very expensive (input materials costs amount to 1500 - 2500 CZK/ton of waste). Furthermore, these materials (cement, lime, soluble glass) end up on landfills together with the stabilised waste. This means that landfills are being filled with construction materials, which is not desirable from the environmental point of view. It is, therefore, necessary to seek an economically and environmentally suitable solution to this problem. Both economically and environmentally suitable materials for waste stabilisation seem to be waste materials produced in the power and chemical industries that could substitute currently used materials. The cost of such waste materials is close to zero. Fly ash produced in power or heating plants is among the cheapest and are available in sufficient quantities. The production of fly ash in the CZECH REPUBLIC is approximately 10 million m3 per year. Only a part of this material is being used in the building industry. The remaining quantities are stored for further recultivation in mud setting ponds. Other suitable additive to the stabilisation process can be lime waste with residual calcium oxide. It is caustic lime mud wastes such as waste sulphate or carbide lime with active calcium oxide. The project subject will be preparation and optimisation of generally applicable methodology for the use of waste materials in the process of hazardous wastes stabilisation. The main purpose will be to conduct laboratory and pilot operation testing of the wastes harmful substances stabilisation by means of waste heating plant fly ash or lime wastes as well as to optimize the process. On the basis of laboratory and pilot operation tests a mobile line for waste stabilisation will be designed. Condition of the economic and ecological operation is a project of waste material utilisation for stabilisation in the selected regions in the CZECH REPUBLIC. The number of technical, organisational and logistic issues will have to be solved in relationship with the proposal of stabilisation methodology and technological line design. These issues are connected to the changes of input materials properties (fly ash, waste sulphate lime, lime wastes) as well as the changed properties of the stabilised wastes (humidity, chemical composition, contents of harmful substances, etc.). It will, therefore, be necessary to prepare generally applicable stabilisation methodologies according to the input parameters of both wastes and alternative stabilisation materials. Stabilisation line design will correspond to the prepared methodologies. Keywords: wastes, ash, environment.
Acronym: 
WASTE STAB
Project ID: 
2 729
Start date: 
01-02-2002
Project Duration: 
45months
Project costs: 
720 000.00€
Technological Area: 
Land and Sea Disposal
Market Area: 

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