TDF Ecotech AG

End products of waste management centre

Recycling of materials

Our prime goal is to recover and recycle materials to conserve valuable natural resources. Recycling means enhancing the quality of materials that have been collected and sorted and preparing them for reuse. Such materials are primarily glass, paper, cardboard, paperboard containers, iron, non-ferrous metals, and plastics. Careful management of our natural resources is vital for the survival of future generations. Reclaimed materials are sold to users and/or used by local industry.

Compost

Compost is one of the end products of biological treatment..
Depending on local conditions and client needs, three different types of compost products may be supplied:

  • Fresh compost is sanitised but not yet fully matured compost. It is offered with medium to coarse grain sizes. Fresh compost contains larger portions of easily degradable organic matter. This so-called “active humus” provides nutrients to microorganisms living in the soil. In addition, fresh compost supplies important nutrients for plant fertilisation. Fresh compost is used especially in agriculture.
  • Finished compost is sanitised and stable compost. It is offered with fine to medium grain sizes. Finished compost contains larger portions of stable humic materials. These are used as "permanent humus” for soil improvement. In addition, finished compost contains all plant nutrients needed for fertilisation. Finished compost is used mainly in horticulture and landscaping as well as in agriculture.
  • Substrate compost is finished compost with low contents of plant nutrients. It is offered with fine grain sizes. Substrate compost is used as an ingredient in mixing culture media and flower soil. This reduces the use of peat. Substrate compost is employed in horticulture and by the soil industry.

The waste management centre with its capacity to process 350,000 tons of waste per year will have an output of some 30,000 tons of compost per year.

 

RDF

Refuse-derived fuel (RDF) - is fuel that is produced by treating combustible waste. RDF is usually extracted as the so-called high-calorific fraction from household waste, bulky waste and industrial waste similar to household waste and used as a substitute for primary fuels, i.e. fossil fuels such as coal (brown coal and black coal), crude oil, natural gas, and wood. The proportions at which different types of waste are used depend on local conditions and collaboration with public or private-sector waste disposal businesses. Treatment is followed by thermal utilisation in co-combustion plants such as cement mills, for example. The principal components of RDF are 44-51% carbon (C), 29-36% oxygen (0), and 5-7% hydrogen (H). In addition, RDF includes, depending on the origin of the waste feedstock, various dense mediums and contaminants, including heavy metals. Small quantities of nitrogen, sulphur, chlorine, potassium, and sodium as well as other substances may also be present. The standards that RDF has to meet depend on the users’ requirements. On the one hand, RDF must have certain physical properties such as moisture, grain size, density (differences between fluff, pellets, or bales). On the other hand, combustion and chemical properties are specified such as calorific value, specific energy content, flash point, chemical composition such as heavy metals, halogens, carbon and hydrogen, ash contents and composition, various categories of pollutants.
Internationally, the substitution of primary fuels by secondary fuels has been state of the art for years. This trend is highly visible today in the cement industry. Cement mills use RDF in their production processes and may consume enormous amounts of RDF.

Photograph: Products ready for use by the cement industry.

Photograph: Refuse-derived fuels produced for the cement industry. These fuels must be customised to the combustion system used.
70,000 tons of RDF per year are produced at the waste management centre designed to handle 350,000 tons of waste per year.

Electric energy/heat

Our waste management centres employ the anaerobic process. One of the products of this process is high-quality biogas, which is used to generate electricity and heat. The electric power generated may be fed into the public grid. The heat produced is also utilised (for heating nearby buildings). The waste management centre designed to handle 350,000 tons per year has a potential output of 8-10 MW of electric power and thermal energy.

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