Inter-Engineering © Dipl.-Ing. Frank J. Riedel - Pontarlierstraße 9 - D-78048 VS-Villingen


History of BioTech-Process

The BioTech Technology has been implemented for the first time in 1995 by shifting an abandoned sewage treatment plant into a waste plant, assisted with funds from the German Ministry for Environment.

In the meantime 19 reference plants are in operation in Germany, but also in Europe and abroad, which may be visited in operation.

For tests with specific waste from a certain municipality or client a pilot plant is available.

The BioTech Process

Waste is delivered by truck into the preparation building. This building is equipped with exhaust fans and bio-filters, which assure that no smells escape into the environment.

By pay loader the waste is fed to a bag opening crusher and subsequently to a special disc-screening station which separates the material at about 80 mm particle size. The material > 80 mm contains practically no organic material while the small fraction contains the majority of the organics but still about 20% of inerts.

The fine fraction is transported via magnetic metal separator into the dissolving tank (suspenser). Water is added and by imposing high shearing forces, the organic material is desintegrated down to fibre size, thus forming a pasty slurry, while plastics and other inert material remains practically unaffected.

This allows in a very elegant manner the separation from the suspension by screeing and sedimentation.

The remaining slurry, now practically pure organic material, is pumped into the fermentation tank (digester) for anaerobic fermentation.   Within 15 – 20 days under specific conditions of pressure and temperature and with the assistance of methanogenic bacteria about 50% of the organics are transformed into biogas, while the remaining 50% is stabilised as valuable, clean and uncontaminated compost material.

The generated biogas will be converted into electricity in a motor-generator set.

The liquid fraction of the slurry is dewatered thus forming the compost substrate.

The separated water will be recirculated and reused for dissolving of fresh waste.

Waste to energy - Waste to high quality fertiliser - Waste will generate income and profit

Vorteile des BioTech-Verfahrens

Lowest waste treatment costs of any technology, around 10 – 20 Euro/t

Treatment of mixed, unsegregated municipal waste without pre-sorting

Easily marketable by-products electricity and high quality compost fertiliser

Waste reduction to 20 – 25% of original input volume

No emission technology, no smell, no noise, no leachate

Low land requirement

Possibility for treatment of a large variety of organic wastes such as:

   agricultural waste (manure and solid waste)

   slaughter house waste

   kitchen waste

   industrial waste from food and canning industries

   garden waste and tree clippings

Entsorgungs-Möglichkeit für praktisch alle organischen Abfall-Stoffe wie

-  landwirtschaftliche Abfälle (Gülle und Mist)

-  Schlachthof-Abfälle

-  Küchenabfälle

-  Abfälle aus der Konserven- und Lebensmittel-Industrie

-  Garten - Abfälle und Baumschnitt