Landfilling

Basic investigations into the thickstock procedure using toxic chemical wastes, particularly filter ash from waste incineration plants, in salt rock

As a basis for the further development of the thickstock procedure, a wide range of investigative results have been collated and documented for the purposes of this project. Particular attention has been paid to the composition of filter ashes, and to the flow properties and stabilisation behaviour of suspensions of these ashes.

Summary

Germany produces some 50 million Mg of municipal waste each year.  Around a quarter of this waste is burned in waste incineration plants.  The organic constituents of waste are destroyed by combustion.  However, a potentially toxic chemical content remains in the form of heavy metals in combustion residues.

If contaminated filter dusts are to be used as backfill in salt mine workings, the excavations concerned must be filled as completely and as stably as possible.  The “thickstock procedure” is available as an option for the transport and deposition of wastes.  The core element of this hydraulic process is the treatment of wastes to be used as backfill with a carrier fluid and a bonding agent.

The object of this project was the more detailed analysis of materials produced by flue gas scrubbing, in order to establish a reliable basis for the thickstock procedure.

Results:

  • In the course of investigations conducted, residues from the flue gas scrubbing installations of waste incineration plants have been analysed and their characteristics recorded.
  • Particular attention has been paid to compounds of heavy metals.
  • The flow properties and stabilisation behaviour of suspensions of waste incineration plant ash have been subject to analysis, initially in the laboratory and thereafter in situ in a mining excavation.

The method applied and the results of specific analyses conducted are described in detail in the research report, which runs to just under 600 pages.

Project Participants

Implementing Institutions

Otto-von-Guericke-University Magdeburg, Institute of Fluid Dynamics and Thermodynamics (ISUT)

Cooperation Partner

Kali und Salz Entsorgung GmbH

Institut für Baustoff- und Umweltschutztechnologie GmbH, Weimar

More Project Information

Project title: Basic investigations into the thickstock procedure using toxic chemical wastes, particularly filter ash from waste incineration plants, in salt rock

Project number: 02C0486/7

Project period: 1997 - 2000

Project region: Germany (Saxony-Anhalt)

Project contact:

Prof. Dr.-Ing. Dr. h.c. Hans Joachim Kecke
This email address is being protected from spambots. You need JavaScript enabled to view it.
++ 49/391/67-18569
++ 49/391/67-12840

View Publication

Source: German National Library of Science and Technology Hannover (TIB)