Mathematische Simulation von Sediment- und Bodenaufbereitungsanlagen

On the basis of mathematical models for separation units (sieves, hydrocyclones, upstream-classifiers etc.), frequently used in plants for the mechanical/physical treatment of contaminated soils and sediments, a simulation program was developed in order to estimate the separation efficiency of soil and sediment treatment plants. The simulation results may be used to evaluate commercially available treatment plants in dependence of the properties of different input materials. Simulating the treatment of different soils and sediments allows the estimation of the amount of (side) product streams and the required deposit capacities. The program consists of a kernel, describing the separation units mathematically and a graphical user interface. As user interface the Windows conform surface of the program WinErs32, developed by Ingenieurbuero Dr.-Ing. Schoop, has been used. (orig.)Available from TIB Hannover: RA 3251(98/E/23) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Remediation of sediment fractions by the ASRA "t"r"a"d"e"m"a"r"k -DEMI-process A new mechanical physical treatment technology for contaminated silt

Soils and sediments are conventionally treated by washing processes. Water and energy as well as tensides and additives are used to separate contaminants from the raw material. Regarding technical and economical aspects the separation is possible for sands containing small amounts of silt. Silt fractions remain as a highly contaminated rest which has to be stored on a waste disposal site. The main characteristics of the new process patented by G. Kupczik are: - a pump system which treats the suspension by high energy impact under partly cavitating conditions and - a special spraying process in the following separation step. Completion of an existing plant (ASRA "t"r"a"d"e"m"a"r"k) by a special spraying and sedimentation unit (DEMI-process) led to very enthusiastic results regarding the degree of separation between organic and mineral particles. Thus additional mineral fractions may be gathered for industrial use. The operational background of the process is investigated in a separate pilot plant at GKSS. Scientific investigations are performed in a model plant mainly consisting of a cavitation unit and a spraying unit in order to work out the theoretical background for a subsequent scale up of the new process. Actual R and D-results of the test phase will be reported. (orig.)Available from TIB Hannover: RA 3251(98/E/26) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman