PROCESS FOR PRODUCING GRANULAR PELLETIZED GLASS MATERIAL WITH TRACE ELEMENTS, ESPECIALLY AS GROWTH SUPPORT FOR SELECTIVE NUTRIENT SUPPLY OF MICROORGANISMS AND GRANULAR PELLETIZED GLASS MATERIAL

摘要

A pelletized expanded glass material is provided, which is particularly suitable as a growth support for microorganisms, especially for use in a biogas plant or an anaerobic sewage treatment plant. The production process of the invention for the pelletized expanded glass material contains the steps of: mixing a ground glass, an expanding agent and a binder to give a starting mixture. The starting mixture is pelletized to give ground glass pellet green bodies. The ground glass pellet green bodies are foamed to give expanded glass pellet particles at temperatures of 600 to 950° C. Accordingly, especially in the production of the starting mixture, minerals and or trace elements are added, which serve especially for the nutrient supply of microorganisms used in the biogas plant or the anaerobic sewage treatment plant.