Investigation of Heavy Metal Removal from Ashes from the Gasification of Composted Sewage Sludge and Greenery Waste by Thermodynamic Equilibrium Calculations and Lab-Scale Tests

H. Hirt, T. Brunner & I. Obernberger
Within the EU FP7¬project ENERCOM the polygeneration of heat, electricity, compost and pellets based on sewage sludge, greenery waste and biomass residues is demonstrated. One aspect of ENERCOM is that ashes from gasification of the input materials should be added to compost in order to recycle P and other relevant plant nutrients contained in the sewage sludge. Due to the high heavy metal contents of sewage sludge and consequently of the ashes from the gasification...