Suitability of ashes for the production of earth

The report of the Federal Environment Agency investigates the possible use of ash from biomass and coal combustion plants for the production of high-quality earth, e.g. for recultivation or greening. Carbonation – the chemical reaction of calcium oxide with water and carbon dioxide to form calcium carbonate – improves the recoverability of ashes from biomass combustion. The addition of compost promotes this process and creates high-quality starting material for soiling. In compliance with the quality requirements in accordance with the Federal Waste Management Plan, only coarse bush from the incineration of untreated and pure biomass (no waste co-incineration) may be used for earthing. The use of ash from the combustion of coal is currently not recommended due to the varying quality.