Filtern
Dokumenttyp
Referierte Publikation
- nein (15)
Schlagworte
- Coal fires (3)
- Bioavailability (1)
- Brandlöschung (1)
- Coal mineralogy (1)
- Coal petrography (1)
- Fire fighting (1)
- Fire propagation (1)
- Gas emissions (1)
- Heat pipes (1)
- Heavy metals (1)
Eingeladener Vortrag
- nein (5)
Sewage sludge ashes (SSA) contain considerable mass fractions of phosphorus (5-10 w-% P) suitable for fertiliser production. Unfortunately, also most of the heavy metals remain in the ashes. A thermochemical process was developed for the treatment of SSA to i) remove heavy metals and ii) transform phosphates into bio-available mineral phases. The technology was already demonstrated in technical scale (capacity of 300 kg/h) and the company OUTOTEC is currently planning the first industrial plant. In order to manufacture a marketable multi-nutrient fertiliser from the thermochemically treated SSA further wastes and industrial by-products were taken into account. Ammonium sulphate occurs as a by-product of the caprolactam production and was chosen as N-carrier (21 w-% N). Straw ash was tested as potassium carrier (11-15 w-% K). Granulation campaigns were carried out with intensive mixers in lab-, medium-and technical scale. NPS-and NPKS-fertilisers were produced that were characterised by suitable particle size distributions and strength.