The aim of the work was to determine changes of long-term sewage sludge quality stabilized in reed basins from 7-15 years. The following parameters were evaluated: dry matter and organic matter concentration, nitrogen, phosphorus, and selected heavy metal (Cd, Ni, Pb, Cr, Cu, Zn) fractions. The material for the investigations was collected from 4 reed basin systems (utilisated sewage sludge) located in conventional WWTPs in Denmark (serving from 9 000 to 40 000 pe, producing from 232 to 870 t of d.m/a). Based on the obtained results, it was found that the sludge in reed basins was dewatered and stabilized. Furthermore, it was found that the concentration of nitrogen decreased while the concentration of phosphorus increased. The analyzed heavy metals were mostly bound with the residual fraction and their concentrations were below permissible values for agricultural usage as determined by Polish law. Thus an obtained product - stabilized sewage sludge can be potentially used as fertilizer.
Authors
Additional information
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
- Language
- angielski
- Publication year
- 2008
