Morphological and Mineralogical Analysis of Alluvial-Meadow Soils (Fluvisols) from the Region of Sofia Wastewater Treatment Plant (WWTP)

“N. Poushkarov” Institute of Soil Science, BG - 1080 Sofia, Bulgaria


TEOHAROV, M. and I. ATANASSOVA, 2006. Morphological and mineralogical analysis of alluvial-meadow soils (fluvisols) from the region of Sofia wastewater treatment plant (WWTP). Bulg. J. Agric. Sci., 12: 789-796

The present study includes morphological and mineralogical analysis of Gleyic-Eutric (Fluvisols) from the region of Sofia wastewater treatment plant advanced by sewage’s sludge’s deposition. The investigation shows that the soil aggregates of the surface horizons have become unsteady and easy to disintegrate. In the lower parts of the profiles the formation of structural aggregates was low. In the horizons underlying the sludge layers and susceptible to the sludge influence, the processes of organic residue deposition and the root system development have been terminated due to the toxic effect of the sludge contained pollutants. The clay mineralogical fraction derived from the respective horizons was dominated by smectite (> 60% almost in all the soils studied).

Key words: Fluvisols, morphological and mineralogical properties, wasterwaters, sludges, pollutants