Heavy Metals Transport in the Soil Profiles under the Application of Sludge and Wastewater

Heavy metal transfer in soil profiles is a major environmental concern because even slow transport through the soil may eventually lead to deterioration of groundwater quality. The use of sewage sludge and effluents from wastewater treatment plants for irrigation of agricultural lands is on the rise particularly in peri-urban area of developing countries. In this study soil samples under sludge application and wastewater irrigation were studied and soil samples were collected in the soil profiles from the surface to 100 cm in depth. For this purpose, three plots were made in a treatment plant in south of Tehran-Iran. First plot was irrigated just with effluent from wastewater treatment plant, second plot with simulated heavy metals concentration equal 50 years irrigation and in third plot sewage sludge and effluent was used. Trace metals concentration (Cd, Cu) were determined for soil samples. The results indicate movement of metals was observed, but the most concentration of metals was found in topsoil samples. The most of Cadmium concentration was measured in the topsoil of plot 3, 4.5mg/kg and Maximum cadmium movement was observed in 0-20 cm. The most concentration of copper was 27.76mg/kg, and maximum percolation in 0-20 cm. Metals (Cd, Cu) were measured in leached water. Preferential flow and metal complexation with soluble organic apparently allow leaching of heavy metals.

Authors:

• A. Behbahaninia
• S. A. Mirbagheri
• A. H. Javid

Keywords:

• Heavy metal
• sludge
• soil
• transport.

References:

[1] V.J.Camobrccoo, B.K.Richards, T.S.Steenhuis, J.H.Peverly, "Movement
of heavy metals through undisturbed and homogenized soil columns.161
(11):740-750, 1996.
[2] B.K Richars, T. S. Steenhuis, J. H. peverly and M.B Mcbride, "Metal
mobility at an old heavily loaded sludge application site" Environmental
pollution J., vol .99,pp.365-377,1998.
[3] B. Alloway, A.Jackson, "The behavior of heavy metals in sewage
sludge-amended soil," Sci. Total Environ J., vol.100, pp.151-176, 1991.
[4] R. Gerritse, et al,"Effect of sewage sludge on trace element mobility in
soils,"Environ. Qual. J.Vol11pp.359-364.
[5] E. Epstain, "Effect of sewage sludge on some soil physical properties,"
Environ.Qual J., Vol.4, pp.139-142, 1975.
[6] H. Zhang and H. M. Selim, "Modeling the transport and retention of
Arsenic in soils," Soil Sci.Soc.Am.J., vol.70, pp1677-1687, August.
2006.
[7] A. Chang et al., "accumulation of heavy metals in sewage sludge -
treated soils" Environ Qual J. vol. 13, pp.87-90, 1984.
[8] R. Salmasi, A. Tavasoli," Pollution of south of Tehran ground waters
with heavy metals," Int. J. Environ. Sci. Tech. , Vol. 3, No. 2, pp. 147-
152, Spring 2006.
[9] Van Erp, "long term heavy metal leaching from soils, sewage sludge and
soil sewage mixtures"Environ. Sci.Technol. vol.25, pp.706-711, 1991.