Effects of Repeated Applications of Sewage Sludge and MSW Compost on the Bioavailability of Heavy Metals in Greenhouse Soil
B. Topcuođlu*
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Akdeniz University Vocational High School of Technical Sciences, Environmental Pollution and Control Department,
07058 Antalya, Turkey
Pol. J. Environ. Stud. 2005;14(2):217–222
In a two-year study, manure, sewage sludge and MSW compost were applied to greenhouse soil. A tomato plant was grown. Soil samples were collected after harvest and total and DTPA-extractable Zn, Cu, Ni, Pb and Cd contents of greenhouse soil were determined. Sludge and MSW compost used in a 2-year period increased both total and DTPA-extractable concentrations of Zn, Cu, Ni and Pb in the greenhouse soil. Cd increase was detected only in “total” form in the second year, by sewage sludge and MSW com-post treatments. Bioavailable Cd content of soil was found below the detection limit in all treatments. The amount of bioavailable metals in the greenhouse soil were significantly high for the sewage sludge and MSW compost treatments, almost including a 9-, 6- and 3-fold increase in Zn, Cu and Pb, respectively. Total and bioavailable metal contents of soil in sewage sludge and MSW compost applications were higher in comparison with manure application. In sewage sludge and MSW compost treatments, “total” concen-trations of all metals were found below pollutant limits, but the increase in available fractions was more marked than those of total concentrations.