Sorption of cadmium in soil treated by limed sewage sludges
1999
Balik, J. | Tlustos, P. | Szakova, J. | Blahnik, R. | Kaewrahun, S. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
The aim of the trials was to determine changes in sorption of Cd in soil after application of limed and untreated sewage sludges. Three different sewage sludges incubated in advance for eight months at the temperature 20 deg C were used. The rate was 180 g per 1 kg of sludge dry matter. After application of CaCO3 pH of sludges increased to almost neutral value. In untreated sludges the following Cd concentration was determined: sludge 1=5.10 mg Cd.kg/l, sludge 2=7.08 mg Cd.kg/l, sludge 3=1.96 mg Cd.kg/l. When CaCO3 was applied, the total Cd content was diluted and after analysis the following values were found: sludge 1+v=5.09 mg Cd.kg/l, sludge 2+v=6.56 mg Cd.kg/l, sludge 3+v=1.59 mg Cd.kg/l. Liming of sludges resulted in significant decrease of water-soluble and exchangeable forms of Cd in sludges.
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