Dehydrogenase activity in sewage sludge treated with different sources of cadmium
(0) Pollutants present in sewage sludge, like heavy metals, affect its biological characteristics and also sol biological characteristics. The objective of this work was to evaluate the effect of the contamination of sewage sludge with different sources of Cd on the waste dehydrogenase activity. Sewage sludge was treated with four sources of Cd CdCl<,2>, CdSO<,4>, Cd(NO<,3>)<,2> and metallic Cd to get 60mg· kg<-1> (dry basis) and incubated for 58 days. Immediately after Cd incorporation (time 0) and after 7, 14, 21, 28, 35, 43 and 58 days after incubation started, waste samples were analyzed for dehydogenase activity. At the end of the experiment Cd extracted by Mehlich I extractor was determined. The data permitted us to conclude that high concentrations of Cd, causing by the addition of different sources of the metal causes decrease in the enzyme activity depending on the Cd solubilization, but that low concentrations may be an activator of the enzyme.
enzyme heavy metals biosolid waste residue pollution biological activity
W. J. Melo E. F. F. Junior E. R. Mouta A. C. T. P. Guedes L. R. Oliveira G. M. P. Melo V. P. Melo
Laboratory of giogeochemistry, Department of Technology, State University of S o Paulo, Jaboticabal-SP, Brazil, CEP 14884-900
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
95-96
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）