Amylase activity in sewage sludge treated with different sources of cadmium
Soil contamination with heavy metals is a great environmental problem because metals persist in the environment and are toxic to microorganisms, plants and animals. So, because sewage sludge may be used as soil amendment, it is also important to know the effect of heavy metals on its chemical, biochemical and biological properties. The objective of this work was to evaluate the effect of different sources of Cd on sewage sludge amylase activity. Sewage sludge was incubated with different sources of Cd CdCl<,2>, CdSO<,4>, Cd(NO<,3>)<,2>, metallic Cd to get 60mg·kg <-1> Cd (dry basis). Sewage sludge was sampled each 7 days till 58 days and analyzed for amylase activity. Enzyme activity was not affected by the treatments. At the end of the experiment, Cd extracted from sewage sludge by Mehlich I extraction was more than 50％ of the total Cd and there was no difference among the Cd sources, but all Cd sources caused a great increase in extractable Cd.
enzyme activity biosolids heavy metals waste pollution residue
E. F. F. Junior W. J. Melo F. R. Mouta A. C. T. P. Guedes G. M. P. Melo V. P. Melo
Laboratory of biogeochemistry, Department of Technology, State University of S o Paulo, Jabotieabal-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
77-78
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）