Effect of Cd(II) on Different Bacterial Species Present in a Single Sludge Activated Sludge Process for Carbon and Nutrient Removal
Publication: Journal of Environmental Engineering
Volume 132, Issue 2
Abstract
Heavy metal cadmium(II) was added stepwise into an pilot plant to investigate the toxic effects of Cd(II) on the removal efficiencies, kinetic parameters (yield coefficients and maximum specific growth rates) and reaction rates of carbon, nitrogen and phosphate for the acclimatized heterotrophic and autotrophic bacteria. Results showed that Cd(II) initially affected the biological reaction of phosphate removal. At Cd(II) , the efficiencies of total nitrogen removal and nitrification were substantially dropped. At the same time, the yield coefficient and maximum specific growth rate of heterotrophs were significantly decreased from and to and , respectively. And, the denitrification rate was inhibited by about 61%. The inhibition percentages of anaerobic release, anoxic and aerobic uptake rates of phosphate were about 76, 64, and 90%, respectively. When Cd(II) concentration was continually increased up to , removal efficiency of chemical oxygen demand (COD) was significantly dropped. However, there was no obvious inhibition on the biological reactions of anaerobic ammonification.
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Published In
Journal of Environmental Engineering
Volume 132 • Issue 2 • February 2006
Pages: 173 - 180
Copyright
© ASCE.
History
Received: Aug 16, 2004
Accepted: May 10, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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