caa a22 4500 465823491 CHVBK 20180323112142.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF00166795 doi (NATIONALLICENCE)springer-10.1007/BF00166795 Mechanism of cadmium uptake by activated sludge [Elektronische Daten] [Rémy Gourdon, Emilia Rus, Shubhangi Bhende, Sam Sofer] Summary: The significance of metabolic activity in cadmium uptake by unacclimated activated sludge was studied. Below 30 mg/l cadmium in solution, biosorption was found to follow the Freundlich isotherm, which is the most common pattern for physico-chemical adsorption. More than 95% of total cadmium uptake was achieved within 5 min metal-sludge contact time. Biosorption increased strongly when the initial cadmium concentration in solution was raised from 10 to 100 mg/l, whereas in the same concentration range the metabolic activity of the sludge, as measured by respiratory activity and extracellular protein production, was very significantly inhibited. The addition of nutrients at low but significant levels failed to increase cadmium uptake in 2 h contact time, while in 24 h the addition of nutrients caused the biosorption to increase by only 5-10% without any significant growth of the biomass. Biosorption was found to increase with temperature between 5° C and 40° C, in correlation with an increase in the metabolic activity of the sludge. Pretreatment of the sludge with metabolic inhibitors (NaN3 and UV rays) appeared to cause only a very slight decrease (5-10%) of biosorption. These results suggest that metabolic uptake of cadmium was low and that adsorption to the surface of the cells was the major mechanism of uptake. Springer-Verlag, 1990 Gourdon Rémy Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut Rus Emilia Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut Bhende Shubhangi Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut Sofer Sam Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut Applied Microbiology and Biotechnology Springer-Verlag 34/2(1990-11-01), 274-278 0175-7598 34:2<274 1990 34 253 https://doi.org/10.1007/BF00166795 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00166795 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gourdon Rémy Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut NATIONALLICENCE 700 1- Rus Emilia Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut NATIONALLICENCE 700 1- Bhende Shubhangi Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut NATIONALLICENCE 700 1- Sofer Sam Biotechnology Research Group, New Jersey Institute of Technology, 07102, Newark, NJ, USA aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer-Verlag 34/2(1990-11-01), 274-278 0175-7598 34:2<274 1990 34 253 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer