Abstract
Aim of the present paper is to give a contribution for a better understanding of the mechanism of magnesium accumulation by cells of Sphaerotilus natans. The results presented in this paper seem to confirm the non strictly biological nature of the phenomenon. An inhibiting effect of ethanol on the uptake is also evidenced and a hypothesis for the inhibition mechanism, implying the simultaneous occurrence of both physical and biological phenomena, is presented. In the presence of ethanol a film around the cell membrane is likely to be produced, partially preventing the adhesion of magnesium ions on the wall; subsequently, ethanol would be transformed into acetic acid and magnesium removed from the cell wall as a salt. All the efforts to improve the process yields and the resistance of the microorganism to ethanol, through specific adaptions, have not given the expected results.
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Abbreviations
- I kg/m3 :
-
inhibitor concentration
- t d:
-
magnesium removal time
- τ d:
-
residence time
- S f kg/m3 :
-
residual magnesium concentration corresponding toY max
- X kg/m3 :
-
biomass concentration
- Y :
-
magnesium uptake yield
- ν kg/(m3 · d):
-
magnesium uptake rate
- max :
-
maximum value
- 0 :
-
starting value
References
Converti, A.; Perego, P.; Lodi, A.; Fiorito, G.; Del Borghi, M.; Ferraiolo, G.: In-situ ethanol recovery and substrate recycling during continuous alcohol fermentation. Bioproc. Eng. (in press)
Hatch, R. T.; Menawat, A.: Biological removal and recovery of trace heavy metals. Biotechnol. Bioeng. Symp. 8 (1978) 191–203
Kuyucak, N.; Volesky, B.: Accumulation of cobalt by marine alga. Biotechnol. Bioeng. 33 (1989) 809–814
Norberg, A. B.; Persson, H.: Accumulation of heavy-metal ions by Zooglea ramigera. Biotechnol. Bioeng. 26 (1984) 233–246
Shumate, S. E. II; Strandberg, G. W.; Parrott, J. R. Jr: Biological removal of metal ions from aqueous process stream. Biotech. Bioeng. Symp. 8 (1978) 13–20
Findlay, D. M.; McLean, R. A. N.: Environ. Sci. Technol. 15 (1981) 1388
Habashi, F.: Environ. Sci. Technol. 12 (1978) 1372
Polikarpov, G. C.: Radioecology of aquatic organisms. New York: North Holland 1966
Tanaka, Y.; Skoryna, S.: Organic macromolecular binders of metal ions. Montreal, Gastrointestinal Research Laboratory, McHill University 1970
Converti, A.; Fiorito, G.; Del Borghi, M.; Ferraiolo, G.: Simultaneous hydrolysis of tri- and tetrasaccharides by industrial mixtures of glucoamylase andα-amylase: kinetics and thermodynamics. Bioproc. Eng. (in press)
Converti, A.; Perego, P.; Lodi, A.; Parisi, F.; Del Borghi, M.: A kinetic study of Saccharomyces strains: performance at high sugar concentrations. Biotechnol. Bioeng. 27 (1985) 1108–1114
APHA: Standard methods for the examination of water and wastewater, 16th edition, Washington: American Public Health Association 1985
Lafon-Lafourcade, S.: Wine and brandy. IV. Bacterial spoliage of wines, pp. 126–135. In G. Reed (Ed.) Biotechnology, Vol. 5, Weinheim: Verlag Chemie, GmbH 1983
Converti, A.; Zilli, M.; Del Borghi, M.; Ferraiolo, G.: The fluidized bed reactor in the anaerobic treatment of wine wastewater. Bioproc. Eng. 5 (1990) 49–55
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Converti, A., Fiorito, G., Zilli, M. et al. Magnesium uptake by Sphaerotilus natans. Bioprocess Engineering 7, 325–330 (1992). https://doi.org/10.1007/BF00705163
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DOI: https://doi.org/10.1007/BF00705163