Biomass relationship to growth and phosphate uptake ofPseudomonas fluorescens,Escherichia coli andAcinetobacter radioresistens in mixed liquor medium |
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Authors: | M N B Momba T E Cloete |
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Affiliation: | (1) The Environmental Biotechnology Laboratory, Department of Microbiology and Plant Pathology, University of Pretoria, 0002 Pretoria, South Africa |
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Abstract: | The ability ofPseudomonas fluorescens, Escherichia coli andAcinetobacter radioresistenns to remove phosphate during growth was related to the initial biomass as well as to growth stages and bacterial species. Phosphate was removed by these bacteria under favourable conditions as well as under unfavourable conditions of growth. Experiments showed a relationship between a high initial cell density and phosphate uptake. More phosphate was released than removed when low initial cell densities (102–105 cells ml–1) were used. At a high initial biomass concentration (108 cells ml–1), phosphate was removed during the lag phase and during logarthmic growth byP. fluorescens. Escherichia coli. at high initial biomass concentrations (107 cells ml–1), accumulated most of the phosphate during the first hour of the lag phase and/or during logarithmic growth and in some cases removed a small quantily of phosphate during the stationary growth phase.Acinetobacter radioresistens, at high initial cell densities (106, 107 cells ml–1) removed most of phosphate during the first hour of the lag phase and some phosphate during the stationary growth phase.Pseudomonas fluorescens removed phosphate more thanA. radioresistens andE. coli with specific average ranges from 3.00–28.50 mg L–1 compared to average ranges of 4.92–17.14 mg L–1 forA. radioresistens and to average ranges of 0.50–8.50 mg L–1 forE. coli. |
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Keywords: | biornass growth phosphate uptake Pseudomans fluorescens Escherichia coli Acinetobacter radioresistens |
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