Effects of Ni(II) on respirometric oxygen uptake |
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Authors: | M Albek ü Yeti? C F G?k?ay |
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Institution: | (1) Environmental Engineering Department, Anadolu University, Yunusemre Campus, 26470 Eskişehir, Turkey Tel.: 90 222 3350580/3631 Fax: 90 222 3353616, TR;(2) Environmental Engineering Department, Middle East Technical University, 06531 Ankara, Turkey, TR |
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Abstract: | The effects of Ni(II), substrate and initial biomass concentrations on biochemical oxygen demand (BOD) were studied by using
an electrolytic respirometer. The effects of Ni(II) (2.5, 5.0, 10.0, 25.0 mg/l) and substrate (325, 650, 1300 mg/l as chemical
oxygen demand) in a synthetic wastewater with differing initial biomass concentrations (1, 10, 100 mg/l) were investigated.
The biomass-to-metal ratio was found to be the most important parameter affecting the measured BOD values. The maximum specific
growth rates were calculated and the results of batch respirometric experiments were analysed both by graphical and statistical
methods. In statistical analyses, a factorial experimental design approach was followed and results were treated by multiple
regression techniques. A mathematical model was developed to express the maximum oxygen uptake in terms of nickel, substrate
and initial biomass concentrations and their magnitudes of their effects were compared. The biomass-to-metal ratio was found
to be very significant so that another model that expresses oxygen uptake in relation to the biomass-to-metal ratio and also
to substrate concentration was developed. Finally, the effect of Ni(II) was demonstrated to depend on both substrate and initial
biomass concentrations. This effect was stimulatory at low concentrations of Ni(II), and complete inhibition was never observed
even at the highest concentration of Ni(II) studied, which was 25.0 mg/l.
Received: 4 January 1997 / Received revision: 10 June 1997 / Accepted: 29 June 1997 |
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