172
R. Sundaram et al.
Fig. 3 Removal of nitrate in the synthetic medium under batch mode condition a Effect of carbon
sources b effect of starch concentration c effect of temperature d effect of pH e effect of cell
concentration f effect of all favourable conditions
NO 3
− . Correspondingly, Ayyasamy et al. (2007) attained 89.08% of NO 3
− reduction
in ground water amended with 1% starch by Pseudomonas sp. (RS 7).
The temperature effect on the denitrification rate is another important feature in
the design of a denitrification process (Oh and Silverstein 1999; Orhon et al. 2004).
Thermophilic and psychrophilic denitrifying bacteria are known to have different
temperature optima than the mesophiles. The bacterial consortium (KW1 and YW4)
which were mesophiles, reduced maximum percentage of NO 3
− (99.4%) in the
synthetic medium. Ayyasamy et al. (2007) reported a maximum of 89.08% of NO 3
−
at 30 °C. In the present study also, higher (99.4%) NO 3
− removal was observed at
R. Sundaram et al.
Fig. 3 Removal of nitrate in the synthetic medium under batch mode condition a Effect of carbon
sources b effect of starch concentration c effect of temperature d effect of pH e effect of cell
concentration f effect of all favourable conditions
NO 3
− . Correspondingly, Ayyasamy et al. (2007) attained 89.08% of NO 3
− reduction
in ground water amended with 1% starch by Pseudomonas sp. (RS 7).
The temperature effect on the denitrification rate is another important feature in
the design of a denitrification process (Oh and Silverstein 1999; Orhon et al. 2004).
Thermophilic and psychrophilic denitrifying bacteria are known to have different
temperature optima than the mesophiles. The bacterial consortium (KW1 and YW4)
which were mesophiles, reduced maximum percentage of NO 3
− (99.4%) in the
synthetic medium. Ayyasamy et al. (2007) reported a maximum of 89.08% of NO 3
−
at 30 °C. In the present study also, higher (99.4%) NO 3
− removal was observed at