This research is focused on the kinetic model to enhance the hydrogen effectiveness in hydrogenotrophic denitrification (HD) with carrier materials. The modified two steps of Michaelis-Mention model were developed under two substrates limitation in batch test (initial nitrate and nitrite of 40-160 mg-N/L). The estimate values of the maximum specific growth rate, yield coefficient and half saturation constant were 0.0056 h~(-1), 19.22 mg/L and 1.44 mg-VS/mg-N for nitrate and 0.0032 h~(-1), 18.51 mg/L and 0.67 mg-VS/mg-N for nitrite, respectively. The maximum hydrogen gas capacity per biomass concentration was investigated and approximately 3.5 g-VS/1 g of H_2 gas was found in batch test. These above data were used to develop the modified model in continuous feeding (40 mg-N/L of nitrate) in the simple HD reactor with biologically carrier material. The modified continuous feed model was correlated with experimental data and useful for controlling the HD performance under lowest energy demand prediction. The system performance from lab-scale was shown to achieve exceptional nitrogen removal performance of 145.50 g/m~3/d with the highest hydrogen effectiveness of 454.70 mg-H_2/g-N.
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