Chromium(VI) inhibition in multi-substrate carbon oxidation and nitrification process in an upflow packed bed biofilm reactor

Novel modeling concept for evaluating the effects of cadmium and copper on heterotrophic growth and lysis rates in activated sludge process

“…When pH, dissolved oxygen and the alkalinity vary, metal speciation reveal different in toxic effects due to different speciation including oxides, hydroxides or carbonates. Due to the fact that the quality of industrial wastewater is complex, metal speciation was ignored in previous studies [8][9][10].…”

“…Several types of inhibition kinetic equations have been proposed [8][9][10]. Beg et al [8] pointed out that the degree of inhibition is unaffected by the concentration of substrate when using noncompetitive inhibitory equation.…”

“…Beg et al [8] pointed out that the degree of inhibition is unaffected by the concentration of substrate when using noncompetitive inhibitory equation. Further, the inhibitor does not prevent the enzyme-inhibitor complex from reacting with the substrate.…”

“…Further, the inhibitor does not prevent the enzyme-inhibitor complex from reacting with the substrate. Beg et al [8] chose non-competitive inhibitory equation to simulate the inhibition effect of chromium (VI) in multi-substrate carbon oxidation and nitrification process in an upflow packed bed biofilm reactor. Additionally, most inhibition terms in ASM2d or TWEA1 were the non-competitive inhibitory kinetics, so the noncompetitive inhibitory equation was also chosen to express the inhibitory behavior of X H in this study.…”

“…growth rate and lysis rate. Although the toxicity of heavy metals to ASP has been studied in numerous works, the main concerns are related to the effect of heavy metal on growth rate constant in most works [7][8][9][10][11][12]. Contrarily, no research has been done on the effect of heavy metals on lysis rate constant.…”