Keywords: 
• respiration rate /
• inhibition kinetics /
• inhibition kinetic constant /
• activated sludge

Abstract: In this article, through theoretical analysis about respiration rate of different inhibition in activated sludge process, different kinds of measurement methods of inhibition kinetic constant on different inhibition are put forward based on respiration rate. The inhibition kinetic constant of product inhibition and KS is get through the line fitting. The line, of which the slope and interception is 1/K′P and KS respectively, is constructed with the known starting concentration of substrate and the curve of respiration rate. In the course of solution of substrate inhibition constant, the substrate concentration on the maximum of respiration rate is calculated firstly and the kinetic constant of substrate inhibition is solved through the relation equation on the maximum of respiration rate. The inhibition kinetic constant about competitive and non-competitive inhibition is figured out by calculating the substrate concentration on the same speed point. The another way of non-competitive inhibition is the ratio method of maximal respiration rate. At the same time, inhibition kinetic constant of noncompetitive inhibition is testified by force of a experiment. Finally, the inhibition kinetic constant of NaCl inhibition on degradation of glucose is 20.2 g/L,or 0.02KS which are calculated by the three different methods.