EARTH

[1901-09-01] Evaluation of the Inhibition Kinetics of As (III) on Nitritation by two different measurements

○Chengshan Duan¹, Cheng Yu¹, Yuxia Song¹, Lin Zhang¹, Peng Liu¹, Chongjian Tang^1,2, Liyuan Chai^1,2 (1. Central South University, 2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution)

Chairman：Naoki Hiroyoshi（Hokkaido University）

Keywords:Partial nitrification, As(III), inhibition kinetics

In this studies, two different methods, i.e. SOUR (specific oxygen uptake rate) and SNPR (specific nitrite production rate) have been applied to evaluate the inhibition kinetics of As(III) on nitritation.The inhibition kinetics of As(III) on short-cut nitrification was studied by batch experiments.For SOUR,the IC₅ was 83.78mg/L,The SOUR was reduced.With the NO₂^--N characterization,the IC₅ was 86.56mg/L,the maximum SNPR increased from the original 1.58mgNO₂^--N/(g vss/h) to 1.29mgNO₂^--N/(g vss/h), the overall trend was the same as DO.