Improvement of the activity of anammox bacteria using graphene oxide
HUANG Shuo1, YU De-shuang1, CHEN Guang-hui1,2, WANG Xiao-xia1, LU Ting-ting1, TANG Peng1, LIU Cheng-cheng1
1. School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China;
2. National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China
Graphene oxide (GO) was used to enhance denitrification performance of anammox bacteria. Batch experiments were executed to explore effect of GO on anammox bacteria. The results showed anammox bacteria had the best nitrogen removal performance when the concentration of GO was 0.15g/L, and the total nitrogen removal rate was 18.6% higher than blank group. When GO concentration reached 0.2g/L, anammox bacteria activity was inhibited, and the total nitrogen removal rate was reduced by 26.0% compare with the blank group. A long-term experiment was operated to ident the effect of GO on anammox bacteria by set control group. The results showed the average total nitrogen removal rate of the R2 reactor with GO was 85.3%, 83.2% and 81.1% and 80.8%, respectively, which was higher than the R1reactor without GO. The kinetics characteristics of nitrogen removal in a single cycle of the R2 reactor were evaluated. The modified Boltzmann and Gompertz model were found to be the appropriate models to describe the denitrification performance of the R2 reactor in a single cycle. Moreover, the formula to predict the total nitrogen effluent concentration and removal rate at any time in the cycle was obtained.
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