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Effect of Ce~(3+) on Volatile Fatty Acid Concentrations During Anaerobic Granular Sludge Digestion

LIANG Rui~1,XIA Qing~1,DING Li-li~1,SHI Xiao-lei~1,ZHAO Ming-yu~2,REN Hong-qiang~1(1.State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University,Nanjing 210093,China;2.Grandway Technology International Co.Ltd.,Beijing 100102,China)  
Batch experiments were conducted to investigate the effect of Ce~(3+) on volatile fatty acid(VFA) concentrations by anaerobic granular sludge digestion using D-Glucose and acetic sodium as substrate in the state of stabilization and restart-up.Results show that when the concentration of Ce~(3+) is lower than 1 (mg/L),VFA concentration decreases,which suggests the transformation of butyric acid to acetic acid and acetic acid to methane is promoted.When the concentration of Ce~(3+) is 1-10(mg/L),the bacterial activity decreases and decomposition of the acetic acid and butyric acid becomes more difficult compared with the control.Adding Ce~(3+) brings little change in the constitution of VFA: 96% of VFA is acetic acid and butyric acid,while the propionic acid accounts for less than 3%.With the acetic sodium as the sole carbon and energy source,adding 0.05(mg/L) Ce~(3+) could accelerate acetate degradation.After being conserved for 4 months,the activity of the Ce-containing anaerobic granular sludge is higher than that of the Ce-free sludge.The present of Ce contributes to the restart-up of anaerobic reactors.
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