A Research on Ammonium Transformation by Activated Sludge Process with Nitrification: Experiment at Laboratory Scale

The study presents the experimental results of ammonium transformation by activated sludge process with the nitrification one. The study was carried out by using the artificial wastewater samples with C/N ratios from 5 to 10 (by mass). Carbon and nitrogen sources are taken from C6H12O6 and NH4Cl. The experiment results show that: (1) For wastewater with a C/N ratios from 5 to 10, the activated sludge process with nitrification can be applied to convert ammonium; (2) With operation loading in range of 0.33 ÷ 0.39 g COD/g MLVSS.day at pH 7 ÷ 8 and temperature at 29.8 ÷ 31.3oC, the ammonium utilization rate achieved 4.91 ÷ 5.85 mg N/L.h and nitrate production rate are 4.13 ÷ 5.08 mg N/L.h. Ammonium utilization and specific nitrate production rate reached 30.84 ÷ 37.83 mg N/g MLVSS.day (average 34.35) and 25.97 ÷ 32.57 mg N/g MLVSS.day (average 30.31) respectively