Research on the Effect of the Bypass Chemical Phosphorus Removal in A2/ O Process

In order to explore the impact of bypass chemical phosphorus removal on the effect of nitrogen and phosphorus removal of conventional A2/ O process, in this experiment, the pool of chemical removal of phosphorus is accessed at the end of anaerobic pool in the A2/ O process and adjust the pH value of pool to achieve phosphorus removal of purpose. Compared with the conventional A2/ O process the result shows that the average removal efficiency of TN is 69- 21% while the TN is 40 ~ 50 mg·L-1 in the intake of water and 11- 8 ~ 15- 5 mg·L-1 in the outlet of water, the average removal efficiency of TP is 90- 57% while the TP is 4- 2 ~ 8- 9 mg·L-1 in the intake and 0- 50 ~ 0- 75 mg·L-1 in the outlet. The removal efficiency of TN in modified A2 / O process is increased by 4- 04% and the TP is 2- 37%. This indicates that the modified A2 / O process has some improvements on the effect of nitrogen and phosphorus.