Effect of Different N/P Ratios on Integration and Simultaneous Denitrifying Nitrogen and Phosphorus Removal Process

摘要

This study was based upon the theory of simultaneous denitrifying nitrogen and phosphorus removal; laboratory-scale reactor had been designed with integrating concept,and realized continuous stable operation.The removal efficiency of nitrogen and phosphorus on this process was studied by synthetic municipal wastewater with COD between 250 mg/L and 350 rag/L,C/N between 5 and 8,and different N/P ratios.The results indicated that the removal rate of COD,ammonia nitrogen and total nitrogen reached 90％,98％ and 90％,respectively,but the removal rate of total phosphorus only reached 64％,when N/P ratios were between 5-8.Besides,when N/P ratios were between 8-10,the removal rate of COD,ammonia nitrogen,total phosphorus and total nitrogen reached 91％,98％,90％ and 90％,respectively,and the operation control was in the optimum status.However,when ratios between 10-14,the experimental effects show that removal rate of ammonia nitrogen,total phosphorus and total nitrogen reached only 80％,60％ and 52％,respectively,except for the removal rate of COD reached 92％.The basic data of the theory about simultaneous denitrifying nitrogen and phosphorus removal were accumulated and the practical engineering application of nitrogen and phosphorus removal process was discussed from the results of this study.