Effect of Internal Recycle Ratio on the Phosphorus Removal Efficiency of Anaerobic/Anoxic/Oxic (A2/O) to Low Concentration of Organic Substance Wastewater

摘要

In the pilot-scale plant,the effect of internal recycle ratios (300％,200％,100％,and 0％) on the biological phosphorus removal was represented.The denitrifying phosphorus removal in anoxic tank was improved with low internal recycle,under the inhibition of high concentration of NOx-N.To low level strength wastewater (average COD 185.6 mg/L,average BOD 115.2 mg/L),the low level carbon source maintained the relatively steady phosphorus removal rates.