Nitrogen and phosphorus removal from polluted water using novel organic porous composite fillings biological system
基于新型有机多孔复合基质的生物系统去除污染水体中的氮磷

The aim of this study was to remove excessive nitrogen and phosphorus from polluted river water which flowed into Taihu Lake. Dynamic adsorption and biological methods were adopted to investigate the effect of N and P removal based on the novel organic porous composite fillings using sponge iron,zeolite,gravel and soil as stroma. The result showed that simultaneous nitrification and denitrification were achieved due to the existence of aerobic-anoxic microenvironment which was created in the novel organic porous composite fillings. In orthogonal test,it was proved that the optimal condition for N and P removal was reached when the flow rate was 0.00075 L/s,aeration duration was 24 h,pH=7 and aeration rate was 20 L/min. Elovich equations could accurately fit for describing absorption characteristic of three substrates (R2=0.81~0.92). Through optimal analysis of the average removal efficiency,the average NH3-N removal rate was 70.6%,TP removal rate was 81.2% under the aerobic conditions,and average rate of TN removal was 62.4%,COD removal rate was 42.6% under the anaerobic conditions. After treatment,the lowest concentration of NH3-N,TP,TN,COD were 0.75,0.095,1.1,18.3 mg/L, respectively. Considering removal of major pollutants and economic benefits,the new organic porous composite fillings combined with biological system was suitable for nitrogen and phosphorus removal from polluted water on Heyuan net region.