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

针对太湖入湖河道污染水体中的氮磷超标问题,以海绵铁、沸石、砾石和土壤为基质,采用动态吸附+生物法,对氮磷开展基于新型有机多孔复合填料的去除效果研究,结果表明,生物系统中的新型有机多孔复合基质在空间上形成了好氧-缺氧微环境,获得了较好的同步硝化-反硝化效果;通过正交实验确定流量0.00075 L/s,曝气时间24 h,pH值7,曝气量20 L/min为去除氮磷的最优条件;相对一级动力学方程、双常数方程而言,Elovich方程对3种填料的吸附动力学特征拟合最好,决定系数R2在0.81～0.92之间。通过平均去除效果较优分析,好氧条件下,NH3-N平均去除70.6%,TP平均去除81.2%;厌氧条件下,TN平均去除62.4%,COD平均去除42.6%;NH3-N、TP、TN和COD的最低浓度分别为0.75、0.095、1.1和18.3 mg/L,综合考虑主要污染物的去除效果和经济效益,本项新型有机多孔复合填料结合生物系统适宜去除河原平网地区污染水体中的氮磷。

Nitrogen and phosphorus removal from polluted water using novel organic porous composite fillings biological system

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.