复合地下渗滤床中污水脱氮效果及影响因素的研究

设有分水装置的复合地下渗滤对氮有较好的去除效果,当进水TN在28.34~50.82 mg/L时,系统对NH+3-N去除率为76.76%,TN去除率为64.33%。该系统内氨化菌、硝化菌、亚硝化菌等自养菌在各级渗滤床上部分布均匀且处于较高数量级(105~106 MPN/g),二级渗滤床内反硝化菌明显高于一级渗滤床,其数量106~107 MPN/g。各级渗滤床中氮转化菌分布和ORP测定结果表明该系统具有较好的硝化-反硝化环境条件,其中影响脱氮效果的主要因素是N/C和Nv。

Research on the Effect of Sewage Denitrification and Influencing Factors in the Complex Wetland System

Nitrogen can be well removed in the complex wetland system with water diversion devices. When TN is 28.34～50. 82 mg/1 in the inflow,the removal rate for NH3-N is 76.76 % and 64.33 % for TN. In this system,the autotrophic bacteria such as ammoniation bacteria, nitrifying bacteria and nitrosomonas are distributed evenly at all levels of the wetlands and are on high magnitude （ 105 ～ 106 MPN/g）. The quantity of denitrifying bacteria in the secondary wetland is 106 ～ 107 MPN/g, which is higher than that in the primary wetland. The distribution of nitrogen transforming bacteria at all levels of wetland and the result of oxidation-reduction potential （ORP） indicate that this system has good environmental conditions for nitrification-denitrification. N/C and Nv are an important factor to affect denitrification.