生物膜法同步硝化反硝化影响因素的分析

Study of factors affecting biofilm simultaneousnitrification and denitrification

研究了生物膜法同步硝化反硝化系统中曝气时间、溶解氧和进水COD负荷对COD及脱氮效率的影响 .研究结果表明 :在溶解氧浓度为 1.0～ 3.0mg/L范围内 ,随着反应器内溶解氧浓度的降低 ,总脱氮去除率提高 ,保持较好脱氮率的溶解氧浓度为 2 .0mg/L左右 ;在进水COD负荷为 0 .864～ 1.44 0kg/ (m3·d)范围内 ,保持较好脱氮率的最佳有机负荷为 1.15 2kg/ (m3·d) 。

The effect of aeration time,DO concentration and inlet COD loading on the COD and nitrogen removal efficiency in biofilm simultaneous nitrification and denitrification(SND)is studied.Results show that total nitrogen removal efficiency has a tendency to rise with the decrease of DO concentration between 1.0 mg/L and 3.0 mg/L in the reactor and the proper DO concentration is about 2.0 mg/L.The optimal organic loading which can reach the best nitrogen removal efficiency is 1.152 kg/(m 3·d) in the range of inlet COD loading from 0.864 kg/(m 3·d) to 1.440 kg/(m 3·d).The lower or higher organic loading may decrease the total nitrogen removal efficiency.