生物沸石床污水脱氮效果及机理  

Effect and Mechanism of Removal of Nitrogen in the Mimic Sewage Using Bio-zeolite System

作　　者：张曦[1] 吴为中[1] 温东辉[1] 唐孝炎[1] 

机构地区：[1]北京大学环境学院环境科学系,北京100871

出　　处：《环境科学》2003年第5期75-80,共6页Environmental Science

基　　金：科技部专项攻关课题 (K990 5 35 0 2 )

摘　　要：研究了生物沸石床对模拟村镇生活污水中各形态氮及COD等污染物的去除效果 .结果表明 ,生物沸石床对NH3 N去除效果明显且稳定 ,去除率大于 95 % ,对NO- 3 N的去除则受水力停留时间的影响较大 .从机理分析 ,生物沸石对NH3 N的去除主要依靠化学吸附、离子交换以及生物硝化的协同作用 ,而对NO- 3 N的去除主要依赖反硝化作用 .生物沸石的硝化作用明显 ,并受溶解氧浓度限制 ,沸石床中部沸石硝化强度只有表层沸石的 1 / 2 ;其反硝化能力则随实验条件中C/N的不同而变化明显 ,当COD/TN =5时 ,反硝化作用最强 ,在时间变化规律上 ,前6h反硝化速率最大 .On the spot, the removal effect of pollutants such as NH 3-N、NO - 3-N 、NO - 2-N、TN and COD in the mimic sewage by bio-zeolite system was studied. The following results were obtained: it was obvious and stable for the removal of NH 3-N by bio-zeolite with a removal efficiency over 95%, but the removal effect of NO - 3-N was affected deeply by hydraulic retention time, according to the different removal mechanism; chemical adsorption and ion exchange were the main reasons for the removal of NH 3-N as well as nitrification by microbe, while denitrification was the main reason for the removal of NO - 3-N. Nitrification intensity of bio-zeolite was affected by the concentration of dissolved oxygen in the solution, so the nitrification intensity of bio-zeolite on the surface of the zeolite bed was two times of that in the middle in vertical direction. Denitrification intensity changed with different values of C/N in the study, and it could reach the maximum while COD/TN was 5; as for denitrification velocity, it was largest in the first six hour.

关 键 词：生物沸石 化学吸附 离子交换 硝化 反硝化 

分 类 号：X799.3[环境科学与工程—环境工程]