表面流人工湿地硝化和反硝化强度研究  

Nitrification and denitrification in surface flow wetland

作　　者：郑仁宏[1] 邓仕槐[1] 李远伟[1] 张小平[1] 李宏娟[1] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014

出　　处：《环境污染与防治》2007年第1期37-39,43,共4页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.30570062)。

摘　　要：通过对表面流人工湿地不同土壤层硝化反硝化强度的研究,探讨了表面流人工湿地脱氮过程中沿程硝化和反硝化作用的变化,以及不同C∶N对系统反硝化强度的影响。研究结果表明,系统可同时进行硝化和反硝化作用,硝化强度具有较明显的分层现象,表层土壤高于深层土壤。系统中沿程硝化强度呈递减趋势,硝化强度反映了氨氮去除率的大小,其去除率为68%。反硝化强度研究结果表明深层土壤的反硝化强度略高于表层土壤;沿程1/3至1/2段最大;5倍碳源时反硝化强度最高,3倍碳源次之,不加碳源最低;但系统的反硝化强度普遍较高,保持了良好的脱氮效果。Activities of nitrification and denitrification of different soil layers in a surface flow wetland were determined to monitor the progress of nitrification and denitrification and to illustrate the effect of C ： N ratio on denitrification. Nitrification and denitrification took place simultaneously in the wetland. Nitrification was most active in the upper layer （0- 10 cm below the surface） with activity declining gradually with depth. Denitrification was more active in the deeper layer （20-40 cm below） with the highest activity found in the 1/3 to 1/2 section of the wetland. Addition of a carbon source enhanced denitrification; the activity order was C ： N = 5 2〉 C ： N = 3 2〉 control without carbon supplementation. Employed for disposal of aerated domestic wastewater （COD= 131- 183 mg/L, TN = 48.05 - 52.47 mg/L and NH4^＋ -N= 8.71- 13.05 mg/L）, the wetland system accomplished stable treatment performance with 67%, 71% and 68% reductions in COD, TN and NH4^＋-N, respectively.

关 键 词：硝化/反硝化 表面流 人工湿地 土壤 

分 类 号：X703[环境科学与工程—环境工程]