摘要
选取昆明某人工湿地中的茭草、芦苇和水葫芦进行浸泡试验,考察因植物组织的溶解而导致的污染物释放规律.最快的释放发生在最初的24h内.COD的释放率小于TN和TP的释放率.芦苇的COD和TN释放速率最小,茭草的TP释放速率最小,茭草的COD释放速率最大,水葫芦的TN和TP释放速率最大.在停留时间为5d,水力负荷为8.7cm/d,TN、TP和COD负荷为1.52,0.11,13.7g/(m2?d)条件下,植物组织释放N、P、COD的量分别占去除负荷的29%,20%和38%.这表明对于进水负荷较低的人工湿地,收割植物可以改善湿地低效率时期的处理效率.
The soak test was made for Zizania caduciflora, Phragmites austrails and Eichhornia crassipes selecting from kunming certain of constructed wetland; the contaminants release rule induced by dissolution of plant＇s tissue was inspected. The quickest release happened within the first 24 hours. The release rate of COD was lower than that of total nitrogen （i.e. TN） and total phosphorus （TP）. The contaminants release rate was dependent on the plant species, i.e. Phragmites austrails had the least COD and TN release rate, Zizania caduciflor had the least TP release rate and the largest COD release rate, Eichhornia crassipes had the largest TN and TP release rates. Under the conditions of 5d residence time, 8.7cm/d hydrodynamic loading, TN, TP and COD loadings of 1.52, 0.11 and 13.7g/（m^2·d）. The amounts of N, P and COD released from the plant＇s tissue occupied 29%, 20% and 38% respectively of the removal load. In the constructed wetland of lower influent water load, the crop reaping was very necessary to improve the treatment efficiency of the wetland during the low efficiency period.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2005年第5期554-557,共4页
China Environmental Science
基金
国家重大科技专项"滇池流域面源污染控制研究"(2000-03)
关键词
污染物释放
茭草
芦苇
水葫芦
收割
contaminants release
Zizania caduciflora
Phragmites austrails
Eichhornia crassipes
harvest
