水深对表面流人工湿地污染河水处理系统运行效果的影响

基于中试系统一年的连续运行监测,研究了水深对芦苇表面流人工湿地污染河水处理系统的影响。结果表明,水深对表面流人工湿地污染河水处理系统运行效果有很大影响,在进水COD、氨氮、总氮和总磷等分别为36±4.46、0.92±0.47、6.27±2.01和0.13±0.05 mg/L条件下,水深50 cm时处理效果最好,COD、氨氮、总氮和总磷去除率分别达到42.75%、58.42%、56.94%和43.24%。综合污染物去除效果和人工湿地建设工程量,芦苇表面流人工湿地的水深宜采用50 cm。人工湿地系统中植物光合生理和溶解氧等研究表明,水深主要通过影响植物生长和溶解氧等而影响人工湿地的水质净化效果。

Influence of depth on running effect of surface-flow constructed wetland treating polluted river water

Based on one year continuous operation monitoring of pilot system,the influence of depth on Phragmites australis surface-flow constructed wetland treating polluted river water was studied.The results showed that depth had a great impact on the treatment performance of constructed wetland.When COD,ammonia nitrogen,total nitrogen(TN),total phosphorus(TP) of influent were 36±4.46 mg/L,0.92±0.47 mg/L,6.27±2.01 mg/L,0.13±0.05 mg/L,respectively,the depth of 50 cm had the best treatment performance: COD,ammonia nitrogen,TN,TP removal rates reached 42.75%,58.42%,56.94%,43.24%,respectively.Considering pollutants removal and constructed wetland construction project quantity,surface-flow constructed wetland should adopt the depth of 50 cm.The study of the plant photosynthetic physiology and dissolved oxygen condition showed that depth affected water purifying ability by influencing the plant photosynthetic physiology and dissolved oxygen condition,etc.