农田排灌水的稳定塘-植物床复合系统处理

采用稳定塘-植物床系统处理农田排灌水,植物床栽植茭草和芦苇.监测结果表明,雨季、旱季平均流量分别为417.1,206.8m3/d,无降雨期间渗漏、蒸发蒸腾损失的水量之和占进水的42.1%～60.5%.系统雨季进水COD、总氮(TN)、氨氮和总磷(TP)平均浓度分别为97.9,8.09,3.38,0.69mg/L,旱季分别为112,7.76,3.78,0.98mg/L.各项污染物平均去除率大于57%.芦苇和茭草的生长速度在5月最大.因植物收割去除的N和P量分别占进水的14.6%和27.1%.从2002年4月~2003年7月湿地截留SS量为297.5m³.

Stabilization pond-plant bed composite system treatment of farmland irrigation and drainage water

The stabilization pond-plant bed composite system was used for treatment of farmland irrigation and drainage water, in the plant bed, Zizania caduciflora and Phragites austrails were planted. The average flow rates in rainy and dry seasons were 417.1 and 206.8m3/d. The sum of the infiltration and the evapotranspiration loss in period without rain occupied 42.1%~60.5% of the influent water. The chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen and total phosphorus (TP) average concentrations of the influent water in rainy and dry seasons were 97.9, 8.09, 3.38, 0.69mg/L and 112, 7.76, 3.78, 0.98mg/L, respectively. The average contaminant removal rate was more than 57%. The growth rates of Zizania caduciflora and Phragites austrails were greatest in May. The nitrogen and phosphorus amounts removed by plant harvesting occupied 14.6% and 27.1% of the influent water. The SS amount catched from April 2002 to July 2003 was 297.5m3.